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Sample records for anticuerpos igg al

  1. Prevalencia de anticuerpos IgG al toxoide tetánico en trabajadores sanitarios

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    B. Pérez Bermúdez

    2014-09-01

    Full Text Available Introducción: En el año 2009 el Ministerio de Sanidad y Consumo de España publica una nueva guía para la vacunación de la Difteria y Tétanos. Existen discrepancias con los tiempos de inoculación de las dosis de recuerdo con otros países y sociedades médicas. Material y métodos: Estudio descriptivo. Las variables analizadas fueron: IgG-Toxoide Tetánico, tiempo última dosis de vacunación, dosis totales, edad, sexo, hospital, habito tabáquico e índice de masa corporal. Se construyó un modelo de Regresión Logística. Con el fin de determinar los puntos de corte más sensibles y específicos para las variables temporales (tiempo desde la última dosis y edad se calcularon las curvas R.O.C Resultados: Las variables, edad O,R= 17,56 (1,840 - 167,760, dosis de vacuna inoculadas al trabajador, O,R= 0,064 (0,006 - 0,908 y tiempo de la última dosis de vacunación, O,R= 1,03 (1,017 - 1,047, son las variables significativas en el análisis multivariante. Los puntos de cortes, para la edad son 54 años (Sensibilidad S= 0,72, Especificidad SP=0,77 y 15 años tras la última dosis años (S= 0,88, SP=0,86, por encima de este corte la probabilidad de no tener anticuerpos al Tétanos es alta. Conclusiones: Ante un trabajador que refiere o documenta que hace más de 15 años de la ultima dosis deberíamos plantearnos la revacunación, si además este trabajador refiere no tener más de 5 dosis inoculadas y tiene más de 54 años la revacunación sería muy recomendable.

  2. Determinación de IgG y anticuerpos totales contra el Virus Dengue, en muestras obtenidas en papel filtro

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    María García

    1997-01-01

    Full Text Available Se propone como alternativa para la determinación de anticuerpos contra el virus del dengue, el uso de muestras de sangre total obtenidos en papel filtro, por ser un método sencillo y no requerir de muchos cuidados en el envío al laboratorio. Se evaluaron 100 muestras de suero obtenidas en tubos al vacío y sangre total en papel filtro respectivamente, de pacientes con diagnóstico clínico de Dengue clásico. Ambas muestras fueron evaluadas con los métodos serológicos de ELISA Indirecta para detectar IgG e Inhibición de la Hemoaglutinación para detectar anticuerpos totales. Por ELISA indirecta se obtuvo un total de 51 positivos y 49 negativos en suero; 45 positivos y 48 negativos en papel filtro, con una concordancia por índice Kappa de 0.92, sensibilidad de 88% y especificidad de 98%. Por Inhibición de la Hemaglutinación se obtuvo un total de 45 positivos y 55 negativos en suero; 40 positivos y 50 negativos en papel filtro, con una concordancia por índice Kappa de 0,88, sensibilidad de 87% y especificidad de 91%.

  3. Prevalencia de anticuerpos IgG específicos dirigidos a Mycobacterium avium en caprinos y ovinos en el sur de la Guajira y norte del Cesar

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    María Fernanda Cepeda

    2016-06-01

    enviados para su procesamiento al Laboratorio de Investigaciones Biomédicas y Biotecnológicas (LIBB del programa de Bacteriología y Laboratorio Clínico de la Universidad de Santander UDES Bucaramanga. Los resultados del procesamiento de las pruebas de ELISA serán ingresados en una base de datos proporcionada por la institución responsable del control de calidad de pruebas, Laboratorios VECOL, para su posterior análisis. El análisis estadístico será realizado mediante la aplicación del paquete estadístico Graphpad Prism (La Jolla, CA, USA. Resultados: Como resultado de este trabajo se plantea la determinación de la prevalencia de anticuerpos específicos de tipo IgG dirigidos a M. avium en caprinos y ovinos, información que aportará herramientas encaminadas a la construcción de un perfil sanitario en los municipios del sur de la Guajira y el Norte del Cesar. Conclusiones: El conocimiento de la prevalencia de M. avium en ovinos y caprinos de la región del sur de la Guajira y el norte del Cesar, se concibe como un aspecto de importancia epidemiológica al ser considerada una infección de notificación obligatoria según la Organización Mundial de Sanidad Animal (OIE según su sigla en inglés dado que estos departamentos encabezan el listado de las regiones con mayor actividad económica basada en la producción y consumo de estos animales y sus productos, adicionalmente, los ovinos y caprinos tienen la capacidad de ser reservorios para este agente infeccioso, llegando a convertirse en potencial causa del desarrollo de enfermedades en estas poblaciones específicas, así como, la importancia que pueden representar desde el punto de vista de su potencial zoonótico.

  4. Aplicación de una biblioteca de anticuerpos lineales humanos frente al polisacárido capsular de Neisseria meningitidis serogrupo B

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    Emigdio León-Toirac

    2013-12-01

    Full Text Available Neisseria meningitidis serogrupo B produce aún morbimortalidad significativa. Su polisacárido capsular muestra similitud estructural con proteínas humanas y pobre inmunogenicidad, obstaculizando así el desarrollo de vacunas y anticuerpos monoclonales (AcM y policlonales contra esta bacteria. Recientemente se han creado bibliotecas artificiales de anticuerpos humanos expresados en bacteriófagos que reconocen específicamente a moléculas diana existentes, con la ventaja sobre los AcM convencionales por su rápida obtención, sin utilización de animales de laboratorio, lo que emerge como alternativa atractiva para la producción de AcM contra antígenos peculiares o complejos. Se realizó un trabajo de investigación básica, utilizando una biblioteca de fagos filamentosos que expresan constitutivamente regiones variables de anticuerpos humanos, que se enfrentó al polisacárido capsular de N. meningitidis serogrupo B. Los resultados que se obtuvieron mediante ELISA policlonal sugieren la existencia de anticuerpos humanos expresados en fagos que lo reconocen.

  5. Rabbit IgG antibodies against Phospholipase A2 from Crotalus durissus terrificus neutralize the lethal activity of the venom Los anticuerpos IgG de conejos anti-fosfolipasa A2 de Crotalus durissus terrificus neutralizan la actividad letal del veneno

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    Juan P. Rodríguez

    2006-12-01

    Full Text Available Crotalus durissus terrificus (C.d.t. (South American rattlesnake venom possesses myotoxic and neurotoxic activities, both of which are also expressed by crotoxin, the principal toxin of this venom. Crotoxin contains a basic phospholipase A2 (PLA2 and a non toxic acidic protein, crotapotin. We have produced and investigated the ability of IgG antibodies raised in rabbits against PLA2 to neutralize the lethality of the whole venom. PLA2 was isolated by gel filtration chromatography (Sephadex G-75. Specific antibodies were obtained by subcutaneous and intramuscular inoculation of PLA2 (700 µg with Freund adjuvant. Groups of six mice (20 + 2 g were inoculated with 0.5 ml i.p. of C. d. t. venom (4 µg or a mixture of venom that had been preincubated with the desired volume of IgG antibodies. Mortality, recorded 24 and 48 h after inoculation, showed that IgG anti-PLA2 were more effective than anticrotalic serum in neutralizing the lethal activity. These results demonstrate that it could be possible to obtain an anti-venom made by specific antibodies with a high level of protection against the lethal component of C.d.t. venom, and/or the inclusion of these antibodies as a supplement in heterologous anti-venoms.El veneno de Crotalus durissus terrificus (C.d.t. (Cascabel de Sud América posee actividad miotóxica y neurotóxica, actividades que también exhibe el complejo crotoxina, principal componente tóxico de este veneno. El complejo crotoxina está constituido por una fosfolipasa A2 básica (PLA2 y una proteína acídica no tóxica, el crotapotín. En este trabajo se estudió la capacidad neutralizante de anticuerpos IgG anti-PLA2 sobre la letalidad inducida por el veneno entero. El antígeno PLA2, fue aislado por cromatografía de filtración en gel (Sephadex G-75. Se inocularon conejos machos por vía subcutánea e intramuscular, con 700 µg de PLA2 y adyuvante para la obtención de anticuerpos específicos. La capacidad neutralizante del

  6. Determinación de las condiciones de ensayo óptimas en un ELISA para la detección de anticuerpos séricos IgG anti-LPS de Pseudomonas aeruginosa O11

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    Tania Valmaseda

    2004-12-01

    Full Text Available La selección de sueros de donantes sanos para la obtención de una gamma hiperinmune contra la infección por Pseudomona aeruginosa, así como la evaluación de la respuesta inmunológica de cualquier candidato vacunal contra este microorganismo necesita contar en el laboratorio con técnicas estandarizadas. En este trabajo se realizaron los ensayos necesarios para el montaje y la optimización de un ELISA indirecto para la determinación de anticuerpos séricos de clase IgG anti- LPS de P. aeruginosa O11. Se evaluaron la concentración de recubrimiento, condiciones de bloqueo, dilución de trabajo de las muestras a evaluar y del conjugado con el fin de seleccionar en cada caso las mejores respuestas para el control positivo, el control negativo y el blanco del ensayo. Una concentración de 1,5 μg/mL de LPS O11 en PBS toda la noche a 4 °C como recubrimiento, la necesidad de no incluir un paso adicional de bloqueo y el conjugado humano anti IgG-HRP diluido 1:3000, 1 h a 37 °C resultaron las variables óptimas para el ensayo. Por otra parte, se estableció el rango lineal de la curva del control positivo y se seleccionó la dilución de trabajo 1:100 para las muestras de sueros a evaluar.

  7. Obtención de un conjugado anti IgG de ratón - FITC mediante la tecnología IgY para uso como anticuerpo secundario en la detección de antígenos de superficie celular

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    Esteban J. Gutiérrez Calzado

    2007-01-01

    Full Text Available Desde el año 1996, el Centro Europeo para la Validación de Métodos Alternativos recomendó el uso de la IgY como sustituto de la IgG de mamíferos con el objetivo de reducir al mínimo las situaciones de daño que se les causa a los animales que se someten a la producción de anticuerpos (Acs. En 1999, la tecnología IgY se aprobó por la Oficina Federal Veterinaria del gobierno suizo como un método alternativo para sustentar el cuidado y bienestar de los animales. Muchas de las publicaciones relacionadas con IgY demuestran las características desde el punto de vista bioquímico de esta inmunoglobulina que la hace tomar ventajas sobre la IgG, entre las que refiere que los complejos inmunes que contienen Acs aviares, no pueden interactuar con los receptores Fc o del complemento sobre las células, por lo que el reemplazamiento de los Acs de mamíferos por sus similares en gallinas pudieran evitar interferencias en muchos ensayos diagnósticos. Este conocimiento ha sido la base objetiva de este trabajo que consistió en la obtención de Acs IgY anti IgG de ratón con elevado grado de pureza, los que fueron conjugados por unión covalente vía grupos amino primarios libres al isotiocianato de fluoresceína (FITC. Estos conjugados mostraron poseer una razón molar FITC/proteína en intervalos reportados para un buen desempeño. La dilución óptima de trabajo obtenida para ellos fue muy adecuada y demostró su utilidad como Acs secundarios en el conteo de antígenos de superficie celular linfocitario humano por sus resultados comparables con los reactivos similares de origen mamífero ensayados en paralelo.

  8. Anti-tissue transglutaminase antibodies (IgA and IgG in both Crohn's disease and autoimmune diabetes Anticuerpos (IgA e IgG antitransglutaminasa tisular en la enfermedad de Crohn y diabetes autoinmune

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    Virgínia Lúcia Ribeiro-Cabral

    2011-09-01

    Full Text Available Objective: a strong association has been observed between celiac disease, generally its silent clinical form, and autoimmune disorders. A potential correlation with inflammatory bowel disease has also been suggested. Anti-tissue transglutaminase antibodies have been detected in Crohn's disease. We investigated the prevalence of celiac disease in patients with autoimmune diabetes and in Crohn's disease patients and also evaluated the correlation between anti-transglutaminase antibody positivity and the clinical status of these diseases. Methods: anti-tissue transglutaminase and anti-endomysium antibodies were assessed by enzyme-linked immunosorbent assay and indirect immunofluorescence, respectively. Upper digestive endoscopy and duodenal biopsy were indicated for cases with positive serology. Results: anti-transglutaminase antibodies were detected in five diabetic patients (prevalence of 11.1%, only one serum sample was positive for IgG isotypes. Nine of thirty-three patients with Crohn's disease had low positive levels for IgA anti-transglutaminase. Anti-endomysium antibodies were detected only in celiac patients. Celiac disease was confirmed in all diabetic patients submitted to duodenal biopsies who presented both anti-transglutaminase and anti-endomisyum antibodies positivity. In Crohn's disease, its clinical status and the diagnosis of celiac disease were not associated with positive anti-transglutaminase result. Conclusions: the prevalence of celiac disease was high in diabetic patients. Anti-tissue transglutaminase antibodies were sensitive and specific markers of celiac disease in this diabetic group, while these antibodies were of limited value for celiac disease screening in patients with Crohn's disease.

  9. Obtención de anticuerpos monoclonales de ratón contra proteasa de cisteína 5 recombinante de Entamoeba histolytica

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    Juanita Trejos S.

    2012-08-01

    Full Text Available Objetivo. Obtener anticuerpos monoclonales de ratón contra la proteasas de cisteína 5 (EhCP5 de Entamoeba histolytica. Materiales y métodos. Se inmunizaron ratones BALB/c por vía intraperitoneal con adyuvante de Freund completo e incompleto con la proteína recombinante EhCP5 obtenida a partir del cultivo de E.coli DH5α trasfectada con el vector recombinante pJC45 que expresa dicha proteína. Se seleccionó el animal con mejor respuesta de anticuerpos. Al cual se le extrajo su bazo como fuente de linfocitos B, los cuales se fusionaron utilizando PEG con células de mieloma de ratón SP2-0/Ag14. Se procedió a selección de los hibridomas y a la evaluación de los sobrenadantes de las colonias que crecieron a los 7 días mediante ELISA. Los hibridomas con valores más altos de anticuerpos específicos contra la proteína EhCP5r se seleccionaron, y los clones obtenidos por diluciones limitantes fueron expandidos. Resultados. A partir de un clon secretor estable se purifico el anticuerpo monoclonal anti EhCP5r del isotipo IgG1 por cromatografía de afinidad con proteína G. Los clones fueron expandidos in vivo e in vitro. Con el anticuerpo purificado se diseñaron tres sistemas de captura para evaluar la aplicabilidad del anticuerpo monoclonal anti EhCP5r como método inmunodiagnóstico. Conclusiones. Se logro la producción de un anticuerpo monoclonal específico contra EhCP5r que permite diferenciar Entamoeba histolytica de Entamoeba dispar.

  10. Haptenos, conjugados y anticuerpos para el fungicida pirimetanil

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    Mercader Badia, Josep Vicent; Abad Fuentes, Antonio; Abad Somovilla, Antonio; Agulló, Consuelo

    2012-01-01

    [ES] La presente invención se refiere a haptenos, conjugados, derivados marcados y anticuerpos para pirimetanil. Así mismo, la presente invención también se refiere al uso de los derivados marcados de pirimetanil como antígenos de ensayo o inmunógenos para obtener anticuerpos de este fungicida; y al uso de los derivados marcados de pirimetanil como antígenos de ensayo. Además, la presente invención también se refiere a un método de análisis de pirimetanil utilizando los anticuerpos obtenidos,...

  11. Haptenos, conjugados y anticuerpos para el fungicida pirimetanil

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    Mercader Badia, Josep Vicent; Abad Fuentes, Antonio; Abad Somovilla, Antonio; Agulló, Consuelo

    2012-01-01

    La presente invención se refiere a haptenos, conjugados, derivados marcados y anticuerpos para pirimetanil. Así mismo, la presente invención también se refiere al uso de conjugados de pirimetanil como antígenos de ensayo o inmunógenos para obtener anticuerpos de este fungicida; y al uso de los derivados marcados de pirimetanil como antígenos de ensayo. Además, la presente invención también se refiere a un método de análisis de pirimetanil utilizando los anticuerpos obtenidos, en ocasiones jun...

  12. Seroprevalencia de anticuerpos bactericidas frente al meningococo C en Cantabria 10 meses tras la campaña de vacunación

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    Aledo Linos Alvaro Gonzalez de

    1998-01-01

    Full Text Available FUNDAMENTO: En febrero-marzo de 1997 se realizó en Cantabria (Comunidad Autónoma del Estado Español con 541.885 habitantes, de los cuales 107.787 tienen una edad entre 18 meses y 19 años una campaña de vacunación antimeningocócica dirigida a niños entre 18 meses y 19 años, que abarcó a todos sus municipios y alcanzó una cobertura mayor del 95%. En los 12 meses posteriores la eficacia vacunal fue del 95.68% en todas las edades. Para ayudar a decidir una revacunación se realizó un estudio de seroprevalencia de anticuerpos bactericidas en la población vacunada. MÉTODOS: en diciembre de 1997 se analizaron muestras de sangre de 414 niños vacunados, obtenidas al azar de extracciones oportunistas realizadas en Atención Primaria y en Hospitales Públicos de la Comunidad, y de niños escolarizados en las guarderías públicas dependientes de la Dirección General de Bienestar Social de Cantabria. Se analizó la tasa de anticuerpos bactericidas en el Centro Nacional de Microbiología, estableciéndose el nivel de "efecto vacunal" en la dilución 1/8. RESULTADOS: se obtuvieron los siguientes porcentajes de títulos > o = 1/8 (entre paréntesis, grupos de edad al vacunarse: 0% (18-24 meses, 4% (1.5 a 4 años, 7.1% (1.5 a 6 años, 51.3% (6 a 12 años y 81.2% (12 a 19 años. Debido a que la definición de "efecto vacunal" se cifró en la dilución 1/8 de forma artificial, y a que otros trabajos la cifran en 1/4, en 287 sueros con resultado <1/8 se repitió el ensayo bactericida con la dilución 1/4, resultando que 286 (el 99.6% también dieron negativo. Es decir, que el resultado final no variaría si situásemos el punto de corte en la dilución 1/4 en vez de en 1/8. No se encontraron diferencias significativas según la procedencia de municipios donde hubiera habido casos de meningitis C o no los hubiera habido. CONCLUSIONES: la actividad bactericida es muy baja en los menores de 4-6 años, inferior a lo publicado, y mayor por encima de esa

  13. Prevalencia de anticuerpos anti envoltura nuclear y sus isotipos en sueros positivos para anticuerpos antinucleares Prevalence of antinuclear envelope antibodies and their isotypes in sera positive for antinuclear antibodies

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    Miriam Arcavi

    2006-08-01

    Full Text Available Los anticuerpos antinucleares detectados por inmunofluorescencia indirecta en células HEp-2 presentan una gran variedad de imágenes, entre ellas el patrón de envoltura nuclear que suele ser un hallazgo poco frecuente. Se procesaron 2594 sueros en los cuales se detectó un 37.6% de anticuerpos antinucleares. La prevalencia de anticuerpos anti-envoltura nuclear (ANEA fue del 1.2% presentando una alta asociación con hepatopatías autoinmunes (83% y baja con lupus eritematoso sistémico. En los 21 sueros de los pacientes que presentaron ANEA no se detectaron anticuerpos anti-ADNn hallándose 28.6% de anticuerpos anti-músculo liso y 19% de anticuerpos anti-mitocondriales. El corte triple de tejido de rata mostró ser un sustrato menos sensible que HEp-2 para la detección de ANEA. Al utilizar conjugados dirigidos contra diferentes isotipos de anticuerpos para la detección de ANEA, se encontró: 90.5% de IgG, 66.6% de IgA y 9.5% de IgM. Dos de los pacientes presentaron ANEA-IgA a altos títulos (³1:160 en ausencia de ANEA-IgG. En este trabajo se destaca la importancia de realizar pruebas complementarias que detecten anticuerpos anti-músculo liso, anti-mitocondriales y anti-ADNn, para orientar el diagnóstico clínico de los pacientes que presentan ANEA. Además, sostiene la postura de utilizar como conjugado para IFI-HEp2 anticuerpos anti-inmunoglobulinas totales en lugar de anti-IgG hasta tanto se clarifique el rol que juegan los anticuerpos IgA en estas enfermedades autoimunes.Antinuclear antibodies detected in HEp-2 cells by indirect immunofluorescence assay display a great variety of images, including the nuclear envelope pattern. This is quite a less frequent finding. Two thousand five hundred and ninety-four sera were processed, and 37.6% of ANA were detected. The prevalence of anti-nuclear envelope antibodies (ANEA was of 1.2%, with a high association with autoimmune liver diseases (83% and a low association with systemic lupus

  14. Antisperm autoantibodies and infertility Anticuerpos antiespermatozoides e infertilidad

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    Jorge Eliécer Ossa Londoño

    1997-02-01

    Full Text Available Fourteen human infertile couples were studied along with seven fertile control couples in order to determine the presence of antisperm au. toantibodies and to correlate results with their clinical reproductive status, spermogram parameters and the quality of cervical mucus. Immunoglobulins of IgG and IgA isotypes were evaluated on spermatozoa by the direct immunobead technique and in serum and cervical mucus by the indirect method. The following differences were found: Nine of 14 male patients but only 1 of 7 male controls had IgG on spermatozoa (p= 0.042 and OR= 10.8. Seven out of 14 male patiens and 1 of 7 controls were positive for IgA on spermatozoa (p= 0.12. Infertile males had a higher frequency of abnormal spermogram parameters as compared to controls (p= 0.0029 and OR= 3.32. Interestingly, the presence of only IgG in serum appeared to be a "protective factor" against IgG on sperm; only one out of the 16 positive males contradicted this observation. Para determinar la presencia de anticuerpos antiespermatozoides y correlacionarla con la situación reproductiva, el espermograma y la calidad del moco cervical, se estudiaron 7 parejas sanas, con hijos, y 14 infértiles. Se determinaron por las técnicas directa e indirecta de inmunoesferas los anticuerpos de los isotipos IgG e IgA en espermatozoides, suero y moco cervical. En 9 de los 14 hombres infértiles y en 1 de los 7 fértiles se encontraron anticuerpos IgG en la superficie de los espermatozoides (p= 0.042 y una Razón de disparidad [RD] = 10.8 y 8 de éstos también tuvieron IgA en los espermatozoides. El número de pruebas alteradas en el espermograma de los hombres infértiles fue significativamente mayor (p= 0.0029 y RD = 3.32. Tanto en los hombres infértiles como en los fértiles la presencia de sólo IgG en el suero parece ser un "factor de protección" contra IgG en los espermatozoides; de los 16 hombres que presentaron anticuerpos, fuera en el suero o en los espermatozoides, s

  15. Desarrollo de un Sistema ELISA para cuantificar IgG de ratón tomando como base la tecnología IgY

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    Esteban J. Gutiérrez Calzado

    2007-01-01

    Full Text Available Se conoce que desde 1893, se había descrito un experimento en el que se demostraba que en el proceso de inmunización de gallinas, el resultado consistía en la transferencia de anticuerpos específicos hacia la yema de sus huevos. Tomando como base este conocimiento, este trabajo se enfocó en demostrar que los anticuerpos de yema de huevo obtenidos a partir de gallinas inmunizadas con una preparación comercial de IgG de ratón pueden constituir una alternativa a sus similares en mamíferos al conjugarse con la enzima peroxidasa y utilizarse como reactivos en técnicas ELISA para la determinación de anticuerpos monoclonales murinos del tipo IgG. Para esto, se desarrollaron esquemas de inmunización en paralelo en gallinas y conejos a los que se les aplicaron diversas dosis del antígeno (IgG de ratón demostrándose que las gallinas son capaces de brindar títulos de anticuerpos aunque menores que en el conejo, sí razonables en sus yemas de huevo contra este antígeno, útiles para procesos posteriores. Se demuestra que el método del m-peryodato de sodio es aplicable a los anticuerpos de yema de huevo (IgY para conjugarlos a la enzima peroxidasa para su uso exitoso en inmunoensayos como el ELISA. El Sistema ELISA desarrollado sobre la base de los anticuerpos IgY mostró en su desempeño algunas ventajas a su similar desarrollado con conjugado de anticuerpos de mamíferos. Este trabajo demuestra que la obtención de anticuerpos IgY en este caso, es una fórmula que reduce los costos de producción de conjugados enzimáticos al menos tres veces, lo que conjuntamente con los elementos bioéticos la convierte en una vía atractiva para complementar los procesos tradicionales de producción de anticuerpos.

  16. Relationships of systemic IgG antibody response and lesions caused by Oestrus ovis L. larvae (Diptera: Oestridae in infected goats - Interacciones de la respuesta sistémica de anticuerpos IgG y las lesiones causadas por larvas de Oestrus ovis L. (Diptera: Oestridae en cabras infectadas

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    Angulo-Valadez, Carlos E

    2009-11-01

    la glándula salival para elserodiagnóstico de la estrosis caprina usando la prueba de ELISA. Secapturaron larvas de tercer estadio (L3, se disectaron para removerla glándula salival y obtener la fuente de antígenos (CGS. Seexaminaron en necropsias 250 cabras. El peso, sexo y edad fueronregistrados. Los senos frontales y cavidades cornuales se examinaronpara la presencia de O. ovis. La intensidad de las lesiones en cabrasinfectadas (n=38 se registraron de acuerdo con una tabla deseveridad. Los sueros (n=125 se analizaron por ELISA para detectarla respuesta humoral de IgG. La prevalencia anual de la estrosiscaprina fue 73.9%. Una asociación baja positiva (r=0.38, P<0.05 seobservó entre la carga larvaria y la severidad de las lesionesencontradas. En general, se observaron alta sensibilidad (90.82% ybaja especificidad (25.93% en la prueba de ELISA. Comoconclusiones, los daños patológicos mayores se asociaron al númeroy presencia de larvas tempranas L2 y L3, probablemente inducidospor la muda larvaria. Los antígenos CGS demostraron ser valiosos enla prueba de ELISA para el diagnóstico de la estrosis caprina.

  17. Estudio del perfil de anticuerpos contra Helicobacter pylori producidos por pacientes con diferentes patologías gastroduodenales

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    Spinel Clara

    2004-12-01

    Full Text Available La colonización de la mucosa gástrica con Helicobacter pylori causa la infección bacteriana más frecuente a nivel mundial que es la mayor causa de enfermedades gastrointestinales en humanos. Con el objetivo de examinar el reconocimiento de antígenos de dos cepas de la bacteria en
    150 pacientes infectados y con inflamación (30 de gastritis crónica no atrófica G, úlcera duodenal (30 UD, patologías preneoplásicas (30 de gastritis atrófica GA y 30 de metaplasia intestinal MI y adenocarcinoma gástrico (30 C, se realizó un sistema de cultivo de Helicobacter pylori
    con células epiteliales gástricas. Los sobrenadantes de estos cocultivos fueron empleados como preparación antigénica en pruebas de inmunotransferencia, en las que se detectaron los anticuerpos
    IgG totales, al igual que sus cuatro subclases (IgG1, IgG2, IgG23, IgG4 en los sueros de los pacientes. Se encontró que los perfiles antigénicos de las dos cepas de Helicobacter pylori, aisladas de un paciente con úlcera duodenal y uno con adenocarcinoma gástrico, eran semejantes, con 23 proteínas comunes que incluían los principales factores de virulencia de la bacteria (CagA, VacA, Ureasa, Flagelina. Aunque los sueros mostraron un reconocimiento variado de cada uno de los antígenos, no se encontraron diferencias entre el número de antígenos reconocidos según la patología ni la cepa, tanto para las IgG totales (p = 0,98, como cada una de las subclases (IgG1:p = 0,97; IgG2: p = 0,72; IgG3: p = 0,61; IgG4: p = 0,84. Con el fin de analizar simultáneamente la respuesta de los pacientes hacia el total de los 23 antígenos, se aplicaron análisis multivariados gracias a los cuales se distinguieron cuatro proteínas, de 70,
    82, 90 kDa y VacA de 86 kDa como los principales antígenos implicados en la respuesta inmune de las personas infectadas. Adicionalmente, se diferenciaron dos grupos de patologías según el reconocimiento del conjunto de antígenos: por

  18. Anticuerpos antinucleares, imágenes y características obtenidas por inmunofluorescencia: Importancia de los isotipos IgA, IgM e IgG Antinuclear antibodies, patterns and characteristics obtained by immunofluorescence: The importance of the IgA, IgM and IgG isotypes

    Directory of Open Access Journals (Sweden)

    Miriam Arcavi

    2009-10-01

    Full Text Available La técnica de elección para el screening de anticuerpos antinucleares (ANA es la inmunofluorescencia indirecta que utiliza como sustrato una línea de células epiteliales de carcinoma de laringe humano (IFI-HEp2, y como antisuero, anti-IgG o anti-Ig totales. Los ANA-IgG son los más importantes para el diagnóstico y monitoreo de las enfermedades del tejido conectivo (ETC, mientras los ANA-IgM son de menor relevancia clínica en estos pacientes. Sin embargo, poco se sabe de los ANA-IgA ya que estos Ac han sido menos investigados. El objetivo de este trabajo fue estudiar la prevalencia de los diferentes isotipos de inmunoglobulinas de anticuerpos antinucleares en los pacientes con ETC y evaluar la conveniencia de utilizar conjugados monovalentes o polivalentes. Se procesaron 100 sueros de pacientes con diversas ETC empleando IFI-HEp2, en los cuales se detectó 38% de ANA-IgA (títulos ≥ 1:80 y 12% de ANA-IgM (títulos ≤ 1:160. En 29 casos se detectó IgA en ausencia de IgM, en 3 casos IgM en ausencia de IgA. En todos los casos los ANA-IgG estuvieron presentes. En 6 sueros se observó un cambio de imagen con conjugado anti-IgA y en 3 con conjugado anti-IgM. Debido a la alta prevalencia de ANA-IgA detectada por IFI-HEp2, se destaca la conveniencia de utilizar conjugado anti-Ig totales en lugar de anti-IgG, mientras se desconozca la relevancia de los ANA-IgA en el diagnóstico, pronóstico y seguimiento de las enfermedades reumáticas sistémicas.The indirect immunofluorescence with epitelial cell line from human laryngeal carcinoma as substrate (IIF-HEp2 and anti-IgG or anti-total Ig as antisera, is the technique currently used for the detection of antinuclear antibodies. The most important antibodies for the diagnosis and follow-up of connective tissue diseases (CTD are the IgG-ANA, while the IgM-ANA have no clinical relevance. However the IgA-ANA have not been thoroughly investigated so far. The aim of this work was to study the prevalence

  19. Prevalencia de anticuerpos neutralizantes contra los serotipos del virus dengue en universitarios de Tabasco, México Prevalence of neutralizing antibodies to dengue virus serotypes in university students from Tabasco, Mexico

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    Gilma Guadalupe Sánchez-Burgos

    2008-10-01

    Full Text Available OBJETIVO: Determinar la seroprevalencia de anticuerpos neutralizantes de los serotipos del virus dengue en estudiantes universitarios de Tabasco, México, durante los meses de septiembre a noviembre del año 2005. MATERIAL Y MÉTODOS: Se determinó la presencia de IgG contra el virus en el suero de estudiantes que acudieron al centro clínico de la universidad; en los sueros positivos se determinaron los anticuerpos neutralizantes mediante el ensayo de reducción de placa lítica. RESULTADOS: La prevalencia de IgG contra el dengue fue de 9.1%; de esta proporción, los anticuerpos neutralizantes fueron DENV-1 (20%, DENV-2 (100%, DENV-3 (4% y DENV-4 (68%. CONCLUSIONES: Este estudio muestra que el serotipo transmitido con mayor frecuencia en el estado de Tabasco es el DENV-2, aunque no ha sido el aislado con más frecuencia. La elevada prevalencia de anticuerpos neutralizantes contra el DENV-4, al parecer de reacción cruzada, podría explicar la baja circulación de este serotipo en Tabasco.OBJECTIVE: Determine the seroprevalence of neutralizing antibodies to dengue virus in students from the state university of Tabasco, Mexico. MATERIAL AND METHODS: A transversal study was conducted of serum collected from students between September and November, 2005. The sera were screened for anti-dengue IgG and those that had evidence of dengue antibodies were analyzed by a plaque reduction neutralization test. RESULTS: Prevalence of anti-dengue IgG was 9.1%. The frequency of neutralizing antibodies was 100% for DENV-2, 68% for DENV-4, 20% for DENV-1, and 4 % for DENV-3. CONCLUSIONS: We found that in this population, DENV-2 circulates more than DENV-3 despite the fact that DENV-3 is more frequently isolated. Unexpectedly, neutralizing antibodies against DENV-4 were frequently found even though this serotype is almost extinct; thus, it is probable that cross-immunity could suppress DEN-4 transmission, as has been suggested.

  20. Frecuencia de anticuerpos anti Toxoplasma gondii en gestantes de Cúcuta, Colombia

    OpenAIRE

    Cárdenas, Denny; Lozano, Claudia; Castillo, Zaida; Cedeño, Jessenia; Galvis, Viannis; Rios, Jessica; Tórres, Madalhene

    2016-01-01

    La toxoplasmosis es una infección ocasionada por Toxoplasma gondii, peligrosa durante la gestación. La presencia de anticuerpos IgG específicos implica contacto previo individuo-parásito, mientras que la detección de IgM anti-T. gondii, es considerada marcador de infección aguda, fase en la que se incrementa además el título IgG. Objetivo: Determinar la frecuencia y título de anticuerpos contra Toxoplasma gondii en gestantes. Material y métodos: Estudio transversal, se determinó el título de ...

  1. Asma y deficiencia de subclases de IgG Asthma and IgG subclases deficiency

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    Lucía Santamaría Ortiz

    1995-04-01

    Full Text Available

    Se estudiaron 45 pacientes asmáticos adultos de difícil manejo, de más de 5 años de evolución, 37 de ellos esteroide dependientes y 8 no dependientes, con asma alérgica o intrínseca y algunos con Infecciones respiratorias recurrentes de predominio viral. Por nefelometría se midieron los niveles séricos de las IgsG, M y A, y por ELISA se determinó la IgE total. Se encontraron 4 pacientes con deficiencia de IgG total, en el grupo de los esteroide dependientes. Mediante ELISA tipo sandwich y con anticuerpos monoclonales específicos para las sub clases de IgG se investigaron los niveles sé ricos de IgG1, 2, 3 y 4. En el 55.6% de los enfermos se encontraron una O más deficiencias de sub clases. No hubo diferencias significativas entre los grupos esteroide y no esteroide dependientes, ni entre los asmáticos alérgicos e intrínsecos, ni entre los con infección recurrente o sin ella. predominó la deficiencia de IgG1; en total el 46.7% de los pacientes tenían deficiencia aislada o combinada de IgG1, el 31.1% de IgG2, el 24.4% de IgG3 y el 17.8% de Igd4. La alta incidencia de deficiencia de sub clases podría deberse a la acción de los esteroides o a una alteración en la regulación de la síntesis de Igs producida por un defecto Inmune primario. Esta deficiencia sería la responsable del comportamiento agresivo de la enfermedad.

    We studied 45 adult asthmatic patients with difficult to care disease and who had more than five years of evolution; they suffered from elther allergic or intrinsic asthma and some had experienced recurrent respiratory tract infections. predominantly of viral etiology. Serum levels of IgA, IgG and IgM were measured by nephelometry and total lgE was determined by an Enzyme-Linked immunosorbent Assay (ELISA. Total lg

  2. Prevalencia de anticuerpos contra Leptospira en personas asintomáticos y en perros de Chancay, Lima 2001

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    Manuel Céspedes

    2007-10-01

    Full Text Available Objetivos. Determinar la prevalencia de anticuerpos contra Leptospiras en personas asintomáticas dedicadas a la agricultura, pesca y comercio y en perros domésticos de localidades de Chancay (Huaral, Lima. Material y métodos. Estudio transversal analítico, se tomó muestras de suero de 268 pobladores de tres localidades, en quienes se evaluó la presencia de anticuerpos totales contra Leptospiras por el método de ELISA IgG y la prueba de microaglutinación (MAT. Se buscaron los factores asociados con la positividad a Leptospiras calculando el OR con su intervalo de confianza al 95%. De la misma manera, se tomó muestras de suero de 241 perros a los que se realizó la prueba de MAT. Resultados. La prevalencia de anticuerpos contra Leptospira en población asintomática fue de 10,1% (IC95%: 6,3-13,9, la cual estuvo asociada con el abastecimiento de agua para consumo en quebrada o pozo (OR: 3,48, IC95%: 1,39-8,74, con el antecedente de nadar en el río o acequia (OR: 4,75, IC95%: 1,51-14,92 y con tener una edad entre 21-40 años (OR: 2,47, IC95%: 1,10-5,52. Los serovares más frecuentes fueron Icterohaemorrhagiae y Canicola según MAT. En canes, 27,8% (67/241 tuvieron serología positiva a leptospiras. Conclusiones. Existe una mediana prevalencia de serología positiva para Leptospiras en la población general asintomática y condiciones favorables para la presencia de Leptospiras en las localidades estudiadas. En estas zonas se recomienda realizar actividades educativas preventivas frecuentes, tomando en cuenta los resultados de este estudio y el personal de salud debe sospechar de la leptospirosis como una causa de enfermedad febril.

  3. Anemia hemolítica autoinmune mediada por IgG e IgA en un paciente con colitis ulcerativa

    OpenAIRE

    Rivera Barquero, Ángelo; Cano López, Francis

    2015-01-01

    La colitis ulcerativa crónica indeterminada (CUCI) se caracteriza por una inflamación que afecta en su inicio principalmente al recto, pudiendo extenderse en forma continua y difusa hacia el colon. La anemia es muy frecuente en pacientes con CUCI debido a sangrados y a la cronicidad de la enfermedad. Además, la CUCI puede disminuir la tolerancia inmunológica, lo que puede desencadenar en algunos casos la anemia hemolítica autoinmune (AHAI) mediada normalmente por anticuerpos del tipo IgG. La ...

  4. Identificación de infección primaria y secundaria al virus de la rubéola mediante la detección de la avidez de la IgG en muestras de un brote en el 2004 en Cuba

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    Yahisel Tejero

    2013-12-01

    Full Text Available La rubéola es una enfermedad infectocontagiosa que afecta a niños y adultos jóvenes, y cuando esta se produce en el primer trimestre del embarazo ocasiona malformaciones congénitas en el feto. En el Laboratorio Nacional de Referencia de Sarampión, Rubéola y Parotiditis del Instituto de Medicina Tropical "Pedro Kourí", se realizó la detección del índice de avidez relativo (IAR de la IgG en 15 pares de sueros correspondientes a igual número de pacientes adultos que enfermaron durante un brote de rubéola ocurrido en dos provincias de Cuba en el 2004, los cuales fueron positivos a anticuerpos de tipo IgM específicos al virus, y en algunos se encontró seroconversión o un aumento de cuatro veces el título entre los sueros de la fase aguda y convaleciente con la técnica de inhibición de la hemaglutinación. En 13 (86,6% de los pacientes estudiados se detectó infección primaria, mientras que en dos (13,3% de ellos la infección fue secundaria. La detección de la avidez de la IgG constituye un método alternativo útil para distinguir una infección primaria de una secundaria al virus de la rubéola y fortalece el diagnóstico de esta enfermedad en Cuba.

  5. Asociación entre enfermedad cardiovascular y anticuerpos contra Chlamydia pneumoniae

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    García-Elorriaga Guadalupe de los A

    2002-01-01

    Full Text Available Objetivo. Precisar si existe asociación entre enfermedad cardiovascular (ECV y anticuerpos contra Chlamydia en población mexicana. Material y métodos. Estudio transversal, realizado en la Unidad de Investigación en Inmunología e Infectología -Hospital de Infectología del Centro Médico Nacional La Raza (CMNR- y en el Servicio de Cirugía Cardiovascular y Asistencia Circulatoria, del Hospital General del CMNR, Instituto Mexicano del Seguro Social (IMSS, de agosto de 1998 a abril de 2000. Se determinaron anticuerpos IgG e IgM contra C. psittaci, C. trachomatis y C. pneumoniae mediante microinmunofluorescencia, en suero de 70 pacientes con ECV hospitalizados en el CMNR, mayores de 30 años, de uno u otro sexo, y se compararon con 140 sanos, pareados por edad y sexo. Se utilizaron muestras aleatorias simples, con un tamaño poblacional de 110, una prevalencia de 50% y un nivel de confianza de 99%. Para establecer la diferencia entre las proporciones de los títulos se utilizó ji cuadrada y se calculó la razón de momios. Resultados. El 94.3% (66/70 de los pacientes presentó IgG en contra de C. pneumoniae vs 37% (52/140 de los individuos sanos (p<0.001. Conclusiones. Existe una fuerte asociación entre anticuerpos IgG hacia C. pneumoniae y ECV.

  6. Determinación de anticuerpos anti-β2glicoproteína I en pacientes con síndrome antifosfolípido Anti- β2 glycoprotein antibodies in patients with antiphospholipid syndrome

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    Oscar Uribe Uribe

    2004-09-01

    Full Text Available EL objetivo de este estudio fue comparar la presencia de anticuerpos anti-β2glicoproteína I (anti- β2GPI con las pruebas convencionales de laboratorio de anticuerpos anticardiolipina (aCL y anticoagulante lúpico, y con las manifestaciones clínicas del síndrome antifosfolípido (SAF. Se incluyeron en el estudio 80 mujeres con SAF; 35 de ellas de la consulta de Reumatología y las otras 45 con historia de aborto recurrente espontáneo (ARE; 5 mujeres de la consulta de Reumatología sin SAF, 27 mujeres con ARE, sin SAF y un grupo control de 20 mujeres sanas en edad reproductiva. Se investigaron la presencia de anticuerpos IgG e IgM anticardiolipina (aCL e IgG anti- β2GPI por la técnica de ELISA, y el anticoagulante lúpico por la determinación del tiempo parcial de tromboplastina activado. Adicionalmente, se registraron las manifestaciones clínicas asociadas al SAF. De las pacientes con SAF, 25.7% del grupo de Reumatología (9/35 y 4.4% de las pacientes con ARE (2/45 fueron positivas para anticuerpos anti-β2GPI, mientras que ninguna de las mujeres sin SAF, ni de las mujeres del grupo control, fue positiva. La asociación entre la presencia de anti- β2GPI y los anticuerpos IgG e IgM aCL mostró una diferencia significativa en los títulos de 3+ (altamente positivos en contraste con los individuos negativos para anti- β2GPI. La positividad del anticoagulante lúpico también se correlacionó con la presencia de anticuerpos anti- β2GPI. No hubo diferencia significativa entre las diversas manifestaciones clínicas del SAF y la presencia de dichos anticuerpos. En conclusión, la determinación de anticuerpos anti- β2GPI tiene una alta especificidad en pacientes con SAF pero no se asoció con ninguna manifestación clínica en particular. The objective of this study was to compare the presence of anti-β2glycoprotein (anti- β2GPI antibodies with the conventional laboratory tests of anticardiolipin antibodies (aCL and lupus anticoagulant

  7. Patrón de immunoblotting y niveles de anticuerpos anti-Toxoplasma gondii en suero y humor acuoso de pacientes con lesiones de toxoplasmosis ocular

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    Morella Bouchard Pereira

    2014-07-01

    Full Text Available El objetivo de este estudio fue evaluar en muestras de suero y humor acuoso los niveles de anticuerpos anti-toxoplasma a través del Coeficiente de Goldmann y Witmer (CGW y el patrón de reconocimiento antigénico a través del immunoblotting (IB, en pacientes con serología positiva con y sin lesiones de toxoplasmosis ocular. Se recogieron simultáneamente muestras de suero y humor acuoso de 26 pacientes: un grupo de casos que poseían lesiones retinales de toxoplasmosis ocular en fase activa e inactiva (n=17 y un grupo control que requería cirugía ocular por presencia de cataratas (n=9. Las determinación de IgM e IgG específicas se realizó por ELISA de inmunocaptura e indirecto, respectivamente. Se utilizó la inmunodifusión radial para la cuantificación de la IgG total. El CGW resultó >2, indicativo de producción local de anticuerpos específicos en 12/17 de los casos, mientras que en los controles no se observó, esto evidenció una sensibilidad del 71% y una especificidad de 100%. En IB, la aparición de bandas diferentes en humor acuoso, indicativo de producción local de anticuerpos específicos se observaron en 11/17 de los casos y 1/9 de los controles, reflejando una sensibilidad de 65% y una especificidad de 89%. Al considerar las dos pruebas la sensibilidad se incrementó a un 73%, pero la especificidad disminuyó a 89%. En conclusión el IB es útil como prueba confirmatoria para diagnóstico de toxoplasmosis ocular, pero sólo como un complemento del coeficiente de GW especialmente en pacientes con lesiones atípicas donde el diagnóstico clínico es difícil. Aqueous humor and serum immunoblotting profiles and anti–toxoplasma gondii antibodies in patients with toxoplasmosis-induced retinal lesions Abstract The purpose of this study was to analize the anti-Toxoplasma gondii antibodies levels in serum and aqueous humor samples in patients with ocular toxoplasmosis by using Goldman and Witmer Coefficient (GWC and the

  8. Neuromielitis óptica con alta expresión de acuaporina-4 y anticuerpos anti-acuaporina-4 positivos en suero

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    Alejandra Báez

    2012-04-01

    Full Text Available La presencia de anticuerpos IgG en suero, con blanco en los canales de acuaporina-4, es específica de la neuromielitis óptica (NMO. El 60% de los pacientes con NMO presentan lesiones cerebrales en la resonancia magnética (RM; en un 8% (mayoría niños estas lesiones se consideraron "atípicas". Presentamos dos pacientes con NMO y lesiones en el SNC de alta expresión de acuaporina-4. Caso 1: varón de 50 años, que comenzó con pérdida de visión en ojo derecho (OD. Recibió tratamiento empírico con metilprednisolona 1 g/d x 3 días. Al mes presentó dolor generalizado y hemiparesia derecha; nuevamente recibió metilprednisolona 1 g/d x 5 días e IgG IV 400 mg/kg/d × 5 días. Recuperó la deambulación persistiendo el dolor y fenómenos paroxísticos en los 4 miembros. Potenciales evocados visuales: P100, ojo izquierdo (OI 123 mseg. OD sin respuesta. La RM de cerebro (FLAIR mostró hiperintensidad en nervio óptico derecho, hipotálamo y comisura blanca anterior. RM cervical: lesión medular extensa (5 cuerpos vertebrales. Caso 2: mujer de 53 años, con disminución de la agudeza visual en ambos ojos y parestesias en miembros inferiores que remitieron espontáneamente. Evolucionó al mes con cuadriparesia e incontinencia esfinteriana. Recibió metilprednisolona 1 g/d x 5 días, sin mejoría. Potenciales evocados visuales: P100 OI 124 mseg. OD 128 mseg. RM cerebro: (FLAIR hiperintensidad hipotalámica y periacueductal. RM cervical: lesión medular extensa (7 cuerpos vertebrales. Anticuerpos anti-acuaporina-4 positivos en ambos pacientes (inmunofluorescencia indirecta. Las lesiones consideradas "atípicas", como aquí, en sitios con alta densidad de proteínas canales de agua AQP4 deberán considerarse para el diagnóstico diferencial.

  9. Inmunogenicidad de conjugados de polisacárido de Neisseria meningitidis serogrupo C unido al toxoide tetánico por diferentes brazos espaciadores

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    Osmir Cabrera

    2005-01-01

    Full Text Available El desarrollo de las vacunas conjugadas compuestas por polisacáridos unidos covalentemente a proteínas contra Haemophilus influenzae type b, han demostrado ser eficaces en infantes, lo que condujo al desarrollo activo de las vacunas conjugadas contra otros microorganismos por varios grupos de investigaci ón. La influencia en la respuesta inmune de la estructura de los brazos espaciadores utilizados en conjugados de polisacárido de N. meningitidis serogrupo C (PMGC-toxoide tetánico (TT fue evaluado en ratones Balb/c. Se determin ó la generación de anticuerpos IgG anti-PMGC e IgG anti-TT en los sueros de los animales inoculados por medio de un ELISA indirecto. También se evaluaron las subclases de anticuerpos IgG1 e IgG2a anti PMGC. El 1,6-diaminohexano (AH, el 1,8-diaminooctano (AO, el ácido 6-aminohexanoico (AA y la dihidrazida del ácido adípico (ADH, fueron utilizados como brazos espaciadores con diferentes estructuras químicas, unidos al PMGC y al TT por medio de la reacción con carbodiimida. El suero de todos los ratones que fueron inoculados con los conjugados presentaron elevados títulos de IgG anti-PMGC y los valores más elevados se encontraron en los sueros de animales inoculados con el conjugado en los que se utilizó al ADH como brazo espaciador. En los grupos de animales inmunizados con los conjugados que utilizaron al AO y al ADH se detectaron títulos de IgG2a superiores a los detectados para el PMGC no conjugado; se observaron los títulos de IgG2a más elevados en los sueros de ratones inmunizados con conjugados con ADH. Las concentraciones de anticuerpos IgG anti-TT observados en los sueros de los ratones inmunizados con los conjugados fueron más elevados que los determinados en el suero de animales inmunizados con el TT. Se concluyó que la respuesta inmune obtenida en los ratones después de ser inoculados con los conjugados varía en dependencia del brazo del espaciador utilizado, siendo más elevada cuando se

  10. Evaluación de la respuesta de anticuerpos hacia antígenos de Pseudomonas aeruginosa.

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    Aniel Moya

    2007-04-01

    Full Text Available Pseudomonas aeruginosa es un patógeno extracelular que genera una respuesta de anticuerpos específicos con utilidad para el diagnóstico y vacunas. En el presente estudio nos propusimos evaluar en suero humano los niveles de anticuerpos contra antígenos relevantes de P. aeruginosa. Realizamos la determinación de anticuerpos IgG contra tres exoenzimas, consideradas como factores de virulencia de mayor importancia en infecciones. Este resultado dio paso a la evaluación del reconocimiento de IgG e IgA hacia antígenos de la envoltura celular bacteriana por ELISA de células enteras. Todos los sueros evaluados mostraron títulos de IgG e IgA superiores a los individuos sanos, con excepción de dos muestras de pacientes que no mostraron alto título. Este ensayo permitió analizar el nivel de reconocimiento hacia los antígenos más expuestos de la bacteria que incluyen principalmente LPS y proteínas de membrana externa. Se encontró diferencias entre los valores de densidad óptica a 450 nm de individuos sanos y enfermos. El método usado permitió seleccionar dos sueros de pacientes de diferentes tipos de infecciones que fueron comparados por Western blot. Se observó que aunque los sueros tenían reacción hacia distintos serotipos de P. aeruginosa, la intensidad del reconocimiento variaba según el tipo de infección.

  11. Diagnóstico diferencial en la encefalitis por anticuerpos contra el receptor NMDA

    Science.gov (United States)

    González-Valcárcel, J.; Rosenfeld, M.R.; Dalmau, J.

    2011-01-01

    Resumen Introducción La encefalitis por anticuerpos contra el receptor de NMDA (NMDAR) suele desarrollarse como un síndrome característico de evolución multifásica y diagnóstico diferencial amplio. Pacientes Presentamos a 2 pacientes diagnosticadas de encefalitis por anticuerpos NMDAR con un cuadro clínico típico, pero que inicialmente señaló otras etiologías. Discusión La afectación frecuente de pacientes jóvenes con manifestaciones psiquiátricas prominentes indica frecuentemente otras consideraciones diagnósticas; las más frecuentes son las encefalitis virales, los procesos psiquiátricos y el síndrome neuroléptico maligno. Varios síndromes previamente definidos de manera parcial o descriptiva en adultos y pacientes pediátricos probablemente eran casos de encefalitis anti-NMDAR. Conclusiones La encefalitis anti-NMDAR debe considerarse en pacientes jóvenes con manifestaciones psiquiátricas subagudas, movimientos anormales y alteraciones autonómicas. La caracterización clínica e inmunológica de esta enfermedad ha llevado a la identificación de nuevos anticuerpos que afectan a procesos de memoria, aprendizaje, conducta y psicosis. PMID:20964986

  12. Estandarización de ensayos inmunoenzimáticos (ELISA para la cuantificación de anticuerpos IgG inducidos por una vacuna de vesículas de membrana externa de los serogrupos A y W135 de Neisseria meningitidis

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    Aleida Mandiarote

    2013-04-01

    Full Text Available La enfermedad meningocócica es una afección invasiva, de amplia incidencia mundial, cuyo agente causal es la bacteria gramnegativa Neisseria meningitidis . Existen vacunas polisacarídicas sin conjugar o conjugadas, contra cuatro de los cinco serogrupos responsables del 95% de los casos en el mundo. Para el serogrupo B, cuyo polisacárido es pobremente inmunogénico, se han evaluado varios candidatos vacunales producidos a base de vesículas de membrana externa. La determinación de la actividad bactericida y la cuantificación de IgG por ELISA han sido los métodos más utilizados en la medición de la respuesta inmune generada por vacunas contra la meningitis meningocócica. El segundo de estos métodos es utilizado en el Instituto Finlay como ensayo de inmunogenicidad para la liberación de lotes de VA-MENGOC-BC®. Como parte de una colaboración con investigadores noruegos, se trabaja en la obtención de un candidato vacunal contra los serogrupos A y W135 , basado en vesículas de membrana externa. En el presente trabajo se describe la estandarización de un ELISA para ser utilizado en la evaluación de la respuesta inmune del candidato vacunal bivalente.

  13. EVIDENCIA DE LA PRESENCIA DE ANTICUERPOS DE Mycoplasma hyopneumoniae EN CERDOS PROVENIENTES DE GRANJAS DE CRIANZA ARTESANAL DEL SUR DE LIMA.

    OpenAIRE

    Ibarra C., Marco; Practica privada.; Noé M., Norma; Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima; Alvarado S., Arnaldo; Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima. Apdo. 41-0068; Perales C., Rosa; Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, Lima. Apdo. 41-0068

    2014-01-01

    Se realizó un estudio para determinar la presencia de anticuerpos de Mycoplasma hyopneumoniae en cerdos provenientes de granjas de crianza artesanal, mediante la detección de anticuerpos, utilizando el ensayo inmuno absorbente ligado a enzimas(ELISA). Ciento sesenta animales de 8 a 9 meses de edad procedentes de granjas de 4 distritos ubicados al Sur de Lima, fueron muestreados al momento de ser beneficiados en 2 carmales frigoríficos del valle de Lima. Se obtuvo una frecuencia de animales po...

  14. Bajo índice de sospecha para deficiencia de anticuerpos en niños sometidos a procedimientos quirúrgicos de Otorrinolaringología

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    AB Ramírez-López

    2016-06-01

    Full Text Available INTRODUCCIÓN: las inmunodeficiencias primarias están subdiagnosticadas en todo el mundo, aun en centros de tercer nivel de atención. Los defectos de anticuerpos constituyen el grupo más prevalente y suelen manifestarse clínicamente después de los 6 meses de edad como infecciones respiratorias recurrentes causadas por bacterias encapsuladas. Algunas cirugías de oído-nariz y garganta se indican en pacientes con infecciones respiratorias recurrentes o complicadas que no han respondido adecuadamente al tratamiento médico. Estos niños sometidos a procedimientos quirúrgicos luego de una historia de infecciones respiratorias recurrentes pueden constituir un grupo de alto riesgo para inmunodeficiencias primarias.   OBJETIVO: indagar qué tan frecuentes son los defectos de anticuerpos en niños sometidos a cualquiera de tres cirugías de otorrinolaringología.   MATERIALES Y MÉTODOS: revisamos los expedientes electrónicos de niños que hubieran sido sometidos a adenoamigdalectomía (ATT, drenaje endoscópico de senos paranasales (ESD y colocación de tubos timpánicos de ventilación (TVT en nuestro instituto durante 2011-2012, en busca de niveles séricos de inmunoglobulinas (IgE, IgG, IgA, IgM.   RESULTADOS: encontramos 112 procedimientos quirúrgicos en 87 pacientes, de los cuales la indicación para cirugía fue infecciosa en 37 (21 varones, 1 muerto, edad media 7.3 años, más frecuentemente rinosinusitis (19/37 y amigdalitis (9/37 crónicas. Los procedimientos incluyeron: 24 adenoamigdalectomías, 13 drenajes endoscópicos de senos paranasales y 6 colocaciones de tubos timpánicos de ventilación, para un total de 43; ocho pacientes (21.6% fueron sometidos a más de una cirugía. La IgE sérica se encontró en el expediente de 27 pacientes (72.9%, y “al menos IgG” en 18 (48.6%. Sólo 70% de las pruebas fueron ordenadas antes de la cirugía. Los resultados anormales incluyeron: IgE elevada en 10/27, IgG

  15. Detección de anticuerpos contra artritis encefalitis caprina (AEC) mediante inmunoelectrotransferencia

    OpenAIRE

    Emiliano Tesoro Cruz; Rafael Hernández González; Alejandro Martínez Rodríguez; Hugo Ramírez Álvarez; María Elena Trujillo Ortega; Roberto Kretschmer Schmid; Álvaro Aguilar Setién

    2003-01-01

    En México la artritis encefalitis caprina (AEC) está presente, pero se ignora la frecuencia y prevalencia. El objetivo del presente trabajo fue evaluar la técnica de inmunoelectrotransferencia o western blot (WB) para la detección de anticuerpos anti-VAEC en sueros caprinos. Se evaluaron 50 sueros de cabras nativas seleccionadas al azar (25 de Amazcala, Querétaro, y 25 de Cuautitlán, Estado de México) por ensayo inmunoenzimático (ELISA) y WB. El criterio de positividad para WB fue el propuest...

  16. Asociación entre la presencia de anticuerpos anti-Ras y anti-VPH16 E4/E7 y lesiones intraepiteliales del cérvix

    Directory of Open Access Journals (Sweden)

    Vázquez-Corzo Sara

    2003-01-01

    Full Text Available OBJETIVO: Determinar si anticuerpos séricos contra E4, E7 y Ras pueden ser utilizados como marcadores de lesiones tempranas del cérvix uterino asociadas al virus del papiloma humano. MATERIAL Y MÉTODOS: Entre marzo de 1999 y abril de 2000 se realizó un estudio sero-epidemiológico de casos y controles en la clínica de displasias del Hospital General Doctor Gea González, en la Ciudad de México, en 116 muestras de suero para evaluar la presencia de anticuerpos anti-E4, E7 y Ras utilizando un ELISA de captura. Se estimaron razones de momios e intervalos de confianza de 95% RESULTADOS: Anticuerpos anti-E7 se asociaron a mujeres con lesiones NIC III, mientras que anticuerpos anti-E4 y anti-Ras fueron más frecuentes en lesiones NIC I-II. Al evaluar el perfil de anticuerpos que presentaron las mujeres, encontramos que a anticuerpos contra dos proteínas predicen la existencia de una lesión NIC I-II, y b la presencia de tres anticuerpos predicen una lesión NIC III. CONCLUSIONES: La detección de anticuerpos séricos contra E4, E7 y Ras en combinación con otras técnicas de diagnóstico, podrían ser de utilidad para detectar oportunamente a mujeres con lesiones tempranas asociadas al Virus del Papiloma Humano y en riesgo de desarrollar cáncer.

  17. Antimalaric antiobodies in school children in El Bagre, Colombia Detección de anticuerpos antimaláricos en un grupo de escolares del municipio de El Bagre, Antioquia

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    Isabel Polanco

    1998-01-01

    Full Text Available A cases and controls study was carried out in 1996 in El Bagre, Colombia, endemic zone for malaria, in order to determine the relationship between nutritional situation and immune response to malaria in 51 children with malaria and 49 without it; IgG and IgM antibodies were determined by means of indirect inmunofluorescence .against P. falciparum antigens (Strain FCB2. Nutritional situation was evaluated according to USA National Center for Health Statistics. No child was found positive for IGM antibodies; concerning IgG response, it was positive in 29 (56.9% malaric children but only in 4 (8.2% of the non-malaric ones (p<0.00001 . Difference was also signjficant (p<0.00001 for malarja antecedents in the previous year (70.6% in malaric children vs 10.2% jn the nonmalaric ones. Of the 29 malaric seropositive children 20 (69% were malnourished (p<0.01 . En 1996, en el municipio de El Bagre (Antioquia-Colombia, zona endémica para malaria y con altos niveles de desnutrición, se realizó un estudio de casos y controles con el objeto de determinar la relación entre el estado nutricional y la respuesta inmune humoral de niños con y sin malaria. Se trabajó con un grupo de 100 niños entre 4 y 9 años de edad, 51 con malaria y 49 sin ella, al cual se le determinaron los niveles de anticuerpos antimaláricos IgG e IgM por la técnica de inmunofluorescencia indirecta (IFI, empleando antigenos de P. falciparum cepa FCB 2 mantenida en cultivo continuo. El estado nutricional se evaluó por comparación de las medidas antropométricas con la referencia de crecimiento del National Center for Health Statistics (NCHS de los Estados Unidos. Los resultados mostraron diferencias en la tasa de positividad de anticuerpos IgG entre los niños maláricos y los no maláricos. En efecto: Veintinueve niños maláricos (56.9% y sólo 4 de los no maláricos (8.2% tenían dichos anticuerpos (P<0.00001 ; la diferencia también fue significativa para el antecedente de

  18. Producción de un anticuerpo IgY específico contra el antígeno CD41 humano

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    Esteban J. Gutiérrez Calzado

    2009-01-01

    Full Text Available Desde hace dos décadas, la comunidad científica muestra un gran interés hacia la generación de anticuerpos en gallinas ponedoras por las ventajas que estas aportan al compararse con otros métodos tradicionales para este fin, sobre todo, en el hecho de lograrse en ellas, mejores respuestas de anticuerpos hacia antígenos de mamíferos muy conservados en la filogenia entre los que se encuentran glicoproteínas de membrana celular. El objetivo de este trabajo fue la generación de anticuerpos específicos contra la glicoproteína de membrana plaquetaria humana gpIIb/IIIa (antígeno CD41 en gallinas ponedoras. Para este propósito, se utilizaron gallinas de 22 semanas de edad, a las que se les aplicaron dosis de 20 ¿g de una preparación inmunopurificada de este antígeno plaquetario, emulsionada con adyuvante completo e incompleto de Freund para una primera y segunda inmunización respectivamente, a intervalos de un mes. Se cosecharon los huevos diariamente de los animales inmunizados a partir de un día antes de esta aplicación hasta 30 d posteriores a la segunda inyección, se procesaron estos para la extracción de los anticuerpos específicos presentes en ellos y se obtuvo la dinámica de producción de anticuerpos por el método clásico de Ouchterlony que se enfrentó a una preparación pura del antígeno. Las respuestas de anticuerpos obtenidas resultaron en títulos adecuados susceptibles de investigar en usos posteriores en la Medicina Transfusional específicamente para el análisis de la calidad de plasmas.

  19. ANTICUERPOS DIRIGIDOS A PEQUEÑAS MOLÉCULAS DE NEUROTRANSMISORES Y PÉPTIDOS: PRODUCCIÓN Y APLICACIÓN DE ANTICUERPOS A DOPAMINA, SEROTONINA, GABA, VASOPRESINA, PÉPTIDO VASOACTIVO INTESTINAL, NEUROPÉPTIDO Y, SOMATOSTATINA Y SUSTANCIA P

    OpenAIRE

    Buijs, Ruud M.; Ma. del Carmen Basualdo S.

    2009-01-01

    En el presente trabajo se describe un procedimiento por medio del cual pueden ser obtenidos anticuerpos a partir de moléculas pequeñas de neurotransmisores usando glutaraldehido como agente acoplador. Este procedimiento fue desarrollado bajo la condición de que el inmunógeno usado para la preparación del anticuerpo fuera, hasta donde fuese posible, de la misma identidad que la molécula transmisora fijada al tejido. Con el de fin de lograr mayor éxito, los péptidos, aminas o aminoácidos1 fuero...

  20. Inmunodeficiencias primarias por déficit de anticuerpos en adultos

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    María Mercedes Bello Rodríguez

    2014-10-01

    Full Text Available Se realizó una investigación sobre los pacientes con inmunodeficiencias primarias por déficit de anticuerpos, atendidos en el servicio de inmunología del Hospital General “Dr. Ernesto Guevara” de Las Tunas, con el objetivo de caracterizar las inmunodeficiencias por déficit de anticuerpos en pacientes adultos, atendiendo al tipo de inmunoglobulina afectada, el sexo y la edad, así como las principales manifestaciones clínicas. Se evaluaron un total de diez pacientes tratados por esta causa entre los años 2005 y 2013. Para la evaluación de los resultados se utilizó el análisis de frecuencias simple. Las inmunodeficiencias diagnosticadas se correspondieron en un 50% con el déficit de las tres clases de inmunoglobulinas. Predominó el sexo masculino en un 70% y las edades más afectadas se correspondieron con la cuarta y quinta décadas de la vida. Las infecciones respiratorias y digestivas fueron las más frecuentes (80%, tanto por gérmenes bacterianos como virales, la infección por Giardia lamblia también apareció muy frecuentemente en los pacientes estudiados

  1. Anticuerpo anticitrulina y manifestaciones extra articulares en artritis reumatoidea

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    María Jezabel Haye Salinas

    2013-02-01

    Full Text Available Los pacientes con artritis reumatidea (AR pueden desarrollar manifestaciones extra articulares (MExA, relacionadas a su morbi-mortalidad. Los anticuerpos anti-péptidos citrulinados cíclicos (ACCP son específicos para la AR y estan relacionados con el daño articular; y podrían tener rol patogénico en las MExA. Nuestro objetivo fue determinar la relación entre los anticuerpos ACCP y MExA en pacientes con AR. Se incluyeron 74 pacientes con diagnóstico de AR (ACR 1987 mayores de 18 años, de más de 6 meses de evolución, con MExA, y un control apareado por sexo y edad sin MExA por cada paciente. Las variables demográficas, clínicas y de laboratorio se compararon con test t, chi cuadrado o Mann-Whitney. Se realizó análisis multivariado; p ≤ 0.05. Los pacientes con MExA presentaron mayor título de anticuerpo ACCP (116 vs. 34, p < 0.01 y de factor reumatoideo (FR (108 vs. 34.5, p < 0.01. En el análisis multivariado hubo asociación entre la presencia de MExA y tabaquismo activo (p = 0.02, OR: 3.78, IC 95%: 1.17-12.2, FR positivo (p = 0.04, OR: 3.23, IC95%: 1.04-11.8 y anticuerpo ACCP positivo (p = 0.04, OR: 3.23, IC 95%: 1.04-10. Presentaron mayor título de anticuerpo ACCP que los controles los pacientes con xerostomía (109 vs. 34, p = 0.04, xeroftalmia (150 vs. 34, p < 0.01, nódulos sub-cutáneos (NSC (141 vs. 34, p < 0.01 y fibrosis pulmonar (158 vs. 34, p = 0.04. En conclusión, el anticuerpo ACCP positivo, el FR positivo y el tabaquismo activo fueron factores de riesgo independientes para el desarrollo de MExA.

  2. Anticuerpos monoclonales específicos de inmunoglobulina G canina: caracterización y aplicación en inmunoensayos

    OpenAIRE

    2011-01-01

    En este trabajo se ha conseguido aislar la IgG+IgM de perro a partir de sueros de animales sanos y enfermos, considerado de gran interés dada la escasez de este tipo de reactivos en el mercado y de la importancia de los estudios inmunologicos en las especies de interes veterinario. A partir de la IgG comercial se ha producido y posteriormente caracterizado un panel de seis anticuerpos (CA2E9, CA3B8, CA3H1, CA4E7, CA4F1, CA5B2) frente a dicha inmunogloblulina. Dada la reaccion cruzada de los a...

  3. Complicaciones clínicas en una serie de pacientes con anticuerpos anticardiolipina Clinical complications in a series of patients with anticardiolipin antibodies

    OpenAIRE

    Pujol, A; E. Alegría; J González; Ch. Ngare; J. Pérez; J. A. Páramo

    2003-01-01

    Se han analizado las complicaciones clínicas determinadas con métodos objetivos en 68 pacientes de la Clínica Universitaria de Navarra con sospecha clínica de síndrome antifospolípido (SAF) y presencia de anticuerpos anticardiolipina (ACA). Se consideraron para el estudio, pacientes con título de IgG superior a 23 GPL. La patología más prevalente fue la trombosis: trombosis venosas (42,6%) y arteriales (22%). Otras complicaciones fueron abortos (23,8% de las 42 mujeres) y trombocitopenia (12,...

  4. Trasplante renal en pacientes con anticuerpos dirigidos contra donante

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    Federico Cicora

    2014-10-01

    Full Text Available En trasplante renal, los anticuerpos donante-específicos por ensayos de fase sólida predicen el rechazo temprano mediado por anticuerpos, incluso con resultados negativos de citometría de flujo o citotoxicidad dependiente del complemento. Aquí se describen los protocolos de inmunosupresión y los resultados a diez meses de cuatro pacientes en los que se detectó anticuerpos donante-específicos anti-antígenos leucocitarios humanos (HLA por Luminex®, pero no detectados por el método de citotoxicidad dependiente de complemento (CDC ni por citometría de flujo. Los cuatro pacientes recibieron tratamiento de inducción con 5 dosis de timoglobulina de 1.25 mg/kg y 5 dosis de inmunoglobulina intravenosa (IVIG de 400 mg/kg. Además, uno recibió 20 mg de basiliximab el mismo día del trasplante y el día 4 postrasplante; otro recibió 3 sesiones de plasmaféresis en los días -5, -3, y -1 y eculizumab en dosis de 1200 mg antes del trasplante, 900 mg el día 1, and 600 mg por semana durante un mes. En todos los casos, la inmunosupresión de mantenimiento consistió en tacrolimus, micofenolato y deltisona. Todos presentaron buenos resultados en el corto plazo. Nuestra experiencia sugiere que los pacientes con anticuerpos donante-específicos anti-HLA detectados solo por Luminex® deben recibir un seguimiento estricto y que en esta población se pueden obtener buenos resultados a partir del uso de terapia de inducción con timoglobulina e IVIG.

  5. Evaluación de anticuerpos contra enfermedades prevenibles por vacunas en el binomio madre–recién nacido en hospitales de Ciudad de La Habana

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    Rolando Felipe Ochoa

    2007-08-01

    Full Text Available El sistema inmune es inmaduro en los recién nacidos, lo que los hace susceptibles a las enfermedades infecciosas, sin embargo, pueden ser parcialmente protegidos por los anticuerpos adquiridos a través de la placenta. Por ello, nos propusimos evaluar la transferencia transplacentaria de anticuerpos contra algunas enfermedades prevenibles por vacunas. Se realizó un ensayo prospectivo, aleatorio, en el binomio madre–recién nacido. Para ello se analizó un total de 96 pares de muestras de suero, tomadas en el salón de preparto y al nacimiento en hospitales de Ciudad de La Habana, durante el año 2004. Se emplearon técnicas inmunoenzimáticas para determinar los niveles de antitoxina tetánica (ATT, antitoxina diftérica (ATD y anticuerpos contra proteínas de membrana externa del meningococo B (PME, contra el polisacárido capsular del meningococo C (PSC y contra el polisacárido Vi de Salmonella Typhi. Se detectó un nivel apropiado de ATT, tanto en las madres como en los recién nacidos, predominando los valores correspondientes a la protección de larga duración (>1 UI/mL, con 88,54% y 92,71%, respectivamente. Se observó niveles de ATD inferiores a 0,1 UI/mL, límite para una protección confiable, en el 54,17% y 45,83% de las madres y los recién nacidos. El 90,63% de las madres y el 96,88% de los recién nacidos presentaron concentraciones de anticuerpos contra PME superiores a 2 µg/mL, así como el 38,54% y el 41,67% para anticuerpos contra PSC. La seroprotección contra la Salmonella Typhi (>1 µg/mL fue de 5,21% y 8,33%, respectivamente. La mayoría de los recién nacidos presentaron títulos superiores de anticuerpos al de sus madres, lo cual demuestra que la transferencia transplacentaria de anticuerpos es un mecanismo eficiente.

  6. Los niveles de anticuerpos anti factor plaquetario 4-heparina y el índice 4T para trombocitopenia inducida por heparina

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    Marta E. Martinuzzo

    2012-02-01

    Full Text Available La trombocitopenia inducida por heparina (HIT es un efecto adverso del tratamiento con heparina, mediada por anticuerpos anti complejo factor plaquetario 4 (PF4-heparina (HPIA. La HIT es frecuentemente moderada pero pueden desarrollarse complicaciones trombóticas. El diagnóstico precoz es importante. La detección de HPIA por ELISA tiene alta sensibilidad pero baja especificidad (títulos bajos sin significación clínica. El índice de las 4T (índice 4T puede detectar pacientes con alto riesgo de HIT. El propósito del estudio fue correlacionar los niveles de HPIA y el índice 4T de un grupo de pacientes derivados a nuestro centro. Evaluamos 84 pacientes, 34 de ellos desarrollaron trombosis. Cada médico completó un cuestionario clínico que fue remitido con la muestra a nuestro centro. Los cuestionarios fueron analizados por un investigador externo y el índice 4T se calculó previamente al ensayo. Los HPIA se determinaron por un ELISA (Asserachrom HPIA que detecta los 3 isotipos, IgG, IgM e IgA, único reactivo disponible en Argentina. Los resultados se expresaron como porcentaje de absorbancia (%ABS. La correlación del índice 4T con los HPIA fue 0.472 (rho spearman, p < 0.001. Los pacientes con índice 4T ≥ 6 presentaban %ABS mayores que los ≤ 5 (67 vs. 39, p < 0.001. Aquéllos con trombosis presentaron títulos mayores que los que no la desarrollaron (%ABS 59 vs. 39, p = 0.017. En conclusión: Los títulos altos de HPIA medidos por ELISA, que detecta los 3 isotipos, correlacionaron claramente con el índice 4T ≥ 6 y fueron más frecuentes en los pacientes con trombosis, coincidiendo con lo ya descripto para ensayos de ELISA específicos para isotipo IgG.

  7. Asociación entre la presencia de anticuerpos anti-Ras y anti-VPH16 E4/E7 y lesiones intraepiteliales del cérvix

    OpenAIRE

    Vázquez-Corzo Sara; Trejo-Becerril Catalina; Cruz-Valdez Aurelio; Hernández-Nevarez Pilar; Esquivel-Guadarrama Fernando Roger; Gutiérrez-Xicotencatl Ma de Lourdes

    2003-01-01

    Objetivo. Determinar si anticuerpos séricos contra E4, E7 y Ras pueden ser utilizados como marcadores de lesiones tempranas del cérvix uterino asociadas al virus del papiloma humano. Material y métodos. Entre marzo de 1999 y abril de 2000 se realizó un estudio sero-epidemiológico de casos y controles en la clínica de displasias del Hospital General Doctor Gea González, en la Ciudad de México, en 116 muestras de suero para evaluar la presencia de anticuerpos anti-E4, E7 y Ras utilizando un ELI...

  8. Prevalencia de anticuerpos contra virus dengue en el cantón de Golfito (2005 y en el Distrito Central de Puntarenas (2005-2006, Costa Rica

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    Margarita Lee-Lui

    2008-09-01

    Full Text Available Justificación y objetivo: La primo infección con el virus dengue varía desde asintomática hasta cuadros muy severos, como el dengue hemorrágico o el síndrome de choque por dengue. El Distrito Primero de Puntarenas ha sido una de las poblaciones más afectadas desde 1993, cuando aparecieron los primeros brotes, hasta hoy, con una disminución de la incidencia en los últimos años. La región Brunca fue la segunda en incidencia en el país en 1998, y si bien la endemicidad se ha mantenido, no existen estudios epidemiológicos sobre la prevalencia de esta enfermedad; los datos que aporta el Ministerio de Salud corresponden a la incidencia de casos clínicos en un período determinado. El objetivo de este estudio fue determinar la seroprevalencia en el Distrito Primero de Puntarenas y en Golfito para conocer la vulnerabilidad de la población de sufrir fiebre hemorrágica por dengue y analizar la situación asociada a los datos epidemiológicos de estas regiones, tales como edad, sexo y ubicación geográfica, ya que una población susceptible es la que presenta una alta seroprevalencia, unida a condiciones de hacinamiento y alta densidad vectorial. Métodos: El muestreo se realizó con el método EPI descrito por la OMS. Se recolectaron 210 muestras de suero en cada distrito, se desarrolló y estandarizó una prueba de ELISA de captura de antígeno para la detección de anticuerpos tipo IgG contra dengue, usando como referencia el método de reducción de placas de Dulbecco considerado estándar de oro. Resultados: La seroprevalencia contra dengue fue del 43.8% (92 y del 90% (189 en los distritos de Golfito y Central de Puntarenas, respectivamente, sin diferencias significativas respecto al sexo, la edad y la localidad. Se obtuvo un 83% y un 95% de correlación en Golfito y Puntarenas, respectivamente, entre los casos sintomáticos y la serología con el método estandarizado. Un 32% y un 42% del total de seropositivos en cada localidad

  9. Thyroid autoantibodies in autoimmune diseases Anticuerpos antitiroideos en enfermedades autoinmunes

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    Regina M. Innocencio

    2004-06-01

    Full Text Available Abnormalities in the thyroid function and thyroid autoantibodies have been frequently described in patients with autoimmune diseases but seldom in antiphospholipid syndrome patients. In order to determine the prevalence of thyroid function and autoimmune abnormalities, we compared serum thyrotropin (TSH, serum free thyroxine (T4 levels, thyroid antithyroglobulin (TgAb and antithyroperoxidase (TPOAb levels of 25 patients with systemic sclerosis, 25 patients with rheumatoid arthritis and 13 patients with antiphospholipid syndrome to a control group of 113 healthy individuals. Evaluation included a thorough clinical examination with particular attention to thyroid disease and a serologic immune profile including rheumatoid factor, antinuclear and anticardiolipin antibody measurements. Subclinical hypothyroidism (4.2Ciertas anormalidades en la función tiroidea y anticuerpos antitiroideos han sido frecuentemente descriptos en pacientes con enfermedades autoinmunes, y más raramente en pacientes con el síndrome antifosfolipídico. Para determinar la prevalencía de anormalidades en la función tiroidea y de autoinmunidad, comparamos los niveles séricos de tirotropina (TSH tiroxina libre en suero (T4 anticuerpos antitiroglobulina (TgAb y antitiroperoxidasa (TPOAb en 25 pacientes con esclerosis sistémica, 25 pacientes con artritis reumatoidea y 13 pacientes con el síndrome antifosfolipídico con un grupo control de 113 individuos aparentemente sanos. La evaluación incluyó un completo examen clínico con particular atención para las enfermedades de la tiroides y una evaluación inmunológica incluyendo dosaje del factor reumatoideo, anticuerpos antinucleares y anticardiolipina. Hipotiroidismo subclínico (4.2anticuerpos anti-tiroglobulina (TgAb y/o anti-peroxidasa (TPOAb estaban presentes en 21/63 (33% de los

  10. Tuberculosis meníngea: desarrollo de inmunoensayos para detección de anticuerpos específicos y su potencial uso diagnóstico

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    María L. Gennaro

    2001-04-01

    Full Text Available

    En el mundo y en Colombia la tuberculosis meníngea (TBM es la causa más frecuente de las meningitis crónicas (1,2. Las características clínicas y los hallazgos de laboratorio la sugieren pero no la confirman, requiriéndose el cultivo que es demorado y de baja sensibilidad (2. La detección de anticuerpos contra una combinación de antígenos podría contribuir al diagnóstico (3.
    Para evaluarlo, nuestro objetivo fue determinar la utilidad diagnóstica de la detección de anticuerpos específicos para Mycobacterium tuberculosis en líquido cefalorraquídeo (LCR.

     

     

  11. Vasculitis asociadas a anticuerpos anti-citoplasma de neutrófilos: Clínica y tratamiento

    OpenAIRE

    María Virginia Paolini; Juan Pablo Ruffino; Diego S. Fernández Romero

    2013-01-01

    Las vasculitis asociadas a anticuerpos anti-citoplasma de neutrófilos (ANCA) comprenden a un grupo de enfermedades caracterizadas por la inflamación de la pared de pequeños vasos. Analizamos las características epidemiológicas y clínicas en una serie de 47 pacientes: 23 (49%) granulomatosis de Wegener (GW), 15 (32%) poliangeítis microscópica (PAM) y nueve (19%) vasculitis limitada al riñón (VLR). La edad media al inicio de los síntomas fue de 50.7 ± 14.9 años. La manifestación clínica más fre...

  12. Efecto de un anticuerpo monoclonal anti CD20 (Rituximab) en trombocitopenia inmune.

    OpenAIRE

    Untama, José; Médico, Departamento de Hematología, Hospital Nacional Edgardo Rebagliati Martins – EsSalud. Lima.; Del Carpio, Daniel; Médico, Departamento de Hematología, Hospital Nacional Edgardo Rebagliati Martins – EsSalud. Lima.

    2012-01-01

    Objetivo: Describir la respuesta terapéutica con un anticuerpo monoclonal anti CD20 (Rituximab), en pacientes con Trombocitopenia Inmune (PTI). Material y métodos: Estudio retrospectivo, descriptivo y observacional tipo serie de casos. Se revisaron las historias clínicas de pacientes adultos con PTI que recibieron el anticuerpo monoclonal anti CD20 (Rituximab), desde diciembre 2005 hasta diciembre 2010. Se definió respuesta: conteo plaquetario >30 mil, por lo menos duplicar el conteo plaqu...

  13. Anticuerpos ANTI-HTLV-I/II en una población del Amazonas colombiano

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    Abraham Blank

    2004-03-01

    Full Text Available

    En Colombia ya son varias las regiones donde se ha informado la presencia de la infección por los retrovirus linfotrópicos humanos tipos I y II (HTLV-I y HTLV-II. La principal región endémica para HTLV-I es el sur de la costa pacífica. El HTLV-II se ha encontrado en grupos indígenas que viven en diferentes regiones rurales como en la Guajira, la Orinoquía, en la costa pacífica y en una familia en Cali (urbana. Hasta el momento los estudios hechos en el Amazonas colombiano no habían confirmado la presencia de estos retrovirus. Se pretende estudiar la presencia de anticuerpos contra HTLV-I y/o HTLV-II utilizando una prueba comercial de Western blot que confirma y diferencia la infección por cada uno de los dos retrovirus mencionados, en caso de encontrar pruebas reactivas en pruebas de tamización.

    Luego de aceptar la participación en este estudio, se buscó la presencia de anticuerpos contra los retrovirus HTLV-I/II con pruebas de tamización en un total de 401 muestras de suero de personas que atendieron al Hospital de Leticia y a la consulta médica en Puerto Nariño. La muestra correspondió a 238 personas de raza mestiza y 163 de origen amerindio. Se realizaron pruebas de ELISA y/o aglutinación de partículas. Las muestras con pruebas de tamización reactivas, se sometieron a un estudio confirmatorio de la infección mediante el estuche comercial de Western blot Problot 2.4 de GeneLabs. En una mujer amerindia se demostró anticuerpos contra el HTLV-II, enun hombre mestizo contra el HTLV-I y en otro hombre mestizo contra el HTLV-II. No había enfermedad asociada en las personas estudiadas.

    La prevalencia de infección por los HTLV en la muestra estudiada fue 0.75%. Aunque este porcentaje no es muy elevado, debe

  14. Asociación entre anticuerpos antifosfolípidos y complicaciones de la gestación en mujeres de Costa Rica

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    Roubier Rojas-Barahona

    2007-04-01

    Full Text Available Objetivo: Determinar asociación entre los anticuerpos antifosfolípidos y complicaciones de la gestación (aborto de cualquier tipo, preeclampsia, eclampsia, insuficiencia placentaria grave o parto antes de la semana 34 de gestación, tomando como base la población de pacientes del servicio de Obstetricia del Hospital México. Materiales y métodos: Estudio de casos y controles en la población de pacientes atendidas por el servicio de Obstetricia del Hospital México en el período comprendido entre enero de 2002 y diciembre de 2004. Se tomaron los datos del registro de egresos Hospitalarios, se hizo un análisis descriptivo, en análisis univariado y multivariado de las principales variables registradas. Resultados: El promedio de edad de las pacientes en los casos y los controles no mostró diferencia significativa. La provincia de San José reporta el mayor porcentaje de casos con un 39.9%, seguido por Heredia con un 26.8% y Alajuela con un 24.6%. En cuanto al número de gestaciones, se determinó que no influyen significativamente en relación con el aborto y otras complicaciones de la gestación. El análisis univariado y multivariado mantiene asociación entre los antecedentes clínicos de las gestaciones anteriores, además de los anticuerpos antifosfolípidos respecto al aborto y otras complicaciones de la gestación. Conclusión: Los anticuerpos antifosfolípidos deberían ser tomados en cuenta como parte del seguimiento del embarazo en pacientes con historia de abortos y complicaciones de la gestación en embarazos previos.

  15. Manejo de la embarazada con isoinmunización por anticuerpos irregulares

    OpenAIRE

    Fuenzalida C,Javiera; Carvajal C,Jorge A

    2014-01-01

    La isoinmunización eritrocitaria feto-materna se define como la presencia de anticuerpos maternos dirigidos contra antígenos presentes en los glóbulos rojos fetales. Los anticuerpos maternos pueden atravesar la barrera placentaria y provocar hemólisis de los glóbulos rojos fetales produciendo anemia hemolítica e hiperbilirrubinemia, características de la enfermedad hemolítica perinatal (EHP). La principal causa de EHP es la incompatibilidad ABO, seguida de la isoinmunización por RhD; esta últ...

  16. Seguridad post-comercialización de los anticuerpos monoclonales antineoplásicos

    OpenAIRE

    González Iglesias, Verónica

    2016-01-01

    INTRODUCCIÓN: Los primeros anticuerpos monoclonales comercializados en España han sido rituximab, trastuzumab, bevacizumab, cetuximab y panitumumab, en este orden. El estudio de su seguridad en los primeros años postcomercialización es fundamental para definir su relación beneficio/riesgo en las condiciones de uso autorizadas. JUSTIFICACIÓN Y OBJETIVOS: Con el fin de estudiar la seguridad postcomercialización de los anticuerpos monoclonales nos planteamos como objetivos: 1) Analizar las s...

  17. OBTENCIÓN DE ANTICUERPOS ESPECÍFICOS PARA LA DETECCIÓN DEL VIRUS TaLMV DEL TOMATE DE ÁRBOL

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    Gutiérrrez Sánchez Pablo Andrés

    2011-08-01

    Full Text Available En Colombia el rendimiento del cultivo de árbol se ha visto seriamente afectado por la expansión de la enfermedad conocida como virosis. Esta patología se registró inicialmente en 1991 en el norte de Antioquia y su expansión ha alcanzado todas las regiones cultivadoras de este frutal en el país. Trabajos recientes han establecido la presencia de al menos dos especies de potyvirus asociadas a la virosis en los cultivos de tomate de árbol de Antioquia: Potato virus Y (PVY y Tamarillo leaf malformation virus (TaLMV, especie propuesta. Con el fin de reducir la diseminación de estos patógenos virales en el país, es necesario contar con herramientas de diagnóstico que permitan la certificación del material de siembra y la detección temprana en plantas asintomáticas. En este trabajo se presenta la obtención de anticuerpos específicos para la detección del virus TaLMV utilizando una región antigénica de 15 residuos de la cápside viral. La sensibilidad y especificidad de los anticuerpos fue evaluada mediante pruebas de ELISA y dot-blot utilizando proteína recombinante y péptidos sintéticos. La utilidad de estos anticuerpos fue validada a partir de una prueba piloto de detección de TaLMV en muestras de plantas de tomate de árbol obtenidas en el Oriente Antioqueño y los resultados comparados con los niveles de detección que ofrece la técnica de RT-PCR con cebadores específicos para la cápside viral de TaLMV.

  18. Validación del ensayo Vibriocida colorimétrico para determinar anticuerpos séricos contra cepas candidatas vacunales de Vibrio cholerae

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    Bárbara Cedré

    2003-03-01

    Full Text Available El Instituto Finlay posee un grupo de cepas atenuadas candidatas a vacuna oral contra el cólera, las cuales fueron evaluadas desde el punto de vista de su capacidad inmunogénica mediante la determinación de anticuerpos por el método ELISA y principalmente por el ensayo Vibriocida. Este ensayo mide la funcionalidad de los anticuerpos estimulados por la cepa vacunal, por lo que se considera la herramienta más eficaz para medir el estado de la inmunidad en individuos vacunados contra el cólera y constituye el soporte analítico para el desarrollo de la vacuna anticolérica cubana. En este trabajo se evaluaron la precisión, la especificidad y la robustez del ensayo y los resultados obtenidos estuvieron dentro del criterio de aceptación de esta técnica (>50% de coincidencia. Se demostró que las variaciones entre las muestras negativas y positivas se debían precisamente al crecimiento de V. cholerae y que se pueden incorporar pequeños cambios al ensayo sin que esto traiga consigo variaciones en el título de la muestra ni falsos resultados. De acuerdo con los resultados obtenidos, el mismo se considera apto para la evaluación de la respuesta inmune estimulada por un candidato vacunal contra el cólera.

  19. SISTEMA INMUNE Y GENÉTICA: UN ABORDAJE DIFERENTE A LA DIVERSIDAD DE ANTICUERPOS.

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    Matta Camacho Nubia Estela

    2011-12-01

    Full Text Available RESUMEN Es común encontrar en los libros de inmunología o de genética un capítulo con el título de “sistema inmune y genética”, sin embargo su asociación se centra en cómo la generación de anticuerpos rompió el paradigma “un gen, una proteína”, pues en el caso de la producción de anticuerpos, un gen produce millones de proteínas. El sistema inmune tiene muchos vínculos con la genética y la herencia; esta asociación se da porque cualquier sustancia o compuesto que produzca un organismo, es un antígeno potencial cuando es reconocido como extraño por el sistema inmune de otro organismo, sea este de la misma o de diferente especie. La producción de proteínas que potencialmente pueden ser antigénicas están ligadas al genotipo del individuo. La capacidad de responder y el tipo e intensidad de respuesta a los antígenos también ha sido demostrado que está correlacionado con el genotipo del individuo en cuestión, así como deficiencias en las respuestas inmunes pueden estar asociadas con mutaciones o polimorfismos genéticos que resultan en la susceptibilidad a enfermedades infecciosas. Este artículo se busca presentar ejemplos de la relación del sistema inmune y la genética, en la misma dirección de la conferencia ofrecida para la cátedra de Sede “Todo lo que usted quiere saber de genética y nunca se atrevió a preguntar”. Palabras claves: HLA, respuesta inmune, grupos sanguíneos, antígenos. ABSTRACT It is common to find in immunology or genetic books a chapter entitled “immune system and genetics”; this association focuses on how the generation of antibodies broke the paradigm “one gene, one protein”, since in this case one gene generates millions of proteins. However, the immune system has many more links to genetics and heredity. For example, any substance or compound that an organism produces is a potential antigen, when it is recognized as foreign by the immune system of another

  20. Marcadores inflamatórios e anticorpos anti-chlamydia em pacientes com síndrome metabólica Marcadores inflamatorios y anticuerpos anti-chlamydia en pacientes con síndrome metabólico Inflammatory markers and antichlamydial antibodies in patients with metabolic syndrome

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    Rosecler Riethmuller Franco

    2011-02-01

    ão mostraram diferença significativa em pacientes com SM, com e sem eventos.FUNDAMENTO: El síndrome metabólico está asociado al aumento de riesgo de eventos cardiovasculares. Marcadores inflamatorios y anticuerpos anti-Chlamydia han sido relacionados al desarrollo y a la progresión de la aterosclerosis y de los eventos cardiovasculares. OBJETIVO: Evaluar los marcadores inflamatorios interleucina-6 (IL-6 y factor de necrosis tumoral-alfa (TNF-α y los anticuerpos anti-Chlamydia pneumoniae en pacientes con síndrome metabólico (SM, con y sin eventos cardiovasculares. MÉTODOS: Estudio transversal constituido por 147 individuos. De estos, 100 (68% con SM y sin eventos cardiovasculares; y 47 (32% con SM y con eventos cardiovasculares. De los individuos que habían sufrido eventos cardiovasculares, 13 (6,11% presentan infarto agudo de miocardio (IAM, y diez (4,7%, accidente cerebro vascular (ACV. El diagnóstico del SM fue determinado por los criterios del NCEP-ATPIII. RESULTADOS: La media de edad de los sujetos con eventos cardiovasculares fue de 61,26 ± 8,5 y de 59,32 ± 9,9 en los individuos sin esos eventos (p=0,279, habiendo predominio del sexo femenino. El grupo con SM y sin evento presentó mayor peso, altura, IMC y circunferencia abdominal. Para los individuos con eventos cardiovasculares (p=0,001, los marcadores inflamatorios IL-6 y TNF-α y la enfermedad vascular periférica fueron significativamente mayores. Se obtuvieron niveles elevados de anticuerpos IgG para Chlamydia pneumoniae en el grupo SM, sin eventos y de IgA en el grupo con eventos cuando fueron comparados los dos grupos. Con relación al IAM y al ACV, los anticuerpos anti-Chlamydia pneumoniae no demostraron significación estadística, comparados al grupo sin eventos cardiovasculares. Asociación fue observada con el uso de estatinas, hipoglicemiantes orales, inyectables y antiinflamatorios no esteroides en el grupo con esos eventos. CONCLUSIÓN: Marcadores inflamatorios se encuentran

  1. Asociación entre enfermedad cardiovascular y anticuerpos contra Chlamydia pneumoniae Association between cardiovascular disease and antibodies against Chlamydia pneumoniae

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    Guadalupe de los A García-Elorriaga

    2002-06-01

    Full Text Available Objetivo. Precisar si existe asociación entre enfermedad cardiovascular (ECV y anticuerpos contra Chlamydia en población mexicana. Material y métodos. Estudio transversal, realizado en la Unidad de Investigación en Inmunología e Infectología -Hospital de Infectología del Centro Médico Nacional La Raza (CMNR- y en el Servicio de Cirugía Cardiovascular y Asistencia Circulatoria, del Hospital General del CMNR, Instituto Mexicano del Seguro Social (IMSS, de agosto de 1998 a abril de 2000. Se determinaron anticuerpos IgG e IgM contra C. psittaci, C. trachomatis y C. pneumoniae mediante microinmunofluorescencia, en suero de 70 pacientes con ECV hospitalizados en el CMNR, mayores de 30 años, de uno u otro sexo, y se compararon con 140 sanos, pareados por edad y sexo. Se utilizaron muestras aleatorias simples, con un tamaño poblacional de 110, una prevalencia de 50% y un nivel de confianza de 99%. Para establecer la diferencia entre las proporciones de los títulos se utilizó ji cuadrada y se calculó la razón de momios. Resultados. El 94.3% (66/70 de los pacientes presentó IgG en contra de C. pneumoniae vs 37% (52/140 de los individuos sanos (pObjective. To evaluate the association between cardiovascular disease (CVD and antibodies against Chlamydia in Mexican population. Material and Methods. A cross-sectional study was conducted from August 1988 to April 2000, at the Immunology and Infectology Research Unit of Hospital de Infectología, Centro Médico Nacional La Raza (CMNR- and at the Cardiovascular Surgery and Circulatory Care, Hospital General CMNR, Instituto Mexicano del Seguro Social (IMSS. Study subjects were 70 CVD hospitalized patients, older than 30 years, from both genders. Serum IgG and IgM antibodies against C. psitaccii, C. trachomatis and C. pneumoniae were determined by microimmunofluorescence in study subjects and compared with those from 140 healthy individuals, matched by age and sex. Simple random sampling was used

  2. Neuromielitis óptica con alta expresión de acuaporina-4 y anticuerpos anti-acuaporina-4 positivos en suero Neuromyelitis optica with high aquaporin-4 expression and positive serum aquaporin-4 autoantibodies

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    Alejandra Báez

    2012-04-01

    Full Text Available La presencia de anticuerpos IgG en suero, con blanco en los canales de acuaporina-4, es específica de la neuromielitis óptica (NMO. El 60% de los pacientes con NMO presentan lesiones cerebrales en la resonancia magnética (RM; en un 8% (mayoría niños estas lesiones se consideraron "atípicas". Presentamos dos pacientes con NMO y lesiones en el SNC de alta expresión de acuaporina-4. Caso 1: varón de 50 años, que comenzó con pérdida de visión en ojo derecho (OD. Recibió tratamiento empírico con metilprednisolona 1 g/d x 3 días. Al mes presentó dolor generalizado y hemiparesia derecha; nuevamente recibió metilprednisolona 1 g/d x 5 días e IgG IV 400 mg/kg/d × 5 días. Recuperó la deambulación persistiendo el dolor y fenómenos paroxísticos en los 4 miembros. Potenciales evocados visuales: P100, ojo izquierdo (OI 123 mseg. OD sin respuesta. La RM de cerebro (FLAIR mostró hiperintensidad en nervio óptico derecho, hipotálamo y comisura blanca anterior. RM cervical: lesión medular extensa (5 cuerpos vertebrales. Caso 2: mujer de 53 años, con disminución de la agudeza visual en ambos ojos y parestesias en miembros inferiores que remitieron espontáneamente. Evolucionó al mes con cuadriparesia e incontinencia esfinteriana. Recibió metilprednisolona 1 g/d x 5 días, sin mejoría. Potenciales evocados visuales: P100 OI 124 mseg. OD 128 mseg. RM cerebro: (FLAIR hiperintensidad hipotalámica y periacueductal. RM cervical: lesión medular extensa (7 cuerpos vertebrales. Anticuerpos anti-acuaporina-4 positivos en ambos pacientes (inmunofluorescencia indirecta. Las lesiones consideradas "atípicas", como aquí, en sitios con alta densidad de proteínas canales de agua AQP4 deberán considerarse para el diagnóstico diferencial.Disease-specific aquaporin-4 antibodies (NMO-IgG are the main effector of lesions in neuromyelitis optica (NMO patients. Brain MRI lesions are detected in 60% of them, with 8% (almost infants at sites of high

  3. Papel de los anticuerpos en la protección contra micobacterium tuberculosis

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    Nesty Olivares

    2006-12-01

    Full Text Available Convencionalmente se asume que la defensa del hospedero contra Mycobacterium tuberculosis se basa en los mecanismos de inmunidad celular exclusivamente y se descarta el papel de los anticuerpos en la protección. En este trabajo se analizan evidencias recientes que retan este dogma y sugieren la importancia de considerar la manipulación de la respuesta inmune humoral como una alternativa en la investigación de vacunas contra la tuberculosis.

  4. Anticuerpos anticardiolipina en pacientes con hipertensión arterial esencial

    OpenAIRE

    Diumenjo, M. S.; Testasecca, E.; Testasecca, A.; Maneschi, E.

    2014-01-01

    Los anticuerpos antifosfolípidos pueden activar el endotelio, modificar su función, alterar la regulación del tono vascular, producir daño renal, y así participar en la patogenia de la hipertensión arterial esencial. Antiphospholipid antibodies can activate the endothelium, alter their function, alter the regulation of vascular tone, cause kidney damage, and thus participate in the pathogenesis of essential hypertension. Fil: Diumenjo, M. S.. Universidad Nacional de Cuyo...

  5. Anticuerpos frente a virus West nile y otros virus transmitidos por artropodos en la poblacion del Delta del Ebro

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    Lozano Alvaro

    1998-01-01

    Full Text Available FUNDAMENTOS: El virus West Nile (VWN es un Flavivirus que se transmite al hombre a través de distintas especies de mosquitos y produce brotes y casos esporádicos de enfermedad en distintas regiones del Viejo Mundo, incluída la Cuenca Mediterránea. Las zonas húmedas europeas que acogen aves migratorias procedentes de África constituyen áreas de alto riesgo para esta infección, así como para otras infecciones víricas transmitidas por artrópodos. MÉTODOS: Con objeto de investigar la prevalencia de la infección por el VWN y otros virus de transmisión similar en la población humana del Delta del Ebro, se estudiaron 1037 muestras de suero, obtenidas en 10 localidades de la zona, para presencia de anticuerpos frente a VWN y otros 12 virus transmitidos por artrópodos (3 Alfavirus, 8 Flaviviridae y 1 Bunyaviridae mediante titulación por inhibición de la hemaglutinación (IHA. En algunos casos se estudió la presencia de IgM específica por IHA tras fraccionar el suero por centrifugación en gradientes de sacarosa. RESULTADOS: En total, se encontró reactividad significativa frente a alguno de los virus probados en 130 casos (12.5%; 4.1% frente a Alfavirus, 8.0% frente a Flaviviridae y 0.4% frente a Bunyaviridae. El análisis de los títulos de anticuerpos reveló porcentajes significativos de muestras con títulos elevados frente a antígenos de VWN y otros. La distribución de la seroprevalencia fue muy desigual, concentrándose fundamentalmente en 3 localidades del interior del Delta (Ampolla, San Jaime y Montells, donde la prevalencia de anticuerpos frente a Flaviviridae llegó a alcanzar el 30% y se observaron niveles residuales de IgM frente a VWN en algunos sueros. CONCLUSIONES: Estos resultados y los obtenidos previamente en otras regiones de la Península Ibérica sugieren que el VWN circula en la población humana de las zonas de riesgo y produce brotes epidémicos periódicos. Habida cuenta del alto porcentaje de

  6. Vasculitis asociadas a anticuerpos anti-citoplasma de neutrófilos: Clínica y tratamiento

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    María Virginia Paolini

    2013-04-01

    Full Text Available Las vasculitis asociadas a anticuerpos anti-citoplasma de neutrófilos (ANCA comprenden a un grupo de enfermedades caracterizadas por la inflamación de la pared de pequeños vasos. Analizamos las características epidemiológicas y clínicas en una serie de 47 pacientes: 23 (49% granulomatosis de Wegener (GW, 15 (32% poliangeítis microscópica (PAM y nueve (19% vasculitis limitada al riñón (VLR. La edad media al inicio de los síntomas fue de 50.7 ± 14.9 años. La manifestación clínica más frecuente fue el compromiso renal en 41 (87% pacientes, seguido por el pulmonar en 26 (55% y el otorrinolaringológico en 17 (36%. En 26 (55% se asoció compromiso renal y pulmonar. La forma clínica más frecuente fue la generalizada en 23 (49%, seguida por la grave en 18 (38%. El 89% presentaron determinaciones de ANCA positivas. Cuatro (8% no recibieron tratamiento inmunosupresor de inicio. De los 43 que recibieron tratamiento de inicio, 29 (67% tuvieron remisión completa, con un tiempo de remisión promedio de 35.3 meses. Once (26% presentaron recaídas, diez (91% recaídas mayores y uno (9% menor. Doce (28% fallecieron, siete en forma temprana y cinco durante la evolución de la enfermedad. Quince (31% evolucionaron a insuficiencia renal crónica. Los 26 pacientes en seguimiento tuvieron respuesta al tratamiento y 20 (77% de ellos estaban en remisión al finalizar el estudio. Las vasculitis asociadas a ANCA continúan siendo enfermedades de alta morbilidad y mortalidad, a pesar de las mejorías logradas con los tratamientos inmunosupresores.

  7. Desarrollo de superficies modificadas oro - anticuerpo anti-PSPB para su uso como biosensor en la detección de preñez bovina

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    Justo Laíz

    2011-05-01

    Full Text Available En este trabajo se presentan los resultados preliminares para el desarrollo de un biosensor amperométrico destinado a la cuantificación de Proteína B Específica de la Preñez (PSPB en fluidos biológicos como medio de diagnóstico clínico precoz de la preñez bovina. A la superficie de oro modificada con ácido mercaptoundecanoico (MUA se fijaron anticuerpos anti-PSPB y peroxidasa de rábano (HRP. Se verificó la inmovilización de las biomoléculas mediante voltamperometría cíclica y medida del ángulo de contacto.Se estudió el comportamiento electroquímico del electrodo desarrollado por medio de voltamperometría cíclica y medidas a potencial constante, estableciendo la relación entre el cambio de corriente catódica (al potencial de reducción de la quinona y la concentración de PSPB. Esta relación se ve afectada por la formación de complejos antígeno – anticuerpo que limitan el acceso del sustrato al sitio activo de la enzima, provocando una disminución en la señal eléctrica.El electrodo modificado de oro - anti-PSPB – HRP respondió de forma inversamente proporcional a la concentración de PSPB a un potencial de -200 mV (contra electrodo de referencia Ag/AgCl, tanto por voltamperometría cíclica como a potencial constante, y por tanto podría ser la base para el desarrollo de un biosensor amperométrico para detectar precozmente la preñez bovina.

  8. Prevalencia de anticuerpos para Trypanosoma cruzi en caninos de dos municipios endémicos de Boyacá

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    Diego Manrique Abril

    2012-04-01

    Full Text Available Objetivo. evaluar la prevalencia de anticuerpos anti Trypanosoma cruzi (T. cruzi en una muestra de caninos domésticos residentes en dos municipios endémicos. Materiales y métodos. Se tomaron muestras séricas de 20 caninos procedentes de hogares donde residen mujeres gestantes seropositivas y 40 perros habitantes de hogares de mujeres gestantes seronegativas en Miraflores y Moniquira, Boyacá. El análisis se realizó mediante prueba diagnóstica rápida dipstick de InBios. Resultados. Se encontró prevalencia del 16.7% en Moniquirá y del 13.3% Miraflores respectivamente con una prevalencia general del 15% en los dos municipios. Se halló riesgo 3 veces mayor de que ocurra la infección en caninos, en los hogares donde residen gestantes seropositivas; además la infestación por pulgas y garrapatas en el animal, hábitat cercano a la vivienda, se relacionan con mayor seropositividad en el canino. Conclusiones. La raza, el sexo, la presencia de aves en la casa y al examen clínico general son considerados factores pronósticos en en la infección por Trypanosoma cruzi en caninos. Como factores protectores se identificó la desparasitación y vacunación de los animales.

  9. Diagnóstico rápido de citomegalovirus (CMV en pacientes inmunocomprometidos mediante anticuerpos monoclonales que reconocen proteinas precoces virales Rapid diagnosis of cytomegalovirus infection in immunocompromised patients by using monoclonal antibodies against early viral antigens

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    Maritza Alvarez

    1989-06-01

    Full Text Available Se aplicó la técnica de detección de antigenos precoces fluorescentes (DAPF usando el anticuerpo monoclonal E-13 McAb, mediante el cual se lograron detectar 15 casos positivos a CMV de 75 muestras de orina o sangre ("buffy coat" tomadas de 52 pacientes inmunocomprometidos ingresados en el Instituto de Nefrología de ciudad Habana. Aplicando las técnicas clásicas de aislamiento en fibroblastos humanos diploides (MRC-5, se lograron aislar 12 cepas de CMV de casos previamente positivos por DAPF; lográndose además un aislamiento en una muestra reportada negativa por fluorescencia. Se observó una coincidencia de un 80% entre ambas técnicas. Se detectó la presencia de anticuerpos IgG contra CMV en todos los casos estudiados, utilizando para ello la técnica ELISA.A technique was applied to detect early fluorescent antigens (DEFA of cytomegalovirus (CMV using the E13 monoclonal antibodies in 52 immunocompromised patients hospitalized in the Nephrology Institute of Havana. Of the 75 urine or blood (buffy coat samples taken, 15 were found positive to CMV. Using classical diploide human fibroblast isolation technique, 12 CMV strains were isloation of previously detected positive samples by DEFA. In addition, CMV was isolated from one sample reported to be negative by DEFA. A coincidence of 80% was found between both techniques. With the ELISA test, all the sample studied have IgG antibodies to CMV.

  10. Complicaciones clínicas en una serie de pacientes con anticuerpos anticardiolipina Clinical complications in a series of patients with anticardiolipin antibodies

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    A. Pujol

    2003-12-01

    Full Text Available Se han analizado las complicaciones clínicas determinadas con métodos objetivos en 68 pacientes de la Clínica Universitaria de Navarra con sospecha clínica de síndrome antifospolípido (SAF y presencia de anticuerpos anticardiolipina (ACA. Se consideraron para el estudio, pacientes con título de IgG superior a 23 GPL. La patología más prevalente fue la trombosis: trombosis venosas (42,6% y arteriales (22%. Otras complicaciones fueron abortos (23,8% de las 42 mujeres y trombocitopenia (12,1%. En cuanto a la localización de la trombosis venosa, el predominio correspondió a extremidades inferiores (51,7%, seguida de tromboflebitis superficial (27,5% y tromboembolismo pulmonar (20,6%. Entre las complicaciones arteriales, las más frecuentes fueron enfermedad cerebrovascular (86,6% y la cardiopatía isquémica (13,4%. No existió correlación entre la presencia de títulos elevados de ACA y la prevalencia o severidad de las manifestaciones clínicas. En la serie de 68 pacientes con ACA IgG 23 GPL se aprecia un elevado porcentaje de trombosis venosas y arteriales detectadas con métodos objetivos. La presencia de ACA constituye un factor de riesgo protrombótico.An analysis was made of clinical complications, determined with objective methods, in 68 patients at the University Clinic of Navarra with the clinical suspicion of antiphospholipid syndrome (APS and presence of anticardiolipin antibodies (ACA. Patients with IgG higher than 23 GPL were considered for the study. The most prevalent pathology was thrombosis: venous thrombosis (42.6% and arterial thrombosis (22%. Other complications were abortions (23.8% of the 42 women and thrombocytopenia (12.1%. With respect to the localisation of venous thrombosis, predominance corresponded to lower extremities (51.7%, followed by superficial thrombophlebitis (27.5% and pulmonary thromboembolism (20.6%. Among the arterial complications, the most frequent were cerebrovascular disease (86.6 % and

  11. OBTENCIÓN DE ANTICUERPOS POLICLONALES IgY ANTIPARVOVIRUS CANINO A PARTIR DE YEMA DE HUEVO DE GALLINA

    OpenAIRE

    Pinto, J.; Barco, M.; Afanador, M.C.; Merchán, A.M.*;; Montañez, M.F.; Andrade, F; Torres, O.

    2005-01-01

    Inmunizando un grupo de diez gallinas de postura raza Lohmann de 16 semanas de edad con parvovirus canino (CPV) cepa vacunal, se obtuvieron anticuerpos IgY policlonales contra CPV en yema de huevo.En la extracción de los anticuerpos de la yema se requirieron dos pasos, el primero para la remoción de lípidos y el segundo para la precipitación de proteínas. Para la remoción de lípidos se usó el método PBS:Cloroformo y para la precipitación de los anticuerpos solubles (Inmunoglobulinas-IgY) se u...

  12. Asociación entre enfermedad cardiovascular y anticuerpos contra Chlamydia pneumoniae

    OpenAIRE

    García-Elorriaga Guadalupe de los A; Calderón-Abbo Moisés; González-Bonilla César R

    2002-01-01

    Objetivo. Precisar si existe asociación entre enfermedad cardiovascular (ECV) y anticuerpos contra Chlamydia en población mexicana. Material y métodos. Estudio transversal, realizado en la Unidad de Investigación en Inmunología e Infectología -Hospital de Infectología del Centro Médico Nacional La Raza (CMNR)- y en el Servicio de Cirugía Cardiovascular y Asistencia Circulatoria, del Hospital General del CMNR, Instituto Mexicano del Seguro Social (IMSS), de agosto de 1998 a abril de 2000. Se d...

  13. DESARROLLO Y ESTANDARIZACION DE TECNOLOGIAS PARA LA PRODUCCION DE ANTICUERPOS MONOCLONARES MODIFICADOS CON APLICACIONES EN BIOMEDICINA

    OpenAIRE

    AGUILLON GUTIERREZ, JUAN CARLOS

    2004-01-01

    Las proteínas recombinantes terapéuticas, conocidas como biofármacos, han revolucionado la industria farmacéutica, esperándose una creciente demanda en los próximos años. Dentro de éstos, destacan los anticuerpos recombinantes (AcR), que pueden clasificarse en quiméricos, humanizados y completamente humanos, hallándose varios de ellos disponibles comercialmente, con aplicaciones en el tratamiento del cáncer, enfermedades autoinmunes, rechazo de transplante renal, tratamiento de cardiopatía co...

  14. Anticuerpos antifosfolípido en el lupus eritematoso sistémico

    OpenAIRE

    López Soto, Alfonso

    1990-01-01

    INTRODUCCION: El lupus eritematoso sistémico (LES) es una enfermedad autoinmune que se caracteriza por la producción de numerosos autoanticuerpos. Recientemente, se ha descrito un nuevo grupo denominado anticuerpos antifosfolípido (AAF), cuyo estudio ha despertado un gran interés por sus implicaciones clínicas y patogenéticas. Los AAF son un grupo heterogéneo de autoanticuerpos adquiridos de forma espontánea, que van dirigidos contra estructuras fosfolipídicas de las membranas celulares.La de...

  15. ¿Sabía usted? Anticuerpos antifosfolípidos

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    Javier Molina

    1992-02-01

    Full Text Available

    Los anticuerpos antifosfolípidos comprenden varias poblaciones de inmunoglobulinas, que pueden ocasionar falsos positivos biológicos con el VDRL, interferir con el complejo activador de la protrombina (anticoagulante lúpico o reaccionar con elfosfolípido cardiolipina en una prueba de enzimoinmunoanálisis (EIA.

  16. Cubeta para la incubación y lavado de anticuerpos

    OpenAIRE

    Nogal París, María Luisa; Revilla Novella, Yolanda

    2008-01-01

    Cubeta para la incubación y lavado de anticuerpos. La cubeta comprende un cuerpo (1) lavable, inerte y no poroso, que está dotado de unos pocillos (2) ubicados en su interior, cuyo número y tamaño puede variar en función del requerimiento experimental. En dichos pocillos (2) se introducen preferiblemente fragmentos o tiras (3) de nitrocelulosa, que contienen proteínas que han sido previamente transferidas desde un gel de poliacrilamida utilizando un campo eléctrico. Es...

  17. OBTENCIÓN DE ANTICUERPOS POLICLONALES IgY ANTIPARVOVIRUS CANINO A PARTIR DE YEMA DE HUEVO DE GALLINA

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    Pinto, J.

    2005-06-01

    Full Text Available Inmunizando un grupo de diez gallinas de postura raza Lohmann de 16 semanas de edad con parvovirus canino (CPV cepa vacunal, se obtuvieron anticuerpos IgY policlonales contra CPV en yema de huevo.En la extracción de los anticuerpos de la yema se requirieron dos pasos, el primero para la remoción de lípidos y el segundo para la precipitación de proteínas. Para la remoción de lípidos se usó el método PBS:Cloroformo y para la precipitación de los anticuerpos solubles (Inmunoglobulinas-IgY se usó el método de salting-out con sulfato de amonio ((NH42SO4. La evaluación del proceso se efectuó empleando el método comercial estándar “EGGstract IgY Purification System®” de PROMEGA.La metodología empleada permitió la obtención de anticuerpos IgY policlonales contra CPV a partir de yema de huevo de gallina en concentraciones altas por mililitro de yema, con una pureza aceptable y títulos altos; los resultados fueron comparables con el método comercial.

  18. Determinación de Anticuerpos IgM contra Virus dengue partir de sangre absorbida en papel filtro: Un método alternativo y sencillo

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    María García M

    2000-01-01

    Full Text Available Objetivo: Se propone como alternativa la obtención de muestras de sangre total en papel filtro, para la determinación de anticuerpos IgM contra dengue, por ser un método de recolección sencillo y no requerir de muchos cuidados en el envío al laboratorio. Materiales y métodos: De 100 pacientes con diagnóstico clínico de dengue clásico, se obtuvieron en forma simultánea, muestras de suero en tubos al vacío y de sangre total en papel filtro. Ambas muestras fueron evaluadas con el método serológico ELISA Captura de IgM a los 30 días de obtenida la muestra. Resultados: De las 100 muestras 25 fueron positivas y 75 negativas en suero, y 24 positivas y 74 negativas en papel filtro. Se obtuvo una concordancia por índice Kappa de 0,97, sensibilidad y especificidad de 96,0% y 98,0% respectivamente; el valor predictivo positivo fue 96,0%, y valor predictivo negativo fue 98,0%. Conclusión: Se evidencia muy buena sensibilidad, especificidad y concordancia en la determinación de IgM contra dengue, al utilizar papel filtro en la obtención de muestra de sangre.

  19. Anticuerpos séricos contra la enfermedad de Newcastle e Influenza Aviar en aves rapaces de Chile.

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    Daniel González-Acuña

    2012-12-01

    Full Text Available Objetivo. Detectar la presencia de anticuerpos séricos sanguíneos contra los virus de la Enfermedad de Newcastle (ENC e Influenza aviar (IA, para comprender la contribución de las aves silvestres en la transmisión de estos virus en Chile. Materiales y métodos. Se analizaron 63 aves pertenecientes a los órdenes Falconiformes y Strigiformes desde centros de rehabilitación de aves de las zonas central y sur de Chile. Se realizaron las pruebas de inhibición de la hemoaglutinación (IHA para detectar anticuerpos contra el virus ENC e inmunodifusión en gel agar (IDGA y ELISA para IA. Resultados. Se detectaron 14 aves positivas (22.2% para anticuerpos séricos contra el virus de la ENC. En cambio, no se registraron anticuerpos séricos sanguíneos para el virus de la IA. Conclusiones. La presencia de aves rapaces positivas en los centros de rescate a los anticuerpos séricos contra el virus de la ENC puede ser explicada por el consumo de carne de pollos que han sido vacunados contra ENC o consumo de aves que han adquirido directamente el virus vacunal a través de los distintos procedimientos de administración (aerosoles, bebederos de la vacuna o por el ingreso a los centros de rescate de aves rapaces migratorias, las que podrían facilitar la diseminación de la infección desde los países de origen, hecho que debe ser investigado.

  20. Asociación entre la presencia de anticuerpos anti-Ras y anti-VPH16 E4/E7 y lesiones intraepiteliales del cérvix Association between anti-Ras and anti-HPV16 E4/E7 antibodies with cervical intraepithelial lesions

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    Sara Vázquez-Corzo

    2003-10-01

    Full Text Available OBJETIVO: Determinar si anticuerpos séricos contra E4, E7 y Ras pueden ser utilizados como marcadores de lesiones tempranas del cérvix uterino asociadas al virus del papiloma humano. MATERIAL Y MÉTODOS: Entre marzo de 1999 y abril de 2000 se realizó un estudio sero-epidemiológico de casos y controles en la clínica de displasias del Hospital General Doctor Gea González, en la Ciudad de México, en 116 muestras de suero para evaluar la presencia de anticuerpos anti-E4, E7 y Ras utilizando un ELISA de captura. Se estimaron razones de momios e intervalos de confianza de 95% RESULTADOS: Anticuerpos anti-E7 se asociaron a mujeres con lesiones NIC III, mientras que anticuerpos anti-E4 y anti-Ras fueron más frecuentes en lesiones NIC I-II. Al evaluar el perfil de anticuerpos que presentaron las mujeres, encontramos que a anticuerpos contra dos proteínas predicen la existencia de una lesión NIC I-II, y b la presencia de tres anticuerpos predicen una lesión NIC III. CONCLUSIONES: La detección de anticuerpos séricos contra E4, E7 y Ras en combinación con otras técnicas de diagnóstico, podrían ser de utilidad para detectar oportunamente a mujeres con lesiones tempranas asociadas al Virus del Papiloma Humano y en riesgo de desarrollar cáncer.OBJECTIVE: To evaluate whether serum antibodies anti-E4, E7 and Ras could be used as markers for early cervical lesions associated with HPV (human papillomavirus. MATERIAL AND METHODS: A seroepidemiological case-control study was conducted between March 1999 and April 2000 at the dysplasia clinic of Hospital General Doctor Gea Gonzalez, in Mexico City, to evaluate the presence of antibodies anti-E4, E7, and Ras through a sandwich ELISA. Analysis was done using odds ratios and 95% confidence intervals. RESULTS: Anti-E7 antibodies were associated to women with CIN III lesions, while anti-E4 and Ras antibodies were strongly associated with CIN I-II lesions. The antibody profile of women with different

  1. Nivel de corte de los ELISAs para cuantificación de anticuerpos inducidos por la vacuna antimeningocócica VA-MENGOC-BC

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    Rolando Ochoa

    2001-06-01

    Full Text Available Para medir el grado de protección inducido por vacunas antimeningocócicas se ha establecido el Ensayo Bactericida en Suero (EBS y se perfeccionan otros ensayos inmunobiológicos, sin embargo, es necesario contar con pruebas sencillas como el ELISA, capaz de evaluar un gran número de muestras. Se estimó el nivel de corte de los ELISAs para la cuantificación de IgG humana contra los antígenos de VA-MENGOC-BC, vacuna antimeningocócica compuesta por vesículas proteicas de membrana externa de meningococo B y polisacárido capsular de meningococo C, con respecto a un panel de muestras de suero de lactantes, caracterizado por Ensayo Bactericida en Sangre Total (EBST. Los valores correspondientes a la máxima sensibilidad y especificidad fueron respectivamente; 2 μg/mL y 12 μg/mL para antipolisacárido C, y 1000 U/mL y 7000 U/mL para antiproteínas de membrana externa. La mayor coincidencia se obtuvo con 6 μg/mL y 2500 U/mL. Se evaluó otro panel de muestras de suero de adolescentes entre 14 y 18 años, por ELISA y EBS para Neisseria meningitidis serogrupos B y C, alcanzándose una buena concordancia. Doce años después de la inmunización con VA-MENGOC-BC persiste una importante concentración de anticuerpos contra los antígenos vacunales en los sueros estudiados.

  2. Seroprevalencia de anticuerpos anti-Toxoplasma gondii en pacientes con afecciones Oncohematológicas

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    Dailín Cobos Valdes

    2009-01-01

    Full Text Available Se analiza la reactividad de 23 muestras de suero de pacientes con hemopatías malignas provenientes de la sala de hematología del Hospital Clínico Quirúrgico de Holguín, mediante la técnica de Inmunofluorescencia Indirecta, reportándose un 65,2% de seroprevalencia. La Toxoplasmosis es una enfermedad causada por el agente etiológico Toxoplasma gondii, parásito intracelular obligado ampliamente distribuido en todo el mundo y capaz de infectar un gran número de huéspedes, incluida la especie humana. Numerosas han sido las investigaciones sobre la presencia de anticuerpos anti- Toxoplasma gondii en individuos inmunodeficientes, donde los pacientes con enfermedades oncohematológicas son un grupo representativo dentro de esta población.

  3. El potencial de la inmunomodulación con anticuerpos monoclonales anti-CD137 (4-1BB para terapia de enfermedades malignas e infecciones virales crónicas The immunotherapy potential of agonistic anti-CD137 (4-1BB monoclonal antibodies for malignancies and chronic viral diseases

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    C. Alfaro

    2006-04-01

    Full Text Available La manipulación farmacológica del sistema inmunitario para conseguir respuestas linfocitarias de mayor intensidad tiene aplicación potencial en inmunoterapia tumoral y en el tratamiento de enfermedades virales crónicas. Los anticuerpos monoclonales inmunoestimuladores se definen como una familia de fármacos que aumentan la respuesta inmunitaria al interaccionar como ligandos artificiales con proteínas funcionales del sistema inmunitario, activando o inhibiendo su función. Hay anticuerpos monoclonales humanizados dirigidos frente al receptor inhibidor linfocitario CD152 (CTLA-4 que se están probando en ensayos clínicos con evidencia de actividad antitumoral, aunque con la contrapartida de producir reacciones autoinmunitarias severas. Los anticuerpos anti-CD137 tienen la capacidad de inducir potentes respuestas inmunitarias, mediadas principalmente por linfocitos T citotóxicos, con el resultado de erradicar tumores transplantables de ratón de forma comparativamente superior a los anticuerpos frente a CD152. CD137 (4-1BB es un antígeno de diferenciación expresado selectivamente en la superficie de linfocitos T y NK activados y sobre células dendríticas. Los anticuerpos monoclonales que actúan como ligandos artificiales estimuladores de este receptor (anticuerpos monoclonales agonistas anti-CD137 potencian la inmunidad celular antitumoral y antiviral en modelos experimentales murinos. Paradójicamente, estos mismos anticuerpos previenen o mejoran el curso de enfermedades autoinmunitarias establecidas en ratones como modelo. A la luz de estos datos experimentales, varios grupos de investigación han procedido a la humanización de anticuerpos dirigidos frente a CD137 humano y se plantea la inminente realización de los primeros ensayos clínicos.Pharmacological intervention on the immune system to achieve more intense lymphocyte responses has potential application in tumour immunology and in the treatment of chronic viral diseases

  4. Asociación entre anticuerpos antifosfolípidos y complicaciones de la gestación en mujeres de Costa Rica

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    Roubier Rojas-Barahona

    2007-04-01

    Full Text Available Objetivo: Determinar asociación entre los anticuerpos antifosfolípidos y complicaciones de la gestación (aborto de cualquier tipo, preeclampsia, eclampsia, insuficiencia placentaria grave o parto antes de la semana 34 de gestación, tomando como base la población de pacientes del servicio de Obstetricia del Hospital México. Materiales y métodos: Estudio de casos y controles en la población de pacientes atendidas por el servicio de Obstetricia del Hospital México en el período comprendido entre enero de 2002 y diciembre de 2004. Se tomaron los datos del registro de egresos Hospitalarios, se hizo un análisis descriptivo, en análisis univariado y multivariado de las principales variables registradas. Resultados: El promedio de edad de las pacientes en los casos y los controles no mostró diferencia significativa. La provincia de San José reporta el mayor porcentaje de casos con un 39.9%, seguido por Heredia con un 26.8% y Alajuela con un 24.6%. En cuanto al número de gestaciones, se determinó que no influyen significativamente en relación con el aborto y otras complicaciones de la gestación. El análisis univariado y multivariado mantiene asociación entre los antecedentes clínicos de las gestaciones anteriores, además de los anticuerpos antifosfolípidos respecto al aborto y otras complicaciones de la gestación. Conclusión: Los anticuerpos antifosfolípidos deberían ser tomados en cuenta como parte del seguimiento del embarazo en pacientes con historia de abortos y complicaciones de la gestación en embarazos previos.Aim: To determine the association between antiphospholipid antibodies and pregnancy failures (abortion, preclampsia, eclampsia, placental insufficiency or delivery before the 34th week of gestation in Costa Rican women. Materials and Methods: The present is a case-control study, the participants belong to the Obstetrics Department of the Hospital Mexico. The period of the study was from January 2002 to December

  5. Calidad de vida de los pacientes con inmunodeficiencias primarias de anticuerpos

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    Rodolfo Muriel-Vizcaíno

    2016-02-01

    análisis de covarianza. Se incluyeron 28 pacientes. La mediana de edad fue 5 años y 5 meses. Resultados: el promedio de edad al diagnóstico fue de 6 años con 3 meses. La mediana de retraso diagnóstico fue de 3 años 3 meses. El promedio de calidad de vida en los pacientes fue de 74.1 (DE ± 13.8 y de 83.3 (DE ± 10.1 para los controles (p = 0.005. La relación entre calidad de vida, retraso diagnóstico y presencia de complicaciones se analizó mediante un modelo lineal que fue marginalmente significativo (p = 0.056. Se encontró correlación negativa entre concentraciones de IgG en el último año y la calidad de vida. Se observó que, en los pacientes que presentaban bronquiectasias, conforme aumentan los años de retraso en el diagnóstico la calidad de vida disminuye de forma significativa (p = 0.007. Conclusiones: consideramos necesario evaluar la calidad de vida para conocer el estado de salud de los pacientes con inmunodeficiencias primarias y para su seguimiento durante el tratamiento con el objeto de incidir no sólo en la reducción del número de infecciones, hospitalizaciones y complicaciones, sino también en la mejoría de su calidad de vida. Deberá diseñarse un instrumento específico para evaluar la calidad de vida de los pacientes con inmunodeficiencias primarias.

  6. Urticaria crónica con alteraciones de la función tiroidea y anticuerpos antiperoxidasa tiroidea Chronic urticaria with alterations of the thyroid function and thyroid peroxidase antibodies

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    Diego S. Fernández Romero

    2005-06-01

    Full Text Available La urticaria crónica es una enfermedad frecuente, caracterizada por la presencia de ronchas y/o angioedema con una duración superior a las 6 semanas. En un número importante de pacientes se comporta como una enfermedad autoinmune asociada frecuentemente con alteraciones en la función tiroidea y con la presencia de anticuerpos antitiroideos. Presentamos una serie de 70 pacientes consecutivos con diagnóstico de urticaria crónica a los cuales les investigamos la función tiroidea y la presencia de anticuerpos antiperoxidasa tiroidea. Siete (10% tenían diagnóstico de enfermedad tiroidea previa al momento de la consulta. A los 63 pacientes restantes se les estudió los niveles de tirotrofina sérica, 11 de los cuales (17% presentaron valores anormales, que sumados a los 7 con enfermedad previa llegan a 18 (26% con función tiroidea alterada. A 61 pacientes se les investigó anticuerpos antiperoxidasa tiroidea, 22 (36% fueron positivos. De 57 pacientes sin diagnóstico de patología tiroidea previa al momento de la consulta por urticaria, a los que se les estudió tanto los niveles de tirotrofina sérica como la presencia de anticuerpos antiperoxidasa tiroidea, 24 (42% presentaron alguno de los estudios alterados. El alto porcentaje de alteraciones tiroideas en nuestra serie de pacientes resalta la necesidad de estudiar la función tiroidea y la presencia de anticuerpos antiperoxidasa tiroidea en pacientes con urticaria crónica.Chronic urticaria is a frequent pathology, characterized by the presence of hives and/or angioedema lasting longer than 6 weeks. In an important number of patients it behaves as an autoimmune illness, frequently associated with alterations in thyroid function and thyroid antibodies. We herein describe a consecutive series of 70 patients with a diagnosis of chronic urticaria. Seven (10% had a diagnosis of thyroid illness previous to their first consultation. Thyroid function and thyroid antibodies were studied in the

  7. Prevalencia de anticuerpos contra virus dengue en el cantón de Golfito (2005 y en el Distrito Central de Puntarenas (2005-2006, Costa Rica Dengue seroprevalence in Golfito and the central district of Puntarenas, Costa Rica 2005-2006

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    Margarita Lee-Lui

    2008-09-01

    Full Text Available Justificación y objetivo: La primo infección con el virus dengue varía desde asintomática hasta cuadros muy severos, como el dengue hemorrágico o el síndrome de choque por dengue. El Distrito Primero de Puntarenas ha sido una de las poblaciones más afectadas desde 1993, cuando aparecieron los primeros brotes, hasta hoy, con una disminución de la incidencia en los últimos años. La región Brunca fue la segunda en incidencia en el país en 1998, y si bien la endemicidad se ha mantenido, no existen estudios epidemiológicos sobre la prevalencia de esta enfermedad; los datos que aporta el Ministerio de Salud corresponden a la incidencia de casos clínicos en un período determinado. El objetivo de este estudio fue determinar la seroprevalencia en el Distrito Primero de Puntarenas y en Golfito para conocer la vulnerabilidad de la población de sufrir fiebre hemorrágica por dengue y analizar la situación asociada a los datos epidemiológicos de estas regiones, tales como edad, sexo y ubicación geográfica, ya que una población susceptible es la que presenta una alta seroprevalencia, unida a condiciones de hacinamiento y alta densidad vectorial. Métodos: El muestreo se realizó con el método EPI descrito por la OMS. Se recolectaron 210 muestras de suero en cada distrito, se desarrolló y estandarizó una prueba de ELISA de captura de antígeno para la detección de anticuerpos tipo IgG contra dengue, usando como referencia el método de reducción de placas de Dulbecco considerado estándar de oro. Resultados: La seroprevalencia contra dengue fue del 43.8% (92 y del 90% (189 en los distritos de Golfito y Central de Puntarenas, respectivamente, sin diferencias significativas respecto al sexo, la edad y la localidad. Se obtuvo un 83% y un 95% de correlación en Golfito y Puntarenas, respectivamente, entre los casos sintomáticos y la serología con el método estandarizado. Un 32% y un 42% del total de seropositivos en cada localidad

  8. Serum total IgG and IgG4 levels in thyroid eye disease

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    Sy A

    2016-10-01

    Full Text Available Aileen Sy, Rona Z Silkiss Department of Ophthalmology, California Pacific Medical Center, San Francisco, CA, USA Purpose: To investigate the relationship between immunoglobulin G (IgG4-related disease (IgG4-RD and thyroid eye disease (TED with respect to IgG levels. Patients and methods: A retrospective review of total IgG, IgG subclass, and thyroid stimulating immunoglobulin (TSI levels in 24 patients with TED. Results: Five patients (20.8% demonstrated serum IgG4 levels consistent with IgG4-RD without any additional systemic disease. Total IgG and IgG subclass levels were found to be an inadequate proxy for TSI elevation. Conclusion: There may be a subtype of TED patients with elevated IgG4 in the absence of IgG4-RD systemic findings. Keywords: thyroid eye disease, IgG subclass, IgG4, Graves’ disease, Graves’ ophthalmopathy, IgG4-RD

  9. IgG4-associated vasculitis.

    Science.gov (United States)

    Perez Alamino, Rodolfo; Martínez, Carlos; Espinoza, Luis R

    2013-08-01

    Elevated IgG4 is characteristic of cases of IgG4-RD, a newly recognized systemic disease. However, several chronic inflammatory conditions, including rheumatic diseases, can also be associated with increased levels of IgG4. There have also recently been several reports describing an increased IgG4 immune response to some vasculitis syndromes, in particular Churg-Strauss syndrome and granulomatosis with polyangiitis. To avoid misdiagnosis, clinicians must be aware that the clinical manifestations of IgG4-RD and ANCA-associated vasculitis may overlap. The meaning of these observations is not yet understood, and more studies are needed to determine the true significance of the increased IgG4 response to vasculitis syndromes, especially anti-neutrophil cytoplasmatic antibodies (ANCA)-associated vasculitis.

  10. IgG4 Related Sclerosing Cholangitis

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    D. Joshi

    2014-01-01

    Full Text Available IgG4 related disease (IgG4-RD is a multisystemic disorder which has only recently been recognized. IgG4 related sclerosing cholangitis (IgG4-SC is the biliary manifestation of the disease, often in association with autoimmune pancreatitis (AIP. In this review, we provide an overview of IgG4-RD, with a focus on the biliary manifestations. In particular, we describe the important differential diagnoses of IgG4-SC that need to be considered, namely, primary sclerosing cholangitis (PSC and cholangiocarcinoma, and provide a management algorithm. Finally, we highlight future directions and unanswered questions which will provide new insights into this exciting and evolving disease entity.

  11. Serum levels of IgG and IgG4 in Hashimoto thyroiditis.

    Science.gov (United States)

    Kawashima, Sachiko-Tsukamoto; Tagami, Tetsuya; Nakao, Kanako; Nanba, Kazutaka; Tamanaha, Tamiko; Usui, Takeshi; Naruse, Mitsuhide; Minamiguchi, Sachiko; Mori, Yusuke; Tsuji, Jun; Tanaka, Issei; Shimatsu, Akira

    2014-03-01

    Although IgG4-related disease is characterized by extensive infiltration of IgG4-positive plasma cells and lymphocytes of various organs, the details of this systemic disease are still unclear. We screened serum total IgG levels in the patients with Hashimoto thyroiditis (HT) to illustrate the prevalence of IgG4-related thyroiditis in HT. Twenty-four of 94 patients with HT (25.5%) had elevated serum IgG levels and their serum IgG4 was measured. Five of the 24 cases had more than 135 mg/dL of IgG4, which is the serum criterion of IgG4-related disease. One was a female patient who was initially treated as Graves' disease and rapidly developed a firm goiter and hypothyroidism. The biopsy of her thyroid gland revealed that follicular cells were atrophic with squamous metaplasia, replaced with fibrosis, which was compatible with the fibrous variant of HT. Immunohistochemical examination revealed diffuse infiltration of IgG4-positive plasma cells, and the serum IgG4 level was 179 mg/dL. The levels of IgG and IgG4 were positively correlated with the titers of anti-thyroglobulin antibody or anti-thyroid peroxidase antibody. In conclusion, at least a small portion of patients with HT with high titers of anti-thyroid antibodies may overlap the IgG4-related thyroiditis.

  12. IgG4-Related Disease without Overexpression of IgG4: Pathogenesis Implications

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    Naoshi Nishina

    2012-01-01

    Full Text Available IgG4-related disease is a new disease group that affects multiple organs. It is characterized by high serum IgG4 and abundant infiltration of IgG4-bearing plasma cells in the affected organ. Here, we describe an intriguing case that suggested that IgG4-related disease might present without IgG4 overexpression or infiltration, at least during a relapse. A 47-year-old man had been diagnosed with systemic lupus erythematosus 15 years. He was admitted due to a pituitary mass, systemic lymphadenopathy, and multiple nodules in the lungs and kidneys. The serum IgG4 level was normal and histopathological examination of the pituitary mass showed abundant lymphocyte and plasma cell infiltration with very few IgG4-positive cells. When we examined specimens preserved from 15 years ago, we found high serum IgG4 levels and IgG4-bearing plasma cell infiltration. This resulted in a diagnosis of IgG4-related disease, and we considered the current episode to be a relapse without IgG4 overexpression. This case indicated that, to clarify the pathogenesis of IgG4-related disease, current cases should repeat specimen evaluations over the course of IgG4-related disease to define diagnostic markers.

  13. Cutoff Values of Serum IgG4 and Histopathological IgG4+ Plasma Cells for Diagnosis of Patients with IgG4-Related Disease

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    Yasufumi Masaki

    2012-01-01

    Full Text Available IgG4-related disease is a new disease classification established in Japan in the 21st century. Patients with IgG4-related disease display hyper-IgG4-gammaglobulinemia, massive infiltration of IgG4+ plasma cells into tissue, and good response to glucocorticoids. Since IgG4 overexpression is also observed in other disorders, it is necessary to diagnose IgG4-related disease carefully and correctly. We therefore sought to determine cutoff values for serum IgG4 and IgG4/IgG and for IgG4+/IgG+ plasma cells in tissue diagnostic of IgG4-related disease. Patients and Methods. We retrospectively analyzed serum IgG4 concentrations and IgG4/IgG ratio and IgG4+/IgG+ plasma cell ratio in tissues of 132 patients with IgG4-related disease and 48 patients with other disorders. Result. Serum IgG4 >135  mg/dl demonstrated a sensitivity of 97.0% and a specificity of 79.6% in diagnosing IgG4-related disease, and serum IgG4/IgG ratios >8% had a sensitivity and specificity of 95.5% and 87.5%, respectively. IgG4+cell/IgG+ cell ratio in tissues >40% had a sensitivity and specificity of 94.4% and 85.7%, respectively. However, the number of IgG4+ cells was reduced in severely fibrotic parts of tissues. Conclusion. Although a recent unanimous consensus of all relevant researchers in Japan recently established the diagnostic criteria for IgG4-related disease, findings such as ours indicate that further discussion is needed.

  14. Optimización del ensayo vibriocida colorimétrico para la determinación de anticuerpos séricos contra V. cholerae del serogrupo O139

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    Joivier Vichi-Lozada

    2011-01-01

    Full Text Available El título de anticuerpos vibriocidas es reconocido actualmente como el mejor marcador de inmunidad protectora ante la infección con Vibrio cholerae. Su evaluación permite estudiar la efectividad de vacunas durante ensayos preclínicos y clínicos, a través de la determinación de la funcionalidad de anticuerpos séricos, capaces de lisar células en presencia de complemento exógeno. Se han desarrollado distintos ensayos bactericidas con puntos finales y métodos de determinación del título vibriocida diferentes. La presencia de cápsula en el serogrupo O139 de Vibrio cholerae constituye un impedimento para la lisis eficiente de las células bajo condiciones del ensayo vibriocida utilizado en cepas del serogrupo O1. Por tal razón, se hace necesario adaptar los ensayos bactericidas existentes para V. cholerae O1, con la finalidad de utilizarlos con el serogrupo O139. A partir de un ensayo vibriocida colorimétrico, desarrollado para el serogrupo O1, se optimizaron las condiciones necesarias para una eficiente lisis celular del serogrupo O139 por anticuerpos específicos y el complemento. Este método colorimétrico tiene la ventaja que mediante la adición de glucosa y un indicador de pH al medio de cultivo utilizado para el crecimiento de las células sobrevivientes, puede determinarse visualmente el título de forma clara e inequívoca. Los mejores resultados se obtuvieron después del crecimiento de la cepa diana en cuñas de agar LB, al usar una concentración inicial de vibrión diana de 106 UFC/mL, una concentración inicial del complemento de 100 %, disolución salina fisiológica como diluente y tiempo de reacción de vibriolisis de una hora. Estas condiciones de experimentación permitieron obtener resultados exactos y precisos para V. cholerae O139.

  15. Detección de anticuerpos Anti-brucella en focas de Weddell (Leptonychotes weddellii de Cabo Shirref, Antártica Detection of anti-brucella antibodies in Weddell seals (Leptonychotes weddellii from cape Shirref, Antarctica

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    O. BLANK

    2002-01-01

    Full Text Available Posterior al hallazgo de anticuerpos anti-Brucella en muestras de lobo fino antártico (Arctocephalus gazella, el estudio serológico en Pinnipedia Antárticos se continuó con el fin de determinar la presencia de anticuerpos anti-Brucella en otras especies. Se colectaron muestras de sangre y de fluido extravascular de 12 ejemplares de foca de Weddell (Leptonychotes weddellii encontrados en el Sitio de Especial Interés Científico (SEIC Nº 32 y sitio CCAMLR Ecosystem Monitoring Program (CEMP N° 2, "Cabo Shirreff e Islotes San Telmo" (62º 47' S; 60º 27' W, localizado en la costa Noroeste de la isla Livingston (Shetland del Sur, Antártica. Las muestras obtenidas fueron analizadas por la técnica convencional Rosa de Bengala (RB y dos inmunoensayos enzimáticos de competencia: Compelisa®, y c-ELISA. De las muestras estudiadas se identificaron cinco con anticuerpos anti-Brucella, siendo las pruebas inmunoenzimáticas las técnicas más sensibles. Estos resultados muestran una alta probabilidad de presencia de infección por una bacteria del género Brucella en ejemplares L. weddellii y plantean la necesidad de realizar estudios complementarios, que permitan conocer la etiología y entender la epidemiología de Brucella en esta región del mundoAfter the finding of anti-Brucella antibodies in samples of Antarctic fur seal (Arctocephalus gazella, the serological study on Antarctic Pinniped was continued in order to determine the presence of anti-Brucella antibodies in other species. Blood and extra vascular fluid samples were taken from 12 Weddell seals (Leptonychotes weddellii at the Site of Special Scientific Interest (SSSI Nº 32 and CCAMLR* Ecosystem Monitoring Program (CEMP site N° 2 "Cape Shirreff and San Telmo Islets" (62º 47' S; 60º 27' W, located on the Norwest coast Livingston Island (South Shetland Islands, Antarctica. The samples were tested by the conventional Rose Bengal test (RB and two competitive enzymatic immunoassay

  16. IgG4-related sclerosing disease

    Institute of Scientific and Technical Information of China (English)

    Terumi Kamisawa; Atsutake Okamoto

    2008-01-01

    Based on histological and immunohistochemical examination of various organs of patients with autoimmune pancreatitis (AIP), a novel clinicopathological entity of IgG4-related sclerosing disease has been proposed. This is a systemic disease that is characterized by extensive IgG4-positive plasma cells and T-lymphocyte infiltration of various organs. Clinical manifestations are apparent in the pancreas, bile duct, gallbladder, salivary gland, retroperitoneum, kidney, lung, and prostate, in which tissue fibrosis with obliterative phlebitis is pathologically induced. AIP is not simply pancreatitis but, in fact, is a pancreatic disease indicative of IgG4-related sclerosing diseases. This disease includes AIP, sclerosing cholangitis, cholecystitis, sialadenitis, retroperitoneal fibrosis, tubulointerstitial nephritis, interstitial pneumonia, prostatitis, inflammatory pseudotumor and lymphadenopathy, all IgG4-related. Most IgG4-related sclerosing diseases have been found to be associated with AIP, but also those without pancreatic involvement have been reported. In some cases, only one or two organs are clinically involved, while in others, three or four organs are affected. The disease occurs predominantly in older men and responds well to steroid therapy. Serum IgG4 levels and immunostaining with anti-IgG4 antibody are useful in making the diagnosis. Since malignant tumors are frequently suspected on initial presentation, IgG4-related sclerosing disease should be considered in the differential diagnosis to avoid unnecessary surgery.

  17. Anticuerpos anti 21 hidroxilasa séricos en pacientes con anticuerpos antifracción microsomal: Síndrome poliendocrino autoinmune Seric 21- hydroxilase antibodies in patients with anti-microsomal fraction antibodies: Autoimmune polyendocrine syndrome

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    Silvia Botta

    2007-04-01

    Full Text Available El síndrome poliendocrino autoinmune (SPA es la asociación de enfermedades endocrinas autoinmunes con otros desórdenes autoinmunes no endocrinos. Los tipos 1, 2 y 4 presentan adrenalitis autoinmune, esto indica la presencia de autoanticuerpos, y su marcador serológico específico es el anti 21 hidroxilasa (a21-OH. El SPA tipo 2 es la asociación de adrenalitis, enfermedad tiroidea y/o diabetes mellitus inducidas por autoanticuerpos. Como componentes menores, pueden estar asociados entre otros, vitiligo, alopecia y miastenia. Nuestros objetivos fueron: establecer la prevalencia de a21-OH séricos en pacientes con anticuerpos anti fracción microsomal (AFM positivos, enfermedad tiroidea autoinmune y/o afecciones endocrinas y no endocrinas autoinmunes; diagnosticar formas incompletas de SPA y estudiar individuos con probable riesgo de progresión a un SPA completo. Estudiamos 72 pacientes AFM positivos y 60 sujetos tomados como grupo control, AFM negativos. Hallamos a21-OH elevados en dos pacientes: A= 47 U/ml, hipotiroidismo autoinmune y miastenia; y B= 8.75 U/ml, hipotiroidismo autoinmune y vitiligo; ambos con ausencia de insuficiencia adrenal. La prevalencia de a21-OH encontrada fue del 2.8%. Las pacientes A y B corresponden a un SPA tipo 2 incompleto y latente en relación al componente adrenal. Considerando a los a21-OH marcadores de enfermedad autoinmune latente, el eventual riesgo de evolución hacia la afección clínica sugiere la necesidad de estrechos controles clínicos y bioquímicos periódicos.Autoimmune polyendocrine syndrome (APS is the association of autoimmune endocrine diseases, with other autoimmune nonendocrine disorders. APS types 1, 2 and 4 include autoimmune adrenalitis; this suggests the presence of autoantibodies. A specific serological marker for these is the anti 21- hydroxilase autoantibody (a21-OH. APS type 2 is the association of autoimmune adrenalitis, to autoimmune thyroid disease and/or diabetes mellitus, all

  18. Encefalitis por anticuerpos contra el receptor de NMDA: experiencia con seis pacientes pediátricos. Potencial eficacia del metotrexato

    Science.gov (United States)

    Bravo-Oro, Antonio; Abud-Mendoza, Carlos; Quezada-Corona, Arturo; Dalmau, Josep; Campos-Guevara, Verónica

    2016-01-01

    Introducción La encefalitis por anticuerpos contra el receptor de N-metil-D-aspartato (NMDA) es una entidad cada vez más diagnosticada en edad pediátrica. A diferencia de los adultos, en muchos casos no se asocia a tumores y las manifestaciones iniciales en niños más frecuentes son crisis convulsivas y trastornos del movimiento, mientras que en los adultos predominan las alteraciones psiquiátricas. Casos clínicos Presentamos seis casos pediátricos confirmados con anticuerpos contra la subunidad NR1 del receptor de NMDA en suero y líquido cefalorraquídeo. Cinco de los casos comenzaron con crisis convulsivas como manifestación clínica inicial antes de desarrollar el cuadro clásico de esta entidad. En todos los casos se utilizaron esteroides como primera línea de tratamiento, con los que sólo se observó control de las manifestaciones en uno, por lo que el resto de los pacientes requirió inmunomoduladores de segunda línea. Todos los pacientes recibieron metotrexato como tratamiento inmunomodulador para evitar recaídas y la evolución fue a la mejoría en todos ellos. Conclusiones En nuestra serie de pacientes con encefalitis por anticuerpos contra el receptor de NMDA, ninguno se asoció a tumores. Todos los casos recibieron metotrexato por lo menos durante un año, no observamos eventos adversos clínicos ni por laboratorio, ni hubo secuelas neurológicas ni recaídas durante el tratamiento. Aunque es una serie pequeña y es deseable incrementar el número y tiempo de evolución, consideramos el metotrexato una excelente alternativa como tratamiento inmunomodulador para esta patología. PMID:24150952

  19. IgG4-related prostatitis progressed from localized IgG4-related lymphadenopathy

    Science.gov (United States)

    Li, Dujuan; Kan, Yunzhen; Fu, Fangfang; Wang, Shuhuan; Shi, Ligang; Liu, Jie; Kong, Lingfei

    2015-01-01

    Immunoglobulin G4-related disease (IgG4-RD) is a recently described inflammatory disease involving multiple organs. Prostate involvement with IgG4-RD is very rare. In this report, we describe a case of IgG4-related prostatitis progressed from localized IgG4-related lymphadenopathy. This patient was present with urine retention symptoms. MRI and CT examination revealed the prostatic enlargement and the multiple lymphadenopathy. Serum IgG4 levels were elevated. Prostatic tissue samples resected both this time and less than 1 year earlier showed the same histological type of prostatitis with histopathologic and immunohistochemical findings characteristic of IgG4-RD. The right submandibular lymph nodes excised 2 years earlier were eventually proven to be follicular hyperplasia-type IgG4-related lymphadenopathy. This is the first case of IgG4-RD that began as localized IgG4-related lymphadenopathy and progressed into a systemic disease involving prostate and multiple lymph nodes. This patient showed a good response to steroid therapy. This leads us to advocate a novel pathogenesis of prostatitis, and a novel therapeutic approach against prostatitis. Pathologists and urologists should consider this disease entity in the patients with elevated serum IgG4 levels and the symptoms of prostatic hyperplasia to avoid ineffective medical or unnecessary surgical treatment. PMID:26617921

  20. POLYCLONAL ANTIBODIES TO DETECT THE CP-RT PROTEIN OF Potato Mop-Top VIRUS ANTICUERPOS POLICLONALES PARA LA DETECCIÓN DE LA PROTEÍNA CP-RT DEL Potato Mop-Top VIRUS

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    Derly Andrade Molina

    2012-06-01

    últiples submuestras por tejido bajo análisis. Con el fin de ampliar el rango de herramientas para la detección de PMTV, se obtuvieron anticuerpos dirigidos al dominio RT de la proteína CP-RT. Se secuenció dicho dominio en el aislamiento colombiano R25 de PMTV y se realizaron análisis bioinformáticos para ubicar regiones peptídicas con alto potencial inmunogénico. El péptido seleccionado fue inoculado en conejos para obtener anticuerpos, cuya utilidad fue evaluada a partir de pruebas de ELISA indirecto en plantas señuelo de Nicotiana benthamiana inoculadas con quistosoros de Sss y en plantas de papa obtenidas en La Unión (Antioquia. Estas pruebas estuvieron acompañadas con evaluaciones de RT-PCR. Se obtuvo la totalidad del dominio RT, así como 441 nt del gen CP. Los análisis filogenéticos identificaron la cepa R25 como asociada al linaje de PMTV mundialmente distribuido. Se obtuvieron 19,26 mg de anticuerpos, los que resultaron efectivos para detectar PMTV. Ya que CP-RT es responsable de la transmisión del PMTV por Sss, estos anticuerpos permitirán no sólo apoyar los programas de diagnóstico, sino también estudios básicos y epidemiológicos tendientes a evaluar las interacciones del PMTV y Sss.

  1. Anticuerpos séricos contra la enfermedad de Newcastle e Influenza Aviar en aves rapaces de Chile

    OpenAIRE

    Daniel González-Acuña; Álvaro Gaete; Lucila Moreno; Karen Ardiles; Fabiola Cerda-Leal; Christian Mathieu; René Ortega

    2012-01-01

    RESUMENObjetivo. Detectar la presencia de anticuerpos séricos sanguíneos contra los virus de la Enfermedad de Newcastle (ENC) e Influenza aviar (IA), para comprender la contribución de las aves silvestres en la transmisión de estos virus en Chile. Materiales y métodos. Se analizaron 63 aves pertenecientes a los órdenes Falconiformes y Strigiformes desde centros de rehabilitación de aves de las zonas central y sur de Chile. Se realizaron las pruebas de inhibición de la hemoaglutinación (IHA) p...

  2. Descripción de los anticuerpos, y manifestaciones clínicas de pacientes con polimiositis y dermatomiositis

    OpenAIRE

    Vega Castro, Kelly Patricia

    2014-01-01

    Introducción: La polimiositis y dermatomiositis, son enfermedades del grupo de miopatías inflamatorias, su curso es crónico, etiología autoinmune, tienen debilidad muscular simétrica de inicio proximal y la dermatomiositis se asocia a manifestaciones cutáneas. Genera importante situación de discapacidad física y emocional, costo social y económico elevado. La asociación de los anticuerpos circulantes con las manifestaciones clínicas, posibilidad de complicaciones y pronóstico ha tenido en los...

  3. Procedimiento para la obtención de anticuerpos monoclonales a partir de muestras complejas de antígenos

    OpenAIRE

    Fraile de Paz, Sofía; Zafra-Amorós, Olga; Jiménez, José Ignacio; Lorenzo Prieto, Víctor de

    2011-01-01

    La presente invención se refiere a un proceso de selección, en un solo paso, de dominios variables de anticuerpos, preferiblemente de camello, unidos a fagos, de gran afinidad y especificidad para un antígeno concreto o diversas proteínas que comparten epítopos comunes. Además el procedimiento incluye de forma preferente una amplificación de los fagos que comprenden los dominios variables de interés, mediante la infección de bacterias por dichos fagos, lo que permite la obtención de un elevad...

  4. Utilidad de las muestras de sangre total desecada en papel de filtro en la detección de anticuerpos antitoxoplasma

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    Joaquim Gascon

    1989-04-01

    Full Text Available Se compara la técnica de Aglutinación Directa (AD utilizando muestras de sangre total desecada en papel de filtro, con la técnica de ELISA y la misma AD utilizando muestras de suero de los mismos pacientes, para la detección de anticuerpos antitoxoplasma. Los resultados muestran la validez del método de la sangre desecada en papel de filtro para la detección de anticuerpos antitoxoplasma con la técnica de AD, y se considera su utilidad en los estudios epidemiológicos de campo.

  5. Prevalencia de anticuerpos contra Brucella sp. En donantes del banco de sangre de un hospital de Lima

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    Abel Ortega

    2007-10-01

    Full Text Available El Perú es un país endémico de Brucelosis, por lo que existe el riesgo de transmisión a través de sangre donada por no ser parte del tamizaje regular que realizan los bancos de sangre. Para conocer la prevalencia de anticuerpos contra Brucella en donantes del banco de sangre del Hospital Edgardo Rebagliati Martins, se analizó 1003 muestras de suero. La prueba tamiz fue Rosa de Bengala (RB; las muestras positivas fueron evaluadas por las pruebas de aglutinación en tubo (AT y 2-Mercaptoetanol (2-ME. Dos donantes fueron positivos a RB, confirmados por AT y 2-ME, se encontró una prevalencia de 0,20% (IC99%: 0,01-0,92. Se demostró la presencia de donantes portadores de anticuerpos contra Brucella con posible Brucelosis activa, evidenciándose la posibilidad de transmisión de esta infección. Se debe realizar mayores estudios con la finalidad de conocer la realidad de otros bancos de sangre.

  6. Detección de pepsinógeno mediante el uso de antisueros y anticuerpos monoclonales.

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    Oscar Orozco

    2000-02-01

    Full Text Available

    El pepsinógeno (PGA y PGC es una aspartato proteasa secretada por células principales gástricas que a pH ácido se convierte en pepsina. Los niveles séricos de dicha enzima se han postulado como indicadores del estado de la mucosa gástrica ya que dependiendo de la patología de base estos pueden encontrarse elevados o disminuidos. Así, en la gastritis superficial y úlcera duodenal los niveles de PGA se encuentran aumentados, mientras que en la gastritis atrófica y cáncer gástrico se encuentran disminuidos. Se planteó como objetivo de este trabajo producir anticuerpos policlonales y monoclonales anti-pepsinógeno con el fin de ser empleados en el diseño de sistemas de cuantificación de pepsinógeno sérico, ya que los sistemas de cuantificación comerciales son muy costosos y de difícil acceso. Para la producción de los anticuerpos se empleó pepsina A porcina como inmunógeno teniendo en cuenta que presenta una alta homología en la secuencia de aminoácidos (86% con la pepsina A humana y además tienen una estructura secundaria idéntica. Anticuerpos policlonales fueron obtenidos de conejos Nueva Zelanda inmunizados vía subcutánea con pepsina A porcina y los anticuerpos monoclonales a partir de células de bazo de los ratones BALB/c inmunizados con pepsina A vía intraperitoneal. Los anticuerpos tanto policlonales como monoclonales fueron purificados por precipitación con sulfato de amonio y posteriormente cromatografía de intercambio iónico a partir del suero o líquido ascítico respectivamente. Los anticuerpos purificados, tanto policlonales como monoclonales, son capaces de reconocer pepsina porcina y pepsinógeno humano presente en sonicados de biopsias gástricas en ensayos de ELISA y western blot. En ensayos de inmunohistoquímica realizados sobre cortes de biopsias gástricas los anticuerpos monoclonales detectan el pepsinógeno presente en el

  7. Anticuerpos monoclonales contra la Gonadotropina Corionica Humana (HCG y su empleo en el diagnóstico precoz del embarazo.

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    Torres E

    2006-03-01

    Full Text Available Se describe la obtención y caracterización de anticuerpos monoclonales contra la hormona gonadotropina cariónica humana (HCG, seleccionados de la inmunización subcutánea en ratones BALB/c. Se reporta también el desarrollo del sistema rápido HeberFast Line® Embarazo, para la detección de la hormona en muestras de orina, basado en los anticuerpos obtenidos y la tecnología del flujo lateral desarrollada en membranas de nitrocelulosa como soporte sólido. El nivel de sensibilidad alcanzado con este sistema diagnóstico es de 20 UI/L de HCG en muestra de orina, y no se observó reactividad cruzada en analitos similares conteniendo concentraciones de las glicohormonas relacionadas; 1000 IU de LH, 5000 IU de FSH, y 1000 µIU de TSH respectivamente. Los estudios de estabilidad arrojaron, que el diagnosticador mantine las características de funcionalidad por un tiempo de 15 meses a temperaturas entre 2 y 30 ºC, conformando este el tiempo de vigencia del sistema. De poseer en Farmacias, Consultorios Médicos de la Familia y Hospital Gineco-Obstétricos, un sistema rápido y sencillo como el establecido en este trabajo, se pueden evitar todos los riesgos e inconvenientes que acarrean los procesos de interrupción del embarazo en la mujer.

  8. Validación de un ensayo ELISA para la determinación de anticuerpos anti LPS de Vibrio Cholerae

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    Yadira Pino

    2003-03-01

    Full Text Available Para evaluar la respuesta inmunológica de cualquier candidato vacunal es necesario contar en el laboratorio con técnicas estandarizadas y validadas. Es por ello que en este trabajo se realizaron los ensayos para la estandarización del ELISA indirecto, usado para la determinación de anticuerpos séricos anti-LPS Ogawa contra cólera en suero de humanos inoculados por vía oral, así como la evaluación de los parámetros de validación típicos de este ensayo. Para la selección de las condiciones óptimas se evaluaron la concentración de recubrimiento, condiciones de bloqueo y dilución de conjugado, con el objetivo de seleccionar las mejores respuestas para el control positivo, el control negativo y el blanco en cada caso.Una concentración de 25 μg/mL de LPS Ogawa en PBS, como recubrimiento, durante toda la noche; leche descremada al 0,5% en PBS, 30 min a temperatura ambiente como bloqueo y el conjugado anti-IgA-HRP diluido 1:5000, resultaron las variables óptimas para el ensayo. En cuanto a la validación de la técnica los parámetros evaluados fueron precisión, exactitud, límite de detección, especificidad y robustez. Para ello se siguió un protocolo de validación que permitiera evaluarlos, y en todos los casos el ensayo se consideró adecuado, siempre y cuando el coeficiente de variación resultara ser menor del 20%. En todos los parámetros evaluados se cumplió con este requisito, considerando así los resultados confiables y reproducibles.

  9. Pathologies Associated with Serum IgG4 Elevation

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    Mikael Ebbo

    2012-01-01

    Full Text Available Statement of Purpose. IgG4-related disease (IgG4-RD is usually associated to an increase of serum IgG4 levels. However other conditions have also been associated to high serum IgG4 levels. Methods. All IgG subclasses analyses performed in our hospital over a one-year period were analyzed. When IgG4 level were over 1.35 g/L, the patient’s clinical observation was analyzed and both final diagnosis and reason leading to IgG subclasses analysis were recorded. Only polyclonal increases of IgG4 were considered. Summary of the Results. On 646 IgG subclass analysis performed, 59 patients had serum IgG4 over 1.35 g/L. The final diagnosis associated to serum IgG4 increase was very variable. Most patients (25% presented with repeated infections, 13.5% with autoimmune diseases, and 10% with IgG4-RD. Other patients presented with cancer, primary immune deficiencies, idiopathic interstitial lung disease, cystic fibrosis, histiocytosis, or systemic vasculitis and 13.5% presented with various pathologies or no diagnosis. Mean IgG4 levels and IgG4/IgG ratio were higher in IgG4-RD than in other pathologies associated to elevated IgG4 levels. Conclusions. Our study confirms that elevation of serum IgG4 is not specific to IgG4-RD. Before retaining IgG4-RD diagnosis in cases of serum IgG4 above 1.35 g/L, several other pathological conditions should be excluded.

  10. IgG4 related sclerosing mastitis: expanding the morphological spectrum of IgG4 related diseases.

    Science.gov (United States)

    Chougule, Abhijit; Bal, Amanjit; Das, Ashim; Singh, Gurpreet

    2015-01-01

    IgG4 related disease (IgG4RD) is a recently recognised condition characterised by mass forming lesions associated with storiform fibrosis, obliterative phlebitis, lymphoplasmacytic infiltrate rich in IgG4 positive plasma cells and elevated serum IgG4 levels. Although rare, mammary involvement has been reported as IgG4 related sclerosing mastitis, the morphological counterpart of a growing family of IgG4 related diseases. A total of 17 cases belonging to mass forming benign inflammatory breast lesions such as plasma cell mastitis, granulomatous lobular mastitis, non-specific mastitis and inflammatory pseudotumour were investigated as a possible member of IgG4 related sclerosing mastitis. Clinical, radiological, histopathological and immunohistochemistry findings were noted in all cases. Cases diagnosed as inflammatory pseudotumour showed all the histopathological features of IgG4RD along with increased number of IgG4 positive plasma cells and IgG4/IgG ratio >40%. However, only a few IgG4 positive cells were seen in plasma cell mastitis, granulomatous lobular mastitis and non-specific mastitis cases. These cases also did not fulfill the morphological criteria for the diagnosis of IgG4 related diseases. IgG4RD should be excluded in plasma cell rich lesions diagnosed on core biopsies by IgG4 immunostaining. This can avoid unnecessary surgery as IgG4 related diseases respond to simple and effective steroid treatment.

  11. Serum IgG subclasses in autoimmune diseases.

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    Zhang, Haoze; Li, Ping; Wu, Di; Xu, Dong; Hou, Yong; Wang, Qian; Li, Mengtao; Li, Yongzhe; Zeng, Xiaofeng; Zhang, Fengchun; Shi, Qun

    2015-01-01

    To characterize serum IgG subclass levels in several autoimmune diseases, including primary Sjogren syndrome (pSS), systemic sclerosis (SSc), systemic lupus erythematosus (SLE), and primary biliary cirrhosis (PBC). We aimed to analyze serum IgG subclass distribution and to test whether serum IgG4 levels are elevated in these diseases. Serum IgG subclass levels from 102 pSS, 102 SSc, 100 SLE, and 59 PBC patients, as well as 40 healthy controls (HCs), were measured using the immunonephelometric assay. The distribution of IgG subclasses among these autoimmune diseases was analyzed. In this cross-sectional study, serum IgG1 (IgG1/IgG) and/or IgG3 (IgG3/IgG) were significantly increased, compared with those in HCs. Only 6.34% of patients had levels of serum IgG4 >135 mg/dL. There were no significant differences in the frequency of elevated serum IgG4 levels between patients and HC. In pSS, serum IgG1 levels were much higher than those in other disease groups, whereas serum IgG2 and IgG3 levels were most prominently increased in PBC. A strikingly different serum IgG subclass distribution was detected in patients with autoimmune diseases compared with HCs. Serum IgG subclass levels also showed distinct characteristics among different autoimmune diseases. Serum IgG4 levels in these patients were lower or not much higher than those in HCs, which differed from IgG4-related diseases.

  12. SISTEMA INMUNE Y GENÉTICA:: UN ABORDAJE DIFERENTE A LA DIVERSIDAD DE ANTICUERPOS Immune System and Genetics:: A Different Approach to the Diversity of Antibodies

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    NUBIA ESTELA MATTA CAMACHO

    Full Text Available Es común encontrar en los libros de inmunología o de genética un capítulo con el título de -sistema inmune y genética-, sin embargo su asociación se centra en cómo la generación de anticuerpos rompió el paradigma -un gen, una proteína-, pues en el caso de la producción de anticuerpos, un gen produce millones de proteínas. El sistema inmune tiene muchos vínculos con la genética y la herencia; esta asociación se da porque cualquier sustancia o compuesto que produzca un organismo, es un antígeno potencial cuando es reconocido como extraño por el sistema inmune de otro organismo, sea este de la misma o de diferente especie. La producción de proteínas que potencialmente pueden ser antigénicas están ligadas al genotipo del individuo. La capacidad de responder y el tipo e intensidad de respuesta a antígenos también ha sido demostrado que están correlacionados con el genotipo del individuo en cuestión, así como deficiencias en las respuestas inmunes pueden estar asociadas con mutaciones o polimorfismos genéticos que resultan en la susceptibilidad a enfermedades infecciosas. Este manuscrito busca presentar ejemplos de la relación sistema inmune - genética, en la misma dirección de la conferencia ofrecida para la cátedra de Sede -Todo lo que usted quiere saber de genética y nunca se atrevió a preguntar-.It is common to find in immunology or genetic books a chapter entitled -immune system and genetics-; this association focuses on how the generation of antibodies broke the paradigm -one gene, one protein-, since in this case one gene generates millions of proteins. However, the immune system has many more links to genetics and heredity. For example, any substance or compound produced by an organism can be a potential antigen, when it is recognized as foreign by the immune system of another organism, belonging to the same or different species. The proteins, which are potentially antigenic are encoded by the individual s

  13. Seroprevalencia de anticuerpos contra el poliovirus 1 en niños mexicanos Seroprevalence of antibodies against poliovirus type 1 in Mexican children

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    Juan Ruiz-Gómez

    2007-01-01

    Full Text Available OBJETIVO: Analizar la frecuencia y distribución de la prevalencia de anticuerpos contra el virus de la poliomielitis tipo 1 en niños menores de 10 años en México, además de contribuir a la evaluación del programa de vacunación. MATERIAL Y MÉTODOS: Se estudió la presencia de anticuerpos contra el poliovirus tipo 1 en una muestra de la Encuesta Nacional de Salud 2000. Los sueros se recolectaron entre noviembre de 1999 y junio de 2000 a nivel nacional. La muestra constó de 6 270 niños de uno a nueve años de edad y se utilizó la técnica de neutralización. RESULTADOS: La seropositividad fue de 99.3% (IC95%99.1-99.7. Se identificaron como factores de riesgo de susceptibilidad el analfabetismo (RM= 1.5, p= 0.002 y el bajo ingreso familiar (RM= 1.4, p= 0.0487 y como factor protector el acceso a la seguridad social (RM= 0.41, p=0.04. CONCLUSIONES: Las actividades del programa de vacunación que han llevado a cabo las instituciones de salud han dado resultados en el control y eliminación de la enfermedad. Sin embargo, los programas de vacunación no deben interrumpirse, incluso si se ha registrado 99.3% de seropositividad; no puede soslayarse que al convertir el 0.7% restante, se calcula que hay 190 000 niños susceptibles de contraer la enfermedad. Estos niños se localizan sobre todo en el sur del país.OBJECTIVE: To analyze the frequency and distribution of the prevalence of antibodies against the poliomyelitis type 1 virus in children 1-9 years old in Mexico. MATERIAL AND METHODS: Antibodies against poliovirus type 1 (neutralization method were studied in 6 270 sera selected from the 24 232 sera from children one to nine years old, collected by the 2000 National Health Survey (ENSA 2000 that was conducted from November 1999 to June 2000. RESULTS: Overall seroprevalence was 99.3% (95%CI: 99.1-99.7. Using bivariate analysis, absence of antibodies was shown to be associated with illiteracy (OR= 1.5, p=0.002 and low household income (OR= 1

  14. Cholangiocarcinoma with respect to IgG4 Reaction

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    Kenichi Harada

    2014-01-01

    Full Text Available IgG4 reactions marked by infiltration of IgG4-positive plasma cells in affected organs occur in cancer patients and in patients with IgG4-related diseases. Extrahepatic cholangiocarcinomas including gall bladder cancer are often accompanied by significant IgG4 reactions; these reactions show a negative correlation with CD8-positive cytotoxic T cells, suggesting that the evasion of immune surveillance is associated with cytotoxic T cells. The regulatory cytokine IL-10 may induce IgG4-positive plasma cell differentiation or promote B cell switching to IgG4 in the presence of IL-4. Cholangiocarcinoma cells may function as nonprofessional antigen presenting cells that indirectly induce IgG4 reactions via the IL-10-producing cells and/or these may act as Foxp3-positive and IL-10-producing cells that directly induce IgG4 reactions. Moreover, IgG4-related disease is a high-risk factor for cancer development; IgG4-related sclerosing cholangitis (IgG4-SC cases associated with cholangiocarcinoma or its precursor lesion biliary intraepithelial neoplasia (BilIN have been reported. IgG4-positive cell infiltration is an important finding of IgG4-SC but is not a histological hallmark of IgG4-SC. For the diagnosis of IgG4-SC, its differentiation from cholangiocarcinoma remains important.

  15. DETECCIÓN DE ANTICUERPOS ANTI-Leishmania (Trypanosomatidae EN POBLACIONES CANINAS DEL DEPARTAMENTO DE SUCRE, COLOMBIA

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    Luís Enrique Paternina Tuirán

    2015-11-01

    Full Text Available RESUMENEl objetivo de la investigación fue determinar la prevalencia de anticuerpos anti-Leishmania en perros del departamento de Sucre, Colombia. Se analizaron 122 perros del área rural de los municipios de Ovejas, Sampués y Sincelejo, mediante la técnica de inmunofluorescencia indirecta (IFI. Anticuerpos anti-Leishmania fueron detectados en el 69,6 % (IC95 % = 61,1 – 78,2 de la población canina estudiada. En el municipio de Sincelejo la seropositividad fue del 72 % (IC95 % = 61,1 – 82,8, en el municipio de Sampués del 68,4 % (IC95 % = 52,3 – 84,5 y en el municipio de Ovejas del 55,5 % (IC95 % = 21,2 – 86,3. Los animales seropositivos fueron principalmente caninos jóvenes y adultos. El 17,6 % de los perros seropositivos mostró signos clínicos compatibles con leishmaniasis canina, entre los cuales la onicogrifosis, alopecia y caquexia fueron los más comunes. La alta frecuencia de caninos con anticuerpos a Leishmania detectada en el presente estudio, pone de manifiesto la hiperendemicidad de la leishmaniasis canina en esta zona del país, así como el alto riesgo de brotes epidémicos de la enfermedad.ABSTRACTThe aim of this survey was to determine prevalence of antibodies against Leishmania in dogs from Sucre, Colombia. We analyzed 122 dogs in rural areas from municipalities of Sampués, Ovejas and Sincelejo, by indirect immunofluorescence (IFA. Anti-Leishmania antibodies were detected in 69.6 % (95 % CI = 61.1 to 78.2 of the selected canine population. In the municipality of Sincelejo, Sampues and Ovejas, the seropositivities were 72 % (95 % CI = 61.1 to 82.8, 68.4 % (95 % CI = 52.3 to 84.5 and 55.5 % (95 % CI = 21.2 to 86.3 respectively. Seropositive animals were mainly young and adult dogs. The 17.6 % of seropositive dogs showed clinical signs compatible with canine leishmaniasis; onychogryphosis, alopecia and cachexia were the most common ones. The detected high frequency of canines with antibodies against Leishmania in the

  16. Heat sensitivity of porcine IgG.

    Science.gov (United States)

    Metzger, J J; Bourdieu, C; Rouze, P; Houdayer, M

    1975-09-01

    The sensitivity to heat of porcine IgG was studied. The serum from immunized pigs was heated at 56 degrees C for 30 min as for decomplementation. The elution pattern of the serum proteins on an agarose gel column showed a dramatic change with the appearance of a large peak of the gel-excluded material. This peak contained mainly IgG molecules which still retained its antibody activity. This fact points to misinterpretations which can easily occur in 7S and 19S antibody recognition during the porcine immune response. Correlation is suggested of this property with the large number of interheavy chain disulfide bridges present in porcine IgG.

  17. IgG Subclass Staining in Routine Renal Biopsy Material.

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    Hemminger, Jessica; Nadasdy, Gyongyi; Satoskar, Anjali; Brodsky, Sergey V; Nadasdy, Tibor

    2016-05-01

    Immunofluorescence staining plays a vital role in nephropathology, but the panel of antibodies used has not changed for decades. Further classification of immunoglobulin (Ig)G-containing immune-type deposits with IgG subclass staining (IgG1, IgG2, IgG3, and IgG4) has been shown to be of diagnostic utility in glomerular diseases, but their value in the evaluation of renal biopsies has not been addressed systematically in large renal biopsy material. Between January 2007 and June 2014, using direct immunofluorescence, we stained every renal biopsy for the IgG subclasses if there was moderate to prominent glomerular IgG staining and/or IgG-predominant or IgG-codominant glomerular staining. The total number of biopsies stained was 1084, which included 367 cases of membranous glomerulonephritis, 307 cases of lupus nephritis, 74 cases of fibrillary glomerulonephritis, 53 cases of proliferative glomerulonephritis with monoclonal IgG deposits, and 25 cases of antiglomerular basement membrane disease, among others. We found that monoclonality of IgG deposits cannot always be reliably determined on the basis of kappa and lambda light chain staining alone, particularly if concomitant (frequently nonspecific) IgM staining is present. In IgG heavy and heavy and light chain deposition disease (3 cases), subclass staining is very helpful, and in proliferative glomerulonephritis with monoclonal IgG deposits subclass staining is necessary. IgG subclass staining is useful in differentiating primary from secondary membranous glomerulonephritis. In proliferative glomerulonephritis with polyclonal IgG deposition, IgG1 dominance/codominance with concomitant IgG3 and IgG2 but weak or absent IgG4 staining favors an underlying autoimmune disease. IgG subclass staining is a very useful diagnostic method in a selected cohort of renal biopsies, particularly in biopsies with glomerulonephritis with monoclonal IgG deposits.

  18. Modelamiento del sistema inmune aviar para la optimización de la producción de anticuerpos específicos / Modelling of the avian immune system for the optimization of specific antibody production

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    Olarte Dussan, Fredy Andres

    2011-01-01

    Esta tesis presenta una metodología para optimizar la producción de anticuerpos específicos en aves. Anticuerpos (también conocidos como inmunoglobulinas) son herramientas biotecnológicas de gran valor usadas en investigación, diagnóstico y tratamiento. Usualmente, la producción de anticuerpos se realiza por medio de la inoculación en varias oportunidades de un animal con una concentración particular de un antígeno y la recolección de estas moléculas en las respuestas secundarias ...

  19. IgG4-Related Nasal Pseudotumor

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    L. K. Døsen

    2015-01-01

    Full Text Available IgG4-related disease is recognized as one form of autoimmune pancreatitis. During the last ten years, it has also been described in several other organs. We present two patients with lesions showing a histological picture of fibrosis and lymphoplasmacytic infiltrations with abundant IgG4 positive plasma cells at hitherto unreported symmetrical nasal locations. The symmetrical complex consisted of one central lesion in the anterior nasal septum and the two others in each of the lateral nasal walls. The lesions extended from the anterior part of the inferior concha into the vestibulum and caused severe nasal obstruction.

  20. Seroprevalencia de anticuerpos contra Moquillo canino en perros no vacunados en dos municipios de Ciudad de la Habana

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    Márquez Álvarez, Mario:

    2006-09-01

    Full Text Available Esto es el resumen de un trabajorealizado con el objetivo de determinarla presencia de anticuerpos séricoscontra Moquillo Canino en perros novacunados de dos municipios de Ciudadde la Habana, se estudiaron 117 canesmayores de 1 año de edad y con accesoa la calle, 51 del municipio Boyeros y 57del municipio Cotorro, que no contabancon antecedentes de vacunaciónanterior. Se estudiaron además 9animales vacunados recientemente quese utilizaron como controles positivos delestudio. Se tomaron datos referentes ala edad y sexo de los animales y seextrajeron muestras de sangre quefueron centrifugadas para la obtenciónde suero. Para la determinación deanticuerpos se empleó un ELISAestandarizado por la División deBiotecnología y Control de la Calidad delCentro Nacional para la Producción deAnimales de Laboratorio (Cuba. Lasplacas se leyeron en un lector SensidentScan a 414 nm. Se consideró como valorde corte el valor promedio de laDensidad Óptica del suero controlnegativo. La actividad de anticuerpos delas muestras se midió sobre la base delvalor de Densidad Óptica obtenidoconsiderando positivas todas las quepresentaron valores por encima del Valorde Corte. Se establecieron rangosagrupando los valores individuales enaltos, medios y bajos. Se comprobó queexiste una alta seroprevalencia deanticuerpos contra el virus en losmunicipios estudiados, con valores deDensidad Óptica en su mayoría incluidosdentro de los rangos medio y alto, lo queevidencia una amplia circulación delagente en el área, sin que se observarainfluencia del sexo, la edad de losanimales y el municipio de procedenciasobre la respuesta inmune observada.

  1. IgG4-Related Perineural Disease

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    Dai Inoue

    2012-01-01

    Full Text Available Aims. To elucidate characteristics of IgG4-related disease involving the peripheral nervous system. Methods. Retrospective review of 106 patients with IgG4-related disease identified 21 peripheral nerve lesions in 7 patients. Clinicopathological and radiological features were examined. Results. Peripheral nerve lesions were commonly identified in orbital or paravertebral area, involving orbital (=9, optic (=4, spinal (=7, and great auricular nerves (=1. The predominant radiological feature was a distinct perineural soft tissue mass, ranging 8 to 30 mm in diameter. Histologically, the epineurium was preferentially involved by massive lymphoplasmacytic infiltration rich in IgG4+ plasma cells. All lesions were neurologically asymptomatic and steroid-responsive at the first presentation, but one recurrent lesion around the optic nerve caused failing vision. Conclusion. IgG4-related disease of the peripheral nervous system is characterized by orbital or paravertebral localization, perineural mass formation, and rare neurologic symptoms. The term “IgG4-related perineural disease” seems appropriate to describe this entity.

  2. IgG4 Related Lung Disease

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    Mihir Patel

    2016-01-01

    Full Text Available IgG4 related disease is a poorly understood immune mediated condition. Lung involvement is rare and difficult to diagnose and can mimic primary lung malignancy on imaging. A patient who was found to have an incidental lung lesion with risk factors for primary pulmonary malignancy is reported.

  3. IgG4-associated cholangitis.

    Science.gov (United States)

    Nath, Vikas; Lewin, Jack; Subramony, Charu; Shenoy, Veena

    2014-12-01

    We report a young female patient with IgG4-associated cholangitis (IAC) who presented with common bile duct (CBD) stricture and review the features that distinguish IAC from both primary sclerosing cholangitis (PSC) and other types of secondary sclerosing cholangitis (SSC). IAC is a biliary manifestation of IgG4-related sclerosing disease, an autoimmune condition characterized by elevated serum IgG4 and infiltrates containing lymphocytes and IgG4-positive plasma cells, accompanied by sclerosis. On endoscopic retrograde cholangiopancreatography, IAC consists of segmental biliary strictures with a predilection for the distal CBD, whereas in PSC the strictures are more band-like; other types of SSC often demonstrate unifocal ductal obstructions, sometimes associated with choleliths. On histologic examination, the bile duct wall in IAC contains a denser lymphocytic infiltrate and sparser sclerosis than in PSC; other types of SSC can be distinguished histologically by the types of inflammatory cells present. Unlike those of PSC, IAC-related strictures are reversible with corticosteroids.

  4. Prevalencia de anticuerpos contra diarrea viral bovina, virus sincitial bovino, rinotraqueitis infecciosa bovina, leucosis bovina, Neospora caninum, parainfluenza bovina (PI3 y paratuberculosis, en ganadería bovina de fincas ubicadas en Aguachica y Rio de Oro, Cesar

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    Tatiana Gálvis García

    2016-06-01

    Full Text Available Introducción: En el área de la ganadería los problemas caracterizados por infertilidad, abortos, muerte embrionaria, crías con malformaciones neurológicas y físicas son de gran importancia, ya que hay múltiples etiologías y se encuentran ampliamente distribuidos a nivel mundial. Lo anterior ocasiona serias pérdidas económicas y afectando la exportación de carne de los bovinos debido a la restricción de normas de sanidad, donde se encuentran las enfermedades como diarrea viral bovina, rinotraqueitis infecciosa bovina, leucosis bovina y Neospora caninum. Objetivo: Determinar la prevalencia de anticuerpos contra diarrea viral bovina (DVB, virus sincitial respiratorio bovino (BRSV, virus de la rinotraqueitis infecciosa bovina (IBR, leucosis enzoótica bovina (BLV, N. caninum, Parainfluenza bovina (PI3 y paratuberculosis (ParaTBC, en bovinos de Aguachica y Rio de Oro, Cesar. Materiales y métodos: Tipo de estudio: Descriptivo de corte transversal, se realizó en 27 fincas ubicadas en zona rural de los municipios de Aguachica y Rio de Oro, Cesar. El Tamaño de la muestra se estimó en 905 bovinos. De cada animal se tomó sangre por punción venosa de la vena coccígea en tubos sin anticoagulante mediante el uso de sistema de vacío Vacutainer®. Cada muestra fue etiquetada adecuadamente con los códigos de identificación asignada, las muestras se centrifugaron a 1500 rpm y se transportó al laboratorio en recipientes con hielo. Se realizó alícuotas en viales de 1,5 ml y se almacenaron a -20 ° C para su posterior procesamiento. Determinación de anticuerpos específicos: Las pruebas para detectar anticuerpos específicos fue mediante ensayo de inmunoabsorción enzimática (ELISA, de las casas comerciales INGEZIM (BRSV, DBV, BLV, N. caninum, IBR, PARACHEK 2 (ParaTBC y BIO-X DIAGNOSTIC (PI3. La validación de las pruebas se realizó mediante los respectivos controles positivos y negativos los cuales se procesaron por duplicado. Resultados

  5. IgG abnormality in narcolepsy and idiopathic hypersomnia.

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    Susumu Tanaka

    Full Text Available BACKGROUND: A close association between narcolepsy and the Human Leukocyte Antigen (HLA-DQB1*0602 allele suggests the involvement of the immune system, or possibly an autoimmune process. We investigated serum IgG levels in narcolepsy. METHODOLOGY/PRINCIPAL FINDINGS: We measured the serum total IgG levels in 159 Japanese narcolepsy-cataplexy patients positive for the HLA-DQB1*0602 allele, 28 idiopathic hypersomnia patients with long sleep time, and 123 healthy controls (the HLA-DQB1*0602 allele present in 45 subjects. The serum levels of each IgG subclass were subsequently measured. The distribution of serum IgG was significantly different among healthy controls negative for the HLA-DQB1*0602 allele (11.66+/-3.55 mg/ml, healthy controls positive for the HLA-DQB1*0602 allele (11.45+/-3.43, narcolepsy patients (9.67+/-3.38, and idiopathic hypersomnia patients (13.81+/-3.80. None of the following clinical variables, age, disease duration, Epworth Sleepiness Scale, smoking habit and BMI at the time of blood sampling, were associated with IgG levels in narcolepsy or idiopathic hypersomnia. Furthermore we found the decrease in IgG1 and IgG2 levels, stable expression of IgG3, and the increase in the proportion of IgG4 in narcolepsy patients with abnormally low IgG levels. The increase in the proportion of IgG4 levels was also found in narcolepsy patients with normal serum total IgG levels. Idiopathic hypersomnia patients showed a different pattern of IgG subclass distribution with high IgG3 and IgG4 level, low IgG2 level, and IgG1/IgG2 imbalance. CONCLUSIONS/SIGNIFICANCE: Our study is the first to determine IgG abnormalities in narcolepsy and idiopathic hypersomnia by measuring the serum IgG levels in a large number of hypersomnia patients. The observed IgG abnormalities indicate humoral immune alterations in narcolepsy and idiopathic hypersomnia. Different IgG profiles suggest immunological differences between narcolepsy and idiopathic hypersomnia.

  6. IgG4-related Disease of the Genitourinary Tract

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    Mukul K. Divatia

    2014-02-01

    Full Text Available IgG4-related disease (IgG4-RD is a recently established albeit well recognized fibro-inflammatory condition with distinctive features including a characteristic histopathological appearance; a propensity to develop tumefactive lesions in multiple body sites; and oft elevated serum IgG4 levels. The consensus statement on IgG-4 RD equips practicing pathologists with a set of working guidelines for the diagnosis of pathologic lesions identified in a host of different organ system affected with this disease. The diagnosis of IgG4-RD requires the combined presence of the characteristic histopathological appearance and increased numbers of IgG4-positive plasma cells. The essential histopathological features include a dense lymphoplasmacytic infiltrate, a storiform pattern of fibrosis, and obliterative phlebitis. Tissue IgG4-positive plasma cell counts and IgG4: IgG ratios are significant ancillary aids in establishing the diagnosis. The spectrum of IgG4-RD continues to expand and involve multiple body sites. The genitourinary system comprising of the kidneys, ureters, urinary bladder, urethra, prostate gland, testes and penis is one of the multiple organ systems to be affected by IgG4-RD. This review describes the clinical and histopathologic patterns of involvement of the genitourinary system by IgG4-RD, in association with serologic and radiological features. [J Interdiscipl Histopathol 2014; 2(1.000: 3-18

  7. IgG4-related pleuritis with chylothorax.

    Science.gov (United States)

    Kato, Eisuke; Takayanagi, Noboru; Ishiguro, Takashi; Kagiyama, Naho; Shimizu, Yoshihiko; Sugita, Yutaka

    2014-01-01

    Presently, 6 cases of IgG4-related pleuritis have been reported. We encountered a patient who developed chylothorax due to IgG4-related disease. To our knowledge, such patients have not been reported. This patient developed right-sided chylothorax and left-sided non-chylothorax lymphocyte-predominant pleuritis. Elevated serum and pleural IgG4 concentrations and histopathological analysis of pleural biopsy confirmed the diagnosis of IgG4-related pleuritis. Left-sided pleuritis improved with corticosteroid therapy, but right-sided chylothorax persists. IgG4-related disease can be one cause of chylothorax.

  8. Detection of serum IgG4 levels in patients with IgG4-related disease and other disorders.

    Directory of Open Access Journals (Sweden)

    Yuying Su

    Full Text Available Elevated serum IgG4 levels are an important hallmark for diagnosing IgG4-related disease (IgG4-RD, but can also be observed in other diseases. This study aimed to compare two different testing methods for IgG4: ELISA and nephelometric assay. Both assays were used to measure serum IgG4 concentrations, and to assess the prevalence of high serum IgG4 levels in both IgG4-RD and non-IgG4-RD diseases.A total of 80 serum samples were tested using the nephelometric assay and ELISA method that we established. Serum IgG4 concentrations were determined by ELISA for 957 patients with distinct diseases, including 12 cases of IgG4-RD and 945 cases of non-IgG4-RD.IgG4 levels from 80 selected serum samples examined by ELISA were in agreement with those detected using the nephelometry assay. Meanwhile, the serum IgG4 concentrations measured by ELISA were also consistent with the clinical diagnoses of patients with IgG4-RD during the course of disease. The Elevated levels of serum IgG4 (>1.35 g/L were detected in all IgG4-RD (12/12 patients, and the prevalence of high IgG4 serum levels was 3.39% in non-IgG4-RD cases. Among them, the positive rates of serum IgG4 were 2.06% in patients with carcinoma and 6.3% in patients with other non-IgG4 autoimmune diseases.Our established ELISA method is a reliable and convenient technique, which could be extensively used in the clinic to measure serum IgG4 levels. High levels of IgG4 were observed in IgG4-RD. However, this phenomenon could also be observed in other diseases, such as carcinomas and other autoimmune diseases. Thus, a diagnosis of IgG4 disease cannot only be dependent on the detection of elevated serum IgG4 levels.

  9. Prevalencia de anticuerpos contra Trypanosoma cruzi en donadores de sangre del IMSS, Orizaba, Veracruz, México

    Directory of Open Access Journals (Sweden)

    Ramos-Ligonio Angel

    2006-01-01

    Full Text Available OBJETIVO: Determinar la prevalencia de anticuerpos contra Trypanosoma cruzi en donadores del Hospital General Regional del Instituto Mexicano del Seguro Social (IMSS en la ciudad de Orizaba, Veracruz. MATERIAL Y MÉTODOS: Se examinaron muestras de donadores del banco de sangre del Hospital General Regional (HGRO del IMSS para la búsqueda de antiT. cruzi por ELISA, Western blot e IFI, utilizando una proteína recombinante (MBP::Hsp70 y un extracto crudo de epimastigotes. Las muestras fueron obtenidas entre los meses de octubre de 2001 a enero de 2002. RESULTADOS: Los 420 donadores de sangre analizados fueron seronegativos para HBV, HCV, BrA, VDRL y HIV. Después del tamizaje de los 420 donadores, se identificaron dos individuos seropositivos por las pruebas de ELISA, Western blot e IFI, con una seroprevalencia de 0.48%. CONCLUSIONES: En este estudio se muestran evidencias de seropositividad para T. cruzi en donadores de sangre del HGRO, lo que sugiere la existencia de riesgo de contaminación por transfusión sanguínea. Por tal motivo, es necesario aplicar programas para el tamizaje serológico a través de técnicas inmunológicas con alta sensibilidad y especificidad.

  10. Phase transitions in human IgG solutions.

    Science.gov (United States)

    Wang, Ying; Lomakin, Aleksey; Latypov, Ramil F; Laubach, Jacob P; Hideshima, Teru; Richardson, Paul G; Munshi, Nikhil C; Anderson, Kenneth C; Benedek, George B

    2013-09-28

    Protein condensations, such as crystallization, liquid-liquid phase separation, aggregation, and gelation, have been observed in concentrated antibody solutions under various solution conditions. While most IgG antibodies are quite soluble, a few outliers can undergo condensation under physiological conditions. Condensation of IgGs can cause serious consequences in some human diseases and in biopharmaceutical formulations. The phase transitions underlying protein condensations in concentrated IgG solutions is also of fundamental interest for the understanding of the phase behavior of non-spherical protein molecules. Due to the high solubility of generic IgGs, the phase behavior of IgG solutions has not yet been well studied. In this work, we present an experimental approach to study IgG solutions in which the phase transitions are hidden below the freezing point of the solution. Using this method, we have investigated liquid-liquid phase separation of six human myeloma IgGs and two recombinant pharmaceutical human IgGs. We have also studied the relation between crystallization and liquid-liquid phase separation of two human cryoglobulin IgGs. Our experimental results reveal several important features of the generic phase behavior of IgG solutions: (1) the shape of the coexistence curve is similar for all IgGs but quite different from that of quasi-spherical proteins; (2) all IgGs have critical points located at roughly the same protein concentration at ~100 mg/ml while their critical temperatures vary significantly; and (3) the liquid-liquid phase separation in IgG solutions is metastable with respect to crystallization. These features of phase behavior of IgG solutions reflect the fact that all IgGs have nearly identical molecular geometry but quite diverse net inter-protein interaction energies. This work provides a foundation for further experimental and theoretical studies of the phase behavior of generic IgGs as well as outliers with large propensity to

  11. Development of an IgG4-RD Responder Index

    Directory of Open Access Journals (Sweden)

    Mollie N. Carruthers

    2012-01-01

    Full Text Available IgG4-related disease (IgG4-RD is a multiorgan inflammatory disease in which diverse organ manifestations are linked by common histopathological and immunohistochemical features. Prospective studies of IgG4-RD patients are required to clarify the natural history, long-term prognosis, and treatment approaches in this recently recognized condition. Patients with IgG4-RD have different organ manifestations and are followed by multiple specialties. Divergent approaches to the assessment of patients can complicate the interpretation of studies, emphasizing the critical need for validated outcome measures, particularly assessments of disease activity and response to treatment. We developed a prototype IgG4-RD Responder Index (IgG4-RD RI based on the approach used in the development of the Birmingham Vasculitis Activity Score for Wegener’s granulomatosis (BVAS/WG. The IgG4-RD RI was refined by members of the International IgG4-RD Symposium Organizing Committee in a paper case exercise. The revised instrument was applied retrospectively to fifteen IgG4-RD patients at our institution. Those scores were compared to physician’s global assessment scale for the same visits. This paper describes the philosophy and goals of the IgG4-RD RI, the steps in the development of this instrument to date, and future plans for validation of this instrument as an outcome measure.

  12. IgG from Amyotrophic Lateral Sclerosis Patients Increases Current Through P-Type Calcium Channels in Mammalian Cerebellar Purkinje Cells and in Isolated Channel Protein in Lipid Bilayer

    Science.gov (United States)

    Llinas, R.; Sugimori, M.; Cherksey, B. D.; Smith, R. Glenn; Delbono, O.; Stefani, E.; Appel, S.

    1993-12-01

    The effect of the IgG from amyotrophic lateral sclerosis (ALS) patients was tested on the voltage-dependent barium currents (IBa) in mammalian dissociated Purkinje cells and in isolated P-type calcium channels in lipid bilayers. Whole cell clamp of Purkinje cells demonstrates that ALS IgG increases the amplitude of IBa without modifying their voltage kinetics. This increased IBa could be blocked by a purified nonpeptide toxin from Agelenopsis aperta venom (purified funnel-web spider toxin) or by a synthetic polyamine analog (synthetic funnel-web spider toxin) and by a peptide toxin from the same spider venom, ω-Aga-IVA. Similar results were obtained on single-channel recordings from purified P channel protein. The addition of ALS IgG increased single-channel IBa open time without affecting slope conductance. The results described above were not seen with normal human IgG nor with boiled ALS IgG. It is concluded that ALS IgG enhances inward current through P-type calcium channels. Since P-type Ca2+ channels are present in motoneuron axon terminals, we propose that the enhanced calcium current triggered by ALS IgG may contribute to neuronal damage in ALS.

  13. Fractionation of rat IgG subclasses and screening for IgG Fc-binding to bacteria.

    Science.gov (United States)

    Nilsson, R; Myhre, E; Kronvall, G; Sjögren, H O

    1982-01-01

    The four IgG subclasses of the rat, IgGl, IgG2a, IgG2b and IgG2c, were purified from normal serum by a combination of protein A-affinity chromatography and DEAE-cellulose chromatography. Purified, radiolabelled preparations of IgG were tested for binding to Gram-positive bacteria representing five different Fc-receptor (FcR) types. Distinct rat subclass-specific Fc-binding was noted to bacterial species belonging to different Fc-receptor types. Staphylococcus aureus (FcR I) strains bind IgGl and IgG2c as shown by others. Group C and G Streptococci (FcR III) bind all four subclasses of rat IgG. Streptococcus zooepidemicus strains (FcR V) also bind all four subclases but only to a lower degree. Human group A Streptococci (FcR II) and bovine group G Streptococci (FcR IV) do not bind any of the rat IgG subclasses. Elution studies on two strains. Staphylococcus aureus, Cowan I, and human group G Streptococcus, G 148, showed that both thiocyanate and pH-elution might be useful for the fractionation of IgG subclasses bound to bacterial cells. The present work indicates the possible use of bacterial cells as solid-phase absorbents in immunological studies of rat IgG.

  14. Highly immunoreactive IgG antibodies directed against a set of twenty human proteins in the sera of patients with amyotrophic lateral sclerosis identified by protein array.

    Directory of Open Access Journals (Sweden)

    Caroline May

    Full Text Available Amyotrophic lateral sclerosis (ALS, the most common adult-onset motor neuron disorder, is characterized by the progressive and selective loss of upper and lower motor neurons. Diagnosis of this disorder is based on clinical assessment, and the average survival time is less than 3 years. Injections of IgG from ALS patients into mice are known to specifically mark motor neurons. Moreover, IgG has been found in upper and lower motor neurons in ALS patients. These results led us to perform a case-control study using human protein microarrays to identify the antibody profiles of serum samples from 20 ALS patients and 20 healthy controls. We demonstrated high levels of 20 IgG antibodies that distinguished the patients from the controls. These findings suggest that a panel of antibodies may serve as a potential diagnostic biomarker for ALS.

  15. Epitope-Specific Suppression of IgG Responses by Passively Administered Specific IgG: Evidence of Epitope Masking

    Science.gov (United States)

    Bergström, Joakim J. E.; Xu, Hui; Heyman, Birgitta

    2017-01-01

    Specific IgG, passively administered together with particulate antigen, can completely prevent induction of antibody responses to this antigen. The ability of IgG to suppress antibody responses to sheep red blood cells (SRBCs) is intact in mice lacking FcγRs, complement factor 1q, C3, or complement receptors 1 and 2, suggesting that Fc-dependent effector functions are not involved. Two of the most widely discussed explanations for the suppressive effect are increased clearance of IgG–antigen complexes and/or that IgG “hides” the antigen from recognition by specific B cells, so-called epitope masking. The majority of data on how IgG induces suppression was obtained through studies of the effects on IgM-secreting single spleen cells during the first week after immunization. Here, we show that IgG also suppresses antigen-specific extrafollicular antibody-secreting cells, germinal center B-cells, long-lived plasma cells, long-term IgG responses, and induction of memory antibody responses. IgG anti-SRBC reduced the amount of SRBC in the spleens of wild-type, but not of FcγR-deficient mice. However, no correlation between suppression and the amount of SRBC in the spleen was observed, suggesting that increased clearance does not explain IgG-mediated suppression. Instead, we found compelling evidence for epitope masking because IgG anti-NP administered with NP-SRBC suppressed the IgG anti-NP, but not the IgG anti-SRBC response. Vice versa, IgG anti-SRBC administered with NP-SRBC, suppressed only the IgG anti-SRBC response. In conclusion, passively transferred IgG suppressed all measured parameters of an antigen-specific antibody/B cell response and an important mechanism of action is likely to be epitope masking.

  16. IgG subclasses in human chronic schistosomiasis: over-production of schistosome-specific and non-specific IgG4.

    Science.gov (United States)

    Boctor, F N; Peter, J B

    1990-12-01

    IgG subclasses were determined quantitatively in sera from 63 Egyptian men who were infected with Schistosoma mansoni. Total and antigen-specific IgG was measured pre- and post-treatment. Total IgG subclass antibodies were determined by immunoradiometric assay (IRMA) using monoclonal antibodies (MoAbs). The anti-worm and anti-egg specific S. mansoni IgG subclass antibodies were quantitatively measured by ELISA using specific MoAbs and standards obtained by affinity chromatography. Our data show that total IgG of the patients was elevated in the range of two to three times above normal. The magnitude of increase differed markedly among the four subclasses of IgG. The IgG1, IgG2 and IgG3 concentrations were approximately two to four times higher than normal, whereas the IgG4 concentrations was 20 times normal (9000 mg/l). IgG1 and IgG4 tended to dominate the IgG subclass distribution of anti-soluble worm antigen preparation (SWAP) antibodies followed by IgG2 and IgG3. On the other hand, IgG1 and IgG2 dominated the IgG subclass distribution of anti-soluble egg antigen (SEA) antibodies. As with IgG1, IgG2 and IgG3, most IgG4 was non-specific. The role of IgG subclasses in the pathogenesis of schistosomiasis is not clear. However, the high concentration of IgG4 might act as IgE blocking antibody, possibly as anti-idiotypes that may play a role in down-regulation of the immune system when it is challenged with an excess of antigen.

  17. IgG4 Inflammatory Pseudotumor of the Kidney

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    Ahmed N. Alkhasawneh

    2012-01-01

    Full Text Available Hyper-IgG4 disease is a rare systemic disorder that usually affects middle age males. It is characterized by elevated serum IgG4 levels and infiltration of organs by IgG4 positive plasma cells associated with fibrosis. Patients usually present with mass or masses in the involved organ that mimic neoplasia. While initially described in the pancreas, IgG4-related inflammatory tumors have been now described in many organs. We describe an unusual case of an IgG4-related pseudotumor of the kidney.

  18. Presencia de anticuerpos sericos contra Neospora caninum en equinos en Chile Sera antibodies to Neospora caninum in Chilean horses

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    A.N. Patitucci

    2004-12-01

    Full Text Available Neospora sp. es un parásito protozoario causante de abortos y/o enfermedad del Sistema Nervioso Central (SNC en caninos, bovinos, ciervos, caprinos, ovinos, equinos y otros. En equinos, se lo ha involucrado como causa de aborto, mortalidad neonatal y enfermedades del SNC y viscerales. La especie que infecta a los equinos es distinta a Neospora caninum y se denomina Neospora hughesi. En Chile no existe evidencia de infección en equinos, sin embargo, la enfermedad ha sido informada en bovinos y caninos, por lo que el objetivo de este trabajo fue buscar anticuerpos contra la enfermedad en sueros equinos . Para ello se tomaron muestras de sangre a 145 equinos (87 de la IX Región y 58 de la VIII Región de Chile. Los sueros fueron analizados mediante Test de Aglutinación para Neospora (NAT. Cada suero se diluyó en 1:40 en solución salina tamponada (PBS pH 7.2 conteniendo 2- mercaptoetanol y fueron analizados en 1:40 y 1:80. Los sueros positivos a 1:80 fueron examinados a 1:160 y 1:320. Anticuerpos contra N.caninum (≥ 1:40 se encontraron en 32% (47/145 de los equinos estudiados. Debido a que N.caninum y N.hughesi dan reacción cruzada, ambos o uno de ellos podrían ser los responsables de la seropositividad. Estos resultados indican que equinos provenientes de la VIII y IX regiones de Chile son reaccionantes a la infección de Neospora, por lo que su diagnóstico presuntivo debería ser considerados ante la presencia de cuadros clínicos con sintomatología nerviosa y/o abortos en esta especie.Neospora caninum is a protozoan parasite that affects cattle and dogs, its infections seem to be widely prevalent in Chile. To date, nothing is known of the presence of N. caninum in horse population of the country. In South America, two seroprevalence studies have failed to find antibodies in Argentina and Brazil. The objective of the study was to investigate the presence of N. caninum exposure in horses of Chile. Sera from 145 asymptomatic horses (87

  19. DETECCIÓN DE ANTICUERPOS IgM A LEPTOSPIRA EN HUMANOS EN RIESGO OCUPACIONAL EN VILLAVICENCIO, META

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    Luz Díaz P

    2008-04-01

    Full Text Available Objetivo. Determinar la seroprevalencia a la infección por leptospira en una población humana y los factores de riesgo ocupacional asociados en Villavicencio, Meta. Materiales y métodos. Se aplicó un modelo epidemiológico transversal con selección por conveniencia de grupos e individuos dentro de grupos. Se obtuvieron muestras de sangre por punción cubital de 273 personas correspondientes a 8 grupos de riesgo. Se obtuvo información de factores de riesgo mediante entrevista. Se determinaron anticuerpos IgM mediante ELISA indirecta. Se utilizó una prueba de c2 mediante el programa SPSS 11.0 para Windows. Resultados. La seroprevalencia general fue 19%. Por grupos fue para trabajadores de matadero 7%, veterinarios y auxiliares de clínica de pequeños animales 17%, estudiantes de último año de MVZ 17%, ordeñadores 21%, trabajadores de arrozales 23%, trabajadores de granjas porcícolas 35%, trabajadores de piscícolas 48%. Se encontraron 3 factores asociados, el estrato rural p = 0.0005 ICCR 1.50 a 3.83, tenencia de mascota canina p = 0.046 ICCR 1.03 a 3.26 y contacto con roedores en el trabajo p = 0.000037 ICCR = 1.73 a 4.75. Conclusiones. Se encontró una alta seroprevalencia general de infectados por Leptospira, siendo los grupos de más alta prevalencia los trabajadores piscícolas y de granjas porcícolas. Se reconoce una vez más el carácter ocupacional de la infección posiblemente por falta de medidas de higiene y protección laboral.

  20. Bajo índice de sospecha para deficiencia de anticuerpos en niños sometidos a procedimientos quirúrgicos de Otorrinolaringología

    OpenAIRE

    AB Ramírez-López; CG Zúñiga-Lagunes; A Martínez-Viveros; EA Medina-Torres; C Murata; SE Espinosa-Padilla; SO Lugo-Reyes

    2016-01-01

    INTRODUCCIÓN: las inmunodeficiencias primarias están subdiagnosticadas en todo el mundo, aun en centros de tercer nivel de atención. Los defectos de anticuerpos constituyen el grupo más prevalente y suelen manifestarse clínicamente después de los 6 meses de edad como infecciones respiratorias recurrentes causadas por bacterias encapsuladas. Algunas cirugías de oído-nariz y garganta se indican en pacientes con infecciones respiratorias recurrentes o complicadas que no han respondido adecuadame...

  1. Encefalitis límbica autoinmune por anticuerpos anticanales de potasio dependientes de voltaje: a propósito de un caso

    OpenAIRE

    2016-01-01

    La encefalitis límbica (EL) se ha descrito como una entidad de origen viral o autoinmunitario secundaria a la presencia de autoanticuerpos antineuronales. Una de estas formas de presentación se asocia a la presencia de anticuerpo frente a canales de potasio voltaje dependientes (CKVD). Clínicamente se manifiesta como pérdida de memoria subaguda, cambios de comportamiento, desorientación progresiva, crisis epilépticas, trastornos psiquiátricos, insomnio, depresión, alucinaciones e hiponatremia...

  2. Inmunodetección de anticuerpos anti-insulina libres en suero y unidos a la molécula de insulina en pacientes insulino-dependientes

    OpenAIRE

    Domínguez Romero, Leidy Yohana

    2014-01-01

    El uso de la terapia insulínica como tratamiento para la Diabetes, basado en la administración de Insulina Exógena (IE) de origen animal –con alta homología a la insulina humana, a nivel de la secuencia proteica, se asoció en sus inicios con la prevalencia de Anticuerpos Anti-Insulina (AAI) [1, 2], relacionados a su vez con alteraciones en la seguridad y eficacia de estas formulaciones [3-6]. Con la aparición de insulinas de origen recombinante –bajo la premisa de la identidad con la secuenci...

  3. Prueba de Elisa indirecta para la detección de anticuerpos IgM para el diagnóstico de Leptospirosis humana

    OpenAIRE

    Manuel Céspedes Z; Martha Glenny A; Vidal Felices A; Lourdes Balda J; Víctor Suárez M

    2002-01-01

    Para el diagnóstico temprano de enfermedades con cuadro clínico inespecífico como la leptospirosis, es necesario la confirmación laboratorial mediante pruebas específicas, con la finalidad de que el diagnóstico sea más acertado y rápido. Objetivo: se realizó un estudio comparativo entre la prueba de microaglutinacion (MAT) y la prueba de ELISA indirecta estandarizada con un "pool" de antígenos de Leptospira interrogans, para la detección de anticuerpos IgM, en muestras de suero de fase aguda ...

  4. [IgG4- and MPO-ANCA-associated hypertrophic pachymeningitis].

    Science.gov (United States)

    Aragonès, Josep M; Arias-Rivero, Montserrat; García-Barrionuevo, Joan M; Lucchetti, Gianni

    2015-11-16

    Introduccion. La paquimeningitis hipertrofica idiopatica es una enfermedad fibroinflamatoria de la duramadre. Su diagnostico requiere la exclusion de enfermedades infecciosas, tumorales y otras enfermedades inflamatorias. En los ultimos años se han descrito nuevas entidades que pueden presentarse con paquimeningitis hipertrofica: la enfermedad relacionada con IgG4 y la paquimeningitis MPO-ANCA+ como forma de vasculitis limitada al sistema nervioso central. Caso clinico. Varon de 64 años con cefalea y cervicalgia de predominio nocturno y clinica de compresion medular. Tras el diagnostico de paquimeningitis hipertrofica craneocervical facilitado por el estudio de resonancia magnetica, se realizo un estudio etiologico. Se descartaron enfermedades infecciosas y tumorales. La clinica no mostraba afectacion sistemica y en la analitica presentaba IgG4 elevada y MPO-ANCA+. Tras tratamiento con corticoides presento una rapida mejoria de la clinica. Conclusiones. La enfermedad relacionada con IgG4 y la vasculitis asociada a MPO-ANCA limitada al sistema nervioso central pueden representar un alto porcentaje de las paquimeningitis hipertroficas que se consideraban idiopaticas, y su diagnostico requiere biopsia y estudio histologico.

  5. Heterogeneity of IgG glycosylation in adult periodontal disease.

    Science.gov (United States)

    Novak, J; Tomana, M; Shah, G R; Brown, R; Mestecky, J

    2005-10-01

    Periodontal disease is a chronic inflammatory disease of bacterial etiology. In many other chronic inflammatory diseases, IgG glycans are galactose-deficient and thus capable of complement activation through the lectin pathway. In this study, we examined whether IgG in serum and gingival crevicular fluid, and IgG locally produced by plasma cells in gingiva of periodontal disease patients, display altered glycosylation. We developed a lectin-ELISA to measure levels of galactose-deficient IgG in the fluids and immunofluorescence staining to detect galactose-deficient IgG-producing cells in gingiva. Our results indicated higher levels of galactose-deficient IgG in sera and gingival crevicular fluid from periodontal disease patients, compared with levels in healthy controls. Furthermore, gingivae from periodontal disease patients exhibited infiltration of IgG-producing plasma cells; many of them contained galactose-deficient IgG in the cytoplasm. Analysis of our data suggests that IgG secreted by B-cells was aberrantly glycosylated, which resulted in the production of pro-inflammatory galactose-deficient IgG.

  6. Clinical study on IgG4-related autoimmune pancreatitis

    Institute of Scientific and Technical Information of China (English)

    吴庆军

    2013-01-01

    Objective To investigate the clinical features of IgG4-related autoimmune pancreatitis(IgG4-related AIP). Methods A prospective cohort study on IgG4 related disease(IgG4-RD) was carried out in Peking Union Medical College Hospital during December 2010 to June

  7. IgG4-Related Disease: A Multispecialty Condition

    Directory of Open Access Journals (Sweden)

    Iuri Usêda Santana

    2014-01-01

    Full Text Available IgG4-related disease (IgG4-RD is a recently recognized group of conditions, characterized by tumor-like swelling of involved organs, lymphoplasmacytic infiltrate rich in IgG4-positive plasma cells, variable degrees of fibrosis, and elevated serum IgG4 concentrations. Currently IgG4-RD is recognized as a systemic condition that can affect several organs and tissues. Herein we report the case of a 34-year-old male patient who was admitted to our hospital with diffuse abdominal pain, weight loss, and painful stiffness in his neck. He had a history of tumoral mass of the left maxillary region, right palpebral ptosis with protrusion of the eyeball, and chronic dry cough for about 6 years. Laboratory tests revealed polyclonal hypergammaglobulinemia and increased serum IgG4 levels. Immunohistochemical staining of the maxillary biopsy was compatible with IgG4-RD. He had an excellent response to corticosteroid therapy. This case highlights that IgG4-RD should be included in the differential diagnosis with multisystem diseases.

  8. IgG glycosylation changes and MBL2 polymorphisms

    DEFF Research Database (Denmark)

    Troelsen, Lone N; Jacobsen, Søren; Abrahams, Jodie L;

    2012-01-01

    To examine whether IgG glycosylation changes and MBL2 genotypes are associated with systemic inflammation and joint destruction in rheumatoid arthritis (RA).......To examine whether IgG glycosylation changes and MBL2 genotypes are associated with systemic inflammation and joint destruction in rheumatoid arthritis (RA)....

  9. Optimización del ensayo vibriocida colorimétrico para la determinación de anticuerpos séricos contra V. cholerae del serogrupo O139

    OpenAIRE

    Joivier Vichi-Lozada; Edith Suzarte-Portal; Talena Ledón-Pérez; Rafael Fando-Calzada

    2011-01-01

    El título de anticuerpos vibriocidas es reconocido actualmente como el mejor marcador de inmunidad protectora ante la infección con Vibrio cholerae. Su evaluación permite estudiar la efectividad de vacunas durante ensayos preclínicos y clínicos, a través de la determinación de la funcionalidad de anticuerpos séricos, capaces de lisar células en presencia de complemento exógeno. Se han desarrollado distintos ensayos bactericidas con puntos finales y métodos de determinación del título vibrioci...

  10. IgG4-Seronegative Autoimmune Pancreatitis and Sclerosing Cholangitis

    Directory of Open Access Journals (Sweden)

    Allon Kahn

    2015-01-01

    Full Text Available IgG4-related disease is a relatively novel clinical entity whose gastrointestinal manifestations include type 1 autoimmune pancreatitis (AIP and IgG4-associated sclerosing cholangitis. The presence of elevated serum IgG4 is suggestive but not essential for the diagnosis of type 1 AIP and is a pervasive feature of the proposed diagnostic criteria. The differential diagnosis of type 1 AIP includes malignant conditions, emphasizing the importance of a deliberate, comprehensive evaluation. Management of patients with a suggestive clinical presentation, but without serum IgG4 elevation, is difficult. Here we present three cases of IgG4-seronegative AIP and sclerosing cholangitis that responded to empiric steroid therapy and discuss approach considerations. These cases demonstrate the value of meticulous application of existing diagnostic algorithms to achieve a clinical diagnosis and avoid surgical intervention.

  11. TREATMENT OF IgG4-RELATED DISEASE

    Directory of Open Access Journals (Sweden)

    E. V. Sokol

    2016-01-01

    Full Text Available IgG4-related disease (IgG4-RD is a fibroinflammatory condition characterized by the occurrence of tumor-like foci in different organs with a unique histological pattern (moirо-like fibrosis, obvious lymphoplasmacytic infiltration with large numbers of IgG4+ plasma cells, and obliterating phlebitis and elevated serum IgG4 levels in the majority of patients. Its first-line therapy is glucocorticoids at a starting dose of 0.6 mg/kg/day (equivalent to prednisolone; however, this treatment entails a great number of adverse events and high recurrence rates. The paper provides a review of today's literature on the treatment of IgG4-RD; particular emphasis is laid on the description of therapy with glucocorticoids and rituximab.

  12. IgG4-Related Disease Presenting as Isolated Scleritis

    Directory of Open Access Journals (Sweden)

    Eran Berkowitz

    2017-01-01

    Full Text Available A rare case of IgG4-related disease (IgG4-RD manifesting as nodular scleritis is presented in a 20-year-old female. Patient complained of left eye pain and redness for one week. Ocular examination together with ancillary testing led to the diagnosis of nodular scleritis. Since the patient did not show apparent improvement after one week of systemic steroidal treatment, she underwent a biopsy of the affected area revealing histopathological characteristics of IgG4-RD. Long-term treatment with corticosteroids and a steroid-sparing agent (methotrexate led to significant improvement in signs and symptoms. This case highlights the significance of IgG4-RD in the differential diagnosis of scleritis and raises the question as to whether various organs affected by IgG4-RD may have different underlying pathophysiological mechanisms in which pathogenic T cells play a role.

  13. IgG4-Related Disease Presenting as Isolated Scleritis

    Science.gov (United States)

    Arnon, Ella; Yaakobi, Alona; Cohen, Yuval; Tiosano, Beatrice

    2017-01-01

    A rare case of IgG4-related disease (IgG4-RD) manifesting as nodular scleritis is presented in a 20-year-old female. Patient complained of left eye pain and redness for one week. Ocular examination together with ancillary testing led to the diagnosis of nodular scleritis. Since the patient did not show apparent improvement after one week of systemic steroidal treatment, she underwent a biopsy of the affected area revealing histopathological characteristics of IgG4-RD. Long-term treatment with corticosteroids and a steroid-sparing agent (methotrexate) led to significant improvement in signs and symptoms. This case highlights the significance of IgG4-RD in the differential diagnosis of scleritis and raises the question as to whether various organs affected by IgG4-RD may have different underlying pathophysiological mechanisms in which pathogenic T cells play a role. PMID:28149653

  14. The blocking activity of birch pollen-specific immunotherapy-induced IgG4 is not qualitatively superior to that of other IgG subclasses

    DEFF Research Database (Denmark)

    Ejrnaes, Anne M; Bødtger, Uffe; Larsen, Jørgen N;

    2004-01-01

    blocking activity was found in the purified IgG4 fraction. There was no significant difference in the binding avidities (1/K(d)) measured in the two IgG fractions. Thus, it appears that SIT-induced specific IgG4 contributes to the IgG blocking of allergen binding to IgE in a simple quantitative manner...

  15. Detección de anticuerpos contra Borrelia burgdorferi e identificación de garrapatas ixodidas en Piura Y Amazonas, Perú

    Directory of Open Access Journals (Sweden)

    Martha Glenny A

    2004-01-01

    Full Text Available Objetivos: Detectar anticuerpos IgG/IgM contra Borrelia burgdorferi en población general, procedentes de los departamentos de Piura y Amazonas e identificar especies de garrapatas probablemente incriminadas en la transmisión de la enfermedad de Lyme. Material y Métodos: Entre agosto del año 2001 y junio de 2002, se colectaron muestras de sangre de 232 pobladores procedentes de ocho localidades del Departamento de Piura y 12 del Departamento de Amazonas, para evaluar mediante ELISA Captia™ Lyme IgG/IgM (Trinity biotech la presencia de anticuerpos contra Borrelia burgdorferi. Además, se colectaron garrapatas en animales domésticos por búsqueda directa. Resultados: Se detectó seropositividad en 9,9 % de los sueros evaluados. Asimismo, de 433 garrapatas colectadas se identificaron los géneros: Ixodes (5,5%, Amblyomma (18,0%, Rhipicephalus (23,5%, Anocentor (31,1% y Boophilus (21,7%. Conclusiones: Existen personas seropositivas por Borrelia en Piura y Amazonas, coincidiendo con los hallazgos realizados en Sapillica en el año 1992, además se detectó la presencia de garrapatas del género Ixodes en Piura.

  16. [IgG4-related kidney disease. Diagnosis and treatment].

    Science.gov (United States)

    Kawano, Mitsuhiro; Mizushima, Ichiro; Yamada, Kazunori; Taniguchi, Yoshinori; Saeki, Takako

    2015-01-01

    IgG4-related disease (IgG4-RD) is a systemic inflammatory disorder that can affect most organs/tissues like sarcoidosis. The kidney is one of the most frequently affected organs. While tubulointerstitial nephritis (TIN) with characteristic imaging findings is the representative lesion of IgG4-related kidney disease (IgG4-RKD), a variety of glomerular lesions, particularly membranous nephropathy, sometimes overlap on TIN. Clinically, either decreased renal function and/or characteristic imaging findings such as multiple low-density lesions on contrast-enhanced computed tomography are typical presenting features. Histologically, plasma cell (PC)-rich TIN accompanied by characteristic fibrosis called storiform fibrosis with dense IgG4-positive PC infiltration is a typical finding. Although a swift response to corticosteroid is a very important feature of IgG4-RKD, in cases with moderately to severely decreased renal function before therapy, only partial recovery of renal function is obtained. This review provides a comprehensive overview of IgG4-RKD from the clinical, laboratory, imaging, and histological aspects and also addresses some of the therapeutic issues concerning it.

  17. Production of anti-horse antibodies induced by IgG, F(ab')2 and Fab applied repeatedly to rabbits. Effect on antivenom pharmacokinetics.

    Science.gov (United States)

    Vázquez, Hilda; Olvera, Felipe; Alagón, Alejandro; Sevcik, Carlos

    2013-12-15

    We separated whole IgG, Fab and F(ab')2 fragments from horse plasma. We previously studied the pharmacokinetics of these immunoglobulins and fragments in rabbits and shown that Fab and F(ab')2 pharmacokinetics were well described by a three-exponential kinetics, while IgG and IgG(T) pharmacokinetics, however, deviated from the three-exponential kinetics 120 h after injecting a bolus of the immunotherapeutics; this departure was shown to be due to a surge of anti-horse antibodies occurring after 120 h, peaking at ≈260 h and decaying slowly afterward (Vázquez et al., 2010). We now describe antivenom pharmacokinetics and anti-horse IgG production in rabbits receiving three boluses (300 μg/kg, I.V.) of Fab, F(ab')2 or IgG separated by 21 days.

  18. Bioavailability of IgG Administered by the Subcutaneous Route

    OpenAIRE

    Berger, Melvin; Jolles, Stephen; Orange, Jordan S.; Sleasman, John W

    2013-01-01

    Purpose US licensing studies of subcutaneous IgG (SCIG) calculate dose adjustments necessary to achieve area under the curve (AUC) of serum IgG vs. time on SCIG that is non-inferior to that on intravenous IgG (IVIG), within the FDA-set limit of ±20 %. The results are interpreted as showing that different SCIGs differ in bioavailability. We used three approaches to determine if the bioavailabilities were actually different. Methods Dose adjustments and AUCs from published licensing studies wer...

  19. In vitro functional characterization of feline IgGs.

    Science.gov (United States)

    Strietzel, Catherine J; Bergeron, Lisa M; Oliphant, Theodore; Mutchler, Veronica T; Choromanski, Leszek J; Bainbridge, Graeme

    2014-04-15

    Very little is known about the functional properties of feline IgGs. Here we report the in vitro characterization of cloned feline IgGs. Rapid amplification of cDNA ends (RACE) and full-length PCR of cat splenic cDNA were used to identify feline sequences encoding IgG heavy chain constant regions (IGHC). Two of the sequences are possibly allelic and have been previously reported in the literature as the only feline IgG, IgG1. Although we confirmed these alleles to be highly abundant (∼98%), analysis of numerous amplification products revealed an additional sequence (∼2%). We cloned and characterized chimeric monoclonal antibodies with each of these heavy chains. Using RACE we revealed the sequences for feline Fc gamma receptor I (FcγRI) and feline Fc neonatal receptor (FcRn). We constructed these recombinant receptors as well as fFcγRIII and determined their binding affinities to the chimeras. All of the chimeras bound to Protein A but not to Protein G, and bound tightly to fFcRn (KD=2-5 nM). Both IgG1 alleles have a high affinity for fFcγRI (KD=10-20 nM), they bind to the low-affinity fFcγRIII receptor (2-4 μM), and also bind to human complement C1q. Thus, feline IgG1a and 1b are expected to induce strong effector function in vivo. The additional IgG detected does not bind to recombinant fFcγRI or fFcγRIII and has negligible binding to hC1q. Consequently, although this putative subclass is projected to have a similar serum half-life as the IgG1 alleles based on comparable in vitro affinity to FcRn, it may not elicit the effector responses mediated by fFcγRI or fFcγRIII. Further testing with native receptors and functional cell-based assays would confirm effector function capabilities of feline IgG subclasses; however this is the first report characterizing affinities of feline IgGs to their Fc receptors and helps pave the way for construction of feline-specific IgGs for therapeutic use.

  20. Estudio del anticuerpo DOG1 en el diagnóstico de tumores del estroma gastrointestinal - GIST The role of the DOG1 antibody in the diagnosis of gastrointestinal stromal tumours - GIST

    Directory of Open Access Journals (Sweden)

    M.R. Mercado

    2011-08-01

    Full Text Available Los tumores del estroma gastrointestinal (GIST poseen mutaciones en los genes del receptor de la tirosín quinasa (RTKs KIT y PDGFRA. La posibilidad de bloquear esta actividad ha significado una nueva esperanza terapéutica. El diagnóstico de GIST recae en la expresión inmunohistoquímica del c-KIT, pero un 4-15% son c-KIT negativos (aún en presencia de mutación, y sin embargo estos pacientes podrían beneficiarse del tratamiento con inhibidores tirosín quinasa (TKIs. El DOG1 es un nuevo anticuerpo cuya sensibilidad y especificidad parece ser superior o igual a la del c-KIT. El objetivo de este trabajo es evaluar la sensibilidad (Se y especificidad (Sp de DOG1 en GIST de tipo usual (c-KIT positivos, de tipo inusual (c-KIT negativos y frente a otros tumores fusocelulares mesenquimales, y comparar la validez diagnóstica del DOG1 frente al c-KIT. Estudiamos 40 GIST, 39 c-KIT positivos y un c-KIT negativo. Se realizó un panel inmunohistoquímico con los anticuerpos: c-KIT, CD34, actina músculo liso, DOG1 y S100, en los GIST como en siete tumores fusocelulares. La Se y Sp de GIST para DOG1 fue del 100 y 97,5% para c-KIT. La inmunoreactividad para DOG1 en todos los tumores fusocelulares fue negativa. La validez diagnóstica de DOG1 y C-KIT fue similar a la hora de detectar GIST y no GIST. DOG1 es un marcador específico y sensible para el diagnóstico y diagnóstico diferencial de GISTs (es capaz de detectar algunos GIST sin mutación en RTK. El DOG1 debería de formar parte del panel inmunohistoquímico para el diagnóstico de GIST.Gatrointestinal stromal tumours (GIST harbour oncogenic mutations in tyrosin kynases receptors (RTKs including KIT and PDGFRA. The inhibition of this activity has been regarded as the primary target for the treatment of these patients. Diagnosis of GIST relies on c-KIT inmunoreactivity; however there is a 4-15% of GISTs that are C-KIT negative which may lead to underdiagnosis of GISTs and possible withholding of

  1. Prevalencia de anticuerpos anti-Leptospira spp. en personas con exposición laboral en el departamento del Tolima / Prevalence of anti-Leptospira spp. antibodies among people with occupational exposure in Tolima Department

    Directory of Open Access Journals (Sweden)

    Blanca L. Guzmán-Barragán

    2016-05-01

    Full Text Available Resumen Objetivo: estimar la prevalencia de anticuerpos IgM contra Leptospira spp., mediante el Ensayo de Inmunoabsorción Ligado a Enzimas (elisa, en la población de riesgo laboral de 8 municipios del Tolima. Metodología: se obtuvieron muestras de sangre de 261 empleados, las cuales fueron analizadas mediante la técnica de elisa para la detección de anticuerpos IgM anti-Leptospira spp., seguido de mat y serotipificación. Resultado: se estimó una seroprevalencia del 25,29%, con una seroreactividad mayor en trabajadores de plantas de beneficio animal (34,2%, recolección de residuos sólidos (27,1% y trabajadores de acueducto y alcantarillado (14,8%. La actividad en plantas de beneficio animal se identificó como factor de riesgo de Leptospira spp. (OR=1,86. Los serovares identificados fueron L. Bratislava (16, Ballum (5, Tarassovi (3, Hebdomadis (2, Sejroe (2 y Icterhemorragiae (1. El municipio de Libano presento el mayor porcentaje de positividad (36,96%, seguido de Espinal y Guamo con 28,57% cada uno. Discusión: la evaluación del sistema de vigilancia indicó deficiencia en recursos y debilidades de los profesionales de la salud al desconocer los procedimientos, investigación, diagnóstico y notificación de la enfermedad. Conclusiones: la leptospirosis está presente en poblaciones de riesgo laboral en el Tolima y se hace necesario abordar esta problemática en la población de otros municipios y los animales transmisores de la enfermedad. / Abstract Objective: to estimate the prevalence of IgM antibodies against Leptospira spp. Using the enzyme-linked immunosorbent assay (elisa in a population at occupational risk from 8 municipalities of the Tolima department, Colombia. Methodology: blood samples were collected from 261 employees and analyzed with the elisa technique to detect IgM and anti-Leptospira spp. antibodies. This was followed by mat and serotyping. Results: a seroprevalence of 25.29% was estimated, with higher

  2. Indel Group in Genomes (IGG) Molecular Genetic Markers1[OPEN

    Science.gov (United States)

    Burkart-Waco, Diana; Kuppu, Sundaram; Britt, Anne; Chetelat, Roger

    2016-01-01

    Genetic markers are essential when developing or working with genetically variable populations. Indel Group in Genomes (IGG) markers are primer pairs that amplify single-locus sequences that differ in size for two or more alleles. They are attractive for their ease of use for rapid genotyping and their codominant nature. Here, we describe a heuristic algorithm that uses a k-mer-based approach to search two or more genome sequences to locate polymorphic regions suitable for designing candidate IGG marker primers. As input to the IGG pipeline software, the user provides genome sequences and the desired amplicon sizes and size differences. Primer sequences flanking polymorphic insertions/deletions are produced as output. IGG marker files for three sets of genomes, Solanum lycopersicum/Solanum pennellii, Arabidopsis (Arabidopsis thaliana) Columbia-0/Landsberg erecta-0 accessions, and S. lycopersicum/S. pennellii/Solanum tuberosum (three-way polymorphic) are included. PMID:27436831

  3. IgG4-RELATED DISEASE. CLINICAL NOTES

    Directory of Open Access Journals (Sweden)

    Vladimir Ivanovich Vasilyev

    2013-01-01

    Full Text Available IgG4-related diseases are a new nosological entity that encompasses a few previously known diseases. IgG4-related systemic disease is diagnosed if two or more affected organs are detected. This group of diseases has two similar signs: serological (elevated serum IgG4 subclass concentrations and histological (organ and tissue infiltration from plasmo-cytes secreting IgG4, and eosinophils, and the development of fibrosclerosis and phlebitis obliterans. The paper describes two cases. In one case, a multisystemic disease was observed virtually at its onset whereas in the other this lesion was diagnosed several years after the natural course of the disease.

  4. Increased IgG4-Positive Plasma Cells in Granulomatosis with Polyangiitis: A Diagnostic Pitfall of IgG4-Related Disease

    Directory of Open Access Journals (Sweden)

    Sing Yun Chang

    2012-01-01

    Full Text Available Granulomatosis with polyangiitis (Wegener’s (GPA may mimic IgG4-related disease (IgG4-RD on histologic examination of some biopsies, especially those from head and neck sites. IgG4 immunostain is often performed in this context for differential diagnosis with IgG4-RD. However, the prevalence of IgG4+ cells in GPA has not been explored. We examined the IgG4+ cells in 26 cases confirmed as GPA by a thorough clinical and pathologic assessment. Twenty-six biopsies consisted of 14 sinonasal/oral cavity/nasopharynx, 7 orbit/periorbital, 3 lung/pleura, 1 iliac fossa/kidney, and 1 dura specimens. Eight of 26 (31% biopsies revealed increased IgG4+ cells (>30/HPF and >40% in IgG4+/IgG+ ratio. The IgG4+ cells and IgG4+/IgG+ ratio ranged 37–137/hpf and 44–83%, respectively. Eight biopsies with increased IgG4+ cells were from sinonasal (n=4 or orbital/periorbital (n=4 sites. In conclusion, increased IgG4+ cells are not uncommonly seen in sinonasal or orbital/periorbital biopsies of GPA, which could pose as a diagnostic pitfall.

  5. DETERMINACIÓN DEL CATABOLISMO DE LOS ANTICUERPOS MATERNOS Y SU INTERACCIÓN CON DIFERENTES PLANES VACUNALES PARA LA ENFERMEDAD DE GUMBORO EN POLLOS DE ENGORDE

    Directory of Open Access Journals (Sweden)

    Robin O. J.

    2006-11-01

    Full Text Available Con el in de evaluar el catabolismo de los anticuerpos maternos y su interferencia con tres planes vacunales diferentes contra la enfermedad de Gumboro se realizó un estudio utilizando pollos de la estirpe Ross 308, divididos en cuatro grupos: grupo 1: control (sin vacuna; grupo 2: vacunado los días 1, 7 y 15; grupo 3: vacunados los días 1 y 12; y grupo 4: vacunado el día 12. En el primer experimento el biológico se suministró en el agua de bebida, y en el segundo se hizo en el pico. Se sacriicaron 15 aves de cada grupo a los 1, 12, 21 y 42 días de edad y se evaluó peso corporal, tamaño y peso de la bolsa de Fabricio, relación peso bolsa/peso corporal (PB/PC, grado de depleción linfoide, presencia de cepas estándar y/o variantes del virus y los títulos de anticuerpos para la enfermedad de Gumboro. El catabolismo de los anticuerpos maternos ocurrió entre los 21 y 28 días de edad. En los grupos vacunados no se evidenció una respuesta inmune activa frente a ningún plan vacunal. La relación PB/PC no indicó atroia de la bolsa en el experimento 1, aunque las lesiones histopatológicas en el último muestreo fueron grado 3; en el segundo experimento solamente el grupo 3 presentó una disminución en la relación PB/PC; las lesiones histopatológicas en el tercer y cuarto muestreos, en todos los grupos, fueron clasiicadas como grado 3 y 4. En los dos experimentos se detectó la presencia de cepas tanto clásicas como variantes y una baja respuesta humoral. Ninguno de los tres planes vacunales conirió adecuada protección a las aves.

  6. DETERMINACIÓN DEL CATABOLISMO DE LOS ANTICUERPOS MATERNOS Y SU INTERACCIÓN CON DIFERENTES PLANES VACUNALES PARA LA ENFERMEDAD DE GUMBORO EN POLLOS DE ENGORDE

    Directory of Open Access Journals (Sweden)

    R. Castañeda

    2006-01-01

    Full Text Available Con el in de evaluar el catabolismo de los anticuerpos maternos y su interferencia con tres planes vacunales diferentes contra la enfermedad de Gumboro se realizó un estudio utilizando pollos de la estirpe Ross 308, divididos en cuatro grupos: grupo 1: control (sin vacuna; grupo 2: vacunado los días 1, 7 y 15; grupo 3: vacunados los días 1 y 12; y grupo 4: vacunado el día 12. En el primer experimento el biológico se suministró en el agua de bebida, y en el segundo se hizo en el pico. Se sacriicaron 15 aves de cada grupo a los 1, 12, 21 y 42 días de edad y se evaluó peso corporal, tamaño y peso de la bolsa de Fabricio, relación peso bolsa/peso corporal (PB/PC, grado de depleción linfoide, presencia de cepas estándar y/o variantes del virus y los títulos de anticuerpos para la enfermedad de Gumboro. El catabolismo de los anticuerpos maternos ocurrió entre los 21 y 28 días de edad. En los grupos vacunados no se evidenció una respuesta inmune activa frente a ningún plan vacunal. La relación PB/PC no indicó atroia de la bolsa en el experimento 1, aunque las lesiones histopatológicas en el último muestreo fueron grado 3; en el segundo experimento solamente el grupo 3 presentó una disminución en la relación PB/PC; las lesiones histopatológicas en el tercer y cuarto muestreos, en todos los grupos, fueron clasiicadas como grado 3 y 4. En los dos experimentos se detectó la presencia de cepas tanto clásicas como variantes y una baja respuesta humoral. Ninguno de los tres planes vacunales conirió adecuada protección a las aves.

  7. OBTENCIÓN DE ANTICUERPOS ESPECÍFICOS PARA LA DETECCIÓN DEL Tamarillo leaf malformation virus (TALMV EN TOMATE DE ÁRBOL

    Directory of Open Access Journals (Sweden)

    YULIANA GALLO GARCÍA

    2011-01-01

    Full Text Available En Colombia el rendimiento del cultivo de tomate de árbol se ha visto seriamente afectado por la expansión de una enfermedad conocida como virosis de tomate de árbol. Esta patología se registró inicialmente en 1991 en el norte de Antioquia y su expansión ha alcanzado todas las regiones cultivadoras de este frutal en el país. Trabajos recientes han detectado la presencia de por lo menos dos especies del género Potyvirus (Potyviridae asociadas a esta enfermedad en los cultivos de tomate de árbol de Antioquia: Potato virus Y (PVY y Tamarillo leaf malformation virus (TaLMV, especie propuesta. Con el fin de reducir la diseminación de estos patógenos virales en el país, es necesario contar con herramientas de diagnóstico que permitan la certificación del material de siembra y la detección tem- prana en plantas asintomáticas. En este trabajo se obtuvieron anticuerpos policlonales específicos para la detección del virus TaLMV utilizando una región antigénica de 15 re- siduos de la cápside viral. La sensibilidad y especificidad de los anticuerpos anti-TaLMV fue evaluada mediante pruebas de ELISA y dot-blot utilizando proteína recombinante y péptidos sintéticos como controles. La utilidad de estos anticuerpos fue validada a partir de una prueba piloto de detección de TaLMV en muestras de plantas de tomate de árbol con y sin síntomas de virosis obtenidas en el oriente antioqueño. Los resultados serolgicos fueron comparados con los niveles de detección que ofrece la técnica de RT-PCR con cebadores específicos para la cápside viral de TaLMV.

  8. Localized IgG4-related Cholecystitis Mimicking Gallbladder Cancer.

    Science.gov (United States)

    Inoue, Tadahisa; Okumura, Fumihiro; Mizushima, Takashi; Nishie, Hirotada; Iwasaki, Hiroyasu; Anbe, Kaiki; Ozeki, Takanori; Kachi, Kenta; Fukusada, Shigeki; Suzuki, Yuta; Watanabe, Kazuko; Sano, Hitoshi

    2015-01-01

    We encountered a case of localized IgG4-cholecystitis mimicking gallbladder cancer with focal/segmental type1 autoimmune pancreatitis (AIP). In this case, we were unable to exclude a diagnosis of gallbladder cancer and thus performed radical cholecystectomy. Type1 AIP is often associated with gallbladder lesions, accompanied by generally diffuse, circumferential thickening of the gallbladder wall. Although localized IgG4-related cholecystitis is extremely rare, differentiating this condition from gallbladder cancer is often very difficult.

  9. IgG4-Related Disease in a Urachal Tumor

    Directory of Open Access Journals (Sweden)

    Travis W. Dum

    2014-01-01

    Full Text Available IgG4-related disease is a newly recognized fibroinflammatory disorder that has the ability to affect nearly every organ system. It is characterized by tumefactive lesions and fibrosis and closely mimics neoplasms. Only one case of IgG4-related bladder mass has been reported in the literature, but there are no reports of IgG4-related disease in a urachal mass. Herein, we report a 26-year-old male who initially presented with symptoms of recurrent UTI. Work-up revealed a 6 cm urachal tumor, a 1.4 cm pulmonary lesion, and mediastinal lymphadenopathy; all metabolically active on PET scan and suspicious for urachal adenocarcinoma. Lung lesion fine needle aspiration and TURBT pathology revealed inflammation but no evidence of malignancy. The patient underwent a partial cystectomy and umbilectomy with pathology demonstrating dense plasmacytic cells, a high rate of immunohistochemistry staining positive for IgG4 plasma cells, a storiform pattern of fibrosis, and an obliterative phlebitis. Furthermore, the patient had an elevated serum IgG4 level of 227 mg/dL (range 2.4–121 mg/dL. IgG4-related disease is a newly recognized fibroinflammatory disorder that can mimic neoplastic processes and a high index of suspicion and accurate tissue pathology is necessary for an accurate diagnosis.

  10. Aggregated IgG inhibits the differentiation of human fibrocytes.

    Science.gov (United States)

    Pilling, Darrell; Tucker, Nancy M; Gomer, Richard H

    2006-06-01

    Fibrocytes are fibroblast-like cells, which appear to participate in wound healing and are present in pathological lesions associated with asthma, pulmonary fibrosis, and scleroderma. Fibrocytes differentiate from CD14+ peripheral blood monocytes, and the presence of serum delays this process dramatically. We previously purified the factor in serum, which inhibits fibrocyte differentiation, and identified it as serum amyloid P (SAP). As SAP binds to Fc receptors for immunoglobulin G (IgG; Fc gammaRs), Fc gammaR activation may be an inhibitory signal for fibrocyte differentiation. Fc gammaR are activated by aggregated IgG, and we find aggregated but not monomeric, human IgG inhibits human fibrocyte differentiation. Monoclonal antibodies that bind to Fc gammaRI (CD64) or Fc gammaRII (CD32) also inhibit fibrocyte differentiation. Aggregated IgG lacking Fc domains or aggregated IgA, IgE, or IgM do not inhibit fibrocyte differentiation. Incubation of monocytes with SAP or aggregated IgG inhibited fibrocyte differentiation. Using inhibitors of protein kinase enzymes, we show that Syk- and Src-related tyrosine kinases participate in the inhibition of fibrocyte differentiation. These observations suggest that fibrocyte differentiation can occur in situations where SAP and aggregated IgG levels are low, such as the resolution phase of inflammation.

  11. Asociación del anticuerpo anti-C1q con las manifestaciones clínicas, hematológicas e inmunológicas en el Lupus Eritematoso Sistémico : Estudio observacional retrospectivo de 135 casos.

    OpenAIRE

    Córica, María Emilia

    2012-01-01

    : Las concentraciones de anticuerpo anti-C1q están elevadas en los pacientes afectados de LES. Según algunos estudios la presencia de este anticuerpo está asociada a la nefropatía lúpica, sin embargo en otros estudios esta relación no se comprobó. En nuestro trabajo relacionamos la positividad del anticuerpo anti-C1q con las manifestaciones clínicas, hematológicas e inmunológicas de la enfermedad. A diferencia de estudios previos sólo pudimos establecer una relación estadísticamente significa...

  12. Soroprevalência de anticorpos contra vírus herpes simples 1-2 no Brasil Seroprevalencia de anticuerpos contra virus herpes simples 1-2 en Brasil Seroprevalence of herpes simplex 1-2 antibodies in Brazil

    Directory of Open Access Journals (Sweden)

    Sue Ann Costa Clemens

    2010-08-01

    de sangre para detección de anticuerpos para HSV-1 y HSV-2 con prueba tipo-específica ELISA gG1-gG2. Fueron descritas frecuencias y proporciones y comparadas entre grupos utilizando la prueba de Fisher bilateral exacta. Fue realizado análisis de regresión logística para evaluar influencia de las variables edad, sexo, geografía, grupo económico, histórico de DST, seropositividad para anti-HSV-1 o anti-HSV-2 e interacciones de cualquiera de esos factores sobre la seroprevalencia de HSV-1 y/o HSV-2. RESULTADOS: La tasa de seroprevalencia de anticuerpos para HSV-1 ajustada por edad fue de 67,2%, sin diferencia con relación al sexo, siendo mayor en la Región Norte. Las seroprevalencias aumentaron con la edad, y para HSV-2, hube un aumento significativo en la adolescencia y entre adultos jóvenes. Individuos seropositivos para HSV-1 presentaron mayor riesgo de ser positivos para HSV-2 (15,7% cuando se compararon con los negativos para HSV-1 (4,7%. En el análisis multivariado, el histórico de DST aumentó significativamente (OR=3,2 la probabilidad de seropositividad para HSV-2. CONCLUSIONES: Las seroprevalencias para HSV-1 y para HSV-2 varían con la edad y presentan diferencias significativas entre las regiones de Brasil. Historia anterior de DST es importante factor de riesgo para adquisición de infección por HSV-2.OBJECTIVE: To estimate the seroprevalence of HSV-1 and HSV-2 antibodies in Brazil and to analyze factors associated. METHODS: Cross-sectional study including subjects aged 1-40 years from the general population in four different geographical areas in Brazil between 1996 and 1997. All subjects were stratified by age and gender and 1,090 of them were included in the final analysis. Blood samples were tested for HSV-1 and HSV-2 antibodies by type-specific (gG1 and gG2 ELISA. Frequencies and proportions were described and compared among groups using two-sided Fisher's exact test. A logistic regression analysis was performed to assess the influence of

  13. Value of serum IgG4 in the diagnosis of IgG4-related disease and in differentiation from rheumatic diseases and other diseases.

    Science.gov (United States)

    Yamamoto, Motohisa; Tabeya, Tetsuya; Naishiro, Yasuyoshi; Yajima, Hidetaka; Ishigami, Keisuke; Shimizu, Yui; Obara, Mikiko; Suzuki, Chisako; Yamashita, Kentaro; Yamamoto, Hiroyuki; Hayashi, Toshiaki; Sasaki, Shigeru; Sugaya, Toshiaki; Ishida, Tadao; Takano, Ken-Ichi; Himi, Tetsuo; Suzuki, Yasuo; Nishimoto, Norihiro; Honda, Saho; Takahashi, Hiroki; Imai, Kohzoh; Shinomura, Yasuhisa

    2012-06-01

    IgG4-related disease (IgG4-RD) is a novel disease entity that includes Mikulicz's disease, autoimmune pancreatitis (AIP), and many other conditions. It is characterized by elevated serum IgG4 levels and abundant IgG4-bearing plasmacyte infiltration of involved organs. We postulated that high levels of serum IgG4 would comprise a useful diagnostic tool, but little information is available about IgG4 in conditions other than IgG4-RD, including rheumatic diseases. Several reports have described cutoff values for serum IgG4 when diagnosing IgG4-RD, but these studies mostly used 135 mg/dL in AIP to differentiate from pancreatic cancer instead of rheumatic and other common diseases. There is no evidence for a cutoff serum IgG4 level of 135 mg/dL for rheumatic diseases and common diseases that are often complicated with rheumatic diseases. The aim of this work was to re-evaluate the usual cutoff serum IgG4 value in AIP (135 mg/dL) that is used to diagnose whole IgG4-RD in the setting of a rheumatic clinic by measuring serum IgG4 levels in IgG4-RD and various disorders. We therefore constructed ROC curves of serum IgG4 levels in 418 patients who attended Sapporo Medical University Hospital due to IgG4-RD and various rheumatic and common disorders. The optimal cut-off value of serum IgG4 for a diagnosis of IgG4-RD was 144 mg/dL, and the sensitivity and specificity were 95.10 and 90.76%, respectively. Levels of serum IgG4 were elevated in IgG4-RD, Churg-Strauss syndrome, multicentric Castleman's disease, eosinophilic disorders, and in some patients with rheumatoid arthritis, systemic sclerosis, chronic hepatitis, and liver cirrhosis. The usual cut-off value of 135 mg/dL in AIP is useful for diagnosing whole IgG4-RD, but high levels of serum IgG4 are sometimes observed in not only IgG4-RD but also other rheumatic and common diseases.

  14. Does the Maternal Serum IgG Level during Pregnancy in Primary Antibody Deficiency Influence the IgG Level in the Newborn?

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    Vasantha Nagendran

    2015-01-01

    Full Text Available Purpose. To find out if the serum IgG level in the newborn baby was affected by low maternal serum IgG during pregnancy in two newly diagnosed primary antibody deficient patients. Method. Infant cord blood IgG level was compared with maternal IgG level in 2 mothers with newly diagnosed primary antibody deficiency, who declined replacement IgG treatment during pregnancy. Results. Both mothers delivered healthy babies with normal IgG levels at birth. Conclusions. The normal IgG levels and sound health in these 2 babies in spite of low maternal IgG throughout pregnancy raise interesting discussion points about maternofoetal immunoglobulin transport mechanisms in primary antibody deficiency.

  15. Immunohistochemical Characteristics of IgG4-Related Tubulointerstitial Nephritis: Detailed Analysis of 20 Japanese Cases

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    Mitsuhiro Kawano

    2012-01-01

    Full Text Available Although tubulointerstitial nephritis with IgG4+ plasma cell (PC infiltration is a hallmark of IgG4-related kidney disease (IgG4-RKD, only a few studies are available about the minimum number of IgG4+ PC needed for diagnosis along with IgG4+/IgG+ PC ratio in the kidney. In addition, the significance of the deposition of IgG or complement as a reflection of humoral immunity involvement is still uncertain. In this study, we analyzed 20 Japanese patients with IgG4-RKD to evaluate the number of IgG4+ PCs along with IgG4+/IgG+ PC ratio and involvement of humoral immunity. The average number of IgG4+ PCs was 43.8/hpf and the average IgG4+/IgG+ or IgG4+/CD138+ ratio was 53%. IgG and C3 granular deposits on the tubular basement membrane (TBM were detected by immunofluorescence microscopy in 13% and 47% of patients, respectively. Nine patients had a variety of glomerular lesions, and 7 of them had immunoglobulin or complement deposition in the glomerulus. In conclusion, we confirmed that infiltrating IgG4+ PCs > 10/hpf and/or IgG4/IgG (CD138+ PCs > 40% was appropriate as an item of the diagnostic criteria for IgG4-RKD. A relatively high frequency of diverse glomerular lesions with immunoglobulin or complement deposits and deposits in TBM may be evidence of immune complex involvement in IgG4-related disease.

  16. Acute Painful Ptosis Secondary to IgG4 Dacryoadenitis

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    Rumana Hussain

    2016-02-01

    Full Text Available A 48-year-old lorry driver presented with 3 weeks of blurred vision, pain and diplopia. There was a right upper lid ptosis with some restriction of eye movements. A CT revealed an enlarged lacrimal gland and lacrimal gland biopsy showed IgG4-positive plasma cells. The patient responded to oral prednisolone and fully recovered. As a condition which mimics a number of diseases, an IgG4-related disease presents a diagnostic challenge and ought to be considered in both acute and chronic presentations.

  17. Hantavirus antibodies in rodents and human cases with pulmonary syndrome, Río Negro, Argentina Anticuerpos contra hantavirus en roedores y casos humanos con síndrome pulmonar, Río Negro, Argentina

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    Edmundo Larrieu

    2008-10-01

    Full Text Available In Río Negro Province, Argentina, human cases of hantavirus pulmonary syndrome (HPS appeared in the region of subantartic forests. The Andes virus (ANDV has been identified in the region both in Oligoryzomys longicaudatus rodents and in humans, with the main transmission being from rodents to humans but also showing the possibility of human to human transmission. Between 1996 and 2004, in 40 campaigns, 29.960 night-traps for capturing live rodents were set up. Blood samples were obtained from the rodents and processed using enzyme immunoassay with recombinant antigens made from ANDV. A total of 1767 rodents were captured, with a capture success of 5.9% and an antibody prevalence of 2.1%. Important differences were observed among the species captured from Andes and Steppe regions. Seropositive Oligoryzomys longicaudatus, Abrotrix olivaceus, Abrotrix xanhtothinus and Loxodontomus microtus were captured. During the 1993-2004 period, 40 HPS cases were registered.En la Provincia de Río Negro, Argentina, se presentaron casos humanos de síndrome pulmonar por hantavirus (SPH en la región de los bosques subantárticos. El virus Andes (AND fue identificado en la región, tanto en el roedor Oligoryzomys longicaudatus como en seres humanos, demostrándose la transmisión principalmente del roedor al hombre y la posibilidad de la transmisión de persona a persona. Para ello, se procedió a la colocación de 29.960 trampas para captura viva de roedores, tipo Sherman, en 40 operativos efectuados desde 1996 hasta 2004. Se obtuvieron muestras de sangre de los roedores, las que fueron procesadas mediante enzimoinmunoensayo con antígenos recombinantes elaborados a partir de virus AND. Fueron capturados 1767 roedores, con un éxito de trampeo del 5.9% y una prevalencia de anticuerpos contra hantavirus del 2.1%. Se observaron importantes diferencias en las especies capturadas en cada una de las regiones. Se capturaron O. longicaudatus, Abrothrix olivaceus y

  18. [Hypertrophic pachymeningitis secondary to IgG4-related disease: case report and review of the literature].

    Science.gov (United States)

    Rodríguez-Castro, Emilio; Fernández-Lebrero, Aida; López-Dequidt, Iria A; Rodríguez-Osorio, Xiana; López-González, Francisco J; Suárez-Peñaranda, José M; Arias, Manuel

    2015-10-01

    Introduccion. La paquimeningitis hipertrofica es un trastorno infrecuente que produce un engrosamiento focal o difuso de la duramadre. Puede ser idiopatica o secundaria a procesos infecciosos, autoinmunes o neoplasicos. La recientemente descrita 'enfermedad relacionada con IgG4' podria ser la causa de bastantes cuadros considerados criptogenicos. Caso clinico. Mujer de 54 años, con historia de asma bronquial, que consulto por cefalea, vertigo y perdida de audicion por su oido izquierdo. En la resonancia magnetica cerebral con gadolinio se objetivo engrosamiento y realce dural, que se extendia desde la pared lateral del seno cavernoso izquierdo y la parte medial del lobulo temporal al angulo pontocerebeloso y parte del tentorio homolaterales. El liquido cefalorraquideo presentaba 10 leucocitos/µL (90% mononucleares), con 1 g/L de proteinas y sin consumo de glucosa. El estudio anatomopatologico mostro fibrosis y un infiltrado linfoplasmocitario, con 16 celulas plasmaticas IgG4+ por campo de gran aumento. El resto de estudios analiticos y microbiologicos resultaron normales o negativos. La tasa plasmatica de IgG4 estaba dentro de los limites normales. Tratada con esteroides, se produjo mejoria clinica acompañada de la practica desaparicion de las alteraciones detectadas en la neuroimagen. Conclusiones. La paquimeningitis hipertrofica como manifestacion de la enfermedad relacionada con IgG4 puede diagnosticarse basandose en los hallazgos de la resonancia magnetica si la IgG4 plasmatica esta elevada. En casos dudosos, habra que recurrir a la biopsia meningea. La corticoterapia suele ser eficaz y representa la primera linea terapeutica.

  19. A small subgroup of Hashimoto's thyroiditis is associated with IgG4-related disease.

    Science.gov (United States)

    Jokisch, Friedrich; Kleinlein, Irene; Haller, Bernhard; Seehaus, Tanja; Fuerst, Heinrich; Kremer, Marcus

    2016-03-01

    IgG4-related disease is a newly identified syndrome characterized by high serum IgG4 levels and increased IgG4-positive plasma cells in involved organs. The incidence of IgG4-related thyroiditis in the Caucasian population of Europe is unknown. We investigated formalin-fixed thyroid gland samples of 216 patients (191 Hashimoto's thyroiditis, 5 Riedel's thyroiditis, and 20 goiters, as controls), morphologically, and immunohistochemically. Cases were divided into two groups: IgG4-related Hashimoto's thyroiditis (24 cases) together with Riedel thyroiditis (1 case) and 171 non-IgG4-related thyroiditis. Compared to the non-IgG4-related cases, IgG4-related thyroiditis showed a higher IgG4/IgG ratio (0.6 vs. 0.1, p thyroiditis was diagnosed in 23 of the 24 IgG4-related cases (96 %) and in 13 of 167 (18 %, p > 0.001) non-IgG4-related cases. The single case of IgG4-related Riedel's thyroiditis also showed a higher median IgG4 plasma cell count (56.3 vs. 14.3) and a higher IgG4/IgG ratio (0.5 vs. 0.2) than the four cases of non-IgG4-related Riedel's thyroiditis. Our data suggests the incidence of IgG4-related disease (IgG4-RD) of the thyroid gland in Europe is considerably lower than that observed in other studies. A significant elevation of IgG4-positive plasma cells was only found in a small group of Hashimoto's thyroiditis and then accompanied by intense fibrosis, indicating an association with IgG4-RD. Morphologically, IgG4-RD of the thyroid gland differs from that in other organ systems, exhibiting a dense fibrosis without intense eosinophilia or obliterative phlebitis.

  20. Results of anti-Toxoplasma gondii IgG, IgM, IgA and IgG Avidity testing in pregnant women in Rome, Italy

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    Carla Nisii

    2012-12-01

    Full Text Available To evaluate the incidence of Toxoplasma gondii infection, the detection of specific IgG, IgM, IgA and IgG avidity was performed on 1424 pregnant women referred to the “L. Spallanzani” Hospital in Rome (Italy. Of the 1424 women screened, 20 (1.40% were likely to have been recently infected (presence of IgM/IgA, and/or low IgG avidity, 29 (2.04% had positive IgM coupled with high IgG avidity, 7 (0.49% had an unspecific result for IgM alone, 1339 (94.0%, were negative for both IgG and IgM, 29 (2.04% showed evidence of past infection (IgG positive, IgM negative, high IgG avidity. In Conclusion our results underscore the importance of efficient antenatal screening and appropriate treatment for Toxoplasma infection in Italy.

  1. PRODUCCIÓN DE LA PROTEÍNA DE CHOQUE TÉRMICO HSC70 RECOMBINANTE EN Escherichia Coli BL21(DE3 PARA GENERAR ANTICUERPOS POLICLONALES PRODUCTION OF RECOMBINANT HEAT SHOCK PROTEIN HSC70 IN Escherinchia coli BL21(DE3 TO OBTAIN POLYCLONAL ANTIBODIES

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    Rocio Cely Castro

    2006-07-01

    Full Text Available Antecedentes. Los organismos vivos responden al estrés aumentando la síntesis de proteínas. El estrés por choque térmico ha sido el más estudiado y las proteínas que se inducen, se han denominado genéricamente como proteínas de choque térmico. Objetivo.En este trabajo se establecieron las condiciones óptimas de producción de la proteína HSC70, expresada en E.coli BL21 (DE3 y de los anticuerpos policlonales que permitan identificarla. Material y métodos. Mediante varios ensayos se establecieron las concentraciones óptimas del agente inductor isopropil- -D-thiogalacto­piranosido (PTG, del inóculo bacteriano, de empleo de los plásmidos de expresión pET-3a y pET-28a (+; y el método más eficiente para la recuperación de las formas soluble o insoluble de la proteína y de anticuerpos policlonales que la identifiquen. Resultados. Encontramos que el inóculo de cinco colonias con IPTG (2mM en tubos con cinco mililitros de medio modificado e incubadas por 24 horas a 37°C con agitación constante (200 r.p.m y tratamiento de sonicación, produce el mejor rendimiento de HSC70. La calidad de la proteína inducida se estableció mediante “Western blotting”. Conclusión. La proteína recombinante así obtenida permitió, generar anticuerpos policlonales que a su vez permiten detectar la proteína HSC70 natural en la membrana citoplasmática de diferentes células por inmunofluorescencia, en ELISA, en Western Blot y en pruebas de bloqueo de infección de rotavirus.Background. Live organisms respond against stressing conditions raising the production of stress proteins. The heat shock stress is a very well kwon condition that produces heat shock proteins. Objective. In this work we determined the optimum conditions to produce HSC70 protein in E. coli BL12 (DE3 under stress conditions, and the best way to obtain its polyclonal antibodies. Materials and methods. The best concen­trations for isopropyl- ß -D

  2. Frecuencia de anticuerpos contra el virus C de la hepatitis en pacientes con cirrosis hepática en Yucatán, México

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    Góngora-Biachi Renán A

    2003-01-01

    Full Text Available OBJETIVO: En este estudio reportamos la prevalencia de anticuerpos contra el virus C de la hepatitis (Ac-VCH en un grupo de pacientes con cirrosis hepática (CH. MATERIAL Y MÉTODOS: Se hizo un estudio prospectivo, transversal y descriptivo, de marzo de 1998 a mayo de 1999. Se estudiaron a 153 pacientes (117 (76% hombres y 36 (24% mujeres con diagnóstico de CH, que eran atendidos en el Hospital General Agustín O' Horan y en el Centro de Investigaciones Regionales Doctor Hideyo Noguchi, en la ciudad de Mérida, Yucatán, México. Se aplicó un cuestionario con datos clínico-epidemiológicos y se determinó la presencia de Ac-VCH (ELISA de 2ª generación y RIBA-2 para confirmar el diagnóstico a cada paciente. Se determinó también el antígeno de superficie de la hepatitis B (AgsHB y anticuerpos contra el antígeno central de la hepatitis B (Anti-HBc mediante el método de ELISA. La presencia de Ac-VCH fue relacionada con las variables epidemiológicas de los sujetos. La prevalencia de anti-HCV y la frecuencia de características se compararon entre los pacientes positivos y negativos con las pruebas de c² y exacta de Fisher. RESULTADOS: El 32% de los pacientes con CH (35/117 (30% hombres y 14/36 (39% mujeres fueron positivos para los Ac-VCH. El alcoholismo estuvo presente en todos los hombres serorreactivos y en ninguna de las mujeres positivas (p< 0.001. Ninguna de las variables epidemiológicas analizadas estuvo asociada con la seropositividad. Los anti-HBc se encontraron en 16% de los pacientes positivos para Ac-VCH y en 12% de los seronegativos (p=0.69. CONCLUSIONES: La prevalencia encontrada fue mayor a los reportes previos realizados en población general de la Península de Yucatán (1.3%. La alta prevalencia de Ac-VCH en este grupo de pacientes sugiere que la CH está más frecuentemente asociada con el VCH en Yucatán, México, que con el virus B de la hepatitis. El alcoholismo probablemente actúa como un cofactor en el

  3. Half molecular exchange of IgGs in the blood of healthy humans: chimeric lambda-kappa-immunoglobulins containing HL fragments of antibodies of different subclasses (IgG1-IgG4).

    Science.gov (United States)

    Sedykh, Sergey E; Lekchnov, Evgenii A; Prince, Viktor V; Buneva, Valentina N; Nevinsky, Georgy A

    2016-10-20

    In the classic paradigm, immunoglobulins represent products of clonal B cell populations, each producing antibodies recognizing a single antigen (monospecific). There is a common belief that IgGs in mammalian biological fluids are monospecific molecules having stable structures and two identical antigen-binding sites. But the issue concerning the possibility of exchange by HL-fragments between the antibody molecules in human blood is still unexplored. Different physico-chemical and immunological methods for analysis of half-molecule exchange between human blood IgGs were used. Using eighteen blood samples of healthy humans we have shown unexpected results for the first time: blood antibodies undergo extensive post-transcriptional half-molecule exchange and IgG pools on average consist of 62.4 ± 6.5% IgGs containing kappa light chains (kappa-kappa-IgGs), 29.8.6 ± 5.4% lambda light chains (lambda-lambda-IgGs), and 8.8 ± 2.7% (range 2.6-16.8%) IgGs containing both kappa- and lambda-light chains. Kappa-kappa-IgGs and lambda-lambda-IgGs contained on average (%): IgG1 (36.0 and 32.3), IgG2 (50.9 and 51.4), IgG3 (9.7 and 9.9), and IgG4 (6.5 and 5.7), while chimeric kappa-lambda-IgGs consisted of (%): 25.5 ± 4.2 IgG1, 50.8 ± 3.9 IgG2, 9.1 ± 2.1 IgG3, and 14.5 ± 2.2 IgG4. Our unexpected data are indicative of the possibility of half-molecule exchange between blood IgGs of various subclasses, raised against different antigens. The existence of blood chimeric bifunctional IgGs with different binding sites destroys the classic paradigm. Due to the phenomenon of polyspecificity and cross-reactivity of bifunctional IgGs containing HL-fragments of different types to different antigens, such IgGs may be important in human blood for widening their different biological functions.

  4. Auto-anticorpos anti-β2-glicoproteína I e síndrome metabólica Anticuerpos anti-β2-glicoproteína I y síndrome metabólico Anti-beta2-glycoprotein I autoantibodies and metabolic syndrome

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    Rodrigo B. Krás Borges

    2011-04-01

    Full Text Available FUNDAMENTO: A síndrome metabólica (SM é uma entidade pró-aterogênica. Autoanticorpos tais como β2-glicoproteína I (β2-gpI podem influenciar o aparecimento de ateromas. Estudos anteriores confirmaram uma associação entre anticorpos IgA anti-β2-gpI e isquemia cerebral, infarto do miocárdio, doença arterial periférica e doença da carótida. OBJETIVO: O objetivo desse estudo de caso-controle foi avaliar uma possível associação entre anticorpos anti-β2-gpI e anticardiolipina (aCL com SM não-complicada. MÉTODOS: Pacientes com SM sem histórico de eventos vasculares e indivíduos-controle, consistindo em pacientes da Enfermaria de Ortopedia admitidos devido a doenças musculoesqueléticas foram incluídos no estudo. Idade, sexo, etnia, histórico de hipertensão, tabagismo, hipercolesterolemia e diabetes mellitus foram avaliados como fatores de risco em ambos os grupos. Anticorpos IgG, IgM, e IgA anti-β2-gpI e aCL foram detectados através de imunoensaios enzimáticos. RESULTADOS: Um total de 68 pacientes com SM e 82 controles foram estudados. Os pacientes com SM tinham média de idade superior à dos controles (P = 0,001, enquanto homens (P = 0,003; OR 0,31; IC95%: 0,15-0,16 e etnia caucasiana (P = 0,004; OR 0,25; IC95%:0,10-0,60 eram predominantes nos controles. Histórico de hipertensão, hipercolesterolemia e diabetes mellitus foi mais prevalente nos pacientes com SM do que nos controles (P FUNDAMENTO: El síndrome metabólico (SM es una entidad pro-aterogénica. Autoanticuerpos tales como β2-glicoproteína I (β2-GPI pueden influir en la aparición de ateromas. Estudios previos han confirmado una asociación entre anticuerpos IgA anti-β2-GPI y la isquemia cerebral, infarto de miocardio, enfermedad arterial periférica y enfermedad carotidea. OBJETIVO: El objetivo de este estudio de caso-control fue evaluar una posible asociación entre los anticuerpos anti-β2-GPI y anticardiolipina (aCL con SM complicada. MÉTODOS: Se

  5. Utilización de un anticuerpo monoclonal en el diagnóstico directo e indirecto del virus IPN en peces infectados experimentalmente Utilization of a monoclonal antibody in the diagnosis of infectious pancreatic necrosis virus in fish

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    F. CIFUENTES

    1999-01-01

    Full Text Available El virus de la necrosis pancreática infecciosa, virus IPN, es el agente causal de una enfermedad altamente contagiosa que afecta a peces salmonídeos jóvenes, éstos cuando sobreviven pueden convertirse en portadores que pueden transmitir la enfermedad. Para contribuir al diagnóstico rápido y efectivo del virus tanto en peces con la infección aguda, como en peces portadores, es que ensayamos la aplicación de un anticuerpo monoclonal en la detección del virus en animales infectados experimentalmente. Utilizamos alevines de truchas arcoiris (Oncorhynchus mykiss y de salmones coho (Oncorhynchus kisutch infectados con virus IPN aislado en Chile. Para detectar a los antígenos virales empleamos ensayos de ELISA inmunodot e inmunofluorescencia. Los resultados muestran que en los peces con la enfermedad aguda el virus se detecta aplicando directamente los inmunoensayos en extractos de peces enteros. En cambio, para detectar al virus en los peces portadores fue necesario incorporar un paso adicional para amplificar al virus en cultivos celulares. A pesar de lo cual, sin embargo, los métodos se optimizaron de manera que el procedimiento completo se realizó en menos de tres días para ELISA e inmunodot y menos de un día y medio para la inmunofluorescencia. Debido a que la técnica de inmunofluorescencia permite la identificación inequívoca de una o pocas células infectadas, es que ensayamos condiciones para diagnosticar al virus IPN desde improntas de peces portadores del virus. Demostramos que los antígenos virales pueden ser facilmente identificados por medio de la tinción directa de improntas de órganos de peces con el tamaño adecuadoThe infectious pancreatic necrosis virus, IPNV, is the etiological agent of a highly contagious disease that affects young salmon. If they survive, they become carriers and can transmit the disease. To contribute to the fast and effective diagnosis in fish with the acute infection, as well as of carrier

  6. IgGs containing light chains of the lambda and kappa type and of all subclasses (IgG1-IgG4) from sera of patients with multiple sclerosis hydrolyze DNA.

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    Parkhomenko, Taisiya A; Legostaeva, Galina A; Doronin, Boris M; Buneva, Valentina N; Nevinsky, Georgy A

    2010-01-01

    We present the first evidence demonstrating that small fractions of IgGs of all four subclasses (IgG1-IgG4) are catalytically active in the hydrolysis of DNA and on average their relative activity (nM supercoiled DNA/1mg IgG/1 h) increases in the order: IgG1 (0.58) light chains of the lambda-type are severalfold more active in the hydrolysis of DNA than IgGs with light chains of the kappa-type. Using different physicochemical methods of antibody analysis we have shown that the immune system of multiple sclerosis patients generates a variety of anti-DNA abzymes of different type and with different catalytic properties, which can play an important role in multiple sclerosis pathogenesis.

  7. Spectrum of Disorders Associated with Elevated Serum IgG4 Levels Encountered in Clinical Practice

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    Jay H. Ryu

    2012-01-01

    Full Text Available IgG4-related disease (IgG4-RD is a recently described systemic fibroinflammatory disease associated with elevated circulating levels of IgG4 and manifests a wide spectrum of clinical presentations. Although serum IgG4 level has been described to be the most sensitive and specific laboratory test for the diagnosis of IgG4-RD, it is recognized that an elevated serum IgG4 level can be encountered in other diseases. In this study, we sought to identify the frequency of IgG4-RD and other disease associations in patients with elevated serum IgG4 levels seen in clinical practice. Among 3,300 patients who underwent IgG subclass testing over a 2-year period from January 2009 to December 2010, 158 (4.8% had an elevated serum IgG4 level (>140 mg/dL. IgG4 subclass testing was performed for evaluation of suspected IgG4-RD or immunodeficiency. Twenty-nine patients (18.4% had definite or possible IgG4-RD. Among those patients without IgG4-RD, a broad spectrum of biliary tract, pancreatic, liver, and lung diseases, as well as systemic vasculitis, was diagnosed. We conclude that patients with elevated serum IgG4 levels encountered in clinical practice manifest a wide array of disorders, and only a small minority of them has IgG4-RD.

  8. Rinitis alérgica en niños. Su relación con alergenos en el ambiente.

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    Marco A. Reyes

    2009-10-01

    Full Text Available La rinitis alérgica es una entidad frecuente en niños. Se asocia con otros síndromes alérgicos como asma, dermatitis atópica, sinusitis, conjuntivitis. Se caracteriza por inflamación crónica de la mucosa nasal debida a la liberación de enzimas producidas por la interacción de anticuerpos IgE que sensibilizan mastocitos y células inflamatorias y alergenos, enzimas que actúan sobre vasos, glándulas y receptores neurogénicos. Los aereoalergenos varían de un lugar a otro. En Cali, 264 niños con rinitis alérgica, cuyo rango de edad estaba entre 2 y 14 años, se investigaron por medio de historia clínica, pruebas cutáneas de escarificación para aereoalergenos, anticuerpos IgE y citología del moco nasal. En orden de importancia los ácaros ocuparon el primer lugar (y entre ellos se destacó Blomia tropicalis, un ácaro en estudio en varios lugares del mundo, y luego el polvillo de insectos caseros, cucarachas y mosquitos, pólenes de pastos, caspa de animales domésticos (gatos, perros y mohos ambientales como los más frecuentes. Se demostró el anticuerpo IgE en 45% de los niños y muy alto en 15%, asociado con asma en 14 casos y en 5 con dermatitis atópica. El moco nasal en 54% de los pacientes fue positivo para eosinófilos.

  9. IgG4-related epididymo-orchitis associated with bladder cancer: possible involvement of BAFF/BAFF-R interaction in IgG4-related urogenital disease.

    Science.gov (United States)

    Migita, Kiyoshi; Miyashita, Taiichiro; Mizuno, Aya; Jiuchi, Yuka; Ito, Masahiro; Matsuo, Manabu; Izumi, Yasumori; Takeoka, Atsushi; Nishino, Ayako; Hayashi, Mikio

    2014-01-01

    We describe herein a patient who presented with immunoglobulin G4-related disease (IgG4-RD) involving the testis and prostate as well as the submandibular glands. Massive infiltration of IgG4-expressing plasma cells was observed in testis and prostate tissues. Serum concentrations of B cell activating factor belonging to the tumor necrosis factor family (BAFF) were elevated in parallel with serum IgG4 concentrations, and infiltration of BAFF-receptor (BAFF-R)-expressing B cells and BAFF-expressing lymphoid cells was observed around the ectopic lymphoid foci in the affected urogenital tissues. To date, testicular involvement in a patient diagnosed with IgG4-RD had not been reported, making this the first reported case of IgG4-related epididymo-orchitis. These findings suggest that the immune mechanism underlying ectopic lymphoneogenesis in IgG4-RD may involve enhanced BAFF/BAFF-R interactions among lymphoid cells.

  10. Specific IgG(4) responses during chronic and transient antigen exposure in aspergillosis

    NARCIS (Netherlands)

    Tomee, JFC; Dubois, AEJ; Koeter, GH; Beaumont, F; vanderWerf, TS; Kauffman, HF

    1996-01-01

    The factors that lead to increased production of specific IgG subclasses are still largely unknown. Recent studies suggest that increased IgG(4) responses may be related to prolonged antigen exposure. We present data showing that increased IgG(4) responses are found under conditions of chronic expos

  11. On the Perplexingly Low Rate of Transport of IgG2 across the Human Placenta

    NARCIS (Netherlands)

    Einarsdottir, Helga K.; Stapleton, Nigel M.; Scherjon, Sicco; Andersen, Jan Terje; Rispens, Theo; van der Schoot, C. Ellen; Vidarsson, Gestur

    2014-01-01

    The neonatal receptor, FcRn, mediates both serum half-life extension as well as active transport of maternal IgG to the fetus during pregnancy. Therefore, transport efficiency and half-life go hand-in-hand. However, while the half-life of the human IgG2 subclass is comparable to IgG1, the placental

  12. Genetic and infectious profiles influence cerebrospinal fluid IgG abnormality in Japanese multiple sclerosis patients.

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    Satoshi Yoshimura

    Full Text Available BACKGROUND: Abnormal intrathecal synthesis of IgG, reflected by cerebrospinal fluid (CSF oligoclonal IgG bands (OBs and increased IgG index, is much less frequently observed in Japanese multiple sclerosis (MS cohorts compared with Western cohorts. We aimed to clarify whether genetic and common infectious backgrounds influence CSF IgG abnormality in Japanese MS patients. METHODOLOGY: We analyzed HLA-DRB1 alleles, and IgG antibodies against Chlamydia pneumoniae, Helicobacter pylori, Epstein-Barr virus nuclear antigen (EBNA, and varicella zoster virus (VZV in 94 patients with MS and 367 unrelated healthy controls (HCs. We defined CSF IgG abnormality as the presence of CSF OBs and/or increased IgG index (>0.658. PRINCIPAL FINDINGS: CSF IgG abnormality was found in 59 of 94 (62.8% MS patients. CSF IgG abnormality-positive patients had a significantly higher frequency of brain MRI lesions meeting the Barkhof criteria compared with abnormality-negative patients. Compared with HCs, CSF IgG abnormality-positive MS patients showed a significantly higher frequency of DRB1 1501, whereas CSF IgG abnormality-negative patients had a significantly higher frequency of DRB1 0405. CSF IgG abnormality-positive MS patients had a significantly higher frequency of anti-C. pneumoniae IgG antibodies compared with CSF IgG abnormality-negative MS patients, although there was no difference in the frequency of anti-C. pneumoniae IgG antibodies between HCs and total MS patients. Compared with HCs, anti-H. pylori IgG antibodies were detected significantly less frequently in the total MS patients, especially in CSF IgG abnormality-negative MS patients. The frequencies of antibodies against EBNA and VZV did not differ significantly among the groups. CONCLUSIONS: CSF IgG abnormality is associated with Western MS-like brain MRI features. DRB1 1501 and C. pneumoniae infection confer CSF IgG abnormality, while DRB1 0405 and H. pylori infection are positively and negatively

  13. [Raise awareness of IgG4 relative ocular disease].

    Science.gov (United States)

    Wei, Shihui; Li, Hongyang

    2015-12-01

    Purpose IgG4-related ocular disease is a chronic systemic disease with lymphocyte abnormal. The lacrimal glands, extraocular muscles and infraorbital nerve were often involved which was often the first symptom of systemic disease. While ophthalmologists did not know this disease well. They usually misdiagnosed it as idiopathic inflammatory pseudotumor, thyroid-associated ophthalmopathy etc, which resulted in delayed treatments. Here pathogenesis, clinical features and treatment methods of IgG4-relative ocular disease were described in order to improve awareness of this ocular disease, reduce clinical misdiagnosis, improve disease prognosis and standardized treatment. As the incidence of this disease increased in recent years, it is very necessary to improve awareness of the disease for ophthalmologists.

  14. Aggregated IgG inhibits the differentiation of human fibrocytes

    OpenAIRE

    Pilling, Darrell; Tucker, Nancy M.; Gomer, Richard H.

    2006-01-01

    Fibrocytes are fibroblast-like cells, which appear to participate in wound healing and are present in pathological lesions associated with asthma, pulmonary fibrosis, and scleroderma. Fibrocytes differentiate from CD14+ peripheral blood monocytes, and the presence of serum delays this process dramatically. We previously purified the factor in serum, which inhibits fibrocyte differentiation, and identified it as serum amyloid P (SAP). As SAP binds to Fc receptors for immunoglobulin G (IgG; Fcγ...

  15. Serological IgG avidity test for ocular toxoplasmosis

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    Suresh S

    2012-01-01

    Full Text Available Subramaniam Suresh1, Saidin Nor-Masniwati1, Muhd Nor Nor-Idahriani1, Wan-Hitam Wan-Hazabbah1, Mohamed Zeehaida2, Embong Zunaina11Department of Ophthalmology, 2Department of Medical Microbiology and Parasitology, School of Medical Sciences, Universiti Sains Malaysia, Kelantan, MalaysiaBackground: The purpose of this study was to evaluate the immunoglobulin (Ig G avidity of serological toxoplasmosis testing in patients with ocular inflammation and to determine the clinical manifestations of ocular toxoplasmosis.Methods: A retrospective review of all patients presenting with ocular inflammation to the Hospital Universiti Sains Malaysia, Kelantan, Malaysia between 2005 and 2009 was undertaken. Visual acuity, clinical manifestations at presentation, toxoplasmosis antibody testing, and treatment records were analyzed.Results: A total of 130 patients with ocular inflammation were reviewed retrospectively. The patients had a mean age of 38.41 (standard deviation 19.24, range 6–83 years. Seventy-one patients (54.6% were found to be seropositive, of whom five (3.8% were both IgG and IgM positive (suggestive of recently acquired ocular toxoplasmosis while one (0.8% showed IgG avidity ≤40% (suggestive of recently acquired ocular toxoplasmosis and 65 patients (50.0% showed IgG avidity >40% (suggestive of reactivation of toxoplasmosis infection. Chorioretinal scarring as an ocular manifestation was significantly more common in patients with seropositive toxoplasmosis (P = 0.036. Eighteen patients (13.8% were diagnosed as having recent and/or active ocular toxoplasmosis based on clinical manifestations and serological testing.Conclusion: Ocular toxoplasmosis is a clinical diagnosis, but specific toxoplasmosis antibody testing helps to support the diagnosis and to differentiate between reactivation of infection and recently acquired ocular toxoplasmosis.Keywords: ocular toxoplasmosis, chorioretinal scar, toxoplasmosis antibody, IgG avidity test

  16. IgG and IgG subclass specific antibody responses to diphtheria and tetanus toxoids in newborns and infants given DTP immunization.

    Science.gov (United States)

    Dengrove, J; Lee, E J; Heiner, D C; St Geme, J W; Leake, R; Baraff, L J; Ward, J I

    1986-08-01

    To evaluate immune responses to diphtheria and tetanus toxoids in infants we used enzyme-linked immunosorbent assays to detect total IgG and specific IgG-1, IgG-2, IgG-3, and IgG-4 antibody. One group of infants received a newborn dose and subsequently received the usual three doses of DTP. A second group of infants received only the routine dosage at 2, 4, and 6 months of age. In sera acquired at birth, 6, and 9 months of age, there were no statistically significant differences between the two vaccine groups in IgG antibody responses to diphtheria or tetanus, or in IgG subclass tetanus-specific antibody responses. In individual children, tetanus-specific subclass responses were similar in pattern to that for total IgG tetanus antibody, i.e. each IgG subclass response appeared to be regulated by similar mechanisms in that child, but the regulation differed between children. In contrast to a prior study of pertussis immunity, maternally acquired antibody did not significantly affect immune responses to diphtheria or tetanus toxoid by 9 months of age. There was no discernible tolerance due to early tetanus or diphtheria immunization or to high levels of maternally acquired antibody.

  17. Evaluation of IgG4 and total IgG antibodies against cysticerci and peptide antigens for the diagnosis of human neurocysticercosis by ELISA.

    Science.gov (United States)

    Intapan, Pewpan M; Khotsri, Piyarat; Kanpittaya, Jaturat; Chotmongkol, Verajit; Maleewong, Wanchai; Morakote, Nimit

    2008-12-01

    To support the clinical diagnosis of human neurocysticercosis (NCC), we evaluated two peptides, HP6-3 and Ts45W-1, as well as crude saline extract (SE) of Tenia solium cysticerci as antigens for the detection of specific IgG4 subclass and total IgG antibodies by an enzyme-linked immunosorbent assay (ELISA). The sera of definitive diagnosed NCC patients, patients infected with other parasitoses and healthy controls were examined. The diagnostic sensitivity for IgG4 and total IgG detection of the ELISA against SE antigen was 100% and 64.3% with a high amount of cross-reactions to taeniasis saginata at 88.9% (8/9) and 100% (9/9), respectively. The SE-based IgG4-ELISA showed the highest specificity (80.9%). Both peptide-based IgG4-ELISAs provided a superior sensitivity (78.6%) to the total IgG tests whereas their specificity was 66.7% for HP6-3 and 69.8% for Ts45W-1 only. The SE-based ELISA for the detection of specific IgG4 antibody can be used for the diagnosis of neurocysticercosis as well as for serological surveys of NCC endemic areas. The peptide-based IgG4 ELISAs potentially provide a reliable and cost effective alternative method independent from live parasite supply.

  18. Granulocyte-associated IgG in neutropenic disorders

    Energy Technology Data Exchange (ETDEWEB)

    Cines, D.B.; Passero, F.; Guerry, D. IV; Bina, M.; Dusak, B.; Schreiber, A.D

    1982-01-01

    We applied a radiolabeled antiglobulin test to a study of patients with a variety of neutropenic disorders. After defining the nature of the interaction of radiolabeled anti-IgG with the neutrophil, we studied 16 patients with neutropenia of uncertain etiology and adequate bone marrow granulocyte precursors. Twelve of these 16 patients had increased neutrophil-associated IgG (PMN-IgG). Patients with the highest levels of PMN-IgG had the lowest neutrophil counts. The majority of patients with neutropenia and increased PMN-IgG had an underlying immunologic disorder that included immune thrombocytopenic purpura in 5 patients and autoimmune hemolytic anemia in 1 patient. In some patients, elevated PMN-IgG preceded other evidence for immunologic disease. The direct antiglobulin test helped to distinguish neutropenic patients with increased PMN-IgG both from patients with neutropenia due to a known nonimmune disorder and from noneutropenic patients with rheumatoid arthritis or systemic lupus erythematosis. Each of four patients with increased neutrophil-associated IgG treated with systemic corticosteroids responded clinically with an associated fall in neutrophil IgG and a rise in the circulating neutrophil count. The radiolabeled antiglobulin test appears useful in defining a subpopulation of patients with neutropenia due to an underlying immunologic disorder.

  19. Granulocyte-associated IgG in neutropenic disorders

    Energy Technology Data Exchange (ETDEWEB)

    Cines, D.B.; Passero, F.; Guerry, D.; Bina, M.; Dusak, B.; Schreiber, A.D.

    1982-01-01

    We applied a radiolabeled antiglobulin test to a study of patients with a variety of neutropenic disorders. After defining the nature of the interaction of radiolabeled anti-IgG with the neutrophil, we studied 16 patients with neutropenia of uncertain etiology and adequate bone marrow granulocyte precursors. Twelve of these 16 patients had increased neutrophil-associated IgG (PMN-IgG). Patients with the highest levels of PMN-IgG had the lowest neutrophil counts. The majority of patients with neutropenia and increased PMN-IgG had an underlying immunologic disorder that included immune thrombocytopenic purpura in 5 patients and autoimmune hemolytic anemia in 1 patient. In some patients, elevated PMN-IgG preceded other evidence for immunologic disease. The direct antiglobulin test helped to distinguish neutropenic patients with increased PMN-IgG both from patients with neutropenia due to a known nonimmune disorder and from nonneutropenic patients with rheumatoid arthritis or systemic lupus erythematosis. Each of four patients with increased neutrophil-associated IgG treated with systemic corticosteroids responded clinically with an associated fall in neutrophil IgG and a rise in the circulating neutrophil count. The radiolabeled antiglobulin test appears useful in defining a subpopulation of patients with neutropenia due to an underlying immunologic disorder.

  20. IgG4检测在IgG4相关性疾病的新进展%Value of serum IgG4 in IgG4-related disease

    Institute of Scientific and Technical Information of China (English)

    荆红运; 关秀茹

    2016-01-01

    Immunoglobulin G4(IgG4)-related disease (IgG4-RD) is a new systemic and chronic autoimmune disease.It is characterized by increased serum levels of IgG 4 and infiltration of abundant IgG 4-positive cells in various organs and tissues .It is needed to distinguish IgG 4-RD and other diseases which will induce high level of serum IgG4 and infiltration of abundant IgG4-positive cells in tissues.This study described the value of serum IgG4 in IgG4-RD.%IgG4相关性疾病( IgG4-RD)是一种新的系统性、慢性自身免疫性疾病。临床表现为IgG4阳性浆细胞及淋巴细胞浸润多种器官和组织,并伴有血清IgG4水平升高。此外,一些其他疾病也会出现血清IgG4升高或组织中IgG4阳性浆细胞浸润,因此需要进行鉴别诊断。本文论述了血清IgG4对IgG4-RD诊断及鉴别诊断的价值。(中华检验医学杂志,2016,39:817-819)

  1. The Utility of Serum IgG4 Concentrations as a Biomarker

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    Shigeyuki Kawa

    2012-01-01

    Full Text Available IgG4-related disease is a new disease entity involving IgG4 in its clinical presentation and having 6 characteristic features: (1 systemic involvement; (2 solitary or multiple lesions showing diffuse or localized swelling, masses, nodules, and/or wall thickening on imaging; (3 high serum IgG4 concentration >135 mg/dL; (4 abundant infiltration of lymphoplasmacytes and IgG4-bearing plasma cells; (5 a positive response to corticosteroid therapy; and (6 complications of other IgG4-related diseases. To date, most IgG4-related diseases have been recognized as extrapancreatic lesions of autoimmune pancreatitis. This paper will discuss the utility of IgG4 as a biomarker of IgG4-related diseases, including in the diagnosis of autoimmune pancreatitis and its differentiation from pancreatic cancer, in the prediction of relapse, in the long-term follow-up of patients with autoimmune pancreatitis and normal or elevated IgG4 concentrations, and in patients with autoimmune pancreatitis and extrapancreatic lesions, as well as the role of IgG4 in the pathogenesis of IgG4-related disease.

  2. Overlapping Morphologic and Immunohistochemical Features of Hashimoto Thyroiditis and IgG4-Related Thyroid Disease.

    Science.gov (United States)

    Raess, Philipp W; Habashi, Arlette; El Rassi, Edward; Milas, Mira; Sauer, David A; Troxell, Megan L

    2015-05-01

    Immunoglobulin G4-related disease (IgG4-RD) is an emerging clinicopathologic entity characterized by both IgG4+ plasma cell infiltration and fibrosis in one or more organs, prototypically pancreas or salivary/lacrimal glands. IgG4-RD in the thyroid (IgG4-RTD) is an area of active study, and the relationship between IgG4-RTD and Hashimoto thyroiditis is not fully delineated due to their overlapping histologic features. Retrospective review was performed of all thyroidectomy cases demonstrating lymphocytic inflammation at a single institution over a 4-year period. Approximately half (23/38) of patients had a clinical diagnosis of Hashimoto thyroiditis (HT). Nine of the 38 patients had increased absolute and relative numbers of IgG4+ plasma cells. Patients with a clinical diagnosis of HT had increased lymphoplasmacytic inflammation, but the relative proportion of IgG4+ plasma cells was not increased compared to patients without HT. There was no correlation between IgG4 levels and the amount of fibrosis in patients with or without HT. Patients identified as having the fibrosing variant of HT were not more likely to have increased levels of IgG4+ plasma cells than those without. There is significant morphologic and immunohistochemical overlap between HT and IgG4-RTD. Future studies to identify specific characteristics of IgG4-RTD involving the thyroid are necessary to accurately define this entity.

  3. Neuron-derived IgG protects neurons from complement-dependent cytotoxicity.

    Science.gov (United States)

    Zhang, Jie; Niu, Na; Li, Bingjie; McNutt, Michael A

    2013-12-01

    Passive immunity of the nervous system has traditionally been thought to be predominantly due to the blood-brain barrier. This concept must now be revisited based on the existence of neuron-derived IgG. The conventional concept is that IgG is produced solely by mature B lymphocytes, but it has now been found to be synthesized by murine and human neurons. However, the function of this endogenous IgG is poorly understood. In this study, we confirm IgG production by rat cortical neurons at the protein and mRNA levels, with 69.0 ± 5.8% of cortical neurons IgG-positive. Injury to primary-culture neurons was induced by complement leading to increases in IgG production. Blockage of neuron-derived IgG resulted in more neuronal death and early apoptosis in the presence of complement. In addition, FcγRI was found in microglia and astrocytes. Expression of FcγR I in microglia was increased by exposure to neuron-derived IgG. Release of NO from microglia triggered by complement was attenuated by neuron-derived IgG, and this attenuation could be reversed by IgG neutralization. These data demonstrate that neuron-derived IgG is protective of neurons against injury induced by complement and microglial activation. IgG appears to play an important role in maintaining the stability of the nervous system.

  4. Biophysical and Functional Characterization of Rhesus Macaque IgG Subclasses

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    Austin W. Boesch

    2016-12-01

    Full Text Available Antibodies raised in Indian rhesus macaques (Macaca mulatta, MM in many preclinical vaccine studies are often evaluated in vitro for titer, antigen-recognition breadth, neutralization potency, and/or effector function, and in vivo for potential associations with protection. However, despite reliance on this key animal model in translation of promising candidate vaccines for evaluation in first in man studies, little is known about the properties of MM IgG subclasses and how they may compare to human IgG subclasses. Here we evaluate the binding of MM IgG1, IgG2, IgG3, and IgG4 to human FcγR and their ability to elicit the effector functions of human FcγR-bearing cells, and unlike in humans, find a notable absence of subclasses with dramatically silent Fc regions. Biophysical, in vitro, and in vivo characterization revealed MM IgG1 exhibited the greatest effector function activity followed by IgG2 and then IgG3/4. These findings in rhesus are in contrast with the canonical understanding that IgG1 and IgG3 dominate effector function in humans, indicating that subclass-switching profiles observed in rhesus studies may not strictly recapitulate those observed in human vaccine studies.

  5. Responses of IgE, IgG1, and IgG4 to concanavalin A-binding Blomia tropicalis antigens in allergic patients

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    K.C. Almeida

    2006-11-01

    Full Text Available Blomia tropicalis (Bt and Dermatophagoides pteronyssinus (Dp are the prevalent house dust mites in tropical countries and are associated with allergic diseases. Glycosylated antigens are highly immunogenic and involved in different pathologies. We evaluated the presence of IgE, IgG1, and IgG4 to concanavalin A-binding antigens (Bt-Con-A isolated from Bt-total extract in sera of allergic and non-allergic subjects. Bt-total and Bt-Con-A extracts were evaluated by SDS-PAGE and ELISA for reacting with IgE, IgG1, and IgG4 in sera of 121 patients with allergic rhinitis and 36 non-allergic individuals. All subjects were skin prick tested with Bt-total extract and inhibition tests were performed for IgE, IgG1, and IgG4 using both extracts (Bt-total and Bt-Con-A. Skin prick test showed that 58% of the patients were sensitized to Bt (Bt+, with 52% reactive to both mites (Bt and Dp and 6% to Bt only. A broad spectrum of proteins (14-152 kDa was visualized in Bt-total and components >27 kDa for the Bt-Con-A extract. ELISA showed a similar profile of IgE, IgG1 and IgG4 levels in response to Bt-total and Bt-Con-A extracts in different groups, although Bt+ patients showed a lower IgG4 reactivity to Bt-Con-A extract. Specific IgG1 levels were higher in Bt+ patients than in control subjects, and IgG4 levels showed no significant difference among groups. ELISA inhibition showed a partial IgE and total IgG1 and IgG4 cross-reactivity with Dp extract for Bt-total and Bt-Con-A extracts. We conclude that Con-A-binding components isolated from Bt constitute major allergens and are involved in both allergen sensitization (IgE response and homeostasis maintenance (IgG1 and IgG4 responses.

  6. Orbital Pseudotumor: Uncommon Initial Presentation of IgG4-Related Disease

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    Teresa Carbone

    2015-01-01

    Full Text Available IgG4-related disease (IgG4-RD encompasses a group of fibroinflammatory conditions recognized in recent times. The main clinical features include variable degrees of tissue fibrosis, tumorlike expansions, perivascular lymphocytic infiltration rich in IgG4-positive plasma cells, and elevated serum IgG4. A case has been reported of an elderly patient with an unexplained unilateral exophthalmia; biopsy was performed and revealed lymphocytic infiltration, suggesting IgG4-RD. High serum levels of IgG4, in association with a good response to steroid therapy and to the exclusion of other diagnoses, confirmed the hypothesis of orbital pseudotumor by IgG4-RD.

  7. A Case of IgG4-Related Lung Disease Presenting as Interstitial Lung Disease.

    Science.gov (United States)

    Ahn, Jee Hwan; Hong, Sun In; Cho, Dong Hui; Chae, Eun Jin; Song, Joon Seon; Song, Jin Woo

    2014-08-01

    Intrathoracic involvement of immunoglobulin G4 (IgG4)-related disease has recently been reported. However, a subset of the disease presenting as interstitial lung disease is rare. Here, we report a case of a 35-year-old man with IgG4-related lung disease with manifestations similar to those of interstitial lung disease. Chest computed tomography showed diffuse ground glass opacities and rapidly progressive pleural and subpleural fibrosis in both upper lobes. Histological findings showed diffuse interstitial lymphoplasmacytic infiltration with an increased number of IgG4-positive plasma cells. Serum levels of IgG and IgG4 were also increased. The patient was diagnosed with IgG4-related lung disease, treated with anti-inflammatory agents, and showed improvement. Lung involvement of IgG4-related disease can present as interstitial lung disease and, therefore, should be differentiated when evaluating interstitial lung disease.

  8. Covariance structures of fat and protein influence the estimation of IgG in bovine colostrum.

    Science.gov (United States)

    Løkke, Mette Marie; Engelbrecht, Rikke; Wiking, Lars

    2016-02-01

    On-farm instruments for assessing colostrum quality are needed in order to ensure that the calf is supplied with enough IgG to avoid failure of passive transfer. The aim of this study was to evaluate methods for estimating the IgG concentration in cows' colostrum. This research included 126 colostrum samples from 21 Danish farms with different breeds, ensuring a broad variation pattern in IgG, total protein and fat concentration. Approximately one third of the samples did not fulfil the recommendation of >50 g IgG/l colostrum, and the IgG concentration decreased with time from calving to milking. The ratio of IgG to total protein varied from 6 to 61%, however IgG and total protein were correlated with r2 = 0.70. The variation in fat was independent of variations in protein and IgG. The IgG concentration was measured by ELISA and compared to fast measurements by specific gravity by colostrometer, Brix by refractometer and prediction from infrared spectroscopy. The three fast methods were all correlated to the total protein concentration of colostrum; however specific gravity was also influenced by the fat concentration. Furthermore, specific gravity generally overestimated the IgG concentration, and the cut-off level should be raised to 1050 in order to ensure adequate IgG in colostrum. None of the methods estimated IgG concentration better than the correlation of total protein and IgG, meaning that they all depended on the indirect correlation between total protein and IgG. The results suggest that using a refractometer for quality control of colostrum is an easy and feasible method, and a cut-off level of Brix 22 seems sufficient to assure adequate IgG concentration in colostrum fed to the calf.

  9. Prueba de Elisa indirecta para la detección de anticuerpos IgM para el diagnóstico de Leptospirosis humana

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    Manuel Céspedes Z

    2002-01-01

    Full Text Available Para el diagnóstico temprano de enfermedades con cuadro clínico inespecífico como la leptospirosis, es necesario la confirmación laboratorial mediante pruebas específicas, con la finalidad de que el diagnóstico sea más acertado y rápido. Objetivo: se realizó un estudio comparativo entre la prueba de microaglutinacion (MAT y la prueba de ELISA indirecta estandarizada con un "pool" de antígenos de Leptospira interrogans, para la detección de anticuerpos IgM, en muestras de suero de fase aguda de leptospirosis humana. Materiales y métodos: 40 muestras de pacientes con sospecha clínica y con títulos de 1:100-1:12800 por la prueba de MAT, 80 muestras negativas de pacientes aparentemente sanos con enfermedades como Brucelosis, Sífilis, Tifus murino, Hepatitis B, Fiebre Amarilla, Dengue y Enfermedad de Carrión fueron evaluados por ELISA IgM. Resultados: se obtuvo una sensibilidad de 97,5% y especificidad de 98,75%, no observándose reacción cruzada con otras enfermedades. Conclusión: ELISA IgM validado en el laboratorio es suficiente sensible, específico y de fácil aplicación para el uso como prueba de tamizaje en una infección por Leptospiras con la subsecuente confirmación por MAT.

  10. Generación de anticuerpos policlonales para la detección de la variante genotípica GIII de PVY, en cultivos de tomate de árbol y papa de Colombia

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    Yuliana Gallo García

    2012-04-01

    Full Text Available Normal 0 21 false false false ES-CO X-NONE X-NONE MicrosoftInternetExplorer4 Título en ingles: Generation of policlonal antibodies for detection of the PVY genotypic variant GIII in tamarillo and potato crops from Colombia Resumen: El potyvirus PVY es uno de los agentes causales más frecuentemente asociados a problemas virales en cultivos de papa y tomate de árbol en Colombia. Dada la importancia económica de las enfermedades causadas por PVY y a la necesidad de generar material de siembra certificado por su sanidad viral, es fundamental la generación de herramientas de diagnóstico que permitan la detección temprana de este virus. En este trabajo se reporta la obtención de anticuerpos policlonales específicos, útiles para la detección del genotipo III de PVY (GIII, una de las tres variantes que recientemente han sido reportadas en cultivos de papa y tomate de árbol de la región Andina de Colombia. Como antígeno, se utilizó un péptido sintético diseñado a partir de la región variable del extremo N-terminal del gen de la cápside viral. La sensibilidad de los anticuerpos fue evaluada mediante pruebas de ELISA y dot-blot utilizando péptidos sintéticos. Se realizó una prueba piloto para validar el uso de los anticuerpos a partir de plantas sintomáticas y asintomáticas obtenidas de una región donde confluyen cultivos de ambas solanáceas, encontrándose que los anticuerpos generados ofrecen mayores niveles de detección que los anticuerpos comerciales comúnmente utilizados para detectar los serotipos PVY-O,C y PVY-N de este virus. Palabras clave: anticuerpos policlonales; ELISA; potyvirus; RT-PCR; virus Y de la papa Abstract: PVY is one of the potyvirus more frequently associated with viral infections in tomato and tamarillo crops in Colombia. Due to the economic impact of PVY and the need to certify seeds as virus-free it is important to develop diagnostic tools that allow its premature detection. In this work, the

  11. Are Classification Criteria for IgG4-RD Now Possible? The Concept of IgG4-Related Disease and Proposal of Comprehensive Diagnostic Criteria in Japan

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    Kazuichi Okazaki

    2012-01-01

    Full Text Available Recent studies suggest simultaneous or metachronous lesions in multiorgans characterized by elevated serum levels of IgG4 and abundant infiltration of IgG4-positive plasma cells with various degrees of fibrosis. Two Japanese research committees for IgG4-RD, one from fibrosclerosis (Okazaki team and the other from lymph proliferation (Umehara team supported by the “Research Program for Intractable Disease” of the Ministry of Health, Labor, and Welfare of Japan, have agreed with the unified nomenclature as “IgG4-RD” and proposed the comprehensive diagnostic criteria (CDC for IgG4-RD. Validation of the CDC demonstrated satisfactory sensitivity for the practical use of general physicians and nonspecialists but low sensitivity in the organs to be difficult in taking biopsy specimens such as type1 autoimmune pancreatitis (IgG4-related AIP, compared with IgG4-related sialadenitis/dacryoadenitis (Mikulicz's disease and IgG4-related kidney disease. Although the diagnostic criteria covering all IgG4-RD are hard to be established, combination with the CDC and organ-specific diagnostic criteria should improve sensitivity.

  12. Therapeutic IgG4 antibodies engage in Fab-arm exchange with endogenous human IgG4 in vivo

    NARCIS (Netherlands)

    A.F. Labrijn; A.O. Buijsse; E.T.J. van den Bremer; A.Y.W. Verwilligen; W.K. Bleeker; S.J. Thorpe; J. Killestein; C.H. Polman; R.C. Aalberse; J. Schuurman; J.G.J. van de Winkel; P.W.H.I. Parren

    2009-01-01

    Two humanized IgG4 antibodies, natalizumab and gemtuzumab, are approved for human use, and several others, like TGN1412, are or have been in clinical development. Although IgG4 antibodies can dynamically exchange half-molecules(1), Fab-arm exchange with therapeutic antibodies has not been demonstrat

  13. Specific IgE, IgG and IgG4 antibodies against house dust mite in patients with bronchial asthma.

    Directory of Open Access Journals (Sweden)

    Okazaki,Morihiro

    1991-08-01

    Full Text Available Serum levels of total IgE, specific IgE, IgG and IgG4 against house dust mite were measured in mite-sensitive asthma patients receiving immunotherapy with house dust. Serum levels of total IgE, mite specific IgE and IgG did not significantly change during the course of hyposensitization. Increased levels of mite specific IgG4 were observed in patients during immunotherapy. The increase in specific IgG4 was dependent on the total dose of house dust administered in both children (r = 0.636, p less than 0.001 and adults (r = 0.629, p less than 0.01. However, the increase of specific IgG4 in adults was not as apparent as in children. These results might suggest that mite specific IgG4 is a useful immunological marker in the immunotherapy for allergic asthma, and that IgG4 antibody acts as a blocking antibody in atopic bronchial asthma.

  14. UltramicroELISA indirecto para la deteccion de anticuerpos totales a citomegalovirus en suero humano Indirect Ultramicroelisa assay for the detection of human antibodies to cytomegalovirus using human serum samples

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    Jose Laferte

    1992-02-01

    Full Text Available Se normalizó un ultramicroELISA indirecto para la detección de anticuerpos a Citomegalovirus (CMV humano (UMELISA CMV. Se determinó la concentración óptima de antígeno en 30 ug/ml, la dilución de los sueros fue de 1:40 y la dilución de trabajo del conjugado fue de 1:1500. El UMELISA CMV fue comparado con las técnicas de aglutinación de latex para anticuerpos anti-CMV (Dupont de Neumors y la inmunofluorescencia indirecta (EFT. Los resultados mostraron un alto grado de concordancia y elevada copositividad y conegatividad del UMELISA con respecto a estos dos ensayos. El método es válido para el pesquisaje de anticuerpos en banco de sangre asi como para el diagnóstico de la infección mediante sueros pareados.We have standardized an indirect ultramicro ELISA assay for detecting antibodies to human Cytomegalovirus (CMV using human serum samples (UMELISA CMV. The optimal concentration of coating antigen (30 ug/ml, serum dilution (1:40 and anti-human conjugate working dilution (1:1500, were determined by a check board titration method. The UMELISA CMV was compared with the latex agglutination test for antibodies to CMV (Dupont de Nemours and with an indiret immunofluorescent method. The results have showed the high coincidence, sensitivity and especificity of the proposed assay regarding the two methods compared with, and supporting its use either for a blood donors screening or in the serological diagnosis of this infection by paired serum samples.

  15. Alta correlación en la detección de anticuerpos y antígenos de virus del dengue en muestras de suero y plasma

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    Shirly Parra-Álvarez

    2015-10-01

    Full Text Available Introducción. El diagnóstico adecuado de dengue por laboratorio es importante para la atención, así como para el control de brotes y epidemias. Hasta el momento, las pruebas ELISA para diagnóstico serológico de la infección se encuentran validadas en muestras de suero; sin embargo, en algunas ocasiones la cantidad o calidad de la muestra es inadecuada, o solo se tiene acceso a sangre anticoagulada tomada para el análisis de los parámetros hematológicos en el hemograma. Objetivo. Evaluar el desempeño de cuatro pruebas ELISA en muestras de suero y plasma de casos sospechosos de dengue. Materiales y métodos. Se procesaron 42 muestras -21 de suero y 21 de plasma- por las técnicas de ELISA de captura para IgM, ELISA de captura para IgG, ELISA indirecta para IgG y ELISA para la detección del antígeno viral NS1. Resultados. El porcentaje de muestras positivas encontrado fue IgM 33.3%, IgG Captura 33.3%, IgG Indirecta 90.5%, NS1 23.8%. El 42.9% de las muestras fueron positivas por RT-PCR (n=9. Todas las pruebas se comportaron igual tanto en sueros como plasmas (coeficiente Kappa 1.0. Conclusión. Los resultados obtenidos muestran una alta concordancia entre las mediciones realizadas en suero y en plasma, lo cual sugiere que la muestra de plasma puede utilizarse para el diagnóstico y la confirmación de los casos de dengue.

  16. Péptidos y anticuerpos útiles para la elaboración de medicamentos para el tratamiento o prevención de enfermedades humanas neurodegenerativas, medicamentos así obtenidos y sus aplicaciones

    OpenAIRE

    Trullás Oliva, Ramón; Enguita, Marta; Abad, Alba

    2007-01-01

    Péptidos y anticuerpos útiles para la elaboración de medicamentos para el tratamiento o prevención de enfermedades humanas neurodegenerativas, medicamentos así obtenidos y sus aplicaciones. La presente invención describe inhibidores de la expresión génica del gen que codifica para la proteína NP1, que actúa como un inductor de apoptosis neural y neurodegeneración, útiles para la elaboración de medicamentos o composiciones farmacéuticas para el tratamiento o prevenci...

  17. Obtención de anticuerpos policlonales IgY antiparvovirus canino y evaluación en un sistema de aglutinación con látex

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    Jannet González-Figueredo

    2015-12-01

    Full Text Available La parvovirosis canina es una de las principales infecciones que provoca gastroenteritis, fundamentalmente en cachorros, con altos índices de morbiletalidad. Los diagnosticadores más utilizados se basan en la detección de partículas virales excretadas durante la fase aguda de la enfermedad. Algunos requieren equipos especializados, lo que aumenta los costos y el tiempo de diagnóstico. Por esto, la simplificación de estos métodos con alta sensibilidad y especificidad es prioritaria. En Cuba solo se logra un diagnóstico presuntivo sin la completa confirmación de la enfermedad, principalmente por la escasez o ausencia de un medio diagnóstico en toda la red de consultorios y clínicas veterinarias, rápido, eficaz y ajustable a nuestras condiciones. Este trabajo tuvo como objetivo obtener anticuerpos policlonales IgY a partir de yema de huevo de gallina y evaluarlos mediante un sistema de látex-aglutinación, para su posible uso como terapia y principalmente en el diagnóstico. Se inmunizaron por vía intramuscular dos gallinas de raza Leghorn con una cepa atenuada de parvovirus canino (PVC tipo 2. Se aplicaron 8 inoculaciones por ave cada 15 días. Se cosecharon los huevos y se purificaron los anticuerpos por el método de sulfato de dextrana/sulfato de sodio. Se determinó el título de IgY anti-PVC por el método de Inhibición de la Hemoaglutinación (IH y con antígeno de PVC acoplado a partículas de látex de poliestireno. Por IH se obtuvo un título de IgY anti-PVC de 1:1024. Las mezclas de anticuerpos con títulos alto y medio de ambas gallinas aglutinaron con los reactivos preparados con 230 y 460 µg/mL de antígeno. La mayor intensidad de la reacción y la mejor detectabilidad correspondieron a los reactivos elaborados con los anticuerpos de mayor título.

  18. Deficit de proteina Z de la coagulación y anticuerpos anti-proteina Z como factores de riesgo de recidiva trombotica arterial y venosa. Estudio prospectivo a largo plazo

    OpenAIRE

    Pardos Gea, José

    2016-01-01

    Antecedentes: La proteína Z (PZ) es un cofactor de la coagulación que unido a su proteasa activa (ZPI) forman el ultimo sistema anticoagulante descrito. Los modelos animales confirman que el déficit de PZ es trombofílico. El número y calidad de los estudios clínicos ha sido insuficiente para constatar este hecho. Los anticuerpos anti-PZ descritos en patología obstétrica nunca se habían testado en patología trombótica vascular. Objetivos: El objetivo inicial fue investigar si el déficit de PZ ...

  19. Radioimmunoassay of IgG and IgM rheumatoid factors reacting with human IgG. [/sup 125/I tracer technique

    Energy Technology Data Exchange (ETDEWEB)

    Carson, D.A.; Lawrance, S.; Catalano, M.A.; Vaughan, J.H.; Abraham, G.

    1977-07-01

    Although IgG rheumatoid factor may play a central role in the pathogenesis of rheumatoid arthritis, previously there have been no precise methods for its specific measurement in serum and synovial fluid. This paper describes a solid phase radioimmunoassay for the independent quantification of IgM and IgG rheumatoid factor reacting with the Fc fragment of human IgG. As measured by this assay, serum IgG rheumatoid factor levels differed significantly between patients with seropositive and seronegative rheumatoid arthritis and normal control subjects. In addition, several sera and joint fluids from patients with seropositive rheumatoid arthritis, even without vasculitis, were shown by gel chromatography to have acid-dissociable complexes of IgG rheumatoid factor suggestive of IgG-IgG dimer or trimer formation.

  20. Increased IgG4 responses to multiple food and animal antigens indicate a polyclonal expansion and differentiation of pre-existing B cells in IgG4-related disease

    OpenAIRE

    Culver, EL; Vermeulen, E.; Makuch, M; Leeuwen, A. van; Sadler, R.; Cargill, T; Klenerman, P; Aalberse, RC; van Ham, SM; Barnes, E; Rispens, T

    2015-01-01

    Background: IgG4-related disease (IgG4-RD) is a systemic fibroinflammatory condition, characterised by an elevated serum IgG4 concentration and abundant IgG4-positive plasma cells in the involved organs. An important question is whether the elevated IgG4 response is causal or a reflection of immune-regulatory mechanisms of the disease. Objectives: To investigate if the IgG4 response in IgG4-RD represents a generalised polyclonal amplification by examining the response to common environmental ...

  1. IgG Conformer's Binding to Amyloidogenic Aggregates.

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    Monichan Phay

    Full Text Available Amyloid-reactive IgGs isolated from pooled blood of normal individuals (pAbs have demonstrated clinical utility for amyloid diseases by in vivo targeting and clearing amyloidogenic proteins and peptides. We now report the following three novel findings on pAb conformer's binding to amyloidogenic aggregates: 1 pAb aggregates have greater activity than monomers (HMW species > dimers > monomers, 2 pAbs interactions with amyloidogenic aggregates at least partially involves unconventional (non-CDR interactions of F(ab regions, and 3 pAb's activity can be easily modulated by trace aggregates generated during sample processing. Specifically, we show that HMW aggregates and dimeric pAbs present in commercial preparations of pAbs, intravenous immunoglobulin (IVIg, had up to ~200- and ~7-fold stronger binding to aggregates of Aβ and transthyretin (TTR than the monomeric antibody. Notably, HMW aggregates were primarily responsible for the enhanced anti-amyloid activities of Aβ- and Cibacron blue-isolated IVIg IgGs. Human pAb conformer's binding to amyloidogenic aggregates was retained in normal human sera, and mimicked by murine pAbs isolated from normal pooled plasmas. An unconventional (non-CDR component to pAb's activity was indicated from control human mAbs, generated against non-amyloid targets, binding to aggregated Aβ and TTR. Similar to pAbs, HMW and dimeric mAb conformers bound stronger than their monomeric forms to amyloidogenic aggregates. However, mAbs had lower maximum binding signals, indicating that pAbs were required to saturate a diverse collection of binding sites. Taken together, our findings strongly support further investigations on the physiological function and clinical utility of the inherent anti-amyloid activities of monomeric but not aggregated IgGs.

  2. IgG Conformer's Binding to Amyloidogenic Aggregates

    Science.gov (United States)

    Phay, Monichan; Welzel, Alfred T.; Williams, Angela D.; McWilliams-Koeppen, Helen P.; Blinder, Veronika; O'Malley, Tiernan T.; Solomon, Alan; Walsh, Dominic M.; O'Nuallain, Brian

    2015-01-01

    Amyloid-reactive IgGs isolated from pooled blood of normal individuals (pAbs) have demonstrated clinical utility for amyloid diseases by in vivo targeting and clearing amyloidogenic proteins and peptides. We now report the following three novel findings on pAb conformer's binding to amyloidogenic aggregates: 1) pAb aggregates have greater activity than monomers (HMW species > dimers > monomers), 2) pAbs interactions with amyloidogenic aggregates at least partially involves unconventional (non-CDR) interactions of F(ab) regions, and 3) pAb's activity can be easily modulated by trace aggregates generated during sample processing. Specifically, we show that HMW aggregates and dimeric pAbs present in commercial preparations of pAbs, intravenous immunoglobulin (IVIg), had up to ~200- and ~7-fold stronger binding to aggregates of Aβ and transthyretin (TTR) than the monomeric antibody. Notably, HMW aggregates were primarily responsible for the enhanced anti-amyloid activities of Aβ- and Cibacron blue-isolated IVIg IgGs. Human pAb conformer's binding to amyloidogenic aggregates was retained in normal human sera, and mimicked by murine pAbs isolated from normal pooled plasmas. An unconventional (non-CDR) component to pAb's activity was indicated from control human mAbs, generated against non-amyloid targets, binding to aggregated Aβ and TTR. Similar to pAbs, HMW and dimeric mAb conformers bound stronger than their monomeric forms to amyloidogenic aggregates. However, mAbs had lower maximum binding signals, indicating that pAbs were required to saturate a diverse collection of binding sites. Taken together, our findings strongly support further investigations on the physiological function and clinical utility of the inherent anti-amyloid activities of monomeric but not aggregated IgGs. PMID:26367058

  3. Pancreatic cancer with a high serum IgG4 concentration

    Institute of Scientific and Technical Information of China (English)

    Terumi Kamisawa; Pong Yui Chen; Yuyang Tu; Hitoshi Nakajima; Naoto Egawa; Kouji Tsuruta; Atsutake Okamoto; Tsunekazu Hishima

    2006-01-01

    Differentiation between autoimmune pancreatitis and pancreatic cancer is sometimes difficult. It has been reported that serum IgG4 concentrations are significantly elevated and particularly high (>135 mg/dL) in autoimmune pancreatitis. Measurement of serum IgG4 has become a useful tool for differentiating between autoimmune pancreatitis and pancreatic cancer. However,we present a 74-year-old female with a markedly elevated serum IgG4 (433 mg/dL) who underwentpancreaticoduodenectomy for pancreatic cancer. Elevated serum IgG4 levels continued after the resection. On histology, adenocarcinoma of the pancreas accompanied with moderate lymphoplasmacytic infiltration infiltrated the lower bile duct and duodenum, but there were no findings of autoimmune pancreatitis. Although a small metastasis was detected in one parapancreatic lymph node, regional lymph nodes were swollen. Abundant IgG4-positive plasma cells infiltrated the cancerous areas of the pancreas, but only a few IgG4-positive plasma cells were detected in the noncancerous areas.Pancreatic cancer cells were not immunoreactive for IgG4. An abundant infiltration of IgG4-positive plasma cells was detected in the swollen regional lymph nodes and in the duodenal mucosa. We believe that the serum IgG4 level was elevated in this patient with pancreatic cancer as the result of an IgG4-related systemic disease that had no clinical manifestations other than lymphadenopathy.

  4. Severe IgG4-Related Disease in a Young Child: A Diagnosis Challenge

    Directory of Open Access Journals (Sweden)

    Susana Corujeira

    2015-01-01

    Full Text Available Immunoglobulin G4-related disease (IgG4-RD is an increasingly recognized syndrome that can appear with multiple organ involvement, typically with tumor-like swelling, lymphoplasmacytic infiltrate rich in IgG4-positive plasma cells, and elevated serum IgG4 concentrations. We report the case of a 22-month-old female child with failure to thrive and recurrent respiratory tract infections since 8 months of age. Physical examination was normal except for pulmonary auscultation with bilateral crackles and wheezes. Laboratory tests revealed elevated erythrocyte sedimentation rate, and elevated serum IgG and IgG4 with polyclonal hypergammaglobulinemia. Thoracic CT and MRI showed multiple mediastinal lymphadenopathies and a nodular posterior mediastinal mass in right paratracheal location with bronchial compression. Initial fine needle aspiration biopsy was compatible with reactive lymphadenopathy but after clinical worsening a thoracoscopic partial resection of the mass was performed and tissue biopsy revealed lymphoplasmacytic infiltrate and increased number of IgG4-positive plasma cells and a ratio of IgG4/IgG positive cells above 40%. Glucocorticoids therapy was started with symptomatic improvement, reduction in the size of the mass, and decrease of serum IgG4 levels after 6 weeks. There are very few reports of IgG4-RD in children. Long-term follow-up is necessary to monitor relapses and additional organ involvement.

  5. [Review of ear and nose and throat involvement in IgG4-RD].

    Science.gov (United States)

    Tao, Xiaofeng; Liu, Chang; Song, Bo

    2015-11-01

    IgG4-related disease (IgG4-RD) is a newly recognized disease entity. IgG4-RD is characterized by a single or multiple masses in one or more organs; a lymphoplasmacytic infiltrate with a high percentage of plasma cells within the lesion staining for IgG4; a peculiar pattern of fibrosis known as "storiform" fibrosis; and elevated serum IgG4 concentrations. IgG4-RD can occur in various organs, including pancreas, kidneys, lungs, retroperitoneum, and prostate gland. The head and neck involvements of IgG4-RD have been chiefly described in Mikulicz disease (MD), Küttner's tumor, orbital? inflammatory pseudotumor, and idiopathic hypertrophic pachymeningitis (IHP) previously. Recent studies reported that IgG4-RD could also involve ear, nose and throat. Here we reviewed the literatures about ear, nose and throat involvement by IgG4-RD, in order to provide some theoretical bases for the diagnosis and treatment of IgG4-RD.

  6. IgG4 immunostaining and its implications in orbital inflammatory disease.

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    Amanda J Wong

    Full Text Available OBJECTIVE: IgG4-related disease is an emerging clinical entity which frequently involves tissue within the orbit. In order to appreciate the implications of IgG4 immunostaining, we analyzed gene expression and the prevalence of IgG4- immunostaining among subjects with orbital inflammatory diseases. METHODS: We organized an international consortium to collect orbital biopsies from 108 subjects including 22 with no known orbital disease, 42 with nonspecific orbital inflammatory disease (NSOI, 26 with thyroid eye disease (TED, 12 with sarcoidosis, and 6 with granulomatosis with polyangiitis (GPA. Lacrimal gland and orbital adipose tissue biopsies were immunostained for IgG4 or IgG secreting plasma cells. RNA transcripts were quantified by Affymetrix arrays. RESULTS: None of the healthy controls or subjects with TED had substantial IgG4 staining. Among the 63 others, the prevalence of significant IgG4-immunostaining ranged from 11 to 39% depending on the definition for significant. IgG4 staining was detectable in the majority of tissues from subjects with GPA and less commonly in tissue from subjects with sarcoidosis or NSOI. The detection of IgG4+ cells correlated with inflammation in the lacrimal gland based on histology. IgG4 staining tissue expressed an increase in transcripts associated with inflammation, especially B cell-related genes. Functional annotation analysis confirmed this. CONCLUSION: IgG4+ plasma cells are common in orbital tissue from patients with sarcoidosis, GPA, or NSOI. Even using the low threshold of 10 IgG4+ cells/high powered field, IgG4 staining correlates with increased inflammation in the lacrimal gland based on histology and gene expression.

  7. Normal pressure hydrocephalus, a possible complication in IgG4-related disease

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    Hiroshi Kobayashi

    2016-09-01

    Full Text Available We report a 75-year-old man with glucocorticoid-responsive normal pressure hydrocephalus (NPH complicated with tubulointerstitial renal disease, protein-losing gastroenteropathy (PLG and elevated serum IgG4, which might be a possible subset of IgG4-related disease (IgG4-RD. Although either PLG or NPH, especially in combination, has rarely been reported in IgG4-RD, the glucocorticoid-responsive nature of every abnormality observed in the patient supports the diagnosis of IgG4-RD. Of course, pathological confirmation is essential to fulfill the recently raised diagnostic criteria, however, such invasive procedure might not always be indicated in high-risk patients. Our report illustrates that IgG4-RD might be considered as one of the underlying causes and/or the aggravating factors of NPH before shunt operation.

  8. A New Nanogold-Labeled Immunoresonance Scattering Spectral Probe for Determination of Trace IgG

    Institute of Scientific and Technical Information of China (English)

    JIANG,Zhi-Liang; LI,Yan; SUN,Shuang-Jiao; CHEN,Bing

    2007-01-01

    A kind of 9 nm gold nanoparticles was prepared with the trisodium citrate and used to label goat anti-human IgG to obtain an IgG immunoresonance scattering spectral probe. In pH 5.8 buffer solution and in the presence of polyethylene glycol (PEG), the immune reaction between gold-labeled goat anti-human IgG and IgG took place,and the resonance scattering intensity at 580 nm (I580nm) was enhanced greatly. The enhanced intensity △IRS is proportional to the IgG concentration from 1.3 to 1.5 × 103 ng·mL 1, with a detection limit of 0.78 ng·mL-1. This assay showed high sensitivity and good selectivity for quantitative determination of IgG in human serum, with satisfactory results.

  9. Elevated serum IgG4 levels in two cases of paragonimiasis

    Science.gov (United States)

    Saeki, Sho; Horio, Yuko; Hirosako, Susumu; Ichiyasu, Hidenori; Fujii, Kazuhiko; Kohrogi, Hirotsugu

    2015-01-01

    Paragonimiasis is a parasitic pleuropulmonary infection caused by eating raw crustaceans and wild boar meat and this infection is endemic in Asia. We herein report two cases of pulmonary Paragonimus westermani infection associated with elevated levels of serum immunoglobulin (Ig) G4 and dense infiltration of IgG4-positive plasma cells in the lung lesions. Treatment with praziquantel resolved the pulmonary lesions and decreased the serum levels of IgG4. IgG4-related disease is a systemic disease occasionally involving the lungs and leads to increased serum levels of IgG4. Our findings suggest that P. westermani infection requires a differential diagnosis from IgG4-related diseases and the serum IgG4 level may be a potentially useful marker of P. westermani infection. PMID:26392854

  10. Isolated Mass-Forming IgG4-Related Cholangitis as an Initial Clinical Presentation of Systemic IgG4-Related Disease.

    Science.gov (United States)

    Kim, Seokhwi; Bae, Hyunsik; Choi, Misun; Kim, Binnari; Heo, Jin Seok; Kim, Ho Seong; Choi, Seung Hee; Jang, Kee-Taek

    2016-07-01

    IgG4-related disease (IgG4-RD) may involve multiple organs. Although it usually presents as diffuse organ involvement, localized mass-forming lesions have been occasionally encountered in pancreas. However, the same pattern has been seldom reported in biliary tract. A 61-year-old male showed a hilar bile duct mass with multiple enlarged lymph nodes in imaging studies and he underwent trisectionectomy under impression of cholangiocarcinoma. Gross examination revealed a mass-like lesion around hilar bile duct. Histopathologically, dense lymphoplasmacytic infiltration and storiform fibrosis were identified without evidence of malignancy. Immunohistochemical stain demonstrated rich IgG4-positive plasma cell infiltration. Follow-up imaging studies disclosed multiple enlarged lymph nodes with involvement of pancreas and perisplenic soft tissue. The lesions have been significantly reduced after steroid treatment, which suggests multi-organ involvement of systemic IgG4-RD. Here, we report an unusual localized mass-forming IgG4-related cholangitis as an initial presentation of IgG4-RD, which was biliary manifestation of systemic IgG4-related autoimmune disease.

  11. Increased IgG4 responses to multiple food and animal antigens indicate a polyclonal expansion and differentiation of pre-existing B cells in IgG4-related disease

    Science.gov (United States)

    Culver, Emma L; Vermeulen, Ellen; Makuch, Mateusz; van Leeuwen, Astrid; Sadler, Ross; Cargill, Tamsin; Klenerman, Paul; Aalberse, Rob C; van Ham, S Marieke; Barnes, Eleanor; Rispens, Theo

    2015-01-01

    Background IgG4-related disease (IgG4-RD) is a systemic fibroinflammatory condition, characterised by an elevated serum IgG4 concentration and abundant IgG4-positive plasma cells in the involved organs. An important question is whether the elevated IgG4 response is causal or a reflection of immune-regulatory mechanisms of the disease. Objectives To investigate if the IgG4 response in IgG4-RD represents a generalised polyclonal amplification by examining the response to common environmental antigens. Methods Serum from 24 patients with IgG4-RD (14 treatment-naive, 10 treatment-experienced), 9 patients with primary sclerosing cholangitis and an elevated serum IgG4 (PSC-high IgG4), and 18 healthy controls were tested against egg white and yolk, milk, banana, cat, peanut, rice and wheat antigens by radioimmunoassay. Results We demonstrated an elevated polyclonal IgG4 response to multiple antigens in patients with IgG4-RD and in PSC-high IgG4, compared with healthy controls. There was a strong correlation between serum IgG4 and antigen-specific responses. Responses to antigens were higher in treatment-naive compared with treatment-experienced patients with IgG4-RD. Serum electrophoresis and immunofixation demonstrated polyclonality. Conclusions This is the first study to show enhanced levels of polyclonal IgG4 to multiple antigens in IgG4-RD. This supports that elevated IgG4 levels reflect an aberrant immunological regulation of the overall IgG4 response, but does not exclude that causality of disease could be antigen-driven. PMID:25646372

  12. Fibrosing variant of Hashimoto thyroiditis is an IgG4 related disease.

    Science.gov (United States)

    Deshpande, Vikram; Huck, Amelia; Ooi, Esther; Stone, John H; Faquin, William C; Nielsen, G Petur

    2012-08-01

    Hashimoto thyroiditis (HT) and the fibrosing variant of Hashimoto thyroiditis (FVHT) are immune-mediated tumefactive lesions of the thyroid. Immunoglobulin G4-related disease (IgG4-RD) is now a widely recognised multi-organ system disease characterised by elevated serum and tissue concentrations of IgG4. In this study, the authors address several unresolved questions pertaining to the relationship between HT and FVHT, and the association of each of these diseases with IgG4-RD. The authors evaluated 28 consecutive cases of HT and nine cases of FVHT. The clinical, demographic and serological data were recorded. The slides were stained immunohistochemically using antibodies to IgG4 and IgG and the quantitative analysis was recorded. Data on thyroid function tests were available on seven cases of FVHT and 14 cases of HT. Based on the availability of data, hypothyroidism was noted in 62% (9/14) of HT and 86% of FVHT (6/7). FVHT demonstrated an exaggerated lobular pattern with lobules separated by cellular storiform-type fibrosis, resembling fibrosis seen in other forms of IgG-RD. The median IgG4 counts per high power field (×40) in HT and FVHT were 2.3 and 22, respectively. The median IgG4:IgG ratios in HT and FVHT were 0.11 and 0.58, respectively. The authors propose that FVHT belongs to the spectrum of IgG4-RD. Although a proportion of cases of HT show elevated numbers of IgG4 positive plasma cells, these cases lack the histological features typically associated with IgG4-RD, and thus the relationship between HT and IgG4-RD remains unproven.

  13. Bilateral Vision Loss Secondary to Pachymeningitis in a Patient with IgG4-Related Disease

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    Lucas eRamirez

    2014-10-01

    Full Text Available IgG4-Related Disease is a recently recognized fibroinflammatory condition associated with disease in nearly every organ, including the meninges. A proportion of Idiopathic Hypertrophic Pachymeningitis cases may involve a component of meningeal IgG4-RD. We present a patient with severe bilateral vision loss found to have thickening of the dura mater on MRI, and subsequently diagnosed with IgG4-RD after dural biopsy.

  14. Mitochondrial-dependent Autoimmunity in Membranous Nephropathy of IgG4-related Disease

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    Simona Buelli

    2015-05-01

    Full Text Available The pathophysiology of glomerular lesions of membranous nephropathy (MN, including seldom-reported IgG4-related disease, is still elusive. Unlike in idiopathic MN where IgG4 prevails, in this patient IgG3 was predominant in glomerular deposits in the absence of circulating anti-phospholipase A2 receptor antibodies, suggesting a distinct pathologic process. Here we documented that IgG4 retrieved from the serum of our propositus reacted against carbonic anhydrase II (CAII at the podocyte surface. In patient's biopsy, glomerular CAII staining increased and co-localized with subepithelial IgG4 deposits along the capillary walls. Patient's IgG4 caused a drop in cell pH followed by mitochondrial dysfunction, excessive ROS production and cytoskeletal reorganization in cultured podocytes. These events promoted mitochondrial superoxide-dismutase-2 (SOD2 externalization on the plasma membrane, becoming recognizable by complement-binding IgG3 anti-SOD2. Among patients with IgG4-related disease only sera of those with IgG4 anti-CAII antibodies caused low intracellular pH and mitochondrial alterations underlying SOD2 externalization. Circulating IgG4 anti-CAII can cause podocyte injury through processes of intracellular acidification, mitochondrial oxidative stress and neoantigen induction in patients with IgG4 related disease. The onset of MN in a subset of patients could be due to IgG4 antibodies recognizing CAII with consequent exposure of mitochondrial neoantigen in the context of multifactorial pathogenesis of disease.

  15. An IgG4-related sclerosing mediastinitis in posterior mediastinum: CT findings

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    Xiaolong Liu

    2015-03-01

    Full Text Available Immunoglobulin G4 (IgG4-related sclerosing disease, an uncommon disease entity, is known to involve various organs. To our knowledge, few reports have been presented on IgG4-related sclerosing diseases involving the mediastinum, especially the posterior mediastinum. We present a case of IgG4-related sclerosing disease of the posterior mediastinum with imaging findings on computed tomography (CT.

  16. Refractory gastric ulcer with abundant IgG4-positive plasma cell infiltration: A case report

    Institute of Scientific and Technical Information of China (English)

    Takayoshi; Fujita; Takafumi; Ando; Masatoshi; Sakakibara; Waki; Hosoda; Hidemi; Goto

    2010-01-01

    We describe a 77-year-old man with refractory gastric ulcer that worsened after Helicobacter pylori eradication therapy.Pathology showed marked infiltration of IgG4-positive plasma cells in the gastric lesions,which led us to suspect IgG4-related sclerosing disease.To the best of our knowledge,this is the first report of IgG4-related gastric ulcer without the main manifestation of autoimmune pancreatitis.

  17. Effect of the mass of immunoglobulin (Ig)G intake and age at first colostrum feeding on serum IgG concentration in Holstein calves.

    Science.gov (United States)

    Osaka, I; Matsui, Y; Terada, F

    2014-10-01

    Forty-four Holstein calves (19 male and 25 female) were used in this study of the relationships among age at first colostrum feeding, IgG intake, and apparent efficiency of IgG absorption. Time of birth was recorded for each calf and the calves were fed colostrum ad libitum after birth at either 0930 or 1630 h. Blood samples were collected immediately before and 24h after colostrum feeding. Data from calves were then categorized into 4 groups representing time from birth to colostrum feeding: A=fed within 1h (n=5); B=fed from 1 to 6h (n=10); C=fed from 6 to 12 h (n=21); and D=fed from 12 to 18 h (n=8) after birth. Average total intake of colostrum was 3.6 ± 0.1L. Over 80% of the calves consumed ≥3 L of colostrum. Apparent efficiency of IgG absorption declined remarkably 12 h after birth. Mean apparent efficiency of absorption of IgG in group D (15.8 ± 3.0%) was lower than that in groups A (30.5 ± 3.9%) and B (27.4 ± 2.8%). Serum IgG concentration in calves was positively correlated with IgG intake in all groups. The relationship between mass of IgG consumed and calf serum IgG at 24 h was different for each time of colostrum feeding, with only limited differences observed between groups A and B. We concluded that failure of transfer of passive immunity in newborn calves may be avoided if calves consume ≥3 L of colostrum with IgG concentration >40 mg/mL within 6 h after birth. These findings help define the opportunity to minimize failure of transfer of passive immunity to newborn calves under management programs similar to those used on commercial dairy farms.

  18. Familias isoflavona reductasa y Ole e 1-like: relevancia de alérgenos minoritarios en especies vegetales de climas mediterráneos

    OpenAIRE

    Castro de las Cuevas, Lourdes

    2016-01-01

    La hipersensibilidad de tipo I, conocida como alergia atópica, es una respuesta inmunológica alterada y mediada por anticuerpos IgE (inmunoglobulina E), dirigida frente a determinados antígenos denominados alérgenos, la gran mayoría de los cuales son moléculas inocuas para el ser humano en condiciones normales. Esta hiperreactividad o reacción excesiva del sistema inmune resulta perjudicial para el organismo y su incidencia ha aumentado de forma notable en los últimos años, estimándose que af...

  19. Purification of rabbit IgG, obtention of sheep anti rabbit IgG and their use in radioimmunoassay of avian leukosis virus p15

    Energy Technology Data Exchange (ETDEWEB)

    Higuchi, Tomoko; Ogata, Hiroe; Veiga, Silvio Sanches; Nogueira, Zelia Maria [Instituto de Quimica, Sao Paulo, SP (Brazil); Souza Felippe, Julia Maria Martins de [Instituto Adolfo Lutz, Sao Paulo, SP (Brazil). Div. de Virus

    1988-01-01

    Immunoglobulin from rabbit serum was purified by ammonium sulphate precipitation followed by chromatography on DEA-cellulose and gel filtration in Sephadex G-200. The efficiency of all steps was followed by protein determination and profiles in sodium dodecyl-sulphate polyacrylamide gel electrophoresis. Sheeps were immunized with purified IgG. The deep anti-rabbit IgG titre was evaluated by double immuno diffusion gel plates. The system rabbit serum vs sheep anti-rabbit IgG serum was used as precipitating system in radioimmunoassay of the retrovirus immunogens, in this case, p15 of avian leukosis virus. (author). 19 refs., 4 figs., 3 tabs.

  20. A case of progressively transformed germinal center-type IgG4-related lymphadenopathy.

    Science.gov (United States)

    Seki, Nobuhiko; Yamazaki, Norikazu; Koizumi, Jun-ichi; Takano, Ken-ichi; Abe, Ayumi; Ikeda, Tatsuru; Noguchi, Hiroko; Himi, Tetsuo

    2015-08-01

    Progressively transformed germinal centers (PTGC), a lymph node process unfamiliar to most otolaryngologists, is a morphological variant of reactive lymphofollicular hyperplasia of lymph nodes. Immunoglobulin (Ig)G4-related disease (IgG4-RD) is a newly identified condition, characterized by hyper-IgG4-γ-globulinemia and mass-forming or hypertrophic lesions associated with infiltration of IgG4(+) plasma cells in the affected organs. Recently, a case study of PTGC was reported that fulfilled the diagnostic criteria of IgG4-RD (IgG4(+) PTGC) [1]. A 68-year-old male was referred to our hospital with swelling in the left submandibular region. Palpation revealed swollen lymph nodes, the largest of which measured 5cm in diameter. (18)F-fluorodeoxyglucose (FDG)-positron emission tomography/computed tomography identified lymphadenopathy with high (18)F-FDG uptake in the left submandibular region. We strongly suspected malignant lymphoma, and excisional biopsy of the submandibular lymph node was performed under general anesthesia. Pathological findings were consistent with IgG4(+) PTGC, and serological examination demonstrated elevated levels of IgG4. These findings were consistent with IgG4-RD. The patient did not have systemic lesions; therefore, he has not undergone corticosteroid therapy. IgG4(+) PTGC should be considered as a differential diagnosis for cervical lymphadenopathy by otolaryngologists as well as pathologists.

  1. Prevalence of IgG4-Related Disease in Japan Based on Nationwide Survey in 2009

    Directory of Open Access Journals (Sweden)

    Kazushige Uchida

    2012-01-01

    Full Text Available The number of patients with autoimmune pancreatitis who visited hospitals in Japan in 2007 was approximately 2709 (95% confidence interval; range 2540–3040. Because IgG4-related disease is a new clinical entity, there are no data with regard to its prevalence. To estimate the number of patients with IgG4-related disease in Japan, we randomly selected hospitals using stratification and asked them how many patients they had with IgG4-related disease in 2009. The number of patients with Mikulicz’s disease, IgG4-related retroperitoneal fibrosis, IgG4-related renal disease, IgG4-related pulmonary disease, and IgG4-related lymphadenopathy who visited hospitals in Japan in 2009 was approximately 4304 (95% confidence interval; range 3360–5048, 272 (95% confidence interval; range 264–306, 57 (95% confidence interval; range 47–66, 354 (95% confidence interval; range 283–424, and 203 (95% confidence interval; range 187–240, respectively. The total number of patients with IgG4-related disease without autoimmune pancreatitis in Japan was approximately 5190 (95% confidence interval; range 4141–6084. The male : female ratio was 1 : 0.77, and the average of age of disease onset was 58.8 years. The total number of patients with IgG4-related disease in Japan in 2009, including autoimmune pancreatitis, was approximately 8000.

  2. Histologically confirmed isolated IgG4-related hypophysitis: two case reports in young women

    OpenAIRE

    Sosa, Gabriela Alejandra; Bell, Soledad; Christiansen, Silvia Beatriz; Pietrani, Marcelo; Glerean, Mariela; Loto, Monica; Lovazzano,Soledad; Carrizo, Antonio; Ajler, Pablo; Fainstein Day, Patricia

    2014-01-01

    Summary IgG4-related hypophysitis is a recently described entity belonging to the group of IgG4-related diseases. Many other organs can also be affected, and it is more common in older men. To date, 32 cases of IgG4-related hypophysitis have been reported in the literature, 11 of which included confirmatory tissue biopsy and the majority affecting multiple organs. The aim of this report is to present two cases of biopsy-proven IgG4-related hypophysitis occurring in two young female patients w...

  3. Granuloma faciale: a cutaneous lesion sharing features with IgG4-associated sclerosing diseases.

    Science.gov (United States)

    Cesinaro, Anna Maria; Lonardi, Silvia; Facchetti, Fabio

    2013-01-01

    The pathogenesis of granuloma faciale (GF), framed in the group of cutaneous vasculopathic dermatitis, is poorly understood. The present study investigated whether GF might be part of the spectrum of IgG4-related sclerosing diseases (IgG4-RD). Erythema elevatum diutinum (EED), believed to belong to the same group of disorders as GF, was also studied for comparison. Thirty-one biopsies of GF obtained from 25 patients (18 men, 7 women) and 5 cases of EED (4 women and 1 man) were analyzed morphologically and for the expression of IgG and IgG4 by immunohistochemistry. The distribution of Th1, T regulatory and Th2 T-cell subsets, respectively, identified by anti-T-bet, anti-FoxP3, and anti-GATA-3 antibodies, was also evaluated. The dermal inflammatory infiltrate in GF contained eosinophils and plasma cells in variable proportions. Obliterative venulitis was found in 16 cases, and storiform fibrosis, a typical feature of IgG4-RD, was observed in 8 cases and was prominent in 3 of them. On immunohistochemical analysis 7 of 31 biopsies (22.6%) from 6 GF patients fulfilled the criteria for IgG4-RD (IgG4/IgG ratio >40%, and absolute number of IgG4 per high-power field >50). Interestingly, the 6 patients were male, and 4 showed recurrent and/or multiple lesions. In an additional 5 cases, only the IgG4/IgG ratio was abnormal. None of the 5 EED cases fulfilled the criteria for IgG4-RD. The T-cell subsets in GF were quite variable in number, GATA-3 lymphocytes were generally more abundant, but no relationship with the number of IgG4 plasma cells was found. The study indicates that a significant number of GF cases are associated with an abnormal content of IgG4 plasma cells; this association was particularly obvious in male patients and in cases presenting with multiple or recurrent lesions. As morphologic changes typically found in IgG4-RD, such as obliterative vascular inflammation and storiform sclerosis, are found in GF, we suggest that GF might represent a localized form of

  4. [Two cases of IgG4-related disease with pleural effusion].

    Science.gov (United States)

    Suzuki, Nobuaki; Saeki, Takako; Shimaoka, Yuichi; Kuriyama, Hideyuki; Nishibori, Takeaki; Ebe, Yusuke; Sato, Kazuhiro

    2011-02-01

    We describe 2 cases of IgG4-related disease with pleural effusion in elderly men. Both patients had elevated serum IgG4 levels, and the characteristics of their pleural effusion were similar. Patient 1 had pericardial effusion and retroperitoneal fibrosis, and a biopsy specimen from the pericardium showed infiltration of abundant IgG4-positive plasma cells with fibrosis. Because his pleurisy, pericarditis and retroperitoneal fibrosis responded to steroid therapy, we diagnosed pleurisy associated with IgG4-related disease. Patient 2 had been treated with steroids because of IgG4-related sialadenitis and interstitial pneumonitis, but pleural effusion developed. Although histopathological examination of the pleura showed infiltration of abundant IgG4-positive plasma cells with fibrosis, Mycobacterium tuberculosis was cultured from the pleural effusion, and histologic examination also showed epithelioid granuloma. Chemotherapy for tuberculosis was effective for the pleurisy, and we diagnosed tuberculous pleurisy as a complication of IgG4-related disease. In cases of IgG4-related disease associated with pleural effusion, the clinical course should be considered together with the serum IgG4 levels and pleural histology.

  5. Detection of PMTV Using Polyclonal Antibodies Raised Against a Capsid-Specific Peptide Antigen / Detección de PMTV Utilizando Anticuerpos Policlonales Contra un Péptido Antigénico Derivado de la Cápside Viral

    Directory of Open Access Journals (Sweden)

    Yuliana Gallo García

    2013-12-01

    Full Text Available Potato mop-top virus (PMTV; genus Pomovirus;family Virgaviridae is the causing agent of the spraing disease in potato (Solanum tuberosum. PMTV is transmitted by Spongospora subterranea f. sp. subterranea (Sss. This disease has a widespread distribution in potato growing regions around the world. The possibility of obtaining strain specific antibodies at low cost can greatly increase the sensitivity and use of serological tests in seed certification programs, plant breeding and quarantine regulations to avoid dissemination of this injurious virus. This work presents an alternative procedure for the production of PMTV specific antibodies useful in serological test such as ELISAand lateral flow. In contrast to standard methods requiring theisolation of viral particles or expression of recombinant capsid, this method uses peptides mimicking the N-terminal region of PMTV capsid protein as antigen for the production of specific polyclonal antibodies. The antibodies were tested against bait plants grown in soil infested with viruliferous Sss, as well as potato plants obtained from naturally Sss infested fields in Colombia. PMTV was detected in 9/14 and 24/28 foliage samples of N. benthamiana and S. phureja, respectively. In the case of field plants, the virus wasdetected in eight out of 12 root tissues evaluated. The minimumpeptide concentration detected by ELISA was of the order of 0.1 nM. / Potato mop-top virus (PMTV; género Pomovirus; familia Virgaviridae es transmitido por Spongospora subterranea f. sp. subterranea (Sss, agente causal de la sarna polvosa de la papa. Esta enfermedad tiene una amplia distribución en las regiones cultivadoras de papa alrededor del mundo. La posibilidad de obtener anticuerpos específicos contra cepas de este virus, puede incrementar la sensibilidad y la utilización de pruebas serológicas en programas de certificación de semilla, mejoramiento genético y regulaciones cuarentenarias que eviten su diseminaci

  6. Use of IgG avidity ELISA to differentiate acute from persistent infection with Salmonella Dublin in cattle

    DEFF Research Database (Denmark)

    Hansen, K.R.; Nielsen, L.R.; Lind, Peter

    2006-01-01

    Aims: To investigate whether an immunoglobulin (Ig)G avidity ELISA can be used to differentiate between acute and persistent infection with Salmonella (S.) Dublin in cattle. To determine whether the IgG isotype, IgG(1) and IgG(2) responses in acute and persistent infections differ. Methods...... and Results: Animals were selected from two herds with long-term infection (years) and two herds recently infected (...) was calculated for IgG (IgG-AI), IgG(1) (IgG(1)-AI) and IgG(2) (IgG(2)-AI). The mean IgG-AI for suspected carrier animals with either persistently high (group 1) or persistently high to medium high (group 2) antibody levels was significantly (P = 0.003) higher (32.1% and 38.4%) than for acutely infected animals...

  7. IgG4-Associated Cholangitis--A Mimic of PSC.

    Science.gov (United States)

    Beuers, Ulrich; Hubers, Lowiek M; Doorenspleet, Marieke; Maillette de Buy Wenniger, Lucas; Klarenbeek, Paul L; Boonstra, Kirsten; Ponsioen, Cyriel; Rauws, Erik; de Vries, Niek

    2015-01-01

    IgG4-associated cholangitis (IAC) is an inflammatory disorder of the biliary tract representing a major manifestation of IgG4-related disease (IgG4-RD) often with elevation of serum IgG4 levels, infiltration of IgG4+ plasma cells in the affected tissue and good response to immunosuppressive treatment. Its first description may go back to 150 years ago. The clinical presentation of IAC is often misleading, mimicking other biliary diseases such as primary sclerosing cholangitis (PSC) or cholangiocarcinoma. The HISORt criteria--histopathological, imaging, and serological features (sIgG4), other organ manifestations of IgG4-RD and response to treatment--are the standard for the diagnosis of IAC. In this overview of a recent lecture, we summarize our original findings on IgG4-RD that (i) dominant IgG4+ B-cell clones identified by advanced next generation sequencing (NGS) are highly specific for IgG4-RD (meanwhile confirmed by others), are a highly accurate diagnostic marker to distinguish IgG4-RD from PSC and biliary/pancreatic malignancies and may be crucial in unravelling the pathophysiology of IgG4-RD; (ii) sIgG4/sIgG1 >0.24 have additional diagnostic value in comparison to sIgG4 in differentiating IAC from PSC; (iii) blood IgG4 mRNA is a highly accurate diagnostic marker comparable to NGS and may become an easily available and affordable diagnostic standard for distinguishing IgG4-RD from PSC and biliary/pancreatic malignancies; and (iv) 'blue collar work' with long-term exposure to solvents, paints, oil products or industrial gases may be a risk factor for development of IgG4-RD. These findings may contribute to the understanding of the pathophysiology and to the early diagnosis and adequate treatment of IgG4-RD.

  8. [IgM, IgG and IgG subclass antibodies to herpes simplex virus in persons of different ages].

    Science.gov (United States)

    Zazimko, L A; Kuzenkova, A V; Ivanova, I A; Bashukova, S S; Rybakov, V P; Klimovich, V B; Shitikova, G S

    2000-01-01

    IgM, IgG antibodies to herpes simplex virus and their subclases were investigated in 565 subjects of different age tested at virological laboratories of St. Petersburg in 1996-1997. The majority of these subjects had a history of herpes infection and 21.5% had IgM antibodies to herpes simplex virus (HSV), marker of acute herpetic infection. Besides IgM, IgG1 antibodies can be referred to early antibodies appearing during the acute stage of herpetic infection. The predominant subclass was HSV IgG3 antibodies. As for IgG4, they were completely absent in infants aged under 1 year, were detected in 6.2% children aged under 14 years, and were present in 12.2-12.5% adults.

  9. Comparison of IgM, IgG1 and IgG2 responses to Trichinella spiralis and Trichinella britovi in swine

    Directory of Open Access Journals (Sweden)

    Serrano F.J

    2001-06-01

    Full Text Available Pigs infected with T. spiralis and T. britovi were followed by double (lgG and triple antibody ELISA (IgG1, lgG 2 and IgM during a 12-week-period. Specific IgG and IgG1 responses were similar and showed a significant relation with the infecting doses and intensity of infection. Response to T. britovi was slightly lower than in groups infected with the same dose of T. spiralis. lgG 2 response was weak and almost undetectable in the lowest infected pigs, but relationship with the intensity of infection was unclear. IgM antibodies showed rapid but transient increases, generally simultaneous to peaks of IgG response.

  10. Pemphigus vulgaris is characterized by low IgG reactivities to specific self-antigens along with high IgG reactivity to desmoglein 3.

    Science.gov (United States)

    Fattal, Ittai; Rimer, Jacob; Shental, Noam; Molad, Yair; Gabrielli, Armando; Livneh, Avi; Sarig, Ofer; Goldberg, Ilan; Gafter, Uzi; Domany, Eytan; Cohen, Irun R

    2014-11-01

    Pemphigus vulgaris (PV) is an autoimmune skin disease, which has been characterized by IgG autoantibodies to desmoglein 3. Here we studied the antibody signatures of PV patients compared with healthy subjects and with patients with two other autoimmune diseases with skin manifestations (systemic lupus erythematosus and scleroderma), using an antigen microarray and informatics analysis. We now report a previously unobserved phenomenon--patients with PV, compared with the healthy subjects and the two other diseases, show a significant decrease in IgG autoantibodies to a specific set of self-antigens. This novel finding demonstrates that an autoimmune disease may be associated with a loss of specific, healthy IgG autoantibodies and not only with a gain of specific, pathogenic IgG autoantibodies.

  11. Histopathologic Overlap between Fibrosing Mediastinitis and IgG4-Related Disease

    Directory of Open Access Journals (Sweden)

    Tobias Peikert

    2012-01-01

    Full Text Available Fibrosing mediastinitis (FM and IgG4-related disease (IgG4-RD are two fibroinflammatory disorders with potentially overlapping clinical and radiological features. In this paper, we looked for histopathologic features of IgG4-RD and enumerated infiltrating IgG4-positive plasma cells within mediastinal tissue biopsies from FM patients. We identified 15 consecutive FM surgical mediastinal tissue biopsies between 1985 and 2006. All patients satisfied the clinical and radiological diagnostic criteria for FM. All patients had either serological or radiological evidence of prior histoplasmosis or granulomatous disease, respectively. Formalin-fixed paraffin-embedded tissue sections of all patients were stained for H&E, IgG, and IgG4. Three samples met the predefined diagnostic criteria for IgG4-RD. In addition, characteristic histopathologic changes of IgG4-RD in the absence of diagnostic numbers of tissue infiltrating IgG4-positive plasma cells were seen in a number of additional cases (storiform cell-rich fibrosis in 11 cases, lymphoplasmacytic infiltrate in 7 cases, and obliterative phlebitis/arteritis in 2 cases. We conclude that up to one-third of histoplasmosis or granulomatous-disease-associated FM cases demonstrate histopathological features of IgG4-RD spectrum. Whether these changes occur as the host immune response against Histoplasma or represent a manifestation of IgG4-RD remains to be determined. Studies to prospectively identify these cases and evaluate their therapeutic responses to glucocorticoids and/or other immunosuppressive agents such as rituximab are warranted.

  12. A Monosaccharide Residue Is Sufficient to Maintain Mouse and Human IgG Subclass Activity and Directs IgG Effector Functions to Cellular Fc Receptors

    Directory of Open Access Journals (Sweden)

    Daniela Kao

    2015-12-01

    Full Text Available Immunoglobulin G (IgG glycosylation modulates antibody activity and represents a major source of heterogeneity within antibody preparations. Depending on their glycosylation pattern, individual IgG glycovariants present in recombinant antibody preparations may trigger effects ranging from enhanced pro-inflammatory activity to increased anti-inflammatory activity. In contrast, reduction of IgG glycosylation beyond the central mannose core is generally believed to result in impaired IgG activity. However, this study reveals that a mono- or disaccharide structure consisting of one N-acetylglucosamine with or without a branching fucose residue is sufficient to retain the activity of the most active human and mouse IgG subclasses in vivo and further directs antibody activity to cellular Fcγ receptors. Notably, the activity of minimally glycosylated antibodies is not predicted by in vitro assays based on a monomeric antibody-Fcγ-receptor interaction analysis, whereas in vitro assay systems using immune complexes are more suitable to predict IgG activity in vivo.

  13. IgG4-Related Autoimmune Prostatitis: Is It an Unusual or Underdiagnosed Manifestation of IgG4-Related Disease?

    Directory of Open Access Journals (Sweden)

    María T. Bourlon

    2013-01-01

    Full Text Available IgG4-related disease (IgG4-RD encompasses a wide range of extrapancreatic manifestations. Albeit some are relatively well known, others such as autoimmune prostatitis remain poorly described. We present a 61-year-old Latin-American male with autoimmune pancreatitis (AIP who presented with lower urinary tract symptoms (LUTS, normal prostate specific antigen (PSA test, and prostate enlargement attributed to benign prostatic hyperplasia (BPH. He underwent a transurethral resection of the prostate (TURP after which symptoms were resolved. On histopathology, prostatic stroma had a dense inflammatory infiltrate rich in plasma cells and lymphocytes; immunohistochemical morphometric assessment showed >10 IgG4-positive plasma cells/high power field (HPF. The diagnosis of IgG4-related prostatitis was postoperatively. We compared the patient characteristics with those of previous reports on Asian patients. Shared findings included prostate enlargement, LUTS (symptoms that can be confused with BPH, and PSA within normal limits or mild elevations. IgG4-related prostatitis is rarely considered as a preprocedural diagnosis, even in patients with evidence of IgG4-RD. Involved prostate zones include mainly central and transitional zones and less frequently the peripheral. Currently, there is insufficient data about the natural history and outcome. Whether steroids, transurethral resection, or both are the treatment of choice needs to be elucidated.

  14. Polimorfismo Alélico do receptor FcyRIIA na Leishmaniose Tegumentar Americana

    OpenAIRE

    2007-01-01

    O FcyRIIA, receptor para região Fc de IgG, expresso por macrófagos, neutrófilos, plaquetas e células dendríticas, liga-se às subclasses de anticorpos IgG com afinidade variável, que pode ser influenciada pelo polimorfismo alélico no gene que codifica este receptor. A troca do aminoácido arginina (R) para histidina (H) na posição 131 determina três padrões alélicos: os homozigotos H/H e R/R e o heterozigoto H/R, conferindo ao FcγRIIA H/H131 maior afinidade para as subclasses IgG2 e IgG3...

  15. Maternofetal transplacental transport of recombinant IgG antibodies lacking effector functions

    DEFF Research Database (Denmark)

    Mathiesen, Line; Nielsen, Leif K; Andersen, Jan Terje;

    2013-01-01

    The neonatal Fc receptor (FcRn) directs the transfer of maternal immunoglobulin G (IgG) antibodies across the placenta and thus provides the fetus and newborn with passive protective humoral immunity. Pathogenic maternal IgG antibodies will also be delivered via the placenta and can cause alloimm...

  16. Enhanced HIV-1 neutralization by a CD4-VH3-IgG1 fusion protein

    Energy Technology Data Exchange (ETDEWEB)

    Meyuhas, Ronit; Noy, Hava; Fishman, Sigal [Laboratory of Immunology, MIGAL, P.O. Box 831, Kiryat Shmona 11016 (Israel); Margalit, Alon [Laboratory of Immunology, MIGAL, P.O. Box 831, Kiryat Shmona 11016 (Israel); Department of Biotechnology, Tel-Hai Academic College, Upper Galilee 12210 (Israel); Montefiori, David C. [Department of Surgery, Duke University Medical Center, Durham, NC 27710 (United States); Gross, Gideon, E-mail: gidi@migal.org.il [Laboratory of Immunology, MIGAL, P.O. Box 831, Kiryat Shmona 11016 (Israel); Department of Biotechnology, Tel-Hai Academic College, Upper Galilee 12210 (Israel)

    2009-08-21

    HIV-1 gp120 is an alleged B cell superantigen, binding certain VH3+ human antibodies. We reasoned that a CD4-VH3 fusion protein could possess higher affinity for gp120 and improved HIV-1 inhibitory capacity. To test this we produced several human IgG1 immunoligands harboring VH3. Unlike VH3-IgG1 or VH3-CD4-IgG1, CD4-VH3-IgG1 bound gp120 considerably stronger than CD4-IgG1. CD4-VH3-IgG1 exhibited {approx}1.5-2.5-fold increase in neutralization of two T-cell laboratory-adapted strains when compared to CD4-IgG1. CD4-VH3-IgG1 improved neutralization of 7/10 clade B primary isolates or pseudoviruses, exceeding 20-fold for JR-FL and 13-fold for Ba-L. It enhanced neutralization of 4/8 clade C viruses, and had negligible effect on 1/4 clade A pseudoviruses. We attribute this improvement to possible pairing of VH3 with CD4 D1 and stabilization of an Ig Fv-like structure, rather than to superantigen interactions. These novel findings support the current notion that CD4 fusion proteins can act as better HIV-1 entry inhibitors with potential clinical implications.

  17. ROLE OF ENVIRONMENTAL ANTIGEN IN THE DEVELOPMENT OF IGG(+) CELLS IN THE BURSA OF FABRICIUS

    NARCIS (Netherlands)

    EKINO, S; RIWAR, B; KROESE, FGM; SCHWANDER, EH; NIEUWENHUIS, P

    1995-01-01

    IgG(+) cells were detected in the bursa of Fabricius after hatching by immunofluorescence staining of single cells and immunohistologic studies using mAb anti-Ig gamma-heavy chain. The frequency of IgG(+) cells in the bursa increased rapidly immediately after hatching. In histologic studies, most of

  18. Sialylation of IgG Fc domain impairs complement-dependent cytotoxicity.

    Science.gov (United States)

    Quast, Isaak; Keller, Christian W; Maurer, Michael A; Giddens, John P; Tackenberg, Björn; Wang, Lai-Xi; Münz, Christian; Nimmerjahn, Falk; Dalakas, Marinos C; Lünemann, Jan D

    2015-11-01

    IgG molecules exert both pro- and antiinflammatory effector functions based on the composition of the fragment crystallizable (Fc) domain glycan. Sialylated IgG Fc domains have antiinflammatory properties that are attributed to their ability to increase the activation threshold of innate effector cells to immune complexes by stimulating the upregulation of the inhibitory Fcγ receptor IIB (FcγRIIB). Here, we report that IgG Fc sialylation of human monoclonal IgG1 molecules impairs their efficacy to induce complement-mediated cytotoxicity (CDC). Fc sialylation of a CD20-targeting antibody had no impact on antibody-dependent cellular cytotoxicity and did not change the affinity of the antibody for activating Fcγ receptors. In contrast, the presence of sialic acid abrogated the increased binding of C1q to Fc-galactosylated IgG1 and resulted in decreased levels of C3b deposition on the cell surface. Similar to monoclonal antibodies, sialic acid inhibited the increased C1q binding to galactosylated Fc fragments in human polyclonal IgG. In sera derived from patients with chronic inflammatory demyelinating polyneuropathy, an autoimmune disease of the peripheral nervous system in which humoral immune responses mediate tissue damage, induction of IgG Fc sialylation was associated with clinical disease remission. Thus, impairment of CDC represents an FcγR-independent mechanism by which Fc-sialylated glycovariants might limit proinflammatory IgG effector functions.

  19. Antibody isotypes, including IgG subclasses, in Ecuadorian patients with pulmonary Paragonimiasis

    Directory of Open Access Journals (Sweden)

    Angel Guevara E.

    1995-08-01

    Full Text Available An ELISA test was developed to detect Paragonimus-specific antibodies, including IgG subclasses, using P. mexicanus crude water-soluble antigens. The test was standardized to detect antibodies in sera of Ecuadorian patients with pulmonary paragonimiasis and negative controls from the endemic area. The detected mean levels of IgG (0.753, SEM: 0.074 and IgM (0.303, SEM: 0.033 were significantly elevated (P<0.05. Within the IgG subclasses, IgG4 showed the highest detected mean level (0.365, SEM: 0.116 and the other three subclasses showed considerably lower mean levels (IgG1, 0.186 SEM: 0.06; IgG2, 0.046 SEM: 0.01; IgG3, 0.123 SEM: 0.047. The number of P. mexicanus eggs found in sputum of infected individuals showed a positive correlation with the level of antibodies detected for IgM, IgG and its subclasses (P<0.001. The relevance of these findings in Ecuadorian patients suffering from pulmonary paragonimiasis is discussed.

  20. Bovine IgG subclasses and fertility of Echinococcus granulosus hydatid cysts.

    Science.gov (United States)

    Riesle, Silke; García, María Pía; Hidalgo, Christian; Galanti, Norbel; Saenz, Leonardo; Paredes, Rodolfo

    2014-09-15

    Hydatidosis is an important zoonotic disease of worldwide distribution, causing important health problems to humans and major economical losses in infected livestock. Echinococcus granulosus, the etiological agent of hydatid disease, induces a humoral immune response in the intermediate host (human and herbivorous) against hydatid cyst antigens. Specifically, IgGs are found in the laminar and germinal layers and inside the lumen of fertile and infertile hydatid cysts. In the germinal layer of infertile cysts IgGs are found in an order of magnitude greater than in the germinal layer of fertile cysts; a fraction of those IgGs are associated with high affinity to germinal layer proteins, suggesting their binding to specific parasite antigens. We have previously shown that those immunoglobulins, bound with high affinity to the germinal layer of hydatid cysts, induce apoptosis leading to cyst infertility. In the present work the presence of IgG1 and IgG2 subclasses in the germinal layer of both fertile and infertile hydatid cysts is reported. IgG1 is the most relevant immunoglobulin subclass present in the germinal layer of infertile cysts and bound with high affinity to that parasite structure. Contrarily, though the IgG2 subclass was also found in the germinal and adventitial layers, those immunoglobulins show low affinity to parasite antigens. We propose that the binding of an IgG1 subclass to parasite antigens present in the germinal layer is involved in the mechanism of cyst infertility.

  1. Design and Evaluation of the Highly Concentrated Human IgG Formulation Using Cyclodextrin Polypseudorotaxane Hydrogels.

    Science.gov (United States)

    Higashi, Taishi; Tajima, Anna; Ohshita, Naoko; Hirotsu, Tatsunori; Abu Hashim, Irhan Ibrahim; Motoyama, Keiichi; Koyama, Sawako; Iibuchi, Ruriko; Mieda, Shiuhei; Handa, Kenji; Kimoto, Tomoaki; Arima, Hidetoshi

    2015-12-01

    To achieve the potent therapeutic effects of human immunoglobulin G (IgG), highly concentrated formulations are required. However, the stabilization for highly concentrated human IgG is laborious work. In the present study, to investigate the potentials of polypseudorotaxane (PPRX) hydrogels consisting of polyethylene glycol (PEG) and α- or γ-cyclodextrin (α- or γ-CyD) as pharmaceutical materials for highly concentrated human IgG, we designed the PPRX hydrogels including human IgG and evaluated their pharmaceutical properties. The α- and γ-CyDs formed PPRX hydrogels with PEG (M.W. 20,000) even in the presence of highly concentrated human IgG (>100 mg/mL). According to the results of (1)H-NMR, powder X-ray diffraction, and Raman microscopy, the formation of human IgG/CyD PPRX hydrogels was based on physical cross-linking arising from their columnar structures. The release profiles of human IgG from the hydrogels were in accordance with the non-Fickian diffusion model. Importantly, the stabilities of human IgG included into the hydrogels against thermal and shaking stresses were markedly improved. These findings suggest that PEG/CyD PPRX hydrogels are useful to prepare the formulation for highly concentrated human IgG.

  2. [IgG4-related disease is a rare differential diagnosis of malignant and autoimmune diseases].

    Science.gov (United States)

    Storgaard, Anders; Detlefsen, Sönke

    2015-04-06

    Immunoglobulin G4-related disease (IgG4-RD) is an inflammatory and fibrotic disease with the potential to produce diffuse enlargement, massforming lesions or stenoses in a wide range of organs. Elevation of serum IgG4 concentration and high levels of IgG4-positive cells in the inflamed tissue are common denominators. Type 1 autoimmune pancreatitis is one of the main manifestations, and its recognition preceded the definition of IgG4-RD as a novel clinical entity. The aetiology, pathophysiology, epidemiology and clinical long-term outcome of IgG4-RD are not fully elucidated. Steroids are effective in most patients, sometimes combined with other antiinflammatory drugs.

  3. Avaliação das subclasses IgG1 e IgG3 na doença hemolítica perinatal Assessment of IgG1 and IgG3 subclasses in perinatal hemolytic disease

    Directory of Open Access Journals (Sweden)

    Maria A. Araújo

    2003-01-01

    Full Text Available A doença hemolítica perinatal (DHPN ainda é um problema clínico. Nenhum teste isolado prediz, com segurança, a gravidade do quadro hemolítico. O objetivo do presente estudo foi determinar as subclasses de anticorpos IgG1 e IgG3 por citometria de fluxo no soro de 42 gestantes isoimunizadas e correlacionar os dados obtidos com a gravidade da DHPN. A distribuição dos fetos ou neonatos segundo a gravidade do quadro hemolítico evidenciou 13 casos com doença leve, 16 casos com doença moderada e 13 com doença grave. As subclasses foram detectadas em 33/42 (79% amostras. A subclasse IgG1, isoladamente, foi evidenciada em 14/33 (42,4% casos. Na relação entre gravidade da doença e subclasses de IgG, observou-se que IgG1 isolada foi encontrada em todos os grupos, e os valores da mediana de intensidade de fluorescência (MIF foram significativamente mais altos nas formas mais graves da DHPN (pThe hemolytic disease of the newborn (HDN continues to be a clinical problem in spite of prophylaxis. To date, none of the available tests, developed to predict the severity of HDN, has provided complete reliability. The objective of the present study was to determine the IgG1 and IgG3 subclasses in 42 isoimmunized pregnant women, and to correlate them with clinical severity of hemolytic disease. The IgG subclasses were determined employing flow cytometry. According to the clinical severity of HDN, fetuses and newborn babies were classified as 13 mild, 16 moderate and 13 severe cases. The IgG subclasses were detected in 33 of the 42 pregnant women. Of these, IgG1 was predominant in 72.7% of the cases; either isolated (42.4% or in association with IgG3 (30.3%. IgG1 was present in all the three clinical severity categories, however, its values were significantly higher in cases with greater clinical severity of HDN (p<0.01. On the other hand, the distribution of IgG3 values within each group was not statistically significant (p=0.11. IgG3 seems to be more

  4. Anti-inflammatory activity of human IgG4 antibodies by dynamic Fab arm exchange.

    Science.gov (United States)

    van der Neut Kolfschoten, Marijn; Schuurman, Janine; Losen, Mario; Bleeker, Wim K; Martínez-Martínez, Pilar; Vermeulen, Ellen; den Bleker, Tamara H; Wiegman, Luus; Vink, Tom; Aarden, Lucien A; De Baets, Marc H; van de Winkel, Jan G J; Aalberse, Rob C; Parren, Paul W H I

    2007-09-14

    Antibodies play a central role in immunity by forming an interface with the innate immune system and, typically, mediate proinflammatory activity. We describe a novel posttranslational modification that leads to anti-inflammatory activity of antibodies of immunoglobulin G, isotype 4 (IgG4). IgG4 antibodies are dynamic molecules that exchange Fab arms by swapping a heavy chain and attached light chain (half-molecule) with a heavy-light chain pair from another molecule, which results in bispecific antibodies. Mutagenesis studies revealed that the third constant domain is critical for this activity. The impact of IgG4 Fab arm exchange was confirmed in vivo in a rhesus monkey model with experimental autoimmune myasthenia gravis. IgG4 Fab arm exchange is suggested to be an important biological mechanism that provides the basis for the anti-inflammatory activity attributed to IgG4 antibodies.

  5. IgG Adhesion on Hydrophobic Surfaces: Theory, Modelling, and Application to ELISA

    CERN Document Server

    de Thier, P

    2016-01-01

    Enzyme-Linked ImmunoSorbent Assays (ELISA) are a range of widely used analytical methods whose implementation requires to build antibodies (IgG) thin films onto surfaces predominantly made of polystyrene. The high hydrophobicity of polystyrene ensures a spontaneous and strong adhesion of proteins allowing to easily build IgG monolayers. Since the ELISA improvements definitely lie in the comprehension of physico-chemical mechanisms on which IgG immobilization on hydrophobic surfaces are relied, this work develops a theorization essay (thermodynamics of the so-called hydrophobic effect and of thin films building) emphasized by numerical modelling (random sequential additions model, i.e. RSA) and experimental estimations by atomic force microscopy (AFM) and ELISA. Keeping in mind the hydrophobic effect, thermodynamics (of irreversible processes) allows to explain why IgG adhesion on polystyrene occurs whereas numerical modelling approaches show a way of surface saturation leading to promote IgG orientations expe...

  6. First case of IgG4-related sclerosing cholangitis associated with autoimmune hemolytic anemia.

    Science.gov (United States)

    Masutani, Hironori; Okuwaki, Kosuke; Kida, Mitsuhiro; Yamauchi, Hiroshi; Imaizumi, Hiroshi; Miyazawa, Shiro; Iwai, Tomohisa; Takezawa, Miyoko; Koizumi, Wasaburo

    2014-07-14

    To our knowledge, patients with immunoglobulin G4-related sclerosing cholangitis (IgG4-SC) associated with autoimmune hemolytic anemia (AIHA) have not been reported previously. Many patients with IgG4-SC have autoimmune pancreatitis (AIP) and respond to steroid treatment. However, isolated cases of IgG4-SC are difficult to diagnose. We describe our experience with a patient who had IgG4-SC without AIP in whom the presence of AIHA led to diagnosis. The patient was a 73-year-old man who was being treated for dementia. Liver dysfunction was diagnosed on blood tests at another hospital. Imaging studies suggested the presence of carcinoma of the hepatic hilus and primary sclerosing cholangitis, but a rapidly progressing anemia developed simultaneously. After the diagnosis of AIHA, steroid treatment was begun, and the biliary stricture improved. IgG4-SC without AIP was thus diagnosed.

  7. IgG4-related disease simulating Hodgkin lymphoma in a child

    Directory of Open Access Journals (Sweden)

    D. Eric Ewing, MD

    2016-06-01

    Full Text Available Immunoglobulin (Ig G4-related disease is a recently described syndrome characterized by mass forming lymphoplasmacytic tissue infiltration and elevated serum IgG4 concentrations usually affecting middle-aged or older individuals. Lymphadenopathy is frequently observed and is sometimes the first or only manifestation of the disease. We report a case of IgG4-related disease mimicking Hodgkin lymphoma in a 13-year-old girl. The patient presented with progressive unilateral cervical lymphadenopathy of several months duration. Biopsy showed follicular hyperplasia with progressive transformation of germinal centers. Interfollicular areas were expanded by small lymphocytes, histiocytes, eosinophils and fibrosis with occasional CD30 positive cells initially concerning for interfollicular Hodgkin lymphoma. Immunohistochemical analysis revealed an intrafollicular plasmacytosis with an IgG4-positive/IgG-positive plasma cell ratio of 50% supporting a diagnosis of IgG4-related lymphadenopathy, progressively transformed germinal centers type. Laboratory studies were supportive with elevated serum IgG4 (178 mg/dL and IgE (30.40 kU/L levels along with an elevated serum IgG4/IgG ratio (0.16. Very few cases of IgG4-related disease have been described in children. Within this age group, there is considerable clinical overlap between IgG4-related disease associated lymphadenopathy and Hodgkin lymphoma. In addition, lymphadenopathy secondary to IgG4-related disease demonstrates substantial histologic diversity with the potential to simulate the inflammatory background and fibrosis of Hodgkin lymphoma. The importance of accurate diagnosis is underscored by the prognostic implications considering the marked response of the syndrome to steroid therapy. In addition, appropriate follow up is critical to monitor for relapse and additional organ involvement.

  8. Toxocara seroprevalence in children from a subtropical city in Argentina Prevalencia de anticuerpos anti Toxocara en niños de una ciudad subtropical de Argentina

    Directory of Open Access Journals (Sweden)

    José Mario ALONSO

    2000-08-01

    Full Text Available Most studies from Argentina have focused on toxocariasis as an environmental problem of big cities, and there are no available data about children infection from small or middle-sized cities. In order to assess the prevalence of anti-Toxocara antibodies in infantile population, 206 children from Resistencia, of both sexes, aged 1-14 years old were studied by Elisa testing with E/S T. canis L2 antigens. Hematological parameters and immunoglobulin levels were determined; five days' stool samples were studied and epidemiological data were obtained by means of a questionnaire to parents. Results showed that 73% of the children had one or more dogs living at home, 57% reported geophagia and 37.9% were positive for Toxocara serology, but there was no significant difference in prevalence neither for boys and girls, nor concerning age. An increased risk of infection was observed in age groups 5-6 and 7-8 for boys, and in age groups 3-4 and 5-6 for girls.La mayoría de los estudios realizados en Argentina, han enfocado a la Toxocariosis como un problema medioambiental propio de las grandes ciudades y no existen datos acerca de esta infección entre los niños de ciudades medianas o pequeñas. A fin de determinar la prevalencia de anticuerpos anti-Toxocara en la población infantil de la ciudad de Resistencia, se estudiaron 206 niños de ambos sexos, con edades comprendidas entre los 1-14 años, mediante el test de Elisa, empleando antígenos E/S de larva L2 de Toxocara canis. También se evaluaron los niveles de inmunoglobulinas séricas y los parámetros hematológicos; se efectuaron análisis coproparasitológico seriados en heces de 5 días y se recolectó información epidemiológica mediante cuestionario a los padres. Los resultados obtenidos señalan que el 73% de los niños tenían uno o mas perros viviendo en la casa, que el 57% tenían antecedentes de geofagia y que el 37.9% tenían serología positiva para Toxocara, aunque no hubo diferencias

  9. Circulating IgG autoantibodies to IgE in atopic syndromes.

    Science.gov (United States)

    Quinti, I; Brozek, C; Wood, N; Geha, R S; Leung, D Y

    1986-04-01

    Sera from nonatopic healthy donors and patients with hyper-IgE syndrome, allergic respiratory disease, i.e., allergic rhinitis and asthma, and atopic dermatitis were assayed for the presence of IgG and IgM antibodies to IgE. The assay used was based on an ELISA method that measured the binding of IgG or IgM in test sera to myeloma IgE (PS)-coated microtiter wells. The levels of IgG anti-IgE but not of IgM anti-IgE were elevated in patient sera of all three categories tested. The same sera failed to demonstrate increased levels of IgG anti-IgM or IgG anti-IgA. Significant IgG anti-IgE activity remained after absorption of patient sera over pooled human IgG F(ab')2 Sepharose. The IgG anti-IgE activity appeared to be directed toward the Fc portion of IgE because absorption of positive sera over IgE (ADZ) Sepharose but not over myeloma IgG Sepharose completely removed their reactivity with IgE (PS) and because sera from atopic individuals but not from normal subjects contained IgG anti-IgE activity against the protein backbone of the Fc portion of IgE synthesized from a fragment of the cloned gene of human myeloma IgE (ND) heavy chain. Regression analysis demonstrated a weak but significant correlation (r = 0.31; p less than 0.05) between serum IgE levels and IgG anti-IgE activity. Fractionation of sera from the three patient categories by gel filtration over Sepharose 6B revealed that IgG anti-IgE activity was present both as monomeric IgG and in IgE containing immune complexes (IC). Intermediate molecular size IC (between 7S and 19S) were present in all three patient groups.(ABSTRACT TRUNCATED AT 250 WORDS)

  10. Toxoplasma-SPECIFIC IgG SUBCLASS ANTIBODY RESPONSE IN CEREBROSPINAL FLUID SAMPLES FROM PATIENTS WITH CEREBRAL TOXOPLASMOSIS

    Directory of Open Access Journals (Sweden)

    Fernanda S. NASCIMENTO

    2015-10-01

    Full Text Available SUMMARY Cerebral toxoplasmosis can be highly debilitating and occasionally fatal in persons with immune system deficiencies. In this study, we evaluated the Toxoplasma gondii-specific IgG subclass antibody response in 19 cerebrospinal fluid (CSF samples from patients with cerebral toxoplasmosis who had a positive IgG anti-T. gondii ELISA standardized with a cyst antigen preparation. There were no significant differences between the rates of positivity and the antibody concentrations (arithmetic means of the ELISA absorbances, MEA for IgG1 and IgG2, but the rates of positivity and MEA values for these two IgG subclasses were significantly higher than those for IgG3 and IgG4. The marked IgG2 response in CSF from patients with cerebral toxoplasmosis merits further investigation.

  11. Toxoplasma-SPECIFIC IgG SUBCLASS ANTIBODY RESPONSE IN CEREBROSPINAL FLUID SAMPLES FROM PATIENTS WITH CEREBRAL TOXOPLASMOSIS.

    Science.gov (United States)

    Nascimento, Fernanda S; Suzuki, Lisandra A; Branco, Nilson; Franco, Regina M B; Andrade, Paula D; Costa, Sandra C B; Pedro, Marcelo N; Rossi, Cláudio L

    2015-01-01

    Cerebral toxoplasmosis can be highly debilitating and occasionally fatal in persons with immune system deficiencies. In this study, we evaluated the Toxoplasma gondii-specific IgG subclass antibody response in 19 cerebrospinal fluid (CSF) samples from patients with cerebral toxoplasmosis who had a positive IgG anti-T. gondii ELISA standardized with a cyst antigen preparation. There were no significant differences between the rates of positivity and the antibody concentrations (arithmetic means of the ELISA absorbances, MEA) for IgG1 and IgG2, but the rates of positivity and MEA values for these two IgG subclasses were significantly higher than those for IgG3 and IgG4. The marked IgG2 response in CSF from patients with cerebral toxoplasmosis merits further investigation.

  12. Igg Subclasses Targeting the Flagella of Salmonella enterica Serovar Typhimurium Can Mediate Phagocytosis and Bacterial Killing

    Science.gov (United States)

    Goh, Yun Shan; Armour, Kathryn L; Clark, Michael R; Grant, Andrew J; Mastroeni, Pietro

    2016-01-01

    Invasive non-typhoidal Salmonella are a common cause of invasive disease in immuno-compromised individuals and in children. Multi-drug resistance poses challenges to disease control, with a critical need for effective vaccines. Flagellin is an attractive vaccine candidate due to surface exposure and high epitope copy number, but its potential as a target for opsonophacytic antibodies is unclear. We examined the effect of targeting flagella with different classes of IgG on the interaction between Salmonella Typhimurium and a human phagocyte-like cell line, THP-1. We tagged the FliC flagellar protein with a foreign CD52 mimotope (TSSPSAD) and bacteria were opsonized with a panel of humanised CD52 antibodies with the same antigen-binding V-region, but different constant regions. We found that IgG binding to flagella increases bacterial phagocytosis and reduces viable intracellular bacterial numbers. Opsonisation with IgG3, followed by IgG1, IgG4, and IgG2, resulted in the highest level of bacterial uptake and in the highest reduction in the intracellular load of viable bacteria. Taken together, our data provide proof-of-principle evidence that targeting flagella with antibodies can increase the antibacterial function of host cells, with IgG3 being the most potent subclass. These data will assist the rational design of urgently needed, optimised vaccines against iNTS disease. PMID:27366588

  13. Concurrent systemic AA amyloidosis can discriminate primary sclerosing cholangitis from IgG4-associated cholangitis

    Institute of Scientific and Technical Information of China (English)

    Takehiro Kato; Atsumasa Komori; Sung-Kwan Bae; Kiyoshi Migita; Masahiro Ito; Yasuhide Motoyoshi; Seigo Abiru; Hiromi Ishibashi

    2012-01-01

    Chronic hepatobiliary inflammatory diseases are not widely acknowledged as underlying disorders of systemic AA amyloidosis, except epidemic schistosomiasis. Among them, primary sclerosing cholangitis (PSC) might initiate amyloid A protein deposition in diverse tissues, giving rise to systemic amyloidosis, due to a progressive and unresolved inflammatory process, and its possible association with inflammatory bowel diseases. Nevertheless, only one such case has been reported in the literature to date. We report a 69-yearold Japanese woman with cirrhosis who was diagnosed with PSC complicated with systemic AA amyloidosis, without any evidence of other inflammatory disorders. As a result of cholestasis in conjunction with biliary strictures and increased serum IgG4, the presence of IgG4+ plasma cells was examined systemically, resulting in unexpected documentation of Congo-red-positive amyloid deposits, but not IgG4+ plasma cells, in the liver, stomach and salivary glands. Elevated serum IgG4 is the hallmark of IgG4-related disease, including IgG4-associated cholangitis, but it has also been demonstrated in certain patients with PSC. Amyloid A deposits in multiple organs associated with an indolent clinical course that progresses over many years might have a diagnostic value in discriminating PSC from IgG4-associated cholangitis.

  14. Enhanced FCGR2A and FCGR3A signaling by HIV viremic controller IgG

    Science.gov (United States)

    Alvarez, Raymond A.; Maestre, Ana M.; Durham, Natasha D.; Barria, Maria Ines; Ishii-Watabe, Akiko; Tada, Minoru; Hotta, Mathew T.; Rodriguez-Caprio, Gabriela; Fierer, Daniel S.; Fernandez-Sesma, Ana; Simon, Viviana; Chen, Benjamin K.

    2017-01-01

    HIV-1 viremic controllers (VC) spontaneously control infection without antiretroviral treatment. Several studies indicate that IgG Abs from VCs induce enhanced responses from immune effector cells. Since signaling through Fc-γ receptors (FCGRs) modulate these Ab-driven responses, here we examine if enhanced FCGR activation is a common feature of IgG from VCs. Using an infected cell–based system, we observed that VC IgG stimulated greater FCGR2A and FCGR3A activation as compared with noncontrollers, independent of the magnitude of HIV-specific Ab binding or virus neutralization activities. Multivariate regression analysis showed that enhanced FCGR signaling was a significant predictor of VC status as compared with chronically infected patients (CIP) on highly active antiretroviral therapy (HAART). Unsupervised hierarchical clustering of patient IgG functions primarily grouped VC IgG profiles by enhanced FCGR2A, FCGR3A, or dual signaling activity. Our findings demonstrate that enhanced FCGR signaling is a common and significant predictive feature of VC IgG, with VCs displaying a distinct spectrum of FCGR activation profiles. Thus, profiling FCGR activation may provide a useful method for screening and distinguishing protective anti-HIV IgG responses in HIV-infected patients and in monitoring HIV vaccination regimens.

  15. Concurrent systemic AA amyloidosis can discriminate primary sclerosing cholangitis from IgG4-associated cholangitis.

    Science.gov (United States)

    Kato, Takehiro; Komori, Atsumasa; Bae, Sung-Kwan; Migita, Kiyoshi; Ito, Masahiro; Motoyoshi, Yasuhide; Abiru, Seigo; Ishibashi, Hiromi

    2012-01-14

    Chronic hepatobiliary inflammatory diseases are not widely acknowledged as underlying disorders of systemic AA amyloidosis, except epidemic schistosomiasis. Among them, primary sclerosing cholangitis (PSC) might initiate amyloid A protein deposition in diverse tissues, giving rise to systemic amyloidosis, due to a progressive and unresolved inflammatory process, and its possible association with inflammatory bowel diseases. Nevertheless, only one such case has been reported in the literature to date. We report a 69-year-old Japanese woman with cirrhosis who was diagnosed with PSC complicated with systemic AA amyloidosis, without any evidence of other inflammatory disorders. As a result of cholestasis in conjunction with biliary strictures and increased serum IgG4, the presence of IgG4(+) plasma cells was examined systemically, resulting in unexpected documentation of Congo-red-positive amyloid deposits, but not IgG4(+) plasma cells, in the liver, stomach and salivary glands. Elevated serum IgG4 is the hallmark of IgG4-related disease, including IgG4-associated cholangitis, but it has also been demonstrated in certain patients with PSC. Amyloid A deposits in multiple organs associated with an indolent clinical course that progresses over many years might have a diagnostic value in discriminating PSC from IgG4-associated cholangitis.

  16. Myocarditis in different experimental models infected by Trypanosoma cruzi is correlated with the production of IgG1 isotype.

    Science.gov (United States)

    Caldas, Ivo Santana; Diniz, Livia de Figueiredo; Guedes, Paulo Marcos da Matta; Nascimento, Álvaro Fernando da Silva do; Galvão, Lúcia Maria da Cunha; Lima, Wanderson Geraldo de; Caldas, Sérgio; Bahia, Maria Terezinha

    2017-03-01

    This study was designed to verify the relationship between IgG antibodies isotypes and myocarditis in Trypanosoma cruzi infection using mice and dogs infected with different T. cruzi strains. The animals were infected with benznidazole-susceptible Berenice-78 and benznidazole-resistant AAS and VL-10 strains. The IgG subtypes were measured in serum samples from dogs (IgG, IgG1, and IgG2) and mice (IgG, IgG1, IgG2a, and IgG2b). The infection of dogs with VL-10 strain induced the highest levels of heart inflammation while intermediate and lower levels were detected with Berenice-78 and AAS strains, respectively. Similar results were found in mice infected with VL-10, but not in those infected with AAS or Berenice-78 strains. The AAS strain induced higher levels of heart inflammation in mice, while Berenice-78 strain was not able to induce it. Correlation analysis between myocarditis and antibody reactivity index revealed very interesting results, mainly for IgG and IgG1, the latter being the most exciting. High IgG1 showed a significant correlation with myocarditis in both experimental models, being more significant in dogs (r=0.94, pmyocarditis intensity in Chagas disease.

  17. Clinicopathological features of Riedel's thyroiditis associated with IgG4-related disease in Japan.

    Science.gov (United States)

    Takeshima, Ken; Inaba, Hidefumi; Ariyasu, Hiroyuki; Furukawa, Yasushi; Doi, Asako; Nishi, Masahiro; Hirokawa, Mitsuyoshi; Yoshida, Akira; Imai, Ryoukichi; Akamizu, Takashi

    2015-01-01

    Riedel's thyroiditis (RT) is a rare chronic fibrosing disorder characterized by a hard, infiltrative lesion in the thyroid gland, which is often associated with multifocal fibrosclerosis. Immunoglobulin G4-related disease (IgG4-RD) is typified by infiltration of IgG4-positive plasma cells into multiple organs, resulting in tissue fibrosis and organ dysfunction. In order to evaluate the clinicopathological features of RT and its relationship with IgG4-RD, we performed a Japanese literature search using the keywords "Riedel" and "Riedel's thyroiditis." We used the electronic databases Medline and Igaku Chuo Zasshi, the latter of which is the largest medical literature database in Japan. The diagnosis of RT was based on the presence of a fibroinflammatory process with extension into surrounding tissues. Only 10 patients in Japan fulfilled RT diagnostic criteria during the 25-year period between 1988 and 2012. Two patients with confirmed IgG4/IgG immunohistochemical findings demonstrated 43 and 13 IgG4-positive plasma cells per high-power field, respectively, and the IgG4-positive/IgG-positive plasma cell ratios of 20% and less than 5%. Of the 10 patients with RT, two received glucocorticoids, one of whom experienced marked shrinkage of the thyroid lesion. One patient had extra-thyroid involvement in the form of retroperitoneal fibrosis. Although the clinicopathological features of RT suggest that IgG4-RD may be the underlying condition in some cases, further investigation is needed to clarify the etiology of RT in relation to IgG4-RD.

  18. Estrés psicosocial, reactividad al estrés y marcadores bioquímicos LDL-Oxidada y anti-HSP60: Su relación en el ACV isquémico

    OpenAIRE

    Rodriguez de Cruz, Norys Margarita

    2016-01-01

    Tesis doctoral inédita, leída en la Universidad Autónoma de Madrid. Facultad de Medicina, Departamento de Psiquiatría. Fecha de lectura: 9 de febrero, 2016 A objeto de comparar y relacionar el estrés psicosocial, el índice de reactividad al estrés, la LDL oxidada y anticuerpos anti-HSP60 en individuos con enfermedad cerebrovascular isquémica (ACV) y sus respectivos controles (con similar edad y sexo), a 32 individuos de cada grupo les fue medido el estrés psicosocial por la esc...

  19. IgG4-Related Hypophysitis: Case Report and Literature Review.

    Science.gov (United States)

    Decker, Lauren; Crawford, Angela M; Lorenzo, Gamaliel; Stippler, Martina; Konstantinov, Konstantin N; SantaCruz, Karen

    2016-12-01

    IgG4-related hypophysitis is a rare, inflammatory process of the pituitary that mimics more commonly seen pituitary tumors. We report a case of IgG4-related hypophysitis in a 16-year-old female with diabetes insipidus who was found to have IgG4-related hypophysitis based on tissue diagnosis. This entity has not been previously described in a pediatric patient. Recognition of certain inflammatory processes of the pituitary may lead to alternative means of diagnosis and medical management without a biopsy.

  20. Distinct histopathological features of Hashimoto's thyroiditis with respect to IgG4-related disease.

    Science.gov (United States)

    Li, Yaqiong; Zhou, Gengyin; Ozaki, Takashi; Nishihara, Eijun; Matsuzuka, Fumio; Bai, Yanhua; Liu, Zhiyan; Taniguchi, Emiko; Miyauchi, Akira; Kakudo, Kennichi

    2012-08-01

    A form of Hashimoto's thyroiditis with lymphoplasmacytic sclerosing changes and increased numbers of IgG4-positive plasma cells has recently been reported in the literature. These histopathological features suggest that this subtype of Hashimoto's thyroiditis may be closely related to IgG4-related disease. Therefore, this unique form of IgG4-related Hashimoto's thyroiditis, which is referred to as IgG4 thyroiditis, has its own clinical, serological, and sonographic features that are distinct from those associated with non-IgG4 thyroiditis. IgG4 thyroiditis shares similarities with the well-known fibrous variant of Hashimoto's thyroiditis; however, the detailed histopathological features of IgG4 thyroiditis have not been well established. Based on immunostaining results, 105 patients with Hashimoto's thyroiditis were divided into an IgG4 thyroiditis group (n=28) and a non-IgG4 thyroiditis group (n=77). As in our previous reports, IgG4 thyroiditis was associated with a patient population of a younger age, a lower female-to-male ratio, rapid progression, higher levels of thyroid autoantibodies, subclinical hypothyroidism, and diffuse sonographic echogenicity. Histopathologically, this group revealed severe lymphoplasmacytic infiltration, dense stromal fibrosis, marked follicular cell degeneration, numerous micro-follicles, and notable giant cell/histiocyte infiltration. Importantly, the IgG4-related group did not completely overlap with fibrous variant of Hashimoto's thyroiditis. Four cases (14%) in the IgG4 thyroiditis group presented only mild fibrosis in the stroma, whereas 29 cases (38%) in the non-IgG4 thyroiditis group met the diagnostic criteria for fibrous variant of Hashimoto's thyroiditis. Furthermore, we observed three patterns of stromal fibrosis in Hashimoto's thyroiditis: interfollicular fibrosis, interlobular fibrosis, and scar fibrosis. The IgG4 thyroiditis group was significantly associated with the presence of predominant interfollicular fibrosis. In

  1. Development time of IgG antibodies to West Nile virus.

    Science.gov (United States)

    Papa, Anna; Danis, Kostas; Tsergouli, Katerina; Tsioka, Katerina; Gavana, Elpida

    2011-09-01

    Following an outbreak of West Nile virus (WNV) infections in Greece during summer/autumn 2010, a study was conducted to investigate the patterns of WNV IgG reactivity in 255 patients with respect to the day of illness and the type of clinical syndrome. IgG antibodies were detectable after a mean of 8.1 ± 4.9 and 12.6 ± 11.3 days after onset of illness in neuroinvasive and non-neuroinvasive cases, respectively (p < 0.001), suggesting that a delay in the development of WNV IgG antibodies is seen in non-neuroinvasive cases.

  2. Immunoglobulin G4-related cholangitis: a variant of IgG4-related systemic disease.

    Science.gov (United States)

    Novotný, Ivo; Dítě, Petr; Trna, Jan; Lata, Jan; Husová, Libuše; Geryk, Edvard

    2012-01-01

    IgG4-related sclerosing cholangitis as part of IgG4 systemic-related diseases is commonly associated with autoimmune pancreatitis. Major clinical manifestations of IgG4-related sclerosing diseases are apparent in the organs in which tissue fibrosis with obstructive phlebitis is pathologically induced. IgG4-related sclerosing cholangitis is included within the heterogeneous group of 'sclerosing cholangitis'. Sclerosing cholangitis may be associated with choledocholithiasis, infection or biliary malignancies. Sclerosing cholangitis of unknown etiology is called primary sclerosing cholangitis (PSC). Conservative therapy of PSC is usually unsuccessful, the disease involves extra- and/or intrahepatic biliary tree, and the end point of this disease is liver cirrhosis. Typically, PSC is identified at the age of 30 to 40 years, and the disease is frequently associated with inflammatory bowel diseases. On the other hand, IgG4-related sclerosing cholangitis is not associated with inflammatory bowel diseases. In patients with IgG4-related sclerosing cholangitis, a first symptom can be obstructive jaundice, whereas obstructive jaundice is rarely present in PSC. Clinically, patients with IgG4-related sclerosing cholangitis are older at diagnosis compared to patients with PSC. A typical diagnostic feature of IgG4-related sclerosing cholangitis is elevation of serum immunoglobulin G4. In patients with IgG4-related sclerosing cholangitis, response to steroid therapy is high; in patients with PSC corticosteroid therapy is unsuccessful. Histochemically abundant infiltration of IgG4-positive plasma cells is detected in the biliary duct wall. Histologically, we can identify dense lymphoplasmacytic infiltration of the bile duct wall, transmural fibrosis, lymphoplasmacytic infiltration and fibrosis in the periportal area of the liver - a typically obliterative phlebitis. The biliary epithelium is usually intact in contrast to PSC, where mucosal erosion is often present. Steroids are the

  3. A circulating complex between ASAT and IgG in serum in an apparently healthy woman.

    Science.gov (United States)

    Fex, G; Berntorp, K

    1987-04-15

    An elevated level of serum aspartate aminotransferase (ASAT) activity in a subjectively healthy woman was shown to be due to circulating ASAT:IgG complexes. The complexes were demonstrated by taking advantage of the specific interaction between protein A and IgG. Thus, greater than 90% of the patient's ASAT activity in serum could be bound to protein A-Sepharose demonstrating that nearly all the patient's serum ASAT was complexed to IgG. The ASAT-binding capacity of patient serum was calculated as approximately 850 micrograms ASAT/l which corresponds to about 0.01% of patient's IgG.

  4. Colovesical fistula caused by glucocorticoid therapy for IgG4-related intrapelvic mass

    OpenAIRE

    2015-01-01

    IgG4-related disease (IgG4-RD) is an immune-mediated fibroinflammatory disorder that can occur in almost all systemic organs and generally responds to corticosteroid treatment. We report a rare case of an IgG4-related intrapelvic mass lesion that responded to steroid therapy but caused a fistula between the sigmoid colon and bladder. A 71-year-old man was followed after treatment for hepatocellular carcinoma. Follow-up computed tomography (CT) incidentally depicted left hydronephrosis with an...

  5. Acute tubulointerstitial nephritis with severe renal impairment associated with multisystem IgG4-related disease.

    Science.gov (United States)

    Beltrame, Rafael Coimbra Ferreira; Friderichs, Maurício; Fior, Bárbara Rayanne; Schaefer, Pedro Guilherme; Thomé, Gustavo Gomes; Silva, Dirceu Reis da; Barros, Elvino José Guardão; Seligman, Renato; Veronese, Francisco Veríssimo

    2016-01-01

    The IgG4-related disease has a wide clinical spectrum where multiple organs can be affected, and the diagnosis depends on typical histopathological findings and an elevated IgG4 expression in plasma cells in the affected tissue. We describe the clinical presentation and evolution of a patient with acute tubulointerstitial nephritis, severe kidney failure and systemic manifestations such as lymphadenomegaly and chronic pancreatitis. The diagnosis was confirmed by the clinical picture and kidney and lymph node histopathology, in which immunohistochemistry of the lymphoid tissue showed policlonality and increased expression of IgG4, with a IgG4/total IgG ratio > 80%. The patient was treated with prednisone at a dose of 60 mg/day, followed by mycophenolate mofetil, and showed clinical and renal function improvement at 6 months of follow-up. The high index of suspicion of IgG4-related disease with multisystem involvement and the early treatment of this condition are essential to improve the prognosis of affected patients. Resumo A doença relacionada à IgG4 tem um espectro clínico amplo em que múltiplos órgãos podem ser afetados, e o diagnóstico depende de achados histopatológicos típicos e elevada expressão de IgG4 em plasmócitos no tecido afetado. Descrevemos o quadro clínico e a evolução de um paciente com nefrite túbulo-intersticial aguda, insuficiência renal grave e manifestações sistêmicas como linfoadenomegalias e pancreatite crônica. O diagnóstico foi confirmado pelas características clínicas e pela histopatologia renal e de linfonodo, na qual a imunohistoquímica mostrou tecido linfoide com policlonalidade e expressão aumentada de IgG4, com uma relação IgG4/IgG total > 80%. O paciente foi tratado com prednisona na dose de 60 mg/dia, seguido de micofenolato mofetil, e apresentou melhora clínica e da função renal depois de 6 meses de tratamento. O alto índice de suspeição da doença relacionada ao IgG4 com comprometimento multissist

  6. Rinitis alérgica en niños. Su relación con alergenos en el ambiente.

    OpenAIRE

    Reyes, Marco A.

    2009-01-01

    La rinitis alérgica es una entidad frecuente en niños. Se asocia con otros síndromes alérgicos como asma, dermatitis atópica, sinusitis, conjuntivitis. Se caracteriza por inflamación crónica de la mucosa nasal debida a la liberación de enzimas producidas por la interacción de anticuerpos IgE que sensibilizan mastocitos y células inflamatorias y alergenos, enzimas que actúan sobre vasos, glándulas y receptores neurogénicos. Los aereoalergenos varían de un lugar a otro. En Cali, 264 niños con r...

  7. Extracellular polysaccharides do not inhibit the reaction between Streptococcus mutans and its specific immunoglobulin G (IgG) or penetration of the IgG through S. mutans biofilm.

    Science.gov (United States)

    Zhu, M; Takenaka, S; Sato, M; Hoshino, E

    2001-02-01

    The present study investigated whether extracellular polysaccharides inhibit reaction between Streptococcus mutans and its specific immunoglobulin G (IgG) and penetration of the IgG through S. mutans biofilm. The planktonic organisms with or without extracellular polysaccharides were prepared, incubated with rabbit IgG against whole cell of S. mutans and fluorescein isothiocyanate (FITC)-conjugated goat affinity purified antibody to rabbit IgG. Biofilms with or without extracellular polysaccharides were formed on cover glasses and incubated with rabbit IgG against S. mutans and FITC-conjugated goat antibody to rabbit IgG. Then, biofilms were stained with propidium iodide. The amount of specific IgG binding on S. mutans was determined by FITC intensity with a fluorescence microplate reader. The penetration of IgG through biofilms was determined by confocal laser scanning microscopy. The results showed that the fluorescence intensity of FITC in planktonic organisms with extracellular polysaccharides was similar to that in planktonic organisms without extracellular polysaccharides, indicating that extracellular polysaccharides did not inhibit the reaction between S. mutans and its specific IgG. Although biofilms of S. mutans with extracellular polysaccharides were much thicker and denser than those without extracellular polysaccharides, the speed with which IgG penetrated through both of the biofilms did not differ significantly, suggesting that penetration of IgG through S. mutans biofilm was not affected by extracellular polysaccharides.

  8. Dynamics evaluation of total IgG, IgG1 and IgG2a in the serum of mice immunized with radioattenuated paracoccidioides brasiliensis yeast cells

    Energy Technology Data Exchange (ETDEWEB)

    Martins, Estefania M.N.; Andrade, Antero S.R. [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil)]. E-mail: estefaniabio@yahoo.com.br; antero@cdtn.br; Reis, Bernardo S.; Goes, Alfredo M. [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Dept. de Bioquimica e Imunologia]. E-mail: brsgarbi@mono.icb.ufmg.br; goes@mono.icb.ufmg.br

    2007-07-01

    Paracoccidioides brasiliensis is the fungus agent of paracoccidioidomycosis, a deep-seated systemic infection of humans. Up to the moment no vaccine has still been reported. The potential of gamma radiation for pathogens attenuation and vaccine development was explored in this work. In our laboratory we developed radioattenuated yeast cells of P. brasiliensis and the aim of the present work was to evaluate the antibody production dynamics in mice immunized with this cells. Were analyzed the IgG antibodies titers as well as the type of response by analyzing the IgG1 and IgG2a antibody pattern in the course of infection. The mice were divided in two groups that were immunized one time and two times respectively. The mice infected with the virulent P. brasiliensis showed a high level of antibody production while the infection with the radioattenuated yeast did not significantly change the antibody level. The level of IgG raised in both immunized groups after the challenge. In the group immunized one time was not observed a significant difference between the levels of both subclasses when compared with the control. After the challenge of the group immunized two times the IgG2a levels increased significantly when analyzed 90 days post challenge. We concluded that a pattern related to the disease control was apparent in the group submitted to two immunizations. The mice had not developed a totally polarized pattern of TH1/TH2 response but a trend to a TH1 response was evident. (author)

  9. [An IgG4-related pancreatitis mimicking an adenocarcinoma: A case report].

    Science.gov (United States)

    Courcet, Emilie; Beltjens, Françoise; Charon-Barra, Céline; Guy, France; Orry, David; Ghiringhelli, François; Arnould, Laurent

    2015-12-01

    Type 1 auto-immune pancreatitis (type 1 AIP) is the pancreatic manifestation of IgG4-related systemic disease (IgG4-RD). This disease has recently been individualized and is characterized by elevated serum IgG4 levels and extrapancreatic lesions with common histologic characteristic: dense infiltration of lymphocytes, IgG4-positive plasma cells and storiforme fibrosis. Obliterative phlebitis is frequently detected. The pancreas is frequently involved in this disease. As approach to the pancreas for histological examination is generally difficult, AIP is diagnosed using a combination of clinical, serological, morphological and histopathological features. In pseudotumoral cases, AIP can be misdiagnosed as pancreatic cancer. Since AIP responds dramatically to steroid therapy, accurate diagnosis of AIP can avoid unnecessary laparotomy or pancreatic resection. We report here a case of a patient who underwent surgery for presumed pancreatic cancer. The final diagnosis was type 1 AIP.

  10. Perivascular fibrosis and IgG4-related disease: a case report

    Directory of Open Access Journals (Sweden)

    S. Monti

    2014-11-01

    Full Text Available Immunoglobulin G4-related disease (IgG4-RD is a newly recognized fibroinflammatory condition which can potentially involve any organ. Some characteristic histopathologic features with lymphoplasmacytic infiltrate, an increased number of IgG4+ cells, storiform fibrosis and obliterative phlebitis are the mainstay for diagnosis. Serum IgG4 levels often increase. We report the case of a patient with perivascular fibrotic lesions involving the aortic arch and the splenic hilum, with a surgical biopsy-proven diagnosis of IgG4-related disease. The patient is now undergoing a low-dose corticosteroid maintenance therapy without evidence of new localizations of the disease. This case highlights the need for increasing awareness and recognition of this new, emerging clinical condition.

  11. IgG4-related cholecystitis presenting as biliary malignancy: report of three cases.

    Science.gov (United States)

    Feely, Michael M; Gonzalo, David H; Corbera, Montserrat; Hughes, Steven J; Trevino, Jose G

    2014-09-01

    An increased awareness of IgG4-related diseases has led to an escalation in the number of sites known to be involved by this fibroinflammatory disease. We report three cases of IgG4-related cholecystitis which were thought to represent biliary malignancies both clinically and radiographically. All three cases underwent surgery tailored towards presumed malignant neoplasms. Only following pathologic examination was the true nature of the disease identified. Recognition of the clinical, radiographic, and pathologic presentation of IgG4-related cholecystitis is essential for the consideration of this disease process prior to surgical management for suspected gallbladder malignancies. However, the pre-operative diagnosis remains challenging and extensive surgical intervention is often necessary given the distressing presentation of IgG4-related cholecystitis.

  12. Interactions between DMPC liposomes and the serum blood proteins HSA and IgG.

    Science.gov (United States)

    Sabín, Juan; Prieto, Gerardo; Ruso, Juan M; Messina, Paula V; Salgado, Francisco J; Nogueira, Montserrat; Costas, Miguel; Sarmiento, Félix

    2009-02-12

    The interaction between two serum blood proteins, namely human serum albumin (HSA) and human immunoglobulin G (IgG), with 1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine (DMPC) liposomes has been studied in detail using dynamic light scattering, flow cytometry, enzyme-linked immunosorbent assay (ELISA), electrophoretic mobility, differential scanning calorimetry (DSC), and surface tension measurements. HSA and IgG interact with liposomes forming molecular aggregates that remain stable at protein concentrations beyond those of total liposome coverage. Both HSA and IgG penetrate into the liposome bilayer. An ELISA assay indicates that the Fc region of IgG is the one that is immersed in the DMPC membrane. The liposome-protein interaction is mainly of electrostatic nature, but an important hydrophobic contribution is also present.

  13. The Emerging Importance of IgG Fab Glycosylation in Immunity.

    Science.gov (United States)

    van de Bovenkamp, Fleur S; Hafkenscheid, Lise; Rispens, Theo; Rombouts, Yoann

    2016-02-15

    Human IgG is the most abundant glycoprotein in serum and is crucial for protective immunity. In addition to conserved IgG Fc glycans, ∼15-25% of serum IgG contains glycans within the variable domains. These so-called "Fab glycans" are primarily highly processed complex-type biantennary N-glycans linked to N-glycosylation sites that emerge during somatic hypermutation. Specific patterns of Fab glycosylation are concurrent with physiological and pathological conditions, such as pregnancy and rheumatoid arthritis. With respect to function, Fab glycosylation can significantly affect stability, half-life, and binding characteristics of Abs and BCRs. Moreover, Fab glycans are associated with the anti-inflammatory activity of IVIgs. Consequently, IgG Fab glycosylation appears to be an important, yet poorly understood, process that modulates immunity.

  14. Diagnostic value of CagA IgG in the process to eradicate Helicobacter pylori

    Institute of Scientific and Technical Information of China (English)

    Zhi Bang Yang; Pi Long Wang; Ming Ming Gu; Li Hao Chen; Quan Chen; Lin Zhan

    2000-01-01

    AIM To investigate the diagnostic value of CagA IgG in serum.METHODS Seventy three patients with peptic ulcer infected with HP were eradicated by antibioticstherapy. At pretreatment, wk9 and wk20 after treatment, the detection of Hp in gastric muscosa bybacteriologic method were performed, and CagA and whole-cell antigen of HP igG in serum by ELISAmethod were also performed at the same time.RESULTS The IgG titres of Hp CagA and whole-cell antigen changes in accordance with the efficacy ofHp eradicated. The former with an earlier appearance and a greater number of cases decreased to normallevel in comparison with the latter.CONCLUSION CagA IgG is a better index for observing the effectiveness of the eradication of Hp.

  15. IgG1 variations in the colostrum of Holstein dairy cows.

    Science.gov (United States)

    Le Cozler, Y; Guatteo, R; Le Dréan, E; Turban, H; Leboeuf, F; Pecceu, K; Guinard-Flament, J

    2016-02-01

    High-immune quality colostrum (IgG1 concentration ⩾50 g/l) is crucial for the health and development of the young calf. Studies on colostrum quality tend to focus on external factors such as breed, parity or dry period length, but few have focused on within-cow variations. Here we ran experiments to gain a deeper insight into within-cow variation in IgG1 concentrations in dairy cow colostrum. Trials were performed in an experimental farm, located in the Western part of France. Colostrum from each quarter and a composite sample (mix of four quarters) were concomitantly collected on 77 Holstein dairy cows just after calving to assess the influence of sample type on IgG1 concentrations. Variation in IgG1 concentrations during the first milking was studied on samples from nine cows collected every minute from the start of milking. Repeatability of colostral IgG1 concentration was estimated from 2009 and 2010 data on 16 healthy cows. IgG1 concentrations were tested using a radial immunodiffusion method. Sensitivity and specificity were similar regardless of sample type tested (individual quarter or composite milk). Mean average IgG1 concentration was 54.1 g/l in composite colostrum, and was significantly higher in hind quarter teats (56.2 g/l) than front quarter teats (53.1 g/l). Average IgG1 concentration did not change significantly during colostrum milking, and the variations observed (15% or less) were likely due to the laboratory method (CV 15%). IgG1 concentrations in dam colostrum increased slightly from 2009 to 2010 due to BW and parity effects. In 56% of cases, colostrum quality could have been assessed on either individual or composite colostrum samples collected at any time during the first milking without affecting the reliability of the measurement. However, in other cases, differences were significant enough to mean that estimates of average IgG1 concentration in colostrum from any one quarter would not be reliable. It is concluded that colostrum quality

  16. Association between IgG4-related disease and progressively transformed germinal centers of lymph nodes.

    Science.gov (United States)

    Sato, Yasuharu; Inoue, Dai; Asano, Naoko; Takata, Katsuyoshi; Asaoku, Hideki; Maeda, Yoshinobu; Morito, Toshiaki; Okumura, Hirokazu; Ishizawa, Shin; Matsui, Shoko; Miyazono, Takayoshi; Takeuchi, Tamotsu; Kuroda, Naoto; Orita, Yorihisa; Takagawa, Kiyoshi; Kojima, Masaru; Yoshino, Tadashi

    2012-07-01

    Progressively transformed germinal centers is a benign condition of unknown pathogenesis characterized by a distinctive variant form of reactive follicular hyperplasia in lymph nodes. We recently reported Ig G4-related disease in progressively transformed germinal centers. However, no large case series has been reported and clinicopathologic findings remain unclear. Here, we report 40 Japanese patients (28 men, 12 women; median age, 56 years) with progressively transformed germinal centers of the lymph nodes who fulfilled the histological diagnostic criteria for IgG4-related disease (IgG4(+) progressively transformed germinal centers), with asymptomatic localized lymphadenopathy involving the submandibular nodes in 24, submandibular and cervical nodes in 14, cervical nodes only in 1, and cervical and supraclavicular nodes in 1. In all, 16 (52%) of 31 examined patients had allergic disease. Histologically, the lymph nodes demonstrated uniform histological findings, namely marked follicular hyperplasia with progressively transformed germinal centers, and localization of the majority of IgG4(+) plasma cells in the germinal centers. Serum IgG4, serum IgE and peripheral blood eosinophils were elevated in 87%, 92% and 53% of examined patients, respectively. Eighteen patients subsequently developed extranodal lesions (including five who developed systemic disease), which on histological examination were consistent with IgG4-related disease. IgG4(+) progressively transformed germinal centers presents with uniform clinicopathological features of asymptomatic localized submandibular lymphadenopathy, which persists and/or relapses, and sometimes progresses to extranodal lesions or systemic disease. Nine patients were administered steroid therapy when the lesions progressed, to which all responded well. We suggest that IgG4(+) progressively transformed germinal centers should be included in the IgG4-related disease spectrum.

  17. Idiopathic granulomatous orchitis: morphology and evaluation of its relationship to IgG4 related disease.

    Science.gov (United States)

    Karram, Sarah; Kao, Chia-Sui; Osunkoya, Adeboye O; Ulbright, Thomas M; Epstein, Jonathan I

    2014-04-01

    Idiopathic granulomatous orchitis (IGO) is rare, thought to result from an autoimmune reaction to spermatogenic elements. Its relationship to IgG4-related disease (IgG4-RD) has not been evaluated. Sixteen orchiectomy specimens (1984-2012) with a prominent intratubular granulomatous reaction were reviewed: IGO (n = 6); intratubular germ cell neoplasia unclassified (IGCNU) with a granulomatous reaction and associated seminoma (GS, n = 6); and unclassified intratubular granulomatous orchitis not fitting into a specific entity (UGO, n = 4). Men with IGO were 32 to 86 years old, presenting with a mass suspicious for malignancy. Only one patient had a history of an inflammatory disease. Clinical follow-up was available for 2 patients with IGO, and both had no evidence of systemic IgG4-RD. All IGO cases had an epithelioid granulomatous reaction confined to seminiferous tubules, an extensive interstitial lymphoplasmacytic inflammation, 3 of 6 had prominent interstitial fibrosis, and 3 of 6 cases had plasma cells with an IgG4+/IgG+ ratio >40%. In GS, 10% to 100% of tubules with IGCNU had a granulomatous reaction, which in 3 cases replaced IGCNU cells. In contrast to IGO, GS had more intratubular multinucleated giant cells, more peritubular sclerosis, fewer interstitial plasma cells, and no interstitial fibrosis. Of the 4 UGO cases, most had predominantly interstitial with less intratubular granulomatous inflammation. Only 1 non-IGO case had elevated tissue IgG4 (GS case). It is critical and sometimes difficult to distinguish GS from IGO. IGO shares some features with IgG4-RD, yet current evidence does not support its classification as a localized manifestation of IgG4-RD occurring in the testis.

  18. A study on indirect radiolabeling of IgG with carrier free 188Re

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    188Re labeled monoclonal antibodies are potential candidates for use in radioimmunotherapy. S-Bz-MAG3 as a bifunctional chelating agent was used for labeling of IgG with carrier free 188Re by pre-radiolabeling of the chelating approach. The conjugation conditions were optimized. The stability of 188Re-MAG3-IgG in vitro was high. The results may be useful to the studies of 188Re labeled MAbs for radioimmunotherapy.

  19. Oxidative Stress and IgG Antibody Modify Periodontitis-CRP Association.

    Science.gov (United States)

    Singer, R E; Moss, K; Kim, S J; Beck, J D; Offenbacher, S

    2015-12-01

    In a previous report, we demonstrated the inverse association of high serum 8-isoprostane levels, a marker for oxidative stress, with decreased serum IgG antibodies to oral bacteria. The association between increased serum IgG with increased plaque and periodontitis (increased probing depths) was attenuated by high systemic oxidative stress. Other investigations have reported a role for systemic oxidative stress as a stimulus of hepatic C-reactive protein (CRP) response. These observations led us to hypothesize that the reported relationship of periodontitis to elevated serum CRP, a systemic inflammatory marker, may be modified by oxidative stress and that the levels of serum antibodies to oral bacteria might be an intermediary explanatory variable linking the association of systemic oxidative stress, periodontal disease, and levels of CRP. This hypothesis was explored as a secondary analysis of the Dental ARIC (Atherosclerosis Risk in Communities) study using serum levels of CRP, serum IgG levels to 16 oral organisms, serum levels of 8-isoprostane, and periodontal status. The findings indicate periodontitis is associated with high CRP in the presence of elevated oxidative stress that serves to suppress the IgG response. Only within the highest 8-isoprostane quartile was periodontitis (pocket depth) associated with increased serum CRP levels (P = 0.0003). Increased serum IgG antibody levels to oral bacteria were associated with lowered serum CRP levels. Thus, systemic oxidative stress, which has been demonstrated to be associated with increased levels of CRP in other studies, appears to be associated with the suppression of bacterial-specific IgG levels, which in the presence of periodontal disease can result in an enhanced systemic CRP response. Conversely, individuals with increased serum IgG antibodies to plaque bacteria exhibit lowered serum CRP levels. These 2 factors, oxidative stress and the serum IgG response, appear to function in opposing directions to

  20. IgG4-related disease and other causes of inflammatory meningeal disease.

    Science.gov (United States)

    Carruthers, Robert; Carruthers, Mollie; Della-Torre, Emanuel

    2014-09-01

    Immunoglobulin-4 (IgG4-) related disease is a newly described treatable condition that has recently expanded the differential diagnosis of inflammatory meningeal disorders. This review will discuss the main clinical and pathophysiological features of IgG4-related meningeal disease in the context of meningeal inflammatory disorders in general. Particular attention will be dedicated to the differential diagnosis and the different therapeutic approaches.

  1. Evaluación de pruebas de elisa e inmunofluorescencia indirecta para la detección de anticuerpos IgM contra rickettsiosis

    Directory of Open Access Journals (Sweden)

    Elizabeth Anaya

    2008-07-01

    Full Text Available Se evaluó dos pruebas modificadas de ELISA e inmunofluorescencia indirecta (IFI para la detección de IgM basadas en el lisado total de Rickettsia akari para el diagnóstico de Rickettsiosis. Se usaron 55 sueros negativos, 100 sueros positivos confirmados por IFI IgG Total y 15 sueros con diagnóstico confirmado para otras enfermedades bacterianas procedentes de la seroteca del Instituto Nacional de Salud. La prueba de ELISA IgM tuvo una sensibilidad de 78,0%, especificidad de 80,0%, valor predictivo positivo de 87,6% y el valor predictivo negativo de 66,7%, con una reacción cruzada con otras etiologías bacterianas de 20% (3/15. La prueba de IFI IgM tuvo una sensibilidad de 82,0%, especificidad de 91,7%, valor predictivo positivo de 94,3% y valor predictivo negativo de 75,3%, con una reacción cruzada de 13% (2/15. El método ELISA IgM no es una prueba útil, a diferencia de la prueba IFI IgM que podría ser aplicada en el diagnóstico de Rickettsiosis para estudios epidemiológicos y de vigilancia en el Perú.

  2. Acute tubulointerstitial nephritis with severe renal impairment associated with multisystem IgG4-related disease

    Directory of Open Access Journals (Sweden)

    Rafael Coimbra Ferreira Beltrame

    Full Text Available Abstract The IgG4-related disease has a wide clinical spectrum where multiple organs can be affected, and the diagnosis depends on typical histopathological findings and an elevated IgG4 expression in plasma cells in the affected tissue. We describe the clinical presentation and evolution of a patient with acute tubulointerstitial nephritis, severe kidney failure and systemic manifestations such as lymphadenomegaly and chronic pancreatitis. The diagnosis was confirmed by the clinical picture and kidney and lymph node histopathology, in which immunohistochemistry of the lymphoid tissue showed policlonality and increased expression of IgG4, with a IgG4/total IgG ratio > 80%. The patient was treated with prednisone at a dose of 60 mg/day, followed by mycophenolate mofetil, and showed clinical and renal function improvement at 6 months of follow-up. The high index of suspicion of IgG4-related disease with multisystem involvement and the early treatment of this condition are essential to improve the prognosis of affected patients.

  3. Utility of FDG PET/CT in IgG4-related systemic disease

    Energy Technology Data Exchange (ETDEWEB)

    Nakatani, K., E-mail: koyakn@kuhp.kyoto-u.ac.jp [Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, Sakyo-ku, Kyoto (Japan); Nakamoto, Y.; Togashi, K. [Department of Diagnostic Imaging and Nuclear Medicine, Kyoto University Graduate School of Medicine, Sakyo-ku, Kyoto (Japan)

    2012-04-15

    IgG4-related systemic disease (IgG4-RSD) is an emerging clinical entity about which much remains to be elucidated, in terms of its aetiology, pathogenesis, diagnosis, treatment and outcome. Autoimmune pancreatitis (AIP) and Mikulicz disease (MD) are the two major, well-studied constituents of IgG4-RSD. AIP and MD have common characteristics of forming tumour-mimicking lesions that consist of lymphoplasmacytic infiltrates and fibrosclerosis with numerous immunoglobulin G4 (IgG4)-positive plasma cells, as well as various multi-organ manifestations of IgG4-RSD. 2-[{sup 18}F]-fluoro-2-deoxy-D-glucose positron-emission tomography/ computed tomography (FDG PET/CT) enables the acquisition of whole-body images and provides functional information about disease activity; as such it has a valuable role in staging extent of disease, guiding biopsy, and monitoring response to treatment. However, FDG PET/CT is likely to be only one component of the management strategy, and clinical, laboratory, imaging and histological findings are crucial in the overall diagnosis of the condition. At present FDG PET/CT does not have a well-established role in the assessment of patients with IgG4-RSD and future prospective studies are required to define the cost-effectiveness and clinical impact in this patient group more accurately.

  4. THE EFFECT OF SLEEP DEPRIVATION ON SERUM IGG RESPONSES TO AEROBIC ACTIVITY IN COLLEGE STUDENT ATHLETES

    Directory of Open Access Journals (Sweden)

    Saeed Jamshidi Far

    2014-11-01

    Full Text Available Background & Aims: Sleep is a restorative process for the immune system. There are many situations in which sleep is disturbed prior to an athletic event. However, the effect of sleep deprivation on immune indices in response to exercise remains unknown. The aim of this study was to investigate the effects of sleep deprivation on serum IgG responses to aerobic activity. Materials & Methods: In this quasi-experimental study, 10 male physical education students were voluntarily participated. Study was performed in two separate occasions; control and experimental within two weeks. In the control occasion, normal sleep and aerobic activity and in the experimental occasion, sleep deprivation and aerobic activity was applied. Aerobic activity was performed on bicycle ergometer for 30 minutes at intensity of 70 to 75 percent of maximum heart rate. Changes in serum IgG concentrations in pre-test, before and after aerobic activity in both occasions were analyzed by the two repeated measures ANOVA and dependent T-test using SPSS software. Results: The results showed that sleep deprivation not significantly effect on Serum IgG response to aerobic activity (p=0.130. Also, aerobic activity not significantly effect on Serum IgG concentration (p=0.357. But sleep deprivation caused a significantly increase in serum IgG concentration (p=0.035. Conclusion: No significant effect of sleep deprivation on serum IgG concentrations response to aerobic activity.

  5. Colovesical fistula caused by glucocorticoid therapy for IgG4-related intrapelvic mass.

    Science.gov (United States)

    Yabuuchi, Yohei; Matsubayashi, Hiroyuki; Matsuzaki, Masato; Shiomi, Akio; Moriguchi, Michihisa; Kawamura, Ichiro; Ito, Ichiro; Ono, Hiroyuki

    2015-12-16

    IgG4-related disease (IgG4-RD) is an immune-mediated fibroinflammatory disorder that can occur in almost all systemic organs and generally responds to corticosteroid treatment. We report a rare case of an IgG4-related intrapelvic mass lesion that responded to steroid therapy but caused a fistula between the sigmoid colon and bladder. A 71-year-old man was followed after treatment for hepatocellular carcinoma. Follow-up computed tomography (CT) incidentally depicted left hydronephrosis with an ill-demarcated intrapelvic mass lesion. This lesion was histologically diagnosed as IgG4-RD by open biopsy, and peroral steroid therapy was initiated. One month after starting steroids, a colovesical fistula was detected by follow-up CT. A colostomy and urethral catheterization were emergently performed. The patient recovered and the mass lesion was drastically minimized by the initiation of glucocorticoids; however, he still needs urethral catheterization. IgG4-RD develops in various systemic organs and generally responds well to steroids. Clinicians must be watchful for the complications of responses to corticosteroids, such as fistulization, when the mass lesion of IgG4-RD is adjacent to multiple luminal organs.

  6. [IgG4-related kidney disease: what the nephrologist needs to know].

    Science.gov (United States)

    Galeano, Dario; Zanoli, Luca; Scarfia, Viviana Rosalia; L'Imperio, Vincenzo; Malatino, Lorenzo; Fatuzzo, Pasquale; Granata, Antonio

    2016-01-01

    IgG4 related disease is a systemic fibro-inflammatory disorder characterized by multiple organ and multiple tissue lesions. The real pathogenesis is currentlyactually unknown. For these reasons many authors compare IgG4 related disease to sarcoidosis. Lesions are often localized in the pancreas, salivary and lacrimal glands, biliary ducts, retroperitoneum and in many other organs. The diagnosisis difficult because of mild symptoms and the possibility of mimicking other severe diseases. Therefore, histopathology together with clinical and radiological typical findings are mandatory tools for diagnosis. Steroidtherapy usually enables disappearance of tumor like lesions and complete recovery. Kidney has an extensive organ involvement in the contextof IgG4-related disease. Historically, tubule - interstitial nephritis(TIN) is considered the main renal feature of renal lesions, however recent studies extend the spectrum of renal lesions also to glomerular tuft. These findings allow to introduce in the nosography the term of IgG4related kidney disease (IgG4 RKD). This review focuses on renal involvement in IgG4related disease, in order to help nephrologists to improve their clinical, diagnostic and therapeutic approach to this emerging pleiotropic clinical pattern.

  7. Neuromyelitis optica IgG stimulates an immunological response in rat astrocyte cultures

    Institute of Scientific and Technical Information of China (English)

    Howe CL; Kaptzan T; Magaa SM; Ayers-Ringler JR; LaFrance-Corey RG; Lucchinetti CF

    2014-01-01

    Neuromyelitis optica (NMO) is a primary astrocyte disease associated with central nervous system inflammation, demyelination, and tissue injury. Brain lesions are frequently observed in regions enriched in expression of the aquaporin-4 (AQP4) water channel, an antigenic target of the NMO IgG serologic marker. Based on observations of disease reversibility and careful characterization of NMO lesion development, we propose that the NMO IgG may induce a dynamic immunological response in astrocytes. Using primary rat astrocyte-enriched cultures and treatment with NMO patient-derived serum or purified IgG, we observed a robust pattern of gene expression changes consistent with the induction of a reactive and inflammatory phenotype in astrocytes. The reactive astrocyte factor lipocalin-2 and a broad spectrum of chemokines, cytokines, and stress response factors were induced by either NMO patient serum or purified IgG. Treatment with IgG from healthy controls had no effect. The effect is disease-specific, as serum from patients with relapsing-remitting multiple sclerosis, Sj gren's, or systemic lupus erythematosus did not induce a response in the cultures. We hypothesize that binding of the NMO IgG to AQP4 induces a cellular response that results in transcriptional and translational events within the astrocyte that are consistent with a reactive and inflammatory phenotype. Strategies aimed at reducing the inflammatory response of astrocytes may short circuit an amplification loop associated with NMO lesion development.

  8. Recent advances in the concept and diagnosis of autoimmune pancreatitis and IgG4-related disease.

    Science.gov (United States)

    Okazaki, Kazuichi; Uchida, Kazushige; Koyabu, Masanori; Miyoshi, Hideaki; Takaoka, Makoto

    2011-03-01

    Recent studies have suggested the existence of two subtypes of autoimmune pancreatitis (AIP): type 1 AIP, related to IgG4 (lymphoplasmacytic sclerosing pancreatitis); and type 2 AIP, related to a granulocytic epithelial lesion (idiopathic duct-centric chronic pancreatitis). Compared with type 2 AIP, the clinicopathological features of type 1 AIP, with increased serum IgG4/IgE levels, abundant infiltration of IgG4 + plasmacytes and lymphocytes, autoantibodies, and steroid responsiveness, are more suggestive of abnormal immunity such as allergy or autoimmunity. Moreover, patients with type 1 AIP often have extrapancreatic lesions, such as sclerosing cholangitis, sclerosing sialadenitis, or retroperitoneal fibrosis, showing pathological features similar to those of the pancreatic lesions. Based on these findings, an international concept of and diagnostic criteria for AIP have been proposed recently. Of interest, many synonyms have been proposed for the conditions of AIP and extrapancreatic lesions associated with IgG4, such as "multifocal idiopathic fibrosclerosis," "IgG4-related autoimmune disease," "IgG4-related sclerosing disease," "systemic IgG4-related plasmacytic syndrome (SIPS)," and "IgG4-related multiorgan lymphoproliferative syndrome," all of which may refer to the same conditions. Therefore, the Japanese Research Committee for "Systemic IgG4-Related Sclerosing Disease" proposed a disease concept and clinical diagnostic criteria based on the concept of multifocal fibrosclerosing disease, in 2009, in which the term "IgG4-related disease" was agreed upon as a minimal consensus to cover these conditions. Although the significance of IgG4 in the development of "IgG4-related disease" remains unclear, we have proposed a hypothesis for the development of type 1 AIP, one of the IgG4-related diseases. The concept and diagnostic criteria of "IgG4-related disease" will be changed in accordance with future studies.

  9. Antiradiation Antitoxin IgG : Immunological neutralization of Radiation Toxins at Acute Radiation Syndromes.

    Science.gov (United States)

    Popov, Dmitri; Maliev, Slava

    Introduction: High doses of radiation induce apoptotic necrosis of radio-sensitive cells. Mild doses of radiation induce apoptosis or controlled programmed death of radio-sensitive cells with-out development of inflammation and formation of Radiation Toxins. Cell apoptotic necrosis initiates Radiation Toxins (RT)formation. Radiation Toxins play an important role as a trig-ger mechanism for inflammation development and cell lysis. If an immunotherapy approach to treatment of the acute radiation syndromes (ARS) were to be developed, a consideration could be given to neutralization of radiation toxins (Specific Radiation Determinants-SRD) by specific antiradiation antibodies. Therapeutic neutralization effects of the blocking anti-radiation antibodies on the circulated RT had been studied. Radiation Toxins were isolated from the central lymph of irradiated animals with Cerebrovascular(Cv ARS),Cardiovascular (Cr ARS),Gastrointestinal(Gi ARS) and Haemopoietic (Hp ARS) forms of ARS. To accomplish this objective, irradiated animals were injected with a preparation of anti-radiation immunoglobulin G (IgG) obtained from hyperimmune donors. Radiation-induced toxins that we call Specific Radiation Determinants (SRD) possess toxic (neurotoxic, haemotoxic) characteristics as well as specific antigenic properties. Depending on direct physiochemical radiation damage, they can induce development of many of the pathological processes associated with ARS. We have tested several specific hyperimmune IgG preparations against these radiation toxins and ob-served that their toxic properties were neutralized by the specific antiradiation IgGs. Material and Methods: A scheme of experiments was following: 1.Isolation of radiation toxins (RT) from the central lymph of irradiated animals with different form of ARS. 2.Transformation of a toxic form of the RT to a toxoid form of the RT. 3.Immunization of radiation naive animals. Four groups of rabbits were inoculated with a toxoid form of SRD

  10. IgG2 immunodeficiency: association to pediatric patients with bacterial meningoencephalitis Inmunodeficiencia de IgG2: asociación en pacientes pediátricos con meningoencefalitis bacterianas

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    XIOMARA ESCOBAR-PÉREZ

    2000-03-01

    Full Text Available An IgG subclass deficiency is often associated with bacterial infections. We studied four pediatric patients suffering from meningoencephalitis, two of them due to Streptococcus pneumoniae and two due to Haemophilus influenzae type b. Simultaneous diagnostic serum and cerebrospinal fluid samples were taken during income. The four subclasses of IgG and albumin were quantified in both biologic fluids by radial immunodiffusion. Very low levels of seric IgG2 with non detectable cerebrospinal fluid IgG2 were found in the patients. No intrathecal IgG subclass synthesis was found in two patients. One patient with S. pneumoniae had IgG3 intrathecal synthesis. Intrathecal IgG1, IgG3 and IgG4 synthesis was found in one patient suffering from H. influenzae according with reibergrams. Substitutive therapy with intravenous gammaglobulin was given to the patients as part of the treatment.Las deficiencias por subclases de IgG se asocian frecuentemente con infecciones de origen bacteriano. Se estudian cuatro pacientes en edad pediátrica con meningoencefalitis, dos de ellos a Streptococcus pneumoniae y dos a Haemophilus influenzae tipo b. Se toman muestras simultáneas diagnósticas de suero y líquido cefalorraquídeo en el momento del ingreso. Se cuantificaron las cuatro sublclases de IgG y albúmina en ambos líquidos biológicos por inmunodifusión radial. Se encontró que los pacientes presentaban cifras muy disminuidas de IgG2 sérico y ningun exhibia IgG2 en el líquido cefalorraquídeo. Dos pacientes no sintetizaron ninguna subclase de IgG intratecalmente. Un paciente con S. pneumoniae sintetizó IgG3 intratecal. Uno de los pacientes con meningoencefalitis a H. influenzae sintetizó IgG1, IgG3 e IgG4 intratecalmente de acuerdo com el reibergrama. Estos pacientes recibieron terapia substitutiva com gammaglobulina intravenosa como parte de la medicación.

  11. Non-apical membrane antigen 1 (AMA1 IgGs from Malian children interfere with functional activity of AMA1 IgGs as judged by growth inhibition assay.

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    Kazutoyo Miura

    Full Text Available BACKGROUND: Apical membrane antigen 1 (AMA1 is one of the best-studied blood-stage malaria vaccine candidates. When an AMA1 vaccine was tested in a malaria naïve population, it induced functionally active antibodies judged by Growth Inhibition Assay (GIA. However, the same vaccine failed to induce higher growth-inhibitory activity in adults living in a malaria endemic area. Vaccination did induce functionally active antibodies in malaria-exposed children with less than 20% inhibition in GIA at baseline, but not in children with more than that level of baseline inhibition. METHODS: Total IgGs were purified from plasmas collected from the pediatric trial before and after immunization and pools of total IgGs were made. Another set of total IgGs was purified from U.S. adults immunized with AMA1 (US-total IgG. From these total IgGs, AMA1-specific and non-AMA1 IgGs were affinity purified and the functional activity of these IgGs was evaluated by GIA. Competition ELISA was performed with the U.S.-total IgG and non-AMA1 IgGs from malaria-exposed children. RESULTS: AMA1-specific IgGs from malaria-exposed children and U.S. vaccinees showed similar growth-inhibitory activity at the same concentrations. When mixed with U.S.-total IgG, non-AMA1 IgGs from children showed an interference effect in GIA. Interestingly, the interference effect was higher with non-AMA1 IgGs from higher titer pools. The non-AMA1 IgGs did not compete with anti-AMA1 antibody in U.S.-total IgG in the competition ELISA. CONCLUSION: Children living in a malaria endemic area have a fraction of IgGs that interferes with the biological activity of anti-AMA1 antibody as judged by GIA. While the mechanism of interference is not resolved in this study, these results suggest it is not caused by direct competition between non-AMA1 IgG and AMA1 protein. This study indicates that anti-malaria IgGs induced by natural exposure may interfere with the biological effect of antibody induced by an AMA1

  12. Clinical fluctuations in MuSK myasthenia gravis are related to antigen-specific IgG4 instead of IgG1

    NARCIS (Netherlands)

    Niks, E H; van Leeuwen, Y; Leite, M I; Dekker, F W; Wintzen, A R; Wirtz, P W; Vincent, A; van Tol, M J D; Jol-van der Zijde, C M; Verschuuren, J J G M

    2008-01-01

    We studied the longitudinal relation between disease severity and titers of antigen-specific IgG subclasses in sera of patients with myasthenia gravis and antibodies to Muscle Specific Kinase (MuSK MG). Six patients were included of whom 55 samples had been collected during 2.5-13.4 years. Anti-MuSK

  13. IgG4相关性疾病的发病机制及进展%Progress in pathogenesis of IgG4-related disease

    Institute of Scientific and Technical Information of China (English)

    苏玉莹; 王晨琼; 董凌莉

    2014-01-01

    IgG4-related disease, a newly recognized systemic entity, is characterized by elevated serum levels of IgG4 and a dense lymphoplasmacytic infiltrate rich in IgG4-positive plasma cells in involved tissues. Its complicated clinical manifestation and multidiscipline involvement make it easy to be misdiagnosed or miss diagnosed. In order to better understand this disease, this review elaborated on update in pathogenesis of IgG4-related disease including genetics, infection and molecular mimicry, immunology and so on.%IgG4相关性疾病是一种多器官、多系统受累的新被认识的疾病,其主要特征为:血清IgG4水平升高和病变组织IgG4+浆细胞浸润。IgG4相关性疾病临床表现复杂多样,可涉及多个学科,临床易漏诊和误诊。本篇综述将从基因遗传、感染和分子模拟、免疫学角度等多方面阐述IgG4相关性疾病的发病机制,以加深临床医师对该病的了解。

  14. PREDOMINANCE OF IGG1 AND IGG4 SUBCLASSES OF ANTINEUTROPHIL CYTOPLASMIC AUTOANTIBODIES (ANCA) IN PATIENTS WITH WEGENERS GRANULOMATOSIS AND CLINICALLY RELATED DISORDERS

    NARCIS (Netherlands)

    BROUWER, E.; Tervaert, J.W.C.; HUITEMA, M.G.; VANDERGIESSEN, M.; Limburg, Piet; Kallenberg, Cees; Horst, G.

    1991-01-01

    In view of the supposed hypersensitivity, the elevated levels of IgE, and the occurrence of eosinophilia reported in Wegener's granulomatosis and related conditions, we studied the IgG subclass distribution of ANCA directed against a 29-kD serine protease and and myeloperoxidase (MPO) in 41 untreate

  15. Novel human IgG1 and IgG4 Fc-engineered antibodies with completely abolished immune effector functions.

    Science.gov (United States)

    Schlothauer, Tilman; Herter, Sylvia; Koller, Claudia Ferrara; Grau-Richards, Sandra; Steinhart, Virginie; Spick, Christian; Kubbies, Manfred; Klein, Christian; Umaña, Pablo; Mössner, Ekkehard

    2016-10-01

    Recombinant human IgG antibodies (hIgGs) completely devoid of binding to Fcγ receptors (FcγRs) and complement protein C1q, and thus with abolished immune effector functions, are of use for various therapeutic applications in order to reduce FcγR activation and Fc-mediated toxicity. Fc engineering approaches described to date only partially achieve this goal or employ a large number of mutations, which may increase the risk of anti-drug antibody generation. We describe here two new, engineered hIgG Fc domains, hIgG1-P329G LALA and hIgG4-P329G SPLE, with completely abolished FcγR and C1q interactions, containing a limited number of mutations and with unaffected FcRn interactions and Fc stability. Both 'effector-silent' Fc variants are based on a novel Fc mutation, P329G that disrupts the formation of a proline sandwich motif with the FcγRs. As this motif is present in the interface of all IgG Fc/FcγR complexes, its disruption can be applied to all human and most of the other mammalian IgG subclasses in order to create effector silent IgG molecules.

  16. OBTENCIÓN DE ANTICUERPOS ESPECÍFICOS PARA LA DETECCIÓN DEL Tamarillo leaf malformation virus (TALMV EN TOMATE DE ÁRBOL Specific Antibodies to Detect Tamarillo leaf malformation virus (TaLMV in Tamarillo

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    YULIANA GALLO GARCÍA

    2011-08-01

    Full Text Available En Colombia el rendimiento del cultivo de tomate de árbol se ha visto seriamente afectado por la expansión de una enfermedad conocida como virosis de tomate de árbol. Esta patología se registró inicialmente en 1991 en el norte de Antioquia y su expansión ha alcanzado todas las regiones cultivadoras de este frutal en el país. Trabajos recientes han detectado la presencia de por lo menos dos especies del género Potyvirus (Potyviridae asociadas a esta enfermedad en los cultivos de tomate de árbol de Antioquia: Potato virus Y (PVY y Tamarillo leaf malformation virus (TaLMV, especie propuesta. Con el fin de reducir la diseminación de estos patógenos virales en el país, es necesario contar con herramientas de diagnóstico que permitan la certificación del material de siembra y la detección temprana en plantas asintomáticas. En este trabajo se obtuvieron anticuerpos policlonales específicos para la detección del virus TaLMV utilizando una región antigénica de 15 residuos de la cápside viral. La sensibilidad y especificidad de los anticuerpos anti-TaLMV fue evaluada mediante pruebas de ELISA y dot-blot utilizando proteína recombinante y péptidos sintéticos como controles. La utilidad de estos anticuerpos fue validada a partir de una prueba piloto de detección de TaLMV en muestras de plantas de tomate de árbol con y sin síntomas de virosis obtenidas en el oriente antioqueño. Los resultados serológicos fueron comparados con los niveles de detección que ofrece la técnica de RT-PCR con cebadores específicos para la cápside viral de TaLMV.In Colombia, yields of tamarillo are seriously affected by a complex viral disease known as virosis. This pathology was first reported in 1991 in the north of Antioquia and currently affects all tamarillo growing regions in the country. Recent works have demonstrated the association of two potyviruses (potyviridae with this disease: Potato virus Y (PVY and Tamarillo leaf malformation virus

  17. Unusual IgG4-related hypophysitis: one case report and analysis of clinicopathological characteristics

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    Zhen-qi LI

    2014-10-01

    Full Text Available Background Immunoglobulin G4 (IgG4-related disease is a recently characterized autoimmune disease entity marked by elevated serum IgG4 levels and tissue infiltration by IgG4-positive plasma cells in multiple involved organs. Hypophysitis is a rare inflammatory disorder and IgG4-related sclerosing disease involving the ituitary alone is especially rare. Imaging studies may reveal a mass lesion in the sellar area or a thickening of pituitary stalk, mimicking a pituitary tumor. Due to its rarity and non-specific appearance in radiological examination, it is a diagnostic challenge for clinicians and histopathologists to differentiate solitary IgG4-related hypophysitis from other pituitary lesions. The aim of this study is to summarize the clinicopathological features of unusual IgG4-related hypophysitis and discuss the differential diagnosis of histologically similar inflammatory lesions in pituitary. Methods The clinical manifestation of a patient with solitary IgG4-related hypophysitis was presented retrospectively. Resected mass was routinely paraffin-embedded and stained with Hematoxylin and Eosin. Dako EnVision immunohistochemical staining system was used to detect the tumor antigen expressions, including vimentin (Vim, S-100 protein (S-100, pan cytokeratin (PCK, epithelial membrane antigen (EMA, CD3, CD20, CD68, CD1a, κ-light chain, λ-light chain and progestrone receptor (PR.  Results A 47-year-old male patient presented with 1-year history of mild limb weakness and hyposexuality. Laboratory examination revealed hypopituitarism with low levels of serum testosterone, cortisol, luteinizing hormone (LH and follicle stimulating hormone (FSH, although his serum IgG4 level was high. MRI of the pituitary gland revealed a mass lesion in the sellar area with T1WI mild hyperintense and homogeneous enhancement after gadolinium administration. The patient underwent a transsphenoidal mass resection of the pituitary gland. Histological examination

  18. Differential evolution of anti-VAR2CSA- IgG3 in primigravidae and multigravidae pregnant women infected by Plasmodium falciparum

    DEFF Research Database (Denmark)

    Guitard, Juliette; Cottrell, Gilles; Magnouha, Nellie Moulopo;

    2008-01-01

    BACKGROUND: Pregnant women develop protective anti-VSA IgG1 and IgG3 when infected by Plasmodium falciparum. The major target of IgG from serum of infected pregnant women is VAR2CSA. METHODS: In this study, ELISA was used to compare the level of VAR2CSA DBL5epsilon- specific IgG subclasses...

  19. IgG4-Related Disease Is Not Associated with Antibody to the Phospholipase A2 Receptor

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    Arezou Khosroshahi

    2012-01-01

    Full Text Available Patients with IgG4-related disease (IgG4-RD share histopathological characteristics that are similar across affected organs. The finding of infiltration with IgG4+ plasma cells in the proper clinical and histopathological contexts connects a large number of clinical entities that were viewed previously as separate conditions. The renal involvement in IgG4-RD is usually characterized by tubulointerstitial nephritis, but membranous nephropathy has also been reported to be one of the renal complications of IgG4-RD. The recent discovery that a high proportion of patients with idiopathic membranous nephropathy (IMN have IgG4 autoantibodies to the M-type phospholipase A2 receptor (PLA2R in the circulation and glomerular immune deposits, together with the profound IgG4 hypergammaglobulinemia and occasional reports of membranous nephropathy in IgG4-RD, raised the question of a common antigen. To assess the presence of anti-PLA2R antibody in patients with IgG4-RD, we screened sera from 28 IgG4-RD patients by immunoblot. None of the patients in this cohort had detectable circulating anti-PLA2R antibodies. This study suggests that despite some clinical and serological overlaps between IgG4-RD and IMN,anti-PLA2R antibodies do not play a role in the pathogenesis of IgG4-RD. Additional studies of IgG4-RD with evidence of membranous nephropathy are important to exclude any definite relationship.

  20. Human placenta: relative content of antibodies of different classes and subclasses (IgG1-IgG4) containing lambda- and kappa-light chains and chimeric lambda-kappa-immunoglobulins.

    Science.gov (United States)

    Lekchnov, Evgenii A; Sedykh, Sergey E; Dmitrenok, Pavel S; Buneva, Valentina N; Nevinsky, Georgy A

    2015-06-01

    The specific organ placenta is much more than a filter: it is an organ that protects, feeds and regulates the growth of the embryo. Affinity chromatography, ELISA, SDS-PAGE and matrix-assisted laser desorption ionization mass spectrometry were used. Using 10 intact human placentas deprived of blood, a quantitative analysis of average relative content [% of total immunoglobulins (Igs)] was carried out for the first time: (92.7), IgA (2.4), IgM (2.5), kappa-antibodies (51.4), lambda-antibodies (48.6), IgG1 (47.0), IgG2 (39.5), IgG3 (8.8) and IgG4 (4.3). It was shown for the first time that placenta contains sIgA (2.5%). In the classic paradigm, Igs represent products of clonal B-cell populations, each producing antibodies recognizing a single antigen. There is a common belief that IgGs in mammalian biological fluids are monovalent molecules having stable structures and two identical antigen-binding sites. However, similarly to human milk Igs, placenta antibodies undergo extensive half-molecule exchange and the IgG pool consists of 43.5 ± 15.0% kappa-kappa-IgGs and 41.6 ± 17.0% lambda-lambda-IgGs, while 15.0 ± 4.0% of the IgGs contained both kappa- and lambda-light chains. Kappa-kappa-IgGs and lambda-lambda-IgGs contained, respectively (%): IgG1 (47.7 and 34.4), IgG2 (36.3 and 44.5), IgG3 (7.4 and 11.8) and IgG4 (7.5 and 9.1), while chimeric kappa-lambda-IgGs consisted of (%): 43.5 IgG1, 41.0 IgG2, 5.6 IgG3 and 7.9 IgG4. Our data are indicative of the possibility of half-molecule exchange between placenta IgGs of various subclasses, raised against different antigens, which explains a very well-known polyspecificity and cross-reactivity of different human IgGs.

  1. Prohibitin Is Involved in Patients with IgG4 Related Disease.

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    Hongwu Du

    Full Text Available IgG4-related disease (IgG4-RD is a chronic systemic disease involved in many organs and tissues. As only limited autoantigens have been found since the beginning of this century, the aim of this study was to reveal new candidate autoantigens of IgG4-RD.Multiple cell lines including HT-29, EA.hy926, HEK 293 and HepG2 were used to test the binding ability of circulating autoantibodies from IgG4-RD sera. The amino-acid sequence was then analyzed by matrix-assisted laser desorption/ionization time-of-flight tandem (MALDI-TOF/TOF mass spectrometry. After the cloning and expression of recombinant putative autoantigen in a bacterial expression system, the corresponding immuno assay was set up and utilized to observe the prevalence of serum autoantibodies in a large set of confirmed clinical samples.One positive autoantigen was identified as prohibitin. ELISA analysis showed that a majority of patients with IgG4-RD have antibodies against prohibitin. Anti-prohibitin antibodies were present in the sera of patients with definite autoimmune pancreatitis (25/34; 73.5%, Mikulicz's disease (8/15; 53.3%, retroperitoneal fibrosis (6/11; 54.5%, other probable IgG4-RD (26/29; 89.7% and Sjögren's syndrome (4/30; 13.3% but not in apparently healthy donors (1/70; 1.4%.An association between prohibitin and patients with some IgG4-RD was observed, although the results were quite heterogeneous among different individuals within autoimmune pancreatitis, Mikulicz's disease and retroperitoneal fibrosis.

  2. IgG4-related disease: current challenges and future prospects

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    Lang D

    2016-02-01

    Full Text Available David Lang,1 Jochen Zwerina,2 Herwig Pieringer1,3 1Second Department of Internal Medicine, Kepler University Clinic, Linz, 2First Department of Internal Medicine, Ludwig Boltzmann-Institute of Osteology, Hanusch Hospital, Vienna, 3Paracelsus Private Medical University, Salzburg, Austria Abstract: Immunoglobulin G4-related disease (IgG4-RD represents an immune-mediated fibroinflammatory condition with a characteristic histopathological appearance that can affect various organs. Although numerous single-organ manifestations have been described more than a century ago, its systemic nature and unique features were only discovered in the last 2 decades, when IgG4-RD emerged as a new entity of disease. IgG4-RD is usually considered a rare disease, but its true epidemiology has not yet been fully clarified. Also, despite recent advances in the identification of the underlying immunological processes, its pathophysiology is only incompletely understood till now. The diagnostic workup of IgG4-RD is complex and usually requires a combination of clinical examination, imaging, histological, and serological analyses. However, no finding alone is specific for IgG4-RD. Therefore, its diagnosis requires careful interpretation of examination results in context with the patient’s clinical appearance as well as the exclusion of a broad variety of differential diagnoses. The past years brought rapid advances concerning this novel disease entity: diagnostic criteria, further insights into the underlying immunological processes, new biomarkers, and novel therapeutic approaches were proposed and widened the knowledge in the field of IgG4-RD. Still, a greater number of questions remain unanswered, and many recent developments require further discussion and proof from clinical trials. This review should give an overview on current knowledge and future perspectives in epidemiology, pathophysiology, diagnosis, and therapy of IgG4-RD. Keywords: PET/CT, autoimmune

  3. Effect of biotherapeutics on antitoxin IgG in experimentally induced Clostridium difficile infection

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    S Kaur

    2012-01-01

    Full Text Available Purpose: Recurrent diarrhoea after successful treatment of primary Clostridium difficile associated disease (CDAD occurs due to bowel flora alterations and failure to mount an effective antibody response. Apart from antibiotics, risk factors include immunosuppressive and acid-suppressive drug administration. Biotherapeutics such as probiotic and epidermal growth factor (EGF may offer potential effective therapy for CDAD. Materials and Methods: The effect of biotherapeutics in mounting an antibody response against C. difficile toxins was studied in BALB/c mice challenged with C. difficile after pre-treatment with ampicillin, lansoprazole or cyclosporin. Sera from sacrificed animals were estimated for antitoxin IgG by enzyme linked immunosorbent assay. Results: Antitoxin IgG was significantly higher (P0.05 in animals in which C. difficile was given after pre-treatment with cyclosporin compared to those without any pre-treatment, or pre-treatment with antibiotic or lansoprazole. In inter-subgroup comparisons also significant anomaly in production of antitoxin IgG was found. The antitoxin IgG levels were raised in animals administered C. difficile after pre-treatment with ampicillin, but lower in animals administered cyclosporin. High levels of antitoxin IgG were also found in the serum samples of animals receiving lansoprazole and C. difficile. Conclusions: Probiotics showed their beneficial effect by boosting the immune response as seen by production of antitoxin IgG. Oral administration of EGF did not affect the immune response to C. difficile toxins as significant increase was not observed in the serum antitoxin IgG levels in any of the groups investigated.

  4. Indeterminate/moderate IgG avidity during HCMV infection: comparison of methods

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    Massimo De Paschale

    2010-03-01

    Full Text Available Background. The IgG avidity test is usually used for differentiating between primary and non-primary HCMV infection within 3 months. Weak avidity is highly suggestive of a primary infection, while high avidity tends to exclude it.An indeterminate or moderate avidity, however, does not allow a clear dating. Since there are several avidity tests with different performances, those tests that are able to minimize the results with indeterminate/moderate avidity are particularly useful. Objectives. The aim of our work was to evaluate the results obtained with two IgG avidity tests in IgG and IgM anti-HCMV positive patients. Study Design. 113 anti-HCMV IgG and IgM positive samples were tested with Enzime Linked Fluorescent Assay (ELFA and Chemiluminescence Immuno Assay (CLIA IgG avidity test. Results. 21 samples (18.6%, 50 (44.2% and 42 (37.2% with ELFA and 53 samples (46.9%, 10 (8.8% and 50 (44.2% with CLIA were found to have respectively low, indeterminate/moderate and high avidity. Of the 50 ELFA indeterminate avidity samples, 32 (64%, 10 (20% and 8 (16% were found to have respectively low, moderate and high CLIA.avidity. For 11 cases of the 32 ELFA indeterminate avidity and CLIA low avidity, there were previous data showing a seroconversion within three months. In a case of the 8 ELFA indeterminate avidity and CLIA high avidity, there were, instead, previous data of IgG and IgM positivity already four months earlier. Conclusions. It appears that the CLIA test for IgG avidity is more effective than ELFA for dating HCMV infection.

  5. Overexpression of Serpinb1 in Chinese hamster ovary cells increases recombinant IgG productivity.

    Science.gov (United States)

    Lin, Nan; Brooks, Jeanne; Sealover, Natalie; George, Henry J; Kayser, Kevin J

    2015-01-10

    We report the discovery and validation of a novel CHO cell engineering target for improving IgG expression, serpin peptidase inhibitor, clade B, member 1 (Serpinb1). Transcriptomic studies using microarrays revealed that Serpinb1 was up-regulated in cultures with IgG heavy and light chain transcription transiently repressed compared with cultures treated with non-targeting siRNA. As proof of concept, a lentiviral vector was employed to overexpress the Chinese Hamster Serpinb1 in a CHOZN(®) Glutamine Synthetase (-/-) recombinant IgG producing CHO line. The lentiviral stable pool demonstrated 4.2-fold SERPINB1 overexpression compared with the non-transduced control. The peak viable cell density (VCD) and peak IgG volumetric productivity of the lentiviral stable pool increased 1.3 and 2.0 fold, respectively, compared with the non-transduced control. For host cell engineering, a plasmid encoding SERPINB1 was transfected into the CHOZN(®) GS (-/-) host cell line to create several stable pools. Single-cell clones isolated from the pools were characterized for their SERPINB1 expression levels and growth. The clone (SERPINB1_OE_27) with the highest SERPINB1 expression had decreased peak viable cell density and exponential phase growth rate. Selected SERPINB1 OE clones were subsequently evaluated for their IgG expression capabilities using GS selection. Clone SERPINB1_OE_42 with moderate SERPINB1 overexpression demonstrated increased IgG productivity in "bulk" selection. We conclude that manipulating Serpinb1 expression can lead to increased recombinant IgG productivity, but the effect in host cell lines may vary by clone and by overexpression level. This work represents the ongoing effort in applying "-omics" findings to novel CHO host cell line engineering.

  6. Efecto de la infección de Mycobacterium avium paratuberculosis en la producción de anticuerpos bovinos Effect of the infection with Mycobacterium avium paratuberculosis on the production of bovine antibodies

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    B Fernández

    2011-06-01

    Full Text Available La paratuberculosis es una enfermedad granulomatosa crónica intestinal, causada por Mycobacterium avium subespecie paratuberculosis, que afecta a los rumiantes. El objetivo del trabajo fue caracterizar la respuesta inmune humoral sistémica y local de bovinos infectados. Se estudiaron once bovinos, seis infectados (asintomáticos, sintomáticos y terminales y cinco controles. Se determinaron los niveles de inmunoglobulinas totales y se cuantificaron los subisotipos de IgG específicos a paratuberculosis en suero y materia fecal por ELISA. Los niveles de inmunoglobulinas totales en sueros fueron similares. Sin embargo, se evidenciaron aumentos significativos de IgM e IgG totales, e IgG-específica en materia fecal de los sintomáticos. La IgG1 específica fue predominante en sueros de bovinos sintomáticos y terminales. La IgG3 fue la inmunoglobulina específica de mayor cantidad detectada tanto en suero como en materia fecal de los asintomáticos. Nuestros resultados muestran que la infección no afecta la producción de inmunoglobulinas totales. El aumento de inmunoglobulinas en materia fecal podría relacionarse con la lesión de la mucosa intestinal. El predominio de IgG1 se corresponde con el cambio de perfil a Th2 en el periodo sintomático. El hallazgo de incrementos de IgG3 específica en asintomáticos sugiere el estudio de este isotipo para poder mejorar su identificación.Paratuberculosis, caused by Mycobacterium avium subspecies paratuberculosis, is a chronic granulomatous enteric disease affecting ruminants. Our aim was to characterize systemic and local humoral responses of infected cows. Eleven cows were studied: six naturally infected (asymptomatic, symptomatic and terminal and five control. Total IgM and IgG and paratuberculosis-specific IgG subisotypes, from feces and serum, were assessed by ELISA. No differences were detected on the levels of total immunoglobulins in sera. Symptomatic cows showed significative higher level of

  7. The role of IgG4 (+) plasma cells in the association of Hashimoto's thyroiditis with papillary carcinoma.

    Science.gov (United States)

    Taşli, Funda; Ozkök, Güliz; Argon, Asuman; Ersöz, Didem; Yağci, Ayşe; Uslu, Adam; Erkan, Nazif; Salman, Tarik; Vardar, Enver

    2014-12-01

    Hashimoto's thyroiditis (HT) is considered to be a risk factor for the formation of papillary carcinoma. The association of IgG4-related sclerosing disease with tumor is reported to be as sporadic cases in many organs. In this study, it was intended to re-classify the HT diagnosed cases on the basis of the existence of IgG4 (+) plasma cells; to investigate the clinicopathologic and histopathologic features of the both groups; and in addition, to evaluate the papillary carcinoma prevalence in IgG4 (+) and IgG4 (-) HT cases as well as the prognostic parameters between these groups. Totally 59 cases between the years 2008-2013, 29 of which contain Hashimoto thyroiditis diagnosis in total thyroidectomy materials, and 30 of which contain the diagnosis of HT+papillary carcinoma, were included in the study. The materials were immunohistochemically applied IgG and IgG4; and the cases were classified in two groups as IgG4-positive HT and IgG4-negative HT containing cases, on the basis of IgG4/IgG rate. All histopathologic and clinicopathologic parameters between these two groups, as well as their association with papillary carcinoma were investigated. Thirty eight (64.4%) of total 59 cases were NonIgG4 thyroiditis, and 21 (35.5%) were IgG4 thyroiditis. Tumors were detected in 14 (36.8%) of the NonIgG4 thyroiditis cases, and in 16 (76.1%) of the IgG4 thyroiditis cases. The association of IgG4 thyroiditis with tumor is statistically significant (p thyroiditis cases. Perithyroidal extension was detected in six of the cases with tumor, and five of the six cases were IgG4 thyroiditis cases. The association of IgG4 (+) HT cases with increased papillary carcinoma prevalence is suggestive of that IgG4 (+) plasma cells can play a role in carcinogenesis in papillary carcinomas developed in HTs, without a chronic sclerosing ground. In addition, although the number of cases is limited, the high-association of IgG4 (+) plasma cells with adverse prognostic parameters such as

  8. IgG2 immunodeficiency: association to pediatric patients with bacterial meningoencephalitis Inmunodeficiencia de IgG2: asociación en pacientes pediátricos con meningoencefalitis bacterianas

    OpenAIRE

    XIOMARA ESCOBAR-PÉREZ; Dorta-Contreras,Alberto J; MARIA TERESA INTERIÁN-MORALES; ELENA NORIS-GARCÍA; MARITZA FERRÁ-VALDÉS

    2000-01-01

    An IgG subclass deficiency is often associated with bacterial infections. We studied four pediatric patients suffering from meningoencephalitis, two of them due to Streptococcus pneumoniae and two due to Haemophilus influenzae type b. Simultaneous diagnostic serum and cerebrospinal fluid samples were taken during income. The four subclasses of IgG and albumin were quantified in both biologic fluids by radial immunodiffusion. Very low levels of seric IgG2 with non detectable cerebrospinal flui...

  9. Simultaneous Quantification of Anticardiolipin IgG and IgM by Time Resolved Fluoroimmunoassay

    Science.gov (United States)

    Liu, Jie; Li, Mei; Ye, Yan; Chen, Yu

    2016-01-01

    The autoimmune disease antiphospholipid syndrome (APS) is characterized by the presence of anticardiolipin antibodies (aCL), along with anti-β2-glycoprotein I (β2GPI) antibodies and lupus anticoagulant (LA). In this study, we developed a time-resolved fluoroimmunoassay (TRFIA) system for simultaneous quantification of aCL IgG and IgM. A 96-well microtiter plate precoated with the complex of cardiolipin from bovine heart and bovine β2GPI was incubated with the anticardiolipin IgG and IgM standard substance or serum, and the conjugate of Eu3+-labeled anti-human IgG and Sm3+-labeled anti-human IgM was pipetted to the wells to form a tipical double-antibody-sandwich immunoreactions; finally the fluorescent intensity of Eu3+ and Sm3+ was detected to reflect the quantity of anticardiolipin IgG and IgM. This assay showed a good relationship between fluorescence intensities and the concentration of anticardiolipin antibody(aCL) IgG and IgM, with a low-end sensitivity of 0.1 U/ml for IgG and 0.1 U/ml for IgM, respectively. The intra- and inter-assay coefficients of variation (CV) of the calibrators was 3.0% and 4.51% for IgG, and 2.76% and 4.45% for IgM. The average recovery was 100.38% for aCL IgG and 100.45% for aCL IgM. For serum samples, the results of our method showed a good correlation with those obtained with ELISA kit. Simultaneous detection of aCL-IgG and aCL-IgM in the same reaction well can optimize assay performance by avoiding potential influence of different reaction conditions-timing, and well-to-well difference in concentration and characteristics of cardiolipin antigen. The results of a combo aCL-IgG and aCL-IgM assay for the same sample are more consistent and more reliable. This dual-label time-resolved fluoroimmunoassay is sensitive for detecting aCL IgG and IgM across a wide concentration range with stable reagents and may assist in the clinical diagnosis of antiphospholipid syndrome. PMID:27661084

  10. IgG4相关性腹膜后纤维化CT诊断%Diagnosis of IgG4-related retroperitoneal fibrosis

    Institute of Scientific and Technical Information of China (English)

    田芳; 朴雪梅; 周自明; 常时新; 丁永生

    2012-01-01

    Objective: To study and summarize the clinical features and the imaging manifestations of IgG4-related retroperitoneal fibrosis and to improve the understanding of IgG4-related sclerosing disease. Methods: A case of IgG4-related retroperitoneal fibrosis was reported,including clinical features,laboratory reports,imaging manifestations and pathological results,and relative literatures were reviewed. Results: The disease had no distinctive clinical features. Symptoms include vague pain in the lower back or abdomen,anorexia,fatigue,fever and weight loss. The imaging manifestation was soft tissue mass. The level of serum IgG (especially IgG4) was strikingly high. The histological manifestation in the involved organs showed diffuse infiltration of lymphoplasma cells and fibrosis. Abundant IgG4-positive plasma cells could be found and the treatment with glucocorticoid was effective. Conclusion:IgG4-related retroperitoneal fibrosis lacks specifity. It is essential to improve its understanding to avoid misdiagnosis.%目的:总结IgG4相关腹膜后纤维化的临床表现及影像特点,提高时IgG4相关的硬化性疾病的认识.方法:报告1例IgC4相关腹膜后纤维化的临床表现、实验室检查、影像学资料、病理结果等,并复习相关文献.结果:该病临床症状无明显特异性,可有腹痛、背痛、疲乏、食欲下降等,影像表现为腹膜后肿块,该病与自身免疫性胰腺炎关系密切,血清IgG尤其是IgG4显著升高;受累脏器组织学表现为弥漫性淋巴浆细胞漫润和纤维化,大量IgG4阳性浆细胞;糖皮质激素治疗有效.结论:IgG4相关腹膜后纤维化临床症状缺乏特异性,极易误诊或漏诊,需提高对该病的认识.

  11. IgG4相关唾液腺炎研究热点概述%Research hotspot in IgG4-related sialadenitis

    Institute of Scientific and Technical Information of China (English)

    王琼; 平飞云; 潘恒标

    2016-01-01

    IgG4相关疾病累及唾液腺称为IgG4相关唾液腺炎,中老年好发,男女性均可发病.IgG4相关唾液腺炎以唾液腺无痛性肿胀、血清IgG4升高、组织内大量特征性IgG4阳性浆细胞浸润伴纤维化为主要特点,糖皮质激素治疗反应良好.通过复习国内外文献,着重于该病近年来的研究热点阐述并分析多种免疫细胞和细胞因子、上皮间质转化参与的致病过程、正确看待血清IgG4浓度升高和组织IgG4阳性浆细胞浸润的临床病理意义及其诊断价值、与唾液腺癌和淋巴瘤的相关性、正电子发射型计算机断层摄影(positron emission tomography,PET)-CT的应用、唇腺活检对病理诊断的意义及治疗预后等问题.%IgG4-related disease is a novel clinical entity which can affect single or multiple organs.IgG4-related sialadenitis is referred to the salivary gland involvement of IgG4-related disease, with or without other organ involvement.IgG4-related sialadenitis is characterized by painless swelling or enlargement of salivary glands, high serum IgG4 level, abundant IgG4+ plasma cells infiltration with fibrosis histologically, and good response to glucocorticoids.With review of related articles, highlight and provide an overview of the most recent and focused findings and concepts of this disease, including the most significant pathogenic process based on kinds of immunocytes, cytokines, as well as participation of epithelial-mesenchymal transition, the clinical value of elevated serum IgG4 concentration and pathological role of infiltrated IgG4+ plasma cells, the potential relationship with salivary gland malignant tumor, the applying and usefulness of positron emission tomography-CT, the diagnostic utility of lip biopsy, treatment, prognosis, and also future perspectives.

  12. Rabbit IgG distribution in skin, spinal cord and DRG following systemic injection in rat.

    Science.gov (United States)

    Tonra, J R; Mendell, L M

    1997-12-01

    In order to determine the distribution of antibodies such as anti-NGF following systemic injection in neonates, immunocytochemical techniques were used to examine the localization of rabbit IgG in rat skin, DRG, and spinal cord after treatments with normal rabbit serum or purified rabbit IgG. Daily subcutaneous injections beginning on postnatal day 2 or on day 15 were given for three days. On the fourth day the animals were sacrificed and tissues were processed for rabbit IgG-IR. In the dorsal and ventral spinal cord, staining intensities suggest a substantial increase in the blood-brain barrier during the first two weeks after birth. Staining intensity in the epidermis of the glabrous skin from the hindpaw was substantially lower than in the adjacent dermis. In addition, IgG infrequently accumulated intracellularly in intensely stained patches in the epidermis. IgG was also able to reach relatively high intracellular concentrations in a small number of sensory neurons. The IgG staining pattern in the skin was similar when anti-NGF itself was administered to the animals. The results are discussed in the context of the effects of anti-NGF on the development of nociceptive afferents.

  13. IgG4-Related Disease Presenting as Recurrent Mastoiditis With Central Nervous System Involvement

    Directory of Open Access Journals (Sweden)

    April L. Barnado MD

    2013-09-01

    Full Text Available We report a case of a 43-year-old female who presented with right ear fullness and otorrhea. She was initially diagnosed with mastoiditis that was not responsive to multiple courses of antibiotics and steroids. She was then diagnosed with refractory inflammatory pseudotumor, and subsequent treatments included several mastoidectomies, further steroids, and radiation therapy. The patient went on to develop mastoiditis on the contralateral side as well as central nervous system involvement with headaches and right-sided facial paresthesias. Reexamination of the mastoid tissue revealed a significantly increased number of IgG4-positive cells, suggesting a diagnosis of IgG4-related disease. The patient improved clinically and radiographically with rituximab and was able to taper off azathioprine and prednisone. IgG4-related disease should be considered in patients with otologic symptoms and be on the differential diagnosis in patients with inflammatory pseudotumor. Staining for IgG and IgG4 is essential to ensure a prompt diagnosis and treatment.

  14. Isolated Liver Hilar Infiltration by IgG4 Inflammation Mimicking Cholangiocarcinoma

    Directory of Open Access Journals (Sweden)

    Laurent Bochatay

    2016-10-01

    Full Text Available IgG4-related disease represents a heterogeneous group of disease characterized by infiltration of various tissues by IgG4 plasmocytes. In case of liver infiltration, this condition classically mimics primary sclerosing cholangitis or multifocal cholangiocarcinoma due to inflammation that preferentially affects the intra- and extrahepatic bile duct. Diagnostic criteria have recently been reviewed in order to better define the disease and help physicians make the diagnosis. Herein, we present the case of a patient who died after liver surgery for suspected cholangiocarcinoma that finally turned out to be IgG4-associated liver disease, a condition being out of current consensual criteria. The patient presented with progressive cholestasis identified by MR cholangiography as an isolated hilar mass responsible for dilatation of the left and right intrahepatic bile duct suspicious for a Klatskin tumor. The IgG4 blood level was normal as was biliary cytology. The patient underwent right portal embolization followed by right extended hepatectomy. Pathologic examination found no tumor but intense fibrosclerotic infiltration with a marked inflammatory infiltrate characterized by IgG4-positive plasmocytes. Despite immunosuppressive treatment, cholestasis was never controlled and successive biopsies of the remaining liver showed progressive cholestasis, liver infiltrate and no bile duct regeneration. The patient finally presented an upper gastrointestinal hemorrhage leading to death 4 months after hepatectomy and appropriate immunosuppressive therapy.

  15. Activation of complement by an IgG molecule without a genetic hinge.

    Science.gov (United States)

    Brekke, O H; Michaelsen, T E; Sandin, R; Sandlie, I

    1993-06-17

    The hinge region links the two Fab arms to the Fc portion of the IgG molecule. It mediates flexibility to the molecule and serves as a connecting structure between the two heavy chains. In addition it provides space between the Fab and Fc parts. All three properties have been proposed to be important for the ability of IgG to initiate complement activation leading to complement-mediated cell lysis (CML). Here we report the construction of a hinge-deleted mouse-human chimaeric IgG3 molecule with specificity for the hapten NIP (3-iodo-4-hydroxy-5-nitrophenacetyl), HM-1. HM-1 lacks the genetic hinge, but has an introduced cysteine between Ala 231 (EU numbering) and Pro 232 in the lower hinge encoded by the CH2 exon. The introduced cysteine forms a disulphide bond between the two heavy chains of the molecule. In CML, HM-1 shows a greater activity than IgG3 wild type. This is the first time an IgG molecule without a genetic hinge has been found to be active in CML. We conclude that the hinge functioning as a spacer is not a prerequisite for complement activation. Rather, its major role seems to be to connect the heavy chains to each other in the amino-terminal part of CH2. Because HM-1 is expected to have low Fab-Fc flexibility, this molecular feature is probably of no importance for complement activation.

  16. Isolated Liver Hilar Infiltration by IgG4 Inflammation Mimicking Cholangiocarcinoma

    Science.gov (United States)

    Bochatay, Laurent; Majno, Pietro; Giostra, Emiliano; Frossard, Jean Louis

    2016-01-01

    IgG4-related disease represents a heterogeneous group of disease characterized by infiltration of various tissues by IgG4 plasmocytes. In case of liver infiltration, this condition classically mimics primary sclerosing cholangitis or multifocal cholangiocarcinoma due to inflammation that preferentially affects the intra- and extrahepatic bile duct. Diagnostic criteria have recently been reviewed in order to better define the disease and help physicians make the diagnosis. Herein, we present the case of a patient who died after liver surgery for suspected cholangiocarcinoma that finally turned out to be IgG4-associated liver disease, a condition being out of current consensual criteria. The patient presented with progressive cholestasis identified by MR cholangiography as an isolated hilar mass responsible for dilatation of the left and right intrahepatic bile duct suspicious for a Klatskin tumor. The IgG4 blood level was normal as was biliary cytology. The patient underwent right portal embolization followed by right extended hepatectomy. Pathologic examination found no tumor but intense fibrosclerotic infiltration with a marked inflammatory infiltrate characterized by IgG4-positive plasmocytes. Despite immunosuppressive treatment, cholestasis was never controlled and successive biopsies of the remaining liver showed progressive cholestasis, liver infiltrate and no bile duct regeneration. The patient finally presented an upper gastrointestinal hemorrhage leading to death 4 months after hepatectomy and appropriate immunosuppressive therapy. PMID:27843427

  17. Clinical evaluation of the Roche Elecsys CMV IgG Avidity assay.

    Science.gov (United States)

    Vauloup-Fellous, C; Lazzarotto, T; Revello, M G; Grangeot-Keros, L

    2014-08-01

    Congenital cytomegalovirus (CMV) infection has potentially severe consequences in newborns. The testing of pregnant women for CMV-specific antibodies may be useful for the identification of women at risk of transmitting the infection to the fetus. The determination of CMV IgG avidity helps to establish the timing of infection as IgG avidity matures during the course of infection. This study examines the performance of the Elecsys CMV IgG Avidity assay using preselected samples from patients at different phases of CMV infection. The Elecsys CMV IgG Avidity assay was tested at three sites using sequential samples from patients with recent primary CMV infection, as well as single samples from patients with recent primary or past CMV infection. The Elecsys assay discriminated well between early (low avidity) and late (high avidity) phases of infection in sequential serum samples. Overall, 98.8% of low-avidity samples corresponded to infection onset 90 days before sampling. The assay's sensitivity was 90-97%, with specificity ranging from 89 to 100%, depending on the consideration of gray-zone avidity values. Single samples from recent primary or past infection showed similar distributions of avidity results. The Elecsys CMV IgG Avidity assay results are in agreement with preselected samples from patients with primary or past CMV infection, showing that the test is an adequate predictor of the phase of infection.

  18. A case of tubulointerstitial nephritis in IgG4-related systemic disease with markedly enlarged kidneys.

    Science.gov (United States)

    Mise, Naobumi; Tomizawa, Yutaka; Fujii, Akiko; Yamaguchi, Yutaka; Sugimoto, Tokuichiro

    2009-06-01

    IgG4-related systemic disease, including autoimmune pancreatitis, is a multi-organ disorder characterized by elevated serum immunoglobulin G4 (IgG4) concentration and IgG4-positive plasma cell infiltration. We report the case of a 67-year-old man with IgG4-related tubulointerstitial nephritis, presenting with markedly enlarged kidneys and renal dysfunction. The serum IgG4 level was elevated with 4200 mg/dl and pathological examination revealed patchy, clearly fringed areas of IgG4-positive plasma cell infiltration and advanced fibrosis in the renal parenchyma, perirenal tissue and lymph nodes. With oral prednisolone at a dose of 60 mg daily, a contraction of the kidneys and an improvement of renal function were observed. No recurrence of the disease was observed during the reduction of prednisolone to 2 mg daily over 4 years.

  19. IgG4-related disease: a novel lymphoproliferative disorder discovered and established in Japan in the 21st century.

    Science.gov (United States)

    Masaki, Yasufumi; Kurose, Nozomu; Umehara, Hisanori

    2011-01-01

    IgG4-related disease is a novel lymphoproliferative disorder that shows hyper-IgG4-γ-globulinemia and IgG4-producing plasma cell expansion in affected organs with fibrotic or sclerotic changes. Patients show systemic inflammatory conditions and various symptoms depending on the affected organ. Since the first report of patients with elevated serum IgG4 in sclerosing pancreatitis in 2001, various systemic disorders described by many names have been reported. Despite similarities in the organs involved in IgG4-related Mikulicz's disease and Sjögren's syndrome, there are marked clinical and pathological differences between these conditions. Most patients diagnosed with autoimmune pancreatitis in Japan have IgG4-related pancreatitis [Type 1 autoimmune pancreatitis (AIP), lymphoplasmacytic sclerosing pancreatitis (LPSP)], a disease distinct from some of the western type [Type 2 AIP, idiopathic duct-centric chronic pancreatitis (IDCP), autoimmune pancreatitis with granulocytic epithelial lesions (GEL)]. Diagnosis of IgG4-related disease is characterized by both elevated serum IgG4 (>135 mg/dL) and histopathological features including lymphocyte and IgG4(+) plasma cell infiltration (IgG4(+) plasma cells/IgG(+) plasma cells>40%). Differential diagnosis from other distinct disorders, such as sarcoidosis, Castleman's disease, Wegener's granulomatosis, lymphoma, cancer, and other existing conditions associated with high serum IgG4 level or abundant IgG4-bearing plasma cells in tissues is necessary. We have begun a clinical prospective study to establish a treatment strategy (Phase II prospective treatment study for IgG4-multiorgan lymphoproliferative syndrome: UMIN R000002311).

  20. A Glycoform of Immunoglobulin G (IgG) as an Early Biomarker of Exposure to Nonhuman Substances

    Science.gov (United States)

    2012-12-01

    all of which were under-galactosylated IgG (G0 and G1) with core fucose on its constant region N-glycan. We hypothesized that the immunoglobulin...follows its denaturation, presumably because the fucose on the IgG is normally inaccessible to the lectin (1). Heating, or the use of denaturation...reagents such as urea, can fully denature the IgG protein and expose the fucose moieties. In addition, glycosidase treatment or solid-surface

  1. Anticuerpos circulantes contra Influenza Aviar y Newcastle en zanates (Quiscalus mexicanus de la ciudad de Guatemala (Avian flu and Newcastle Antibodies in Great-tailed Grackles (Quiscalus mexicanus in Guatemala city.

    Directory of Open Access Journals (Sweden)

    Escobar, Luis E.

    2011-03-01

    Full Text Available ResumenAunque el zanate (Quiscalus mexicanus está distribuido en todaGuatemala y se encuentra estrechamente ligado a poblaciones humanas,se sabe muy poco acerca de su estado sanitario y su papel comoreservorio de enfermedades aviares de importancia. Esta investigacióngenera información sobre el papel del zanate en la epizootiología de la Influenza Aviar (IA; Orthomyxoviridae y de Newcastle (ENC;Paramixoviridae, midiendo los anticuerpos circulantes en zanates norelacionados a granjas avícolas. Se colectaron 71 muestras de suero dezanates urbanos asintomáticos del la ciudad de Guatemala entre abril yjulio de 2008 y se analizaron con la prueba de Inhibición de laHemoaglutinación.SummaryDespite the Great-tailed Grackle (Quiscalus mexicanus is distributed in all Guatemala and it is so close to human populations, few is knownabout its sanitarian status and role as reservoir of important aviandiseases. This research provides information about the role of the Greattailed Grackle in the epizootiology of Avian Influenza (AI;Orthomyxoviridae and Newcastle Disease (NCD; Paramixoviridae,measuring the antibodies of Grackles non-related to avian farms. Wecollected 71 serum samples from urban Great-tailed Grackles without any symptoms in Guatemala City from April to June of 2008, and analyzed with hemagglutination Inhibition Test.

  2. Is IgG4-Related Disease a Cause of Xerostomia? A Cohort Study of 60 Patients

    Directory of Open Access Journals (Sweden)

    M. Hermet

    2012-01-01

    Full Text Available Objective. Immunoglobulin-G4-(IgG4- related disease (IgG4 RD is a fibrosing process characterized by a significant infiltration of IgG4-secreting plasma cells. IgG4 RD can affect almost all organs including salivary glands. Whether IgG4 RD plays a role in the development of sicca syndrome and particularly dry mouth syndrome remains to be investigated. Methods. We conducted a monocentric cohort study for two years to search for IgG4 RD features in patients with dry mouth syndrome using immunostainings of labial salivary gland specimens with anti-IgG4 antibody. Results. Among 60 patients presenting with dry mouth syndrome who underwent labial salivary gland biopsy, 18 showed positive immunostaining with the anti-IgG4 antibody including 4 patients with typical systemic IgG4 RD. Five also fulfilled criteria for Sjögren's syndrome. Conclusion. These findings suggest that clinical forms of IgG4 RD salivary involvement without salivary swelling may occur. This salivary involvement is probably overlooked in everyday practice and could represent a mild form of IgG4 RD.

  3. Significance of specific IgG against sensitizing antigens in extrinsic allergic alveolitis: serological methods in EAA.

    Science.gov (United States)

    Sterclova, M; Vasakova, M; Metlicka, M

    2011-01-01

    The aim of our study is to find differences in IgG in sera of potentially exposed and nonexposed individuals and to detect differences in concentrations of specific serum IgG among subjects with and without EAA. Seventy-two patients being followed for suspected interstitial lung disease were included. Specific IgG in sera were established by ImmunoCAP. Serum concentrations of Aspergillus fumigatus, Candida albicans IgG and mixture of moulds IgG were higher in subjects with exposure to relevant inhalation antigens (p<0.05). Patients exposed to parrot and mammal hair mixture had higher serum concentration of specific IgG (p<0.05). Subjects without exposure to mites had lower serum IgG to Dermatophagoides pteronyssinus, Dermatophagoides farinae, Dermatophagoides microceras and Glycophagus domesticus (p<0.05). Higher concentration of serum specific IgG may show previous exposure to this antigen. Even though mite specific IgG are not commonly tested in EAA patients, we suggest their immunomodulatory activity may influence susceptibility to other inhalation antigens.

  4. Dectin-1 agonist selectively induces IgG1 class switching by LPS-activated mouse B cells.

    Science.gov (United States)

    Seo, Beom-Seok; Park, Ha-Yan; Yoon, Hee-Kyung; Yoo, Yung-Choon; Lee, Junglim; Park, Seok-Rae

    2016-10-01

    Heat-killed Saccharomyces cerevisiae (HKSC) is an agonist for Dectin-1, a major fungal cell wall β-glucan receptor. We previously reported that HKSC selectively enhances IgG1 production by LPS-activated mouse B cells. To determine if this IgG1 selectivity is caused by selective IgG1 class switching, we performed RT-PCRs for measuring germline transcripts (GLTs), flow cytometric analyses for detecting Ig-expressing cells, and ELISPOT assays for measuring the number of Ig-secreting cells in HKSC/LPS-stimulated mouse B cell cultures. HKSC selectively enhanced expression of GLTγ1, the number of IgG1-expressing cells, and the number of IgG1-secreting B cells in the presence of LPS stimulation. In addition, HKSC induced the expression of CD69, an activation marker for B lymphocytes, and the expression of surface Dectin-1. Two Dectin-1 antagonists, laminarin and a neutralizing Dectin-1 antibody, selectively diminished HKSC-reinforced IgG1 production by LPS-stimulated B cells. Furthermore, depleted zymosan (dzn), a Dectin-1 agonist with increased selectivity, also selectively enhanced GLTγ1 transcription. The Dectin-1 antagonists blocked dzn-induced IgG1 production by LPS-activated B cells. Collectively, these results suggest that Dectin-1 agonists selectively induce IgG1 class switching by direct stimulation of Dectin-1 on LPS-activated B cells resulting in selective production of IgG1.

  5. Intrathecal IgG synthesis and autoantibody-secreting cells in multiple sclerosis

    DEFF Research Database (Denmark)

    Sellebjerg, Finn; Jensen, Claus V; Christiansen, Michael

    2000-01-01

    We studied intrathecal IgG synthesis and autoantibody-secreting cells in 148 patients with possible onset symptoms of MS (POSMS) or clinically definite MS (CDMS). In POSMS intrathecal synthesis of IgG oligoclonal bands and abnormalities on T2-weighted magnetic resonance imaging were associated...... but the former were more prevalent. The cerebrospinal fluid (CSF) leukocyte count and the number of anti-protelipid protein antibody-secreting cells in cerebrospinal fluid (CSF) correlated with disease activity in POSMS. Intrathecal IgG synthesis levels and the number of anti-myelin basic protein antibody......-secreting cells in CSF correlated with disease activity in CDMS. Our results support recent reports of pathogenetic heterogeneity and a pathogenetic role of the antibody response in MS...

  6. Isolation and Purification of Bovine Colostrum sIgA and IgG

    Institute of Scientific and Technical Information of China (English)

    YAO Yonghao; GAO Xuejun; LIU Xiaofei

    2008-01-01

    To further utilize bioactive substance such as bovine colostrum sIgA and lgG, slgA and IgG were isolated and purified simultaneously by salting out,ultrafiltration and gel chromatography,etc.The analysis of results were showed quantitatively by nonhydrogenized SDS-PAGE,and quanlities of sIgA and IgG were respectively detected by Western Blot. The results showed that the purity and yield of bovine colostrum slgA were 85.3% and 42.8%,respectively,while the purity and yield of bovine colostrum IgG were respectively 97.2% and 64.4%.This preparative method provides theoretical and experimental foundation for sIgA industrial production.

  7. Autoimmune pancreatitis metachronously associated with retroperitoneal fibrosis with IgG4-positive plasma cell infiltration

    Institute of Scientific and Technical Information of China (English)

    Terumi Kamisawa; Pong Yui Chen; Yuyang Tu; Hitoshi Nakajima; Naoto Egawa

    2006-01-01

    Retroperitoneal fibrosis is an uncommon disorder characterized by the formation of a dense plaque of fibrous tissue in the retroperitoneum, and its etiology remains unknown. Autoimmune pancreatitis is a rare type of chronic pancreatitis characterized by fibrosis with abundant infiltration of IgG4-positive plasma cells and lymphocytes and obliterative phlebitis in the pancreas. We present a case of autoimmune pancreatitis that developed 10 mo after the occurrence of retroperitoneal fibrosis. Histological findings of the resected retroperitoneal mass were marked periureteral fibrosis with abundant infiltration of IgG4-positive plasma cells and lymphocytes and obliterative phlebitis.These findings suggest a common pathophysiological mechanism for retroperitoneal fibrosis and autoimmune pancreatitis in this case. Some cases of retroperitoneal fibrosis might be a retroperitoneal lesion of IgG4-related sclerosing disease.

  8. Topiramate-induced maculopathy in IgG4-related disease

    Directory of Open Access Journals (Sweden)

    DaCosta J

    2016-06-01

    Full Text Available Joanna DaCosta,1,2 Saad Younis1 1Ophthalmology Department, Imperial College Healthcare NHS Trust, Western Eye Hospital, 2Barts Health NHS Trust, Whipps Cross University Hospital, London, UK Abstract: This report describes a case of reversible topiramate-induced maculopathy in a 32-year-old female patient with IgG4-related disease. The patient presented with decreased vision associated with anterior uveitis and cystoid macula edema, which was unresponsive to oral and topical steroids. Following topiramate cessation, both cystoid macula edema and vision improved. The ocular side effects of topiramate and putative pharmacological mechanisms for topiramate-induced maculopathy in the context of IgG4-related disease are discussed. This report highlights that neurologists and ophthalmologists should be aware that patients presenting with topiramate-associated maculopathy should be advised to discontinue topiramate promptly to prevent irreversible loss of vision. Keywords: IgG4 disease, maculopathy, topiramate

  9. IgG4-related intraocular inflammation masquerading as ciliary body melanoma in a young girl

    Directory of Open Access Journals (Sweden)

    Dipankar Das

    2016-01-01

    Full Text Available Immunoglobulin G4 (IgG4-related diseases affects various tissues and organs of the human body. Orbital, adnexal, and scleral inflammations were already reported in the medical literature. To the best of our knowledge, we report the first case of intraocular IgG4-associated inflammatory mass in the ciliary body mimicking as a melanoma in a 23-year-old female from Northeast India. Characteristic histopathology, immunohistochemistry in the tissue, protein chemistry, and raised serum IgG4 were supportive for the diagnosis. As this newly diagnosed disease has multi-organ affection and little is known about its pathogenesis particularly in eye and adnexa, the present case will open many challenges in clinico-pathological diagnosis and research in the future.

  10. Homogeneous Detection of Human IgG by Gold Nanoparticle Probes

    Institute of Scientific and Technical Information of China (English)

    CAO Qihua; YUAN Hong; CAI Ruxiu

    2009-01-01

    A simple,and homogeneous detection system for human IgG based on the optical properties of aggregated gold nanoparticles probes were investigated.When gold nanoparticles with about 13 nm in diameter were modified by goat anti-human IgG,the addition of human IgG could change the absorption of colloidal gold solution,and the absorption intensity at 740 nm depended on the amount of human IgG.The aggregation of gold nanoparticles was also validated using transmission electron microscopy(TEM).A series of experiments were carried out to study the effects of pH value, the reaction temperature,and non-specific adsorption on the assay.A dynamic range of 10-500μg/~3 mL human IgG was observed.The new bioassay could be used for the rapid and ho-mogeneous detection of antibodies in bioanalytical chemistry.

  11. Recurrent meningitis in a child with IgG3 subclass deficiency.

    Science.gov (United States)

    Vehapoglu, Aysel; Ozgurhan, Gamze; Demir, Aysegul Dogan; Uzuner, Selcuk; Nursoy, Mustafa Atilla; Turkmen, Serdar

    2014-08-01

    Recurrent meningitis is an uncommon life-threatening condition. Here, the case of a 6-year-old boy is reported who had two episodes of meningitis with an IgG3 subclass deficiency. The boy had aseptic meningitis at the age of 3 years, followed by bacterial meningitis at the age of 4 years. Primary immunoglobulin deficiencies are a group of disorders associated with an increased incidence and/or severity of infection. Recurrent infections, sinusitis, bronchitis, and pneumonia are the most frequently observed illnesses in patients with IgG subclass deficiencies, of which an IgG3 subclass deficiency is the most common, especially in adults. Although cases of recurrent viral or bacterial meningitis have been reported, herein a patient is presented with recurrence of aseptic and bacterial meningitis 1 year after the initial episode. Some researchers recommend that all children with episodes of recurrent meningitis should be screened for primary immunoglobulin or complement deficiencies.

  12. Proliferative glomerulonephritis with monoclonal IgG deposits in a patient with autoimmune hemolytic anemia.

    Science.gov (United States)

    Fujiwara, Takashi; Komatsuda, Atsushi; Ohtani, Hiroshi; Togashi, Masaru; Sawada, Ken-Ichi; Wakui, Hideki

    2013-06-01

    A 25-year-old woman was admitted because of proteinuria. A renal biopsy showed mesangial/endocapillary proliferative glomerulonephritis with IgG2-κ deposits. Electron microscopy showed immune complex-type deposits. She also had Coombs-positive hemolytic anemia, anticardiolipin antibodies, and antinuclear antibodies. Middle-dose steroid therapy led to improvement of proteinuria and hemolytic anemia. Six years later, she developed crescentic glomerulonephritis with IgG2-κ deposits during pregnancy. Middle-dose steroid therapy improved renal dysfunction. This is an exceptional case of proliferative glomerulonephritis with monoclonal IgG deposits (PGNMID), a recently described rare dysproteinemia-related glomerulonephritis, associated with autoimmune disease. This case also suggests that crescentic glomerulonephritis can be superimposed on PGNMID.

  13. Contactin 1 IgG4 associates to chronic inflammatory demyelinating polyneuropathy with sensory ataxia.

    Science.gov (United States)

    Miura, Yumako; Devaux, Jérôme J; Fukami, Yuki; Manso, Constance; Belghazi, Maya; Wong, Anna Hiu Yi; Yuki, Nobuhiro

    2015-06-01

    A Spanish group recently reported that four patients with chronic inflammatory demyelinating polyneuropathy carrying IgG4 autoantibodies against contactin 1 showed aggressive symptom onset and poor response to intravenous immunoglobulin. We aimed to describe the clinical and serological features of Japanese chronic inflammatory demyelinating polyneuropathy patients displaying the anti-contactin 1 antibodies. Thirteen of 533 (2.4%) patients with chronic inflammatory demyelinating polyneuropathy had anti-contactin 1 IgG4 whereas neither patients from disease or normal control subjects did (P = 0.02). Three of 13 (23%) patients showed subacute symptom onset, but all of the patients presented with sensory ataxia. Six of 10 (60%) anti-contactin 1 antibody-positive patients had poor response to intravenous immunoglobulin, whereas 8 of 11 (73%) antibody-positive patients had good response to corticosteroids. Anti-contactin 1 IgG4 antibodies are a possible biomarker to guide treatment option.

  14. Comparison of Four Commercial Kits to Detect HSV-2 IgG Antibody

    Institute of Scientific and Technical Information of China (English)

    Song Biao(宋彪); Chen Xiangsheng(陈祥生); Yin Yueping(尹跃平); Yao Xu(姚煦); Li Wengzhong(李文忠)

    2004-01-01

    Objectives: To compare the efficiency of four commercial ELISA kits in detecting type-specific HSV-2 IgG antibodies. Materials and Methods: A total of 125 subjects, including 105 with genital ulcers, and 20 controls without any history of STDs were recruited from the STD clinic for detection of type-specific HSV-2 IgG antibody with different kits. Four kinds of commercially available ELISA kits, including Quida HSV2 IgG ELISA (Aifulang Biochem Co. Ltd., Hangzhou), TORCH-HSV2 IgG (Jingmei Biotech Co. Ltd., Shanghai), CaptiaTM HSV2 IgG (Trinity biotech, USA ) and HerpeSelect TM 2 ELISA IgG (Focus technologies, USA) were used for evaluation. Western Blot assay was performed as a gold standard.Results: Compared to Western Blot results, the sensitivity and specificity of the kits (Quida HSV2, TORCHHSV2, CaptiaTM HSV2 and HerpeSelectTM 2) were 13.1% and 98.4%, 7.5% and 100%, 100% and 11.1%,87.7 % and 96.7 %, respectively. The positive predictive value (PV) and negative PV of the four kits were 88.9%and 54.3%, 100% and 55.5%, 55.6% and 100%, 96.2%and 89.2%, respectively. The areas under the ROC curve of three kits (Quida HSV2, CaptiaTM HSV2 andHerpeSelectTM 2) were 0.885 (0.822~0.948), 0.825 (0.747- 0.902), 0.974 (0.950 - 0.998), respectively Conclusion: The performance of HerpeSelectTM 2 is the best among the four kits. The results also indicate that the commercially available kits for detection of type-specific HSV2 antibody should be re-evaluated in terms of their validity.

  15. High Serum IgG4 Concentrations in Patients with Hashimoto’s Thyroiditis

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    Anna Popławska-Kita

    2015-01-01

    Full Text Available Purpose. Since recent reports suggest that Hashimoto thyroiditis (HT may be associated with IgG4-related disease, we aimed to find out whether the measurement of serum IgG4 allows for the identification of distinct types of HT, with different clinical, sonographic, and serologic characteristics. Methods. The group studied consisted of 53 patients with HT and 28 healthy individuals who underwent thyroid ultrasonography and body composition analysis. Serum concentrations of IgG4, TSH, anti-peroxidase antibodies (TPOAb, anti-TSH receptor antibodies, TNF-α, TGF-β1, Fas Ligand, TRAIL, and chemokines (CXCL9, CXCL11, and CXCL10 were measured by ELISA or radioimmunoassay. Results. The group with IgG4 level >135 IU/ml accounted for 32.5% of the patients. The signs of fibrosis were present in 27.0% of the high-IgG4 patients and in 9.1% of the normal-IgG4 group. The patients with elevated IgG4 required higher doses of L-thyroxine and had significantly lower level of TPOAb (P=0.02 than the non-IgG4-HT individuals and higher TNF-α level in comparison with the controls (P=0.01. Conclusions. Our results suggest that the measurement of serum IgG4 allows for an identification of patients with more rapid progression of HT, requiring higher doses of L-thyroxine. Low TPOAb level and the absence of coexisting autoimmune diseases may suggest distinct pathomechanism of this type of thyroiditis.

  16. Extraction of monoclonal antibodies (IgG1) using anionic and anionic/nonionic reverse micelles.

    Science.gov (United States)

    George, Daliya A; Stuckey, David C

    2010-01-01

    Purification schemes for antibody production based on affinity chromatography are trying to keep pace with increases in cell culture expression levels and many current research initiatives are focused on finding alternatives to chromatography for the purification of Monoclonal antibodies (MAbs). In this article, we have investigated an alternative separation technique based on liquid-liquid extraction called the reverse micellar extraction. We extracted MAb (IgG1) using reverse micelles of an anionic surfactant, sodium bis 2-ethyl-hexyl sulfosuccinate (AOT) and a combination of anionic (AOT) and nonionic surfactants (Brij-30, Tween-85, Span-85) using isooctane as the solvent system. The extraction efficiency of IgG1 was studied by varying parameters, such as pH of the aqueous phase, cation concentration, and type and surfactant concentration. Using the AOT/Isooctane reverse micellar system, we could achieve good overall extraction of IgG1 (between 80 and 90%), but only 30% of the bioactivity of IgG1 could be recovered at the end of the extraction by using its binding to affinity chromatography columns as a surrogate measure of activity. As anionic surfactants were suspected as being one of the reasons for the reduced activity, we decided to combine a nonionic surfactant with an anionic surfactant and then study its effect on the extraction efficiency and bioactivity. The best results were obtained using an AOT/Brij-30/Isooctane reverse micellar system, which gave an overall extraction above 90 and 59% overall activity recovery. An AOT/Tween-85/Isooctane reverse micellar system gave an overall extraction of between 75 and 80% and overall activity recovery of around 40-45%. The results showed that the activity recovery of IgG1 can be significantly enhanced using different surfactant combination systems, and if the recovery of IgG1 can be further enhanced, the technique shows considerable promise for the downstream purification of MAbs.

  17. Actively induced platelet-bound IgG associated with thrombocytopenia in the marmoset

    Energy Technology Data Exchange (ETDEWEB)

    Gengozian, N.; McLaughlin, C.L.

    1978-06-01

    Interspecies platelet immunizations among marmosets lead to antibody formation to the donor platelets and a profound thrombocytopenia, which when associated with anemia may result in death of the animal. This actively induced immonologic thrombocytopenia closely resembles two clinical disease entities manifesting autoimmune thrombocytopenia, posttransfusion purpura and idiopathic thrombocytopenic purpura. Although antibody to donor-type platelets could be demonstrated readily, antihost activity was most often nondetectable or, when present, was in very low titer. A consistent finding was the appearance of IgG on the host's platelets shortly after immunization and concomitant with the appearance of antidonor platelet antibody. In 3 of 13 immunized animals thromoocytopenia did not occur even though antibody was formed and the host's platelets became IgG positive. In those animals that recovered from the induced thrombocytopenia IgG-positive platelets were found for periods ranging from 30 to greater than 100 days. Splenectomy before or after immunization did not alter the sequential development of antibody formation, appearance of IgG-positive platelets, and thrombocytopenia. Eluates prepared from IgG-positive platelets contained IgG and platelet antigens; the eluted IgG could attach nonspecifically to platelets of host or donor (immunizing) type, in contrast to the species specificity demonstrated for IgG eluted from platelets that had been reacted in vitro with specific antibody. Platelets in a few normal, nonimmunized marmosets were found to have signficant amounts of IgG on their surface, comparable to that observed in the immunized animal; interestingly, such IgG-positive platelets were found among imported but not laboratory-bred marmosets.

  18. The Accuracy of IgG Avidity for Detection of Acute Toxoplasmosis among Pregnant Saudi Women

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    Eman El Masry El Damarany

    2010-02-01

    Full Text Available AIM: The diagnosis of acute toxoplasmosis depends on the presence of immunoglobulin M (IgM, but it may persist for a long time in some cases. The objective of this study was to determine the role and accuracy of IgG avidity for the detection of acute Toxoplasmosis in early pregnancy. METHOD: The study included 160 women. Sera were screened for anti-Toxoplasma IgG and IgM and for IgG-avidity using ELIZA. PCR was done for confirmation in selected group of specimens. This study was performed at the College of Medicine, King Faisal University, Saudi Arabia from January 2008 through April 2009. RESULTS: 32 cases of low avidity were negative IgM while 15 cases of high avidity were positive IgM. 16 cases of low avidity were positive IgG. The accuracy of low avidity in relation to positive IgM revealed a sensitivity, specificity, positive predictive value, negative predictive value and likelihood ratio of 77.0%, 51.5%, 64.0%, 66.7% and 1.58 respectively. The accuracy of low IgG avidity in comparison with PCR demonstrated 91%, 45.7%, 60.4% and 84.2% respectively. CONCLUSION: Negative IgM didn’t exclude recent Toxoplasma infection and positive IgG may be present with recent infection. IgG avidity testing help in accurate differentiation of recent infections. [TAF Prev Med Bull 2010; 9(1.000: 7-14

  19. Neuromyelitis optica IgG in the cerebrospinal fluid induces astrocytopathy in optic nerve

    DEFF Research Database (Denmark)

    Soelberg, Kerstin; Lillevang, Søren Thue; Mørch, Marlene;

    Background: Serum immunoglobulin G targeting the astrocyte water channel aquaporin-4 (AQP4) in the central nervous system (CNS) is a biomarker for neuromyelitis optica spectrum disease (NMOSD). Optic neuritis (ON) is believed to be immune-mediated and is associated with AQP4-IgG in NMOSD-ON. The ......Background: Serum immunoglobulin G targeting the astrocyte water channel aquaporin-4 (AQP4) in the central nervous system (CNS) is a biomarker for neuromyelitis optica spectrum disease (NMOSD). Optic neuritis (ON) is believed to be immune-mediated and is associated with AQP4-IgG in NMOSD...

  20. The study of 3-dimensional structures of IgG with atomic force microscopy

    Institute of Scientific and Technical Information of China (English)

    YU Yi-gang; XU Ru-xiang; JIANG Xiao-dan; KE Yi-quan

    2005-01-01

    Objective: To detect 3-dimensional images of anti-N-methyl-D-aspartate receptor Nr1 (NMDAr1) polycolonal IgG affixed on mica in physiological environment. Methods: The images and data were obtained from a contact mode and commercial Si3N4 probed tip by using atomic force microscope (AFM). Conclusions: Using AFM to investigate biomacromolecule can make us deeply understand the structure of IgG, which will instruct us to detect the membrane receptor protein as a labelling agent.

  1. Advances in the diagnosis and treatment of IgG4-related sclerosing cholangitis:a review

    Institute of Scientific and Technical Information of China (English)

    Shunda Du; Gang Liu; Yilei Mao

    2015-01-01

    Immunoglobulin G4-related sclerosing cholangitis (IgG4-SC) is an IgG4-related disease characterized by bile duct fibroinflammatory wal-thickening and stenosis, resulting in obstruction jaundice, weight loss. Dif-ferent regions of the bile duct can be involved, with the distal region being the most common. IgG4-SC can also have other organ involvement, such as the pancreas, urinary tract, salivary glands and lacrimal glands. In clinical practice, the manifestation of IgG4-SC is very similar to cholangiocarcinoma (CC) and primary sclerosing cholangitis (PSC), as wel as pancreatic malignancies, while the treatment and prognosis are totaly diferent. Japanese researchers ever established the clinical diagnostic criteria in 2012: (1) charac-teristic biliary imaging findings; (2) elevated serum IgG4 concentrations; (3) the coexistence of IgG4-related diseases except those of the biliary tract; and (4) characteristic histopathological features. According to our observations, IgG4-SC can be distinguished from CC with 100% specificity only at a cutof of six times the upper normal limit. Imaging findings have low specificity for diagnosis, with the exception of intraductal ultrasonography, which can reflect the lesion with relatively high specificity. IgG4 plasma cel infiltration can be found in bile duct biopsy tissue, although this procedure is dificult. According to recent studies, the treatment of IgG4-SC relies mainly on corticosteroids. Folowing steroid treatment, most IgG4-SC patients can recover and their symptoms are resolved although a few patients relapse after steroid withdrawal. Maintenance of steroid therapy or alternative drugs is necessary in such cases. There is, however, no strong evidence for malignant transformation in IgG4-SC.

  2. A brief contextualization on IgG4 tubulointerstitial nephritis based on a case report in south Brazil.

    Science.gov (United States)

    Pêgas, Karla Lais; Cambruzzi, Eduardo; Lobato, Gisele

    2016-06-01

    IgG4-related disease (IgG4RD) is a recent inflammatory process of supposed autoimmune etiology, which is characterized by elevated serum IgG4 levels, dense lymphoplasmacytic infiltration rich in IgG4-positive plasma cells and storiform fibrosis. Tubulointerstitial nephritis is the most common renal manifestation, with different degrees of kidney dysfunction and variable clinical findings. Herein, the authors describe a new case of IgG4 tubulointerstitial nephritis (IgG4TN), and discuss clinic and pathologic criteria. Male patient, 72 years-old, was admitted on hospital service with clinical complaint of asthenia, loss of strength, emaciation, and anosmia. Previous history included type 2 diabetes mellitus. Laboratorial data included normochromic anemia, proteinuria, and creatinine elevation. Bilateral kidney ultrassonography/computed tomography revealed a heterogenous parenchyma, with diffuse irregular dense zones, areas of fibrosis on upper poles, and hydronephrosys. Kidney biopsy showed a dense interstitial lymphoplasmacytic infiltrate, with more than 50 plasma cell per high power field, irregular areas of fibroblastic and collagenous fibrosis, focal tubulitis, and normal glomeruli. Immunofluorescence revealed mild granular deposition of C3c and IgG in the tubular basement membrane. Immunohistochemestry was positive for CD138, lambda and Kappa light chains, and IgG4 (around forty five IgG4 positive plasma cells per high power field). IgG4 serum level was increased. The diagnosis of IgG4TN was then established. The patient received corticotherapy and strict control of glycemia with insulin, with marked improvement of symptoms and creatinine levels.

  3. Three-dimensional structure of the human myeloma IgG2.

    Directory of Open Access Journals (Sweden)

    Sergey Ryazantsev

    Full Text Available Human immunoglobulin G, subclass 2 (hIgG2, plays an important role in immunity to bacterial pathogens and in numerous pathological conditions. However, there is a lack of information regarding the three-dimensional (3D structure of the hIgG2 molecule. We used electron microscopy (EM, differential scanning microcalorimetry (DSC and fluorescence for structural analysis of the hIgG2. DSC and fluorescence indicated two types of interaction between CH1 domain of Fab (antigen-binding fragment/subunit and CH2 domain of Fc (complement fixation fragment/subunit simultaneously present in the sample: close interaction, which increases the thermostability of both, CH1 and CH2 domains, and weak (or no interaction, which is typical for most IgGs but not hIgG2. Thermodynamics could not determine if both types of interactions are present within a single molecule. To address this question, EM was used. We employed a single-particle reconstruction and negative staining approach to reveal the three-dimensional structure of the hIgG2. A three-dimensional model of hIgG2 was created at 1.78 nm resolution. The hIgG2 is asymmetrical: one Fab subunit is in close proximity to the upper portion of the Fc subunit (CH2 domain and the other Fab is distant from Fc. The plane of Fab subunits is nearly perpendicular to Fc. EM structure of the hIgG2 is in good agreement with thermodynamic data: a Fab distant from Fc should exhibit a lower melting temperature while a Fab interacting with Fc should exhibit a higher melting temperature. Both types of Fab subunits exist within one molecule resembling an A/B hIgG2 isoform introduced earlier on physicochemical level by Dillon et al. (2008. In such an arrangement, the access to the upper portion of Fc subunit is partially blocked by a Fab subunit. That might explain for instance why hIgG2 mildly activates complement and binds poorly to Fc receptors. Understanding of the three-dimensional structure of the hIgG2 should lead to better

  4. Detection of FMD virus type specific IgG1, IgG2 and IgA antibodies in milk and serum of buffaloes vaccinated with oil adjuvanted polyvalent FMD vaccine

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    R. Sharma

    2010-02-01

    Full Text Available The present investigation was carried out on 15 randomly selected milch buffaloes divided into three groups on the basis of lactation at an organized farm, to study the foot and mouth disease virus type specific antibodies in milk and serum following FMD vaccination. Milk and serum samples collected before vaccination i.e. 0 day and on 7, 14, 28, 42 and 56 days post vaccination, were analyzed for the detection of FMD virus specific IgG1, IgG2 and IgA antibody response by indirect double antibody sandwich ELISA. Significant FMD virus type specific antibody titres (IgG1, IgG2 and IgA were detected in milk and serum of buffaloes on different days post vaccination, though the levels of antibodies were lower in milk as compared to serum. FMD virus type specific IgG1 was found to be the predominant subclass as compared to IgG2 and IgA both in milk and serum of vaccinated buffaloes. Milk and serum IgG1, IgG2 and IgA antibody titres were positively correlated with values of regression coefficient (R as 0.506, 0.434 and 0.396, respectively.

  5. Human milk IgGs contain various combinations of different antigen-binding sites resulting in multiple variants of their bispecificity.

    Directory of Open Access Journals (Sweden)

    Sergey E Sedykh

    Full Text Available In the classic paradigm, immunoglobulins represent products of clonal B cell populations, each producing antibodies (Abs recognizing a single antigen. There is a common belief that IgGs in mammalian biological fluids are monovalent molecules having stable structures and two identical antigen-binding sites. However, human milk IgGs to different antigens undergo extensive half-molecule exchange. In the IgGs pool, only 33 ± 5% and 13 ± 5% of Abs contained light chains exclusively of kappa- or lambda-type, respectively, while 54 ± 10% of the IgGs contained both kappa- and lambda- light chains. All Ab preparations contained different amounts of IgGs of all four subclasses. Interestingly, lambda-IgGs contained an increased amount of IgG2 (87% and only 3-6% of each of IgG1, IgG3, and IgG4, while kappa-IgGs consisted of comparable (17-32% amounts of all IgG subtypes. Chimeric kappa-lambda-IgGs consisted of ~74% IgG1, ~16% IgG2, ~5% IgG3 and ~5% IgG4. As the result of the exchange, all IgG fractions eluted from several specific affinity sorbents under the conditions destroying strong immunocomplexes demonstrated high catalytic activities in hydrolysis of ATP, DNA, oligosaccharides, phosphorylation of proteins, lipids, and oligosaccharides. In vitro, an addition of reduced glutathione and milk plasma to two IgG fractions with different affinity for DNA-cellulose led to a transition of 25-60% of Ab of one fraction to the other fraction. Our data are indicative of the possibility of half-molecule exchange between milk IgGs of various subclasses, raised against different antigens (including abzymes, which explains the polyspecificity and cross-reactivity of these IgGs.

  6. Prevalencia de anticuerpos antitreponémicos y características sociodemográficas de la población mexicana adulta en el año 2000 Anti-Treponema pallidum seroprevalence and sociodemographic characteristics in Mexican adult population, 2000

    Directory of Open Access Journals (Sweden)

    Carlos J Conde-González

    2007-01-01

    Full Text Available OBJETIVO: Determinar la frecuencia de anticuerpos antitreponémicos en mexicanos adultos de ambos sexos y las características de la población relacionadas con la infección sifilítica. MATERIAL Y MÉTODOS: Se analizaron para anti-Treponema pallidum 12 010 sueros seleccionados de forma aleatoria de la Encuesta Nacional de Salud 2000, con aplicación de un algoritmo conformado por técnicas serológicas treponémicas y no treponémicas, de tamizaje y confirmatorias, y se realizó un análisis estadístico para identificar los factores vinculados con la seropositividad. RESULTADOS: La seroprevalencia de anticuerpos antitreponémicos fue de 3.1% (IC95% 2.5-3.7. Las características relacionadas de modo significativo con la exposición a la infección fueron la mayor edad (RM 3.3, sexo masculino (RM 1.3, residencia en la región geográfica sur del país (RM 1.7, vivir en unión libre (RM 2.7 o ser viudo (RM 1.8, inicio de relaciones sexuales a edad temprana (RM 6.3 y, en las mujeres en particular, se identificó el antecedente de mortinatos (RM 1.8 y el informe de falta de uso del condón como método anticonceptivo (RM 14.1. CONCLUSIONES: Los hallazgos del estudio demuestran que la magnitud del antecedente de la infección por el treponema en la población mexicana adulta es considerablemente mayor respecto del que permite calcular la notificación oficial de casos de la enfermedad. Como sucede con otras infecciones de transmisión sexual, aspectos sociodemográficos, de género y las prácticas sexuales no seguras incrementan la transmisión del agente etiológico. En México existe la necesidad de reforzar la vigilancia de la infección sifilítica a través de un diagnóstico oportuno y eficaz de los casos, más su adecuado tratamiento, para coadyuvar al control del padecimiento.OBJECTIVE: To measure for the first time in a population based study the prevalence of antibodies against Treponema pallidum among the Mexican adult population and

  7. [Serum IgG antibodies to GD1a and GM1 gangliosides in elderly people].

    Science.gov (United States)

    Kolyovska, V

    2016-01-01

    Nowadays, the percentage of elderly people in society grows. Good nutrition and medical care help older people to have a normal life over 80 to 90 years. In the last ten years it is of critical importance to establish the clinical significance of serum IgG anti-GD1a and anti-GM1 ganglioside antibodies as potential biomarkers for neuronal damage in neurodegenerative diseases and immune-mediated neuropathies and demyelination. In the current study, the diagnostic values of IgG anti-GD1a and anti-GM1 antibodies were determined by the ELISA method in serum samples of 18 elderly patients (71-91 years). Significantly elevated serum IgG anti-GD1a and anti-GM1 antibodies titers were detected only in patients over 80 years. These data suggest that the immune-mediated neuropathies, neurodegeneration and demyelination in healthy elderly occur after 80 years old. Therefore, IgG anti-GD1a and anti-GM1 antibodies can serve as biomarkers, showing the nervous system dysfunction.

  8. In-depth analysis of subclass-specific conformational preferences of IgG antibodies

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    Xinsheng Tian

    2015-01-01

    Full Text Available IgG subclass-specific differences in biological function and in vitro stability are often referred to variations in the conformational flexibility, while this flexibility has rarely been characterized. Here, small-angle X-ray scattering data from IgG1, IgG2 and IgG4 antibodies, which were designed with identical variable regions, were thoroughly analysed by the ensemble optimization method. The extended analysis of the optimized ensembles through shape clustering reveals distinct subclass-specific conformational preferences, which provide new insights for understanding the variations in physical/chemical stability and biological function of therapeutic antibodies. Importantly, the way that specific differences in the linker region correlate with the solution structure of intact antibodies is revealed, thereby visualizing future potential for the rational design of antibodies with designated physicochemical properties and tailored effector functions. In addition, this advanced computational approach is applicable to other flexible multi-domain systems and extends the potential for investigating flexibility in solutions of macromolecules by small-angle X-ray scattering.

  9. Relationship between chronic sclerosing dacryoadenitis with high level of IgG4 and Castleman disease

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    Toshiyuki Oshitari

    2010-12-01

    Full Text Available Toshiyuki Oshitari1, Jiro Yotsukura1, Kaoru Asahagi1, Takayuki Baba1, Takashi Kishimoto2, Shuichi Yamamoto11Department of Ophthalmology and Visual Science, 2Department of Molecular Pathology, Chiba University Graduate School of Medicine, Chiba, JapanAbstract: The purpose of this study is to present a case of chronic sclerosing dacryoadenitis with high level of IgG4 in a patient diagnosed earlier with Castleman disease. A 79-year-old man noticed a swelling of his lower left jaw that was first seen 8 years earlier. He was diagnosed with Castleman disease from the histopathological examination of a biopsy of the submandibular gland. Since then, the size of the gland had not changed, and he had no systemic inflammatory signs or symptoms. He developed diplopia a year earlier, and CT scans showed bilateral swelling of the lacrimal glands. He was referred to our hospital for further examinations. The patient underwent partial dacryoadenectomy. From the histopathological examinations, he was diagnosed with chronic sclerosing dacryoadenitis with high level of the serum IgG4. He underwent oral steroid therapy and the swollen lacrimal glands were significantly improved. The results suggest that there may be pathological links between IgG4-related dacryoadenitis and Castleman disease.Keywords: IgG4, dacryoadenitis, Castleman disease, steroid

  10. Isolated IgG4-related cholecystitis mimicking gallbladder cancer: a case report.

    Science.gov (United States)

    Shin, Sang-Wook; Kim, Yongsoo; Jeong, Woo Kyoung; Kim, Jinoo; Kim, Min Yeong; Oh, Young Ha; Pyo, Ju Yeon

    2013-01-01

    A 58-year-old man with right upper quadrant pain was referred to the radiology department. The patient underwent computed tomography and magnetic resonance imaging, which suggested the diagnosis of gallbladder cancer invading the liver. After surgical removal of the gallbladder, and the adjacent liver parenchyma was performed, the histologic diagnosis of IgG4-related cholecystitis was made.

  11. Amplified Immunoassay of Human IgG Using Real-time Biomolecular Interaction Analysis (BIA) Technology

    Institute of Scientific and Technical Information of China (English)

    PEI,Ren-Jun(裴仁军); CUI,Xiao-Qiang(崔小强); YANG,Xiu-Rong(杨秀荣); WANG,Er-Kang(汪尔康)

    2002-01-01

    An automated biomolecular interaction analysis instrument (BIAcore) based on surface plasmon resonance (SPR) has been used to determine human immunoglobulin G (IgG) in real time. Polyclonal anti-human IgG antibody was covalently immobilized to a carboxymethyldextran-modified gold film surface. The samples of human IgG prepared in HBS buffer were poured over the immobilized surface. The signal amplification antibody was applied to amplify the response signal. After each measurement, the surface was regenerated with 0.1 mol/L H3PO4. The assay was rapid, requiring only 30 min for antibody immobilization and 20 min for each subsequent process of immune binding, antibody amplification and regeneration. The antibody immobilized surface had good response to human IgG in the range of 0.12-60 nmol/L with a detection limit of 60 pmoL/L. The same antibody immobilized surface could be used for more than 110 cycles of binding, amplificafion and regeneration. The results demonstrate that the sensitivity, specificity and reproducibility of amplified immunoassay using real-time BIA technology are satisfactory.

  12. IgG Responses to Tissue-Associated Antigens as Biomarkers of Immunological Treatment Efficacy

    Directory of Open Access Journals (Sweden)

    Heath A. Smith

    2011-01-01

    Full Text Available We previously demonstrated that IgG responses to a panel of 126 prostate tissue-associated antigens are common in patients with prostate cancer. In the current report we questioned whether changes in IgG responses to this panel might be used as a measure of immune response, and potentially antigen spread, following prostate cancer-directed immune-active therapies. Sera were obtained from prostate cancer patients prior to and three months following treatment with androgen deprivation therapy (=34, a poxviral vaccine (=31, and a DNA vaccine (=21. Changes in IgG responses to individual antigens were identified by phage immunoblot. Patterns of IgG recognition following three months of treatment were evaluated using a machine-learned Bayesian Belief Network (ML-BBN. We found that different antigens were recognized following androgen deprivation compared with vaccine therapies. While the number of clinical responders was low in the vaccine-treated populations, we demonstrate that ML-BBN can be used to develop potentially predictive models.

  13. A novel chemiluminescent immunoassay for detection of Toxoplasma gondii IgG in human sera.

    Science.gov (United States)

    Holec-Gąsior, Lucyna; Ferra, Bartłomiej; Czechowska, Justyna; Serdiuk, Illia E; Krzymiński, Karol; Kur, Józef

    2016-08-01

    This study describes Toxoplasma gondii IgG chemiluminescent immunoassay (CLIA) based on the use of a novel immunochemical reagents in the form of the conjugates of original acridinium ester (AE) labels attached to antibodies and SAG2-GRA1-ROP1L chimeric antigen and shows that this test is useful for diagnostic purposes.

  14. Regulatory effects of intrinsic IL-10 in IgG immune complex-induced lung injury

    DEFF Research Database (Denmark)

    Shanley, T P; Schmal, H; Friedl, H P;

    1995-01-01

    injury. In the current study, we sought to determine whether endogenous IL-10 is playing a regulatory role in the lung inflammatory response. On the basis of lung mRNA and ELISA measurements, IL-10 induction was found during development of inflammation in the IgG immune complex model of lung injury...

  15. Aquaporin-4 IgG autoimmune syndrome and immunoreactivity associated with thyroid cancer

    DEFF Research Database (Denmark)

    Soelberg, Kerstin; Larsen, Stine Rosenkilde; Mørch, Marlene

    2016-01-01

    Tumor cells can express so-called onconeural antigens, which are normally restricted to mature neurons and glial cells in the CNS.1 The detection of neural-reactive immunoglobulin G (IgG) aids the diagnosis of paraneoplastic neurologic syndromes (PNS)1; however, the diagnostic utility and potenti...

  16. Increased RP105-Negative B Cells in IgG4-Related Disease.

    Science.gov (United States)

    Koarada, S; Tashiro, S; Nagao, N; Suematsu, R; Ohta, A; Tada, Y

    2013-01-01

    Four patients with IgG4-related disease (IgG4-RD) showed increased percentages of RP105-negative B cells in the peripheral blood. Case 1: A 66-year-old man having retroperitoneal fibrosis had 18.8% of RP105-negative B cells. Oral prednisolone improved the affected lesions and the percentage of RP105-negative B cells decreased (3.2%) after the treatment. Case 2: A 53-year-old man with retroperitoneal fibrosis had 27.9% of RP105-negative B cells. Case 3: A 38-year-old man with follicular hyperplasia showed increased percentage of RP105-negative B cells (8.3%). Case 4: A 60-year-old man with interstitial nephritis had 27.5% of RP105-negative B cells. The treatment decreased the numbers of RP105-negative B cells. Increased numbers of RP105-negatvie B cells is possibly associated with disease activity of IgG4-RD. Analysis of expression of RP105 on B cells may be helpful in evaluation of disease activity of IgG4-RD.

  17. Anti-amyloidogenic Activity of IgGs Contained in Normal Plasma

    Science.gov (United States)

    Williams, Angela D.; McWilliams-Koeppen, Helen P.; Acero, Luis; Weber, Alfred; Ehrlich, Hartmut; Schwarz, Hans P.; Solomon, Alan

    2010-01-01

    Introduction We have previously shown that a subpopulation of naturally occurring human IgGs has therapeutic potential for the amyloid-associated disorders. These molecules cross-react with conformational epitopes on amyloidogenic assemblies, including amyloid beta (Aβ) protein fibrils that are a pathological hallmark of Alzheimer’s disease. Materials and Methods Using our europium-linked immunosorbant assay, we established that ∼95% of 260 screened donor plasma samples had amyloid fibril-reactive IgGs and Aβ conformer-reactive IgGs with minimal binding to Aβ monomers. Anti-amyloidogenic reactivity was diverse and attributed to Aβ targeting multiple fibril-related binding sites and/or variations in multidentate binding. Results and Discussion There was no correlation between anti-fibril and anti-oligomer reactivity and donor age (19 to 60 years old) or gender. These findings demonstrate the inherent but diverse anti-amyloidogenic activity of natural IgGs contained in normal plasma. Conclusion Our studies provide support for investigating the clinical significance and physiological function of this novel class of antibodies. PMID:20405179

  18. Autoimmune hemolytic anemia, as part of Evans' syndrome, caused by cold reactive IgG autoantibodies

    NARCIS (Netherlands)

    Jaarsma, AS; Muis, N; DeGraaf, SSN

    1996-01-01

    We describe a boy with Evans' syndrome, consisting of immune thrombocytopenic purpura at age 2 and autoimmune hemolytic anemia (AIHA) at age 4. AIHA was caused by cold Ige autoantibodies. This is unusual because AIHA is generally associated with either warm IgG antibodies or cold IgM antibodies. Tre

  19. IgG antibodies in patients with pemphigus vulgaris before and after diagnosing with immunofluorescence.

    Science.gov (United States)

    Azimi, Hamideh; Majidi, Jafar; Estakhri, Rasul; Goldust, Mohamad

    2013-06-15

    Pemphigus is defined as a group of chronic self-immune vesicular diseases histologically recognized by inter-epidermic vesicles resulting from acantholysis. The aim of this study was to evaluate the precipitant and circulative IgG antibodies in patients with pemphigus vulgaris before and after treating with immunofluorescence. Sixty-two patients (34 females and 28 males) with clinically and pathologically confirmed P.V. were studied prospectively over a one year period of time during which direct and indirect immunofluorescent tests were performed before and after treatment. They had mild or moderate forms of disease. All patients received prednisolon 1-2 mg/kg/day and Azathioprine 2-3 mg/kg/day or methylpredisolon (1 g day(-1) for 4 days) and cyclophosphamide (500 mg/first day) pulse therapy due to general condition. Thirty- four females and 28 males enrolled, the mean age were 39.5 years (SD = 12.7). Before treatment, 10 and 52 cases were positive for skin depositing + or ++) and circulatory IgG (1/20 -1/60), respectively. Two to 3 month later, 37 were IgG positive with titers 1/20 to 1/160. The correlation between circulatory IgG before and after treatment was weakly positive (p = 0.05, r = 0.415). In the present study, treatment methods used for patients suffering from pemphigus vulgaris were not successful in significantly decreasing the circulative autoantibodies levels.

  20. Functionalization of SU-8 Photoresist Surfaces with IgG Proteins

    DEFF Research Database (Denmark)

    Blagoi, Gabriela; Keller, Stephan Urs; Johansson, Alicia;

    2008-01-01

    The negative epoxy-based photoresist SU-8 has a variety of applications within microelectromechanical systems (MEMS) and lab-on-a-chip systems. Here, several methods to functionalize SU-8 surfaces with IgG proteins were investigated. Fluorescent labeled proteins and fluorescent sandwich immunoass...

  1. Indigenous Greenlanders have a higher sero-prevalence of IgG antibodies to Helicobacter pylori than Danes

    DEFF Research Database (Denmark)

    Milman, Nils; Byg, Keld-Erik; Andersen, Leif P

    2003-01-01

    To assess the sero-prevalence of IgG antibodies to Helicobacter pylori (H. pylori) in Greenlanders and compare with the sero-prevalence in Caucasian Danes.......To assess the sero-prevalence of IgG antibodies to Helicobacter pylori (H. pylori) in Greenlanders and compare with the sero-prevalence in Caucasian Danes....

  2. The Contribution of Allergen-Specific IgG to the Development of Th2-Mediated Airway Inflammation

    Directory of Open Access Journals (Sweden)

    Jesse W. Williams

    2012-01-01

    Full Text Available In both human asthmatics and animal models of allergy, allergen-specific IgG can contribute to Th2-mediated allergic inflammation. Mouse models have elucidated an important role for IgG and Fc-gamma receptor (FcγR signaling on antigen presenting cells (APC for the induction of airway inflammation. These studies suggest a positive feedback loop between IgG produced by the adaptive B cell response and FcγR signaling on innate immune cells. Studies of IgG and FcγRs in humans with asthma or allergic lung disease have been more controversial. Some reports have identified associations between allergen-specific IgG and severity of allergic responses, while other studies have found associations of IgG subclass IgG4 with allergic tolerance. In this paper, we review the literature to help define the nature of IgG and FcγR signaling on innate immune cells and how it contributes to the development of allergic immune responses.

  3. Cross-sectional Serosurvey of Crimean-Congo Hemorrhagic Fever Virus IgG in Livestock, India, 2013-2014.

    Science.gov (United States)

    Mourya, Devendra T; Yadav, Pragya D; Shete, Anita M; Sathe, Padmakar S; Sarkale, Prasad C; Pattnaik, Bramhadev; Sharma, Gaurav; Upadhyay, Kamlesh J; Gosavi, Surekha; Patil, Deepak Y; Chaubal, Gouri Y; Majumdar, Triparna D; Katoch, Vishwa M

    2015-10-01

    We conducted a cross-sectional serosurvey of Crimean-Congo hemorrhagic fever (CCHF) among livestock in 22 states and 1 union territory of India. A total of 5,636 samples from bovines, sheep, and goats were screened for CCHF virus IgG. IgG was detected in 354 samples, indicating that this virus is widespread in this country.

  4. Inhibition of murine fibrocyte differentiation by cross-linked IgG is dependent on FcγRI.

    Science.gov (United States)

    Pilling, Darrell; Crawford, Jeffrey R; Verbeek, J Sjef; Gomer, Richard H

    2014-08-01

    Monocyte-derived, fibroblast-like cells, called fibrocytes, participate in wound-healing and the formation of fibrotic lesions. Aggregated or cross-linked IgG are key effectors in infections, autoimmune diseases, anaphylaxis, and immunotherapy. Cells, including monocytes and fibrocytes, bind IgG using FcγRs, and aggregated or cross-linked IgG inhibits fibrocyte differentiation. Mice have four different FcγRs, and which of these, if any, mediate the cross-linked IgG effect on fibrocyte differentiation is unknown. We find that in mice, deletion of FcγRI or the common signaling protein FcRγ significantly reduces the ability of cross-linked IgG or IgG2a to inhibit fibrocyte differentiation. Cells from FcγRIIb/III/IV KO mice are still sensitive to cross-linked IgG, whereas cells from FcγRI/IIb/III/IV KO mice are insensitive to cross-linked IgG. These observations suggest that IgG-mediated inhibition of fibrocyte differentiation is mediated by FcγRs, with FcγRI mediating most of the signaling.

  5. Development of fully automated determination of marker-specific immunoglobulin G (IgG) avidity based on the avidity competition assay format: application for Abbott Architect cytomegalovirus and Toxo IgG Avidity assays.

    Science.gov (United States)

    Curdt, Ingo; Praast, Gerald; Sickinger, Eva; Schultess, Jan; Herold, Iris; Braun, Hans Bertram; Bernhardt, Stephanie; Maine, Gregory T; Smith, Darwin D; Hsu, Stephen; Christ, Heike M; Pucci, Dominick; Hausmann, Michael; Herzogenrath, Jörg

    2009-03-01

    Determination of the avidity of immunoglobulin G (IgG) directed against a specific marker has become an established diagnostic tool for identifying or excluding acute infections with pathogens. A novel assay format termed AVIcomp (avidity competition based on mass action) circumventing the conventional chaotropic format has been developed for determination of the avidity of marker-specific IgG in patient specimens. Its applications for cytomegalovirus (CMV) and Toxoplasma gondii are presented. Specific high-avidity IgG from the patient specimen is selectively blocked using a soluble antigen in a sample pretreatment reagent, and the amount of remaining specific low-avidity IgG is determined relative to that in an untreated control. The comparison of the conventional chaotropic format, represented by the Radim CMV IgG Avidity assay, and the newly developed AVIcomp method, as exemplified by the Architect CMV IgG Avidity assay, on blood drawn within 4 months after seroconversion revealed a sensitivity of 100% (97.3% by an alternative calculation) for the AVIcomp format versus 87.5% (75.7% by an alternative calculation) for the chaotropic avidity assay. The specificity on 312 CMV IgG reactive and CMV IgM nonreactive specimens from pregnant women was 100% for the AVIcomp assay and 99.7% for the conventional avidity assay. The Architect Toxo IgG Avidity assay showed an agreement of 97.2% with the bioMérieux Vidas Toxo IgG Avidity Assay employing chaotropic reagents. These performance data suggest that the AVIcomp format shows superior sensitivity and equivalent specificity for the determination of IgG avidity to assays based on the chaotropic method and that the AVIcomp format may also be applicable to other disease states.

  6. Increased levels of IgG antibodies against human HSP60 in patients with spondyloarthritis.

    Directory of Open Access Journals (Sweden)

    Astrid Hjelholt

    Full Text Available Spondyloarthritis (SpA comprises a heterogeneous group of inflammatory diseases, with strong association to human leukocyte antigen (HLA-B27. A triggering bacterial infection has been considered as the cause of SpA, and bacterial heat shock protein (HSP seems to be a strong T cell antigen. Since bacterial and human HSP60, also named HSPD1, are highly homologous, cross-reactivity has been suggested in disease initiation. In this study, levels of antibodies against bacterial and human HSP60 were analysed in SpA patients and healthy controls, and the association between such antibodies and disease severity in relation to HLA-B27 was evaluated.Serum samples from 82 patients and 50 controls were analysed by enzyme-linked immunosorbent assay (ELISA for immunoglobulin (IgG1, IgG2, IgG3 and IgG4 antibodies against human HSP60 and HSP60 from Chlamydia trachomatis, Salmonella enteritidis and Campylobacter jejuni. Disease severity was assessed by the clinical scorings Bath Ankylosing Spondylitis Disease Activity Index (BASDAI, Bath Ankylosing Spondylitis Functional Index (BASFI and Bath Ankylosing Spondylitis Metrology Index (BASMI. Levels of IgG1 and IgG3 antibodies against human HSP60, but not antibodies against bacterial HSP60, were elevated in the SpA group compared with the control group. Association between IgG3 antibodies against human HSP60 and BASMI was shown in HLA-B27⁺ patients. Only weak correlation between antibodies against bacterial and human HSP60 was seen, and there was no indication of cross-reaction. These results suggest that antibodies against human HSP60 is associated with SpA, however, the theory that antibodies against human HSP60 is a specific part of the aetiology, through cross-reaction to bacterial HSP60, cannot be supported by results from this study. We suggest that the association between elevated levels of antibodies against human HSP60 and disease may reflect a general activation of the immune system and an increased

  7. The evaluation of rubella and sitomegalovirus IgG avidity tests in pregnants: four-year experience

    Directory of Open Access Journals (Sweden)

    Berrin Uzun

    2014-09-01

    Full Text Available Objective: In this study, we aim to evaluate the retrospective IgG avidity index (AI test results of the pregnant, who have applied to our hospital and had pregnancy screening test and have been asked for rubella and cytomegalovirus antibody tests and IgG AI test in 4 year period. Methods: Anti-rubella IgM, anti-rubella IgG, anti-CMV IgM and anti-CMV antibodies were performed by IMMULITE 2000XPi™ Immunoassay System (Siemens, Germany whereas IgG AI tests were performed by commercial kits of rubella and cytomegalovirus antibody tests (Dia.Pro® Diagnostic, Milano-Italy. Results: Between January 2010 and December 2013, 23 (7.32 % of 314 pregnant women tested rubella IgG AI had low AI, and 266 cases had high AI rate; 14 (17.28% of 81 pregnant women tested CMV IgG AI, had lower AI rate, 52 of them had high AI. 9 out of 23 pregnant women, who were detected low rubella were requested only AI without any IgM and IgG value; the IgG antibody of 13 pregnant was reactive, and IgM antibody was not requested; IgG and IgM antibody of 1 pregnant was detected positive. When 5 pregnant, who were detected low CMV AI were requested AI without IgG and IgM value; the IgG and IgM of 4 was reactive; 4 of them had IgG reactive but IgM negative; 1 had IgG and IgM negative. Conclusion: As a result, our low rubella AI rate has been detected lower than the rates in our country since our study population contains only the pregnant. Our low CMV AI rate varies due to the same reasons as literature data. During pregnancy scanning, performing of AI testing together with specific IgG and IgM will save both time and will be more meaningful in clinical evaluation for pregnant women. J Clin Exp Invest 2014; 5 (3: 420-423

  8. Association Between HLA Haplotypes and Increased Serum Levels of IgG4 in Patients With Primary Sclerosing Cholangitis.

    Science.gov (United States)

    Berntsen, Natalie L; Klingenberg, Olav; Juran, Brian D; Benito de Valle, Maria; Lindkvist, Björn; Lazaridis, Konstantinos N; Boberg, Kirsten Muri; Karlsen, Tom H; Hov, Johannes Roksund

    2015-05-01

    Increased serum levels of IgG4 have been reported in 9%-15% of patients with primary sclerosing cholangitis (PSC); it is not clear whether this increase contributes to pathogenesis. We performed genetic analyses of the HLA complex in patients with PSC from Norway, Sweden, and from the United States. We found an association between levels of IgG4 above the upper reference limit and specific HLA haplotypes. These patients had a significantly lower frequency of the strongest PSC risk factor, HLA-B*08, than patients without increased IgG4, and significantly higher frequencies of HLA-B*07 and HLA-DRB1*15. HLA genotype therefore might affect the serum concentration of IgG4, and increased IgG4 might be a marker of a distinct phenotype of PSC.

  9. Determination of Antibodies (IgG, IgM against Toxoplasma gondii in Patients with Cancer

    Directory of Open Access Journals (Sweden)

    M Pedram

    2007-08-01

    Full Text Available Background: The aim of this study was determination of antibodies (IgG, IgM against Toxoplasma in malignant patients in order to refer the patients on time to the physician for treatment.Methods: This study was carried out on 252 malignant patients and 252 healthy normal subjects (as control obtained from Shafa Hospital and Medical Diagnostic Laboratory (Iran-Zamin, in Ahwaz city. Patient's information was recorded in a questionnaire before sampling. Serum samples of patients were examined for IgG and IgM antibodies by ELISA technique using Trinity kits. Results: The results of this study revealed the presence of Toxoplasma antibodies in 114 (45.2% cases of patients who were positive for Toxoplasma IgG antibodies, and 26 (10.3% cases were confirmed to be positive for Toxoplasma IgM antibodies and also 17 (6.7% of cases had both IgG and IgM antibodies against Toxoplasma gondii. In control group 92 (36.5% cases and 15 (6% cases revealed seropositive for IgG and IgM antibodies, respectively. There were no significant differences between sex, close contact with cat, living region, chemotherapy, and seropositivity rate of toxoplasmosis in patients. Comparing the age groups, the highest seropositive rate showed in the age of 51 years or higher, and their rates had tendency to increase with age in both groups. No seropositivity significant relationship was found between patients and control group.Conclusion: According to the prevalence of positive cases in these patients, it is necessary to examine the patients for toxoplasmosis before, during and after chemotherapy.

  10. IgG, IgA, and lysozyme in Martina Franca donkey jennies and their foals.

    Science.gov (United States)

    Veronesi, Maria C; Dall'Ara, Paola; Gloria, Alessia; Servida, Francesco; Sala, Elisabetta; Robbe, Domenico

    2014-04-01

    Because immune transfer from jenny to donkey foal is mostly unknown, the aim of the present study was to evaluate, from 5 days before to 10 days after foaling, immunoglobulin (Ig)G, IgA, and lysozyme peripartal concentrations in serum and mammary secretions of 10 healthy, spontaneously foaling Martina Franca jennies and in serum of their mature, viable, healthy foals, in the first 10 days after birth. The results showed that, in jennies, mammary secretion of IgG levels (ranging between 16 and 75 mg/mL) and IgA (0.9-2 mg/mL), and IgG (6.8-13.5 mg/mL) and IgA (0.5-2.4 mg/mL) serum concentrations were not different along the time of study. Also, IgG concentrations in serum of foals did not show significant differences although a high level was observed at 12 hours after birth (8 mg/mL), and IgA concentrations in serum of foals did not show any significant difference, although a high level was observed at 12 hours after birth (1.2 mg/mL). Lysozyme increased significantly at Day 2 after parturition in mammary secretions of jennies (551.9 μg/mL) and at 12 hours in serum of foals (25.9 μg/mL). The study demonstrated that the pattern of passive immune transfer in donkey foals seems to be similar to that reported for the horse foal, with IgG predominating IgA in serum and mammary secretions of the jenny and also in serum of foals. The most significant early increase in foals' serum concerns lysozyme, which probably plays an important role in the innate immunity of the donkey foal in the first challenging hours after birth.

  11. Recent advances in the concept and pathogenesis of IgG4-related disease in the hepato-bilio-pancreatic system.

    Science.gov (United States)

    Okazaki, Kazuichi; Yanagawa, Masahito; Mitsuyama, Toshiyuki; Uchida, Kazushige

    2014-09-01

    Recent studies have proposed nomenclatures of type 1 autoimmune pancreatitis (AIP) (IgG4-related pancreatitis), IgG4-related sclerosing cholangitis (IgG4-SC), IgG4-related cholecystitis, and IgG4-related hepatopathy as IgG4-related disease (IgG4-RD) in the hepato-bilio-pancreatic system. In IgG4-related hepatopathy, a novel concept of IgG4-related autoimmune hepatitis (AIH) with the same histopathological features as AIH has been proposed. Among organs involved in IgG4-RD, associations with pancreatic and biliary lesions are most frequently observed, supporting the novel concept of "biliary diseases with pancreatic counterparts." Targets of type 1 AIP and IgG4-SC may be periductal glands around the bile and pancreatic ducts. Based on genetic backgrounds, innate and acquired immunity, Th2-dominant immune status, regulatory T (Treg) or B cells, and complement activation via a classical pathway may be involved in the development of IgG4-RD. Although the role of IgG4 remains unclear in IgG4-RD, IgG4-production is upregulated by interleukin 10 from Treg cells and by B cell activating factor from monocytes/basophils with stimulation of toll-like receptors/nucleotide-binding oligomerization domain-like receptors. Based on these findings, we have proposed a hypothesis for the development of IgG4-RD in the hepato-bilio-pancreatic system. Further studies are necessary to clarify the pathogenic mechanism of IgG4-RD.

  12. AL Amyloidosis

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    Desport Estelle

    2012-08-01

    Full Text Available Abstract Definition of the disease AL amyloidosis results from extra-cellular deposition of fibril-forming monoclonal immunoglobulin (Ig light chains (LC (most commonly of lambda isotype usually secreted by a small plasma cell clone. Most patients have evidence of isolated monoclonal gammopathy or smoldering myeloma, and the occurrence of AL amyloidosis in patients with symptomatic multiple myeloma or other B-cell lymphoproliferative disorders is unusual. The key event in the development of AL amyloidosis is the change in the secondary or tertiary structure of an abnormal monoclonal LC, which results in instable conformation. This conformational change is responsible for abnormal folding of the LC, rich in β leaves, which assemble into monomers that stack together to form amyloid fibrils. Epidemiology AL amyloidosis is the most common type of systemic amyloidois in developed countries with an estimated incidence of 9 cases/million inhabitant/year. The average age of diagnosed patients is 65 years and less than 10% of patients are under 50. Clinical description The clinical presentation is protean, because of the wide number of tissues or organs that may be affected. The most common presenting symptoms are asthenia and dyspnoea, which are poorly specific and may account for delayed diagnosis. Renal manifestations are the most frequent, affecting two thirds of patients at presentation. They are characterized by heavy proteinuria, with nephrotic syndrome and impaired renal function in half of the patients. Heart involvement, which is present at diagnosis in more than 50% of patients, leading to restrictive cardiopathy, is the most serious complication and engages prognosis. Diagnostic methods The diagnosis relies on pathological examination of an involved site showing Congo red-positive amyloid deposits, with typical apple-green birefringence under polarized light, that stain positive with an anti-LC antibody by immunohistochemistry and

  13. Concomitant occurrence of IgG4-related pleuritis and periaortitis: a case report with review of the literature.

    Science.gov (United States)

    Ishida, Mitsuaki; Hodohara, Keiko; Furuya, Aya; Fujishiro, Aya; Okuno, Hiroko; Yoshii, Miyuki; Horinouchi, Akiko; Shirakawa, Ayaka; Harada, Ayumi; Iwai, Muneo; Yoshida, Keiko; Kagotani, Akiko; Yoshida, Takashi; Okabe, Hidetoshi

    2014-01-01

    IgG4-related sclerosing disease is an established disease entity with characteristic clinicopathological features. Some recent reports have demonstrated that this disease can occur in the respiratory system including the pleura. Herein, we describe the first documented case of concomitant occurrence of IgG4-related pleuritis and periaortitis. A 71-year-old Japanese female with a history of essential thrombocythemia presented with persistent cough and difficulty in breathing. Computed tomography demonstrated thickening of the right parietal pleura, pericardium, and periaortic tissue and pleural and cardiac effusions. Histopathological study of the surgical biopsy specimen of the parietal pleura revealed marked fibrous thickening with lymphoplasmacytic infiltration. Phlebitis was noted, however, only a few eosinophils had infiltrated. Immunohistochemical study revealed abundant IgG4-positive plasma cell infiltration and high ratio of IgG4-/IgG-positive plasma cells (84%). Therefore, a diagnosis of IgG4-related pleuritis was made with consideration of the elevated serum IgG4 level (684 mg/dL). Recently, the spectrum of IgG4-related sclerosing disease has expanded, and this disease can occur in the pleura, pericardium, and periaortic tissue. Although histopathological analysis of the pericardium and periaortic tissue was not performed in the present case, it was suspected that thickening of the pericardium and periaortic tissue was clinically due to IgG4-related sclerosing disease. Our clinicopathological analyses of IgG4-related pleuritis and pericarditis reveal that this disease can present as dyspnea and pleural and pericardial effusion as seen in the present case, therefore, it is important to recognize that IgG4-related sclerosing disease can occur in these organs for accurate diagnosis and treatment.

  14. Neospora caninum antibodies in dairy cattle of Lages Municipality, Santa Catarina State, Brazil Anticuerpos séricos contra Neospora caninum en rebaños lecheros de la ciudad de Lages, Estado de Santa Catarina, Brasil

    Directory of Open Access Journals (Sweden)

    AB Moura

    2012-01-01

    Full Text Available Bovines are the main intermediary host of the protozoan Neospora caninum, which is a major cause of bovine abortions and neonatal mortality worldwide. Sera were collected from 373 dairy cattle and 33 dogs on 19 dairy farms in Lages city, Santa Catarina State, Brazil, to determine the prevalence of N. caninum antibodies and risk factors. Tests for N. caninum antibodies were done using an indirect immunofluorescent antibody test (IFAT. Positive reactions with titers ≥ 1:200 (cattle and ≥ 1:50 (dogs were found in 86 (23.1% and seven (21.2% bovines and dogs, respectively. Of the bovines, four (1.1% were calves, 33 (8.8% were heifers, 314 (84.2% were lactating cows, 19 (5.1% were dry cows and three (0.8% were bulls. Infection was primarily found in animals with low milk production (P = 0.008. The presence of seropositive dogs on the properties did not affect the prevalence of bovine infection. No correlation between bovine reproductive disorders and the prevalence of N. caninum antibodies was observed. Our results showed that N. caninum infection is widespread among dairy cattle of Lages, Santa Catarina.Los bovinos son los principales hospederos intermediarios del coccidio Neospora caninum. En esta especie se concentran la mayoría de los daños reproductivos. A fin de determinar la prevalencia de N. caninum e identificar factores de riesgo para la infección en el ganado lechero de la ciudad de Lages, Estado de Santa Catarina, se tomaron muestras de sangre de bovinos (n = 373 y los perros (n = 33 en 19 propiedades. La detección de anticuerpos contra N. caninum fue realizada por medio de IFA. Fueron consideradas positivas las muestras con títulos ≥ 200 (ganado bovino y ≥ 50 (perros. Informaciones relacionadas con la categoría de los animales, la raza, la frecuencia y tipo de trastornos de la reproducción, la producción de leche y la presencia de los perros fueron obtenidos mediante un cuestionario. Los datos fueron analizados con la

  15. Eficacia experimental de anticuerpos IgY producidos en huevos, contra el veneno de la serpiente peruana Bothrops atrox Experimental efficacy of IgY antibodies produced in eggs against the venom of the Peruvian snake Bothrops atrox

    Directory of Open Access Journals (Sweden)

    Julio C. Mendoza

    2012-03-01

    Full Text Available Objetivos. Desarrollar un protocolo de inmunización para producir inmunoglobulinas IgY de origen aviar contra el veneno de la serpiente peruana Bothrops atrox y evaluar la capacidad neutralizante. Materiales y métodos. Se inmunizaron seis gallinas de postura de la raza hy line brown con 500 μg/dosis de veneno de B. atrox en un periodo de dos meses. Cada semana, los huevos fueron colectados para el aislamiento de inmunoglobulinas IgY a partir de la yema, usando dos pasos consecutivos con αcido caprνlico y sulfato de amonio. La detecciσn de anticuerpos se realizσ por inmunodifusiσn doble mientras que el tνtulo y reactividad cruzada se determinaron por las técnicas de ELISA y Western blot. El cálculo de DL50 y de la DE50 del antiveneno IgY producido se realizó utilizando el método de Probits. Resultados. La masa de anticuerpos aislados fue de 8,5 ± 1,35 mg de IgY/mL de yema. Asimismo, la DE50 del antiveneno aviar fue calculada en 575 μL de antiveneno/mg de veneno. Adicionalmente, los ensayos de reactividad cruzada mostraron que el veneno de B. atrox comparte mas epνtopes comunes con el veneno de B. brazili (47% que con otros veneno del mismo género, en tanto que los venenos de Lachesis muta (19% y Crotalus durissus (12% mostraron una baja reactividad cruzada. Conclusiones. Se ha obtenido IgY purificada contra el veneno de B. atrox con capacidad neutralizante y se ha demostrado su utilidad como herramienta inmunoanalítica para evaluar la reactividad cruzada con venenos de otras especies.Objectives. To develop an immunization protocol in order to produce avian IgY immunoglobulins against Bothrops atrox Peruvian snake venom and to evaluate its neutralizing capacity. Materials and methods. Six Hy Line Brown hens were immunized each two weeks using 500μg/doses of B. atrox venom in a period of two months. Each week, eggs were collected for IgY isolation from yolk using two consecutive steps with caprilic acid and ammonium sulfate

  16. Efecto de la vacunación anti-leptospira en bovinos lecheros sobre la producción de anticuerpos anti-leptospira en trabajadores de lecherías de cuatro zonas de Costa Rica

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    Rafael González

    2007-07-01

    Full Text Available Objetivo: Este estudio experimental midió el efecto indirecto de la vacuna anti-Leptospira Leptoferm-5® (Pfizer® en la producción de anticuerpos anti-Leptospira en trabajadores de lecherías de cuatro zonas lecheras de Costa Rica. Materiales y Métodos: Tomaron parte en el estudio 171 vaqueros, 94 en el grupo tratamiento y 77 en el grupo control. A cada vaquero se le tomó una muestra sanguínea en tres diferentes momentos durante un año: la primera, antes de aplicar la vacuna en los animales, la segunda a los 6 meses y la tercera un año después de la primera vacunación. Se utilizó la técnica de micro aglutinación para la detección de anticuerpos anti-Leptospira interrogans serovares pomona, hardjo, canícola y grippotyphosa en el laboratorio del INCIENSA. Se utilizó la razón de prevalencias y el riesgo relativo para determinar si existió asociación entre la vacunación anti-Leptospira a las vacas y la seropositividad en los vaqueros. Resultados: En los tres muestreos se obtuvo un 10.27% (50/487 de muestras positivas a cualquiera de los serovares de Leptospira interrogans a los que fueron analizados. Tanto en el grupo tratamiento como en el control se observaron cambios en la seropositividad entre los distintos muestreos, con un aumento entre el primer y segundo muestreo (p Objective: This experimental study assessed the indirect effect of the anti-Leptospira vaccine Leptoferm-5® (Pfizer® regarding the production of anti-Leptospira antibodies in dairymen from four dairy areas in Costa Rica. Materials and Methods: 171 dairymen took part in the study; 94 in the treatment group and 77 in the control group. Three blood samples were taken from each worker three times throughout a year period: before the vaccination of the animals, and six and twelve months after the initial vaccination. The microscopic agglutination test (MAT was used to detect anti-Leptospira interrogans antibodies, specifically towards pomona, hardjo, canicola

  17. Comparison of Salivary Anti Helicobacter pylori IgG with Serum IgG and Bacteriological Tests in Detecting Helicobacter pylori Infections

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    H Ghasemian safaei

    2005-01-01

    Full Text Available Background: This study was conducted to compare the efficacy of enzyme-linked immunosorbent assay (ELISA for detecting anti-Helicobacter pylori (H. pylori specific IgG antibodies in specimens of oral fluid and serum with bacteriological tests. Methods: Antral biopsy specimens, as well as serum and oral fluid samples were collected from 97 patients who underwent upper gastrointestinal endoscopy. The presence or absence of current H. pylori infection was determined by culture, histology and urease detection. Anti-H. pylori specific IgG was detected in serum and oral fluid, using an established lab-made, and a commercial ELISA kit. The obtained data were compared with results of bacteriological tests. Results: In all, 62 (64% of 97 patients were positive for H. pylori by one or more of the gold standard tests (culture, histology and urease detection. Lab-made enzyme-linked immunoassay of oral fluid had a sensitivity and specificity of 92% and 83% respectively. A sensitivity and specificity of 87% and 83%, respectively, was obtained with the commercial kit. Lab-made enzyme-linked immunoassay of serum samples had a sensitivity and specificity of 90% and 88%, respectively. A sensitivity of 86% and specificity of 86% was obtained with the commercial kit. Conclusion: Detection of anti-H. pylori specific IgG in oral fluid by ELISA is comparable in sensitivity and specificity with serum based methods. Oral fluid based ELISA could provide a reliable, non-invasive method for the diagnosis of H. pylori infection. Saliva testing may have a role in epidemiological studies. Keywords: Helicobacter pylori, ELISA, Oral fluid

  18. Detección de bovinos portadores e inmunotolerantes al virus de la diarrea viral bovina en predios lecheros de la Región Metropolitana de Chile Identification of bovine viral diarrhoea virus in persistently infected immunotolerant cows in herds of the Region Metropolitana, Chile

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    M. CELEDON

    1998-01-01

    Full Text Available Se implementó una técnica para detectar la presencia de bovinos portadores e inmunotolerantes (PIT al virus de la diarrea viral bovina (VDVB, a través de la pesquisa de viremia persistente y bajos títulos de anticuerpos, para el VDVB, en dos muestras de sangre tomadas, desde un mismo animal, con tres meses de separación. La presencia de virus en la sangre se evidenció a través del aislamiento viral (AV -desde muestras de plasma y linfocitos- en cultivos primarios de testículo bovino y la identificación del supuesto aislado se efectuó por prueba de inmunoperoxidasa indirecta (IPI en el segundo pasaje del inóculo sobre las células. La detección de anticuerpos séricos se realizó por prueba de seroneutralización (SN, empleando la cepa citopatogénica Singer del VDVB. Se consideró animal PIT al que evidenció presencia de virus en las 2 muestras de sangre y mantuvo títulos de anticuerpos menores o iguales a 8. De 238 bovinos muestreados en 42 se detectó viremia persistente en ausencia o bajos títulos de anticuerpos, considerándose una prevalencia de 18% de bovinos PIT, y de los 34 predios muestreados en 22 se detectó la presencia de animales PIT, considerándose una prevalencia predial de 65%. Hubo diferencias significativas (p The presence of immunotolerant, persistently infected (IPI animals with bovine viral diarrhoea virus (BVDV was detected in several milking herds with abortions, repeat breeders, still births and poor growth rates, by the virus isolation test and measurement of serum neutralising antibodies, in 2 blood samples from each animal. Samples were taken 3 month apart. Virus isolation was done by inoculation of the plasma and lymphocytes from peripheral blood in primary bovine testicle cell culture. The isolates were identified, on the second serial passage, by the indirect immunoperoxidase test. Cows were considered IPI when BVDV was isolated in the two blood samples and serum title neutralising antibodies were

  19. Respuesta de anticuerpos inducidos por la vacuna antimeningocócica cubana VA-MENGOC-BC® frente a la cepa de Neisseria meningitidis B:4:P1.19,15 en adolescentes después de 12 años de inmunizados

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    María A. Camaraza

    2006-12-01

    Full Text Available Se estudió la respuesta de anticuerpos inducida por la vacuna antimeningocócica cubana VA-MENGOC-BC® contra la cepa de Neisseria meningitidis B:4:P1.19,15 mediante el Ensayo Bactericida del Suero (EBS y ELISA de tipo indirecto, para medir anticuerpos contra vesículas de membrana externa (VME de N. meningitidis B a 184 adolescentes de un politécnico de Ciego de Ávila que fueron inmunizados en campañas masivas 12 años antes. Se realizaron extracciones de sangre antes de aplicar la primera dosis (T0, 4 semanas después de ésta (T1 y 4 semanas después de la segunda dosis (T2. Transcurridos 12 años de esta vacunación el 42% de los adolescentes presentó títulos bactericidas ≥ 1:4 frente a la cepa homóloga (B:4:P1.19,15 y el 98% mostró anticuerpos detectables contra las VME. En el EBS; el porcentaje de seroconversión T1/T0 fue del 57% y T2/T0 del 60%. Mediante ELISA la seroconversión fue del 59% y 54%, respectivamente, por lo que se demostró que la aplicación de una sola dosis después de 12 años indujo una respuesta inmune importante que puede sugerir una respuesta anamnésica.

  20. Study of IgG subclass profiles of anti-HBs in populations with different HBV infection status.

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    Tsai, Tzu-Hsin; Huang, Chien-Fu; Wei, James Cheng-Chung; Ho, Mei-Shang; Wang, Lina; Tsai, Wei-Yu; Lin, Chien-Chou; Xu, Fang-Ling; Yang, Chi-Chiang

    2006-01-01

    To study IgG-specific subclasses of hepatitis B virus (HBV) surface antigen (anti-HBs), in different populations in Taiwan, a comparison was made between 104 chronic carriers (60 male and 44 female) and 439 recovered individuals (247 male and 192 female). Biochemical analyses of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) were also performed. Among the 104 chronic carriers, 21 patients had abnormal ALT and AST levels (> 25 IU/ml). When comparing the patients with abnormal ALT and AST levels to chronic carriers with normal ALT and AST levels, no statistical difference was observed for anti-HBs levels (p > 0.05). The IgG subclass pattern of the relative anti-HBs IgG subclass titers was IgG1 > IgG3 = IgG4 in both chronic carriers and recovered individuals (p anti-HBs antibody after HBV infection, in either chronic carriers or in HBV-cured individuals. This finding is partly inconsistent with data reported from other group who suggested in individuals naturally infected, the anti-HBs IgG consists mainly of IgG3 and IgG1. In contrast to that of our previous studies of anti-HBe and anti-HBc, the mean OD values of anti-HBs total IgG, and all IgG subclasses except for IgG2, of either males or females, were significantly higher in recovered individuals than in chronic carriers, while the mean OD values of anti-HBe and anti-HBc were significantly higher in chronic carriers than in recovered individuals (P anti-HBs in chronic carriers was not changed with liver inflammation and was independent of sex and age, except in individuals with abnormal ALT and AST for whom anti-HBs IgG1 was not significantly higher than IgG3 (p > 0.05), in spite of that whose mean O.D. value is higher.

  1. Dissecting the relationships of IgG subclasses and complements in membranous lupus nephritis and idiopathic membranous nephropathy

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    Na, Woong; Yi, Kijong; Park, Moon Hyang

    2017-01-01

    Membranous lupus nephritis (MLN) and idiopathic membranous nephropathy (IMN) are kidney diseases with similar morphology, but distinct etiologies, both producing glomeruli with immune deposits. Immunoglobulins and complements, the main components of the deposits, can be detected by immunofluorescence (IF) microscopy. Previous researches characterized the immune deposits only individually, but not the interactions between them. To study these relationships we analyzed an IF profile of IgG subclasses and complements (IgG1, IgG2, IgG3, IgG4, C3, C1q, and C4) in 53 and 95 cases of biopsy-confirmed MLNs and IMNs, respectively, mainly using information theory and Bayesian networks. We identified significant entropy differences between MLN and IMN for all markers except C3 and IgG1, but mutual information (a measure of mutual dependence) were not significantly different for all the pairs of markers. The entropy differences between MLN and IMN, therefore, were not attributable to the mutual information. These findings suggest that disease type directly and/or indirectly influences the glomerular deposits of most of IgG subclasses and complements, and that the interactions between any pair of the markers were similar between the two diseases. A Markov chain of IgG subclasses was derived from the mutual information about each pair of IgG subclass. Finally we developed an integrated disease model, consistent with the previous findings, describing the glomerular immune deposits of the IgG subclasses and complements based on a Bayesian network using the Markov chain of IgG subclasses as seed. The relationships between the markers were effectively explored by information theory and Bayesian network. Although deposits of IgG subclasses and complements depended on both disease type and the other markers, the interaction between the markers appears conserved, independent from the disease type. The disease model provided an integrated and intuitive representation of the

  2. Evaluation of cysticercus-specific IgG (total and subclasses) and IgE antibody responses in cerebrospinal fluid samples from patients with neurocysticercosis showing intrathecal production of specific IgG antibodies.

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    Suzuki, Lisandra Akemi; Rossi, Cláudio Lúcio

    2013-02-01

    In the present study, an enzyme-linked immunosorbent assay (ELISA) standardized with vesicular fluid of Taenia solium cysticerci was used to screen for IgG (total and subclasses) and IgE antibodies in cerebrospinal fluid (CSF) samples from patients with neurocysticercosis showing intrathecal production of specific IgG antibodies and patients with other neurological disorders. The following results were obtained: IgG-ELISA: 100% sensitivity (median of the ELISA absorbances (MEA)=1.17) and 100% specificity; IgG1-ELISA: 72.7% sensitivity (MEA=0.49) and 100% specificity; IgG2-ELISA: 81.8% sensitivity (MEA=0.46) and 100% specificity; IgG3-ELISA: 63.6% sensitivity (MEA=0.12) and 100% specificity; IgG4-ELISA: 90.9% sensitivity (MEA=0.85) and 100% specificity; IgE-ELISA 93.8% sensitivity (MEA=0.60) and 100% specificity. There were no significant differences between the sensitivities and specificities in the detection of IgG-ELISA and IgE-ELISA, although in CSF samples from patients with neurocysticercosis the MEA of the IgG-ELISA was significantly higher than that of the IgE-ELISA. The sensitivity and MEA values of the IgG4-ELISA were higher than the corresponding values for the other IgG subclasses. Future studies should address the contribution of IgG4 and IgE antibodies to the physiopathology of neurocysticercosis.

  3. Evaluation of cysticercus-specific IgG (total and subclasses and IgE antibody responses in cerebrospinal fluid samples from patients with neurocysticercosis showing intrathecal production of specific IgG antibodies

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    Lisandra Akemi Suzuki

    Full Text Available In the present study, an enzyme-linked immunosorbent assay (ELISA standardized with vesicular fluid of Taenia solium cysticerci was used to screen for IgG (total and subclasses and IgE antibodies in cerebrospinal fluid (CSF samples from patients with neurocysticercosis showing intrathecal production of specific IgG antibodies and patients with other neurological disorders. The following results were obtained: IgG-ELISA: 100% sensitivity (median of the ELISA absorbances (MEA=1.17 and 100% specificity; IgG1-ELISA: 72.7% sensitivity (MEA=0.49 and 100% specificity; IgG2-ELISA: 81.8% sensitivity (MEA=0.46 and 100% specificity; IgG3-ELISA: 63.6% sensitivity (MEA=0.12 and 100% specificity; IgG4-ELISA: 90.9% sensitivity (MEA=0.85 and 100% specificity; IgE-ELISA 93.8% sensitivity (MEA=0.60 and 100% specificity. There were no significant differences between the sensitivities and specificities in the detection of IgG-ELISA and IgE-ELISA, although in CSF samples from patients with neurocysticercosis the MEA of the IgG-ELISA was significantly higher than that of the IgE-ELISA. The sensitivity and MEA values of the IgG4-ELISA were higher than the corresponding values for the other IgG subclasses. Future studies should address the contribution of IgG4 and IgE antibodies to the physiopathology of neurocysticercosis.

  4. Detección de anticuerpos IgA y PCR como primeras opciones en el diagnóstico de infección perinatal por el VIH-1 IgA antibody detection and PCR as first options in the diagnosis of perinatal HIV-1 infection

    OpenAIRE

    Ma del Carmen Basualdo; Kathya Moran; Patricia Alcántara; Elizabeth González; Esteban Puentes; Carmen Soler

    2004-01-01

    OBJETIVO: Evaluar la sensibilidad y especificidad de la reacción en cadena de la polimerasa y de las pruebas de ELISA e inmunoblot para anticuerpos IgA específicos, como únicos métodos en el diagnóstico de infección perinatal del VIH-1. MATERIAL Y MÉTODOS: Estudio de evaluación comparativa, efectuado entre febrero y octubre de 2001 en la Unidad de Investigación en Retrovirus Humanos de la Universidad Nacional Autónoma de México. Se incluyeron 90 muestras de niños infectados y 153 de no infect...

  5. Production and Purification of a Polyclonal Antibody Against Purified Mouse IgG2b in Rabbits Towards Designing Mouse Monoclonal Isotyping Kits

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    Sadeq Eivazi

    2015-03-01

    Full Text Available Purpose: Mouse IgG subclasses containing IgG1, IgG2a, IgG2b and IgG3 have been defined and described both physiochemically and immunologically. Methods: Sepharose beads conjugated with protein A affinity chromatography was used for purification of mouse IgG2b. Sodium citrate buffer (0.1 M, pH: 3.5 was used for separation of mouse IgG2b. Verification of the purified fractions was monitored by SDS-PAGE (polyacrylamide gel electrophoresis in reducing condition. Immunized rabbit serum was collected and precipitated at the final concentration of 50% ammonium sulfate. After dialysis against tris-phosphate buffer (pH: 8.1 ion exchange chromatography column was used for purification of rabbit anti-mouse IgG2b. The periodate method was performed for conjugation with some variations. After conjugation, direct ELISA was used to determine the titer of HRP conjugated rabbit IgG against mouse IgG2b. Results: The titer of rabbit anti-mouse IgG2b that determined by ELISA was 32000. The purity of rabbit anti-mouse IgG2b was about 95%. The optimum dilution of prepared HRP conjugated IgG was 1:10000. This study showed that ion-exchange chromatography and affinity chromatography could be appropriate techniques for purification of mouse IgG and IgG subclasses respectively. Conclusion: This study showed that affinity chromatography could be an appropriate method for purification of IgG2b antibodies.

  6. The IgG avidity value for the prediction of Toxoplasma gondii infection in the amniotic fluid.

    Science.gov (United States)

    Tanimura, Kenji; Nishikawa, Akira; Tairaku, Shinya; Shinozaki, Nanae; Deguchi, Masashi; Morizane, Mayumi; Ebina, Yasuhiko; Morioka, Ichiro; Yamada, Hideto

    2015-09-01

    Primary Toxoplasma gondii (T. gondii) infection during pregnancy may lead to congenital toxoplasmosis. Maternal screening using T. gondii IgG avidity measurement and multiplex nested PCR was performed. The aim of this prospective cohort study was to determine a cut-off value of IgG avidity index (AI) for the prediction of the presence of T. gondii DNA in the amniotic fluid. One hundred thirty-nine women with positive or equivocal tests for IgM underwent both serum IgG avidity measurement and PCR analysis for the amniotic fluid. Nine had positive PCR results, and three of them were diagnosed as having congenital infection. A cut-off value of IgG AI was determined using receiver operating characteristic analysis. IgG AI (mean 13%) in women with positive PCR results was significantly lower than that (39%) in women with negative results. A cut-off value of amniotic fluid. None of women with IgG AI of ≥30% had a positive PCR result or congenital infection. This study firstly demonstrated that a cut-off value of 25-30% IgG AI might be useful for the prediction of the presence of T. gondii DNA in the amniotic fluid and congenital infection.

  7. A high number of IgG4-positive cells in gastric cancer tissue is associated with tumor progression and poor prognosis.

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    Miyatani, Kozo; Saito, Hiroaki; Murakami, Yuki; Watanabe, Joji; Kuroda, Hirohiko; Matsunaga, Tomoyuki; Fukumoto, Yoji; Osaki, Tomohiro; Nakayama, Yuji; Umekita, Yoshihisa; Ikeguchi, Masahide

    2016-05-01

    IgG4-related disease is a newly defined disease characterized by elevated serum IgG4 levels and infiltration of affected organs by IgG4-positive plasma cells. Recently, increased IgG4 levels were reported to be closely related with malignancy. To assess the relationship between IgG4 and the progression of gastric cancer, we immunohistochemically stained in this study gastric cancer tissue samples for IgG4-positive cells using an anti-IgG4 antibody. In addition, pre- and postoperative serum concentrations of IgG4 were measured, using an enzyme-linked immunosorbent assay. In gastric cancer samples, the number of CD138-positive plasma cells was significantly lower and the number of IgG4-positive cells significantly higher than in non-cancerous gastric mucosa. The number of IgG4-positive cells was significantly correlated with gross tumor appearance, tumor depth, lymph node metastasis, venous invasion, and lymphatic invasion. Prognosis was significantly poorer in patients with a high number of IgG4-positive cells than in those with a low number. Multivariate analysis indicated that both the number of IgG4-positive cells and the depth of tumor invasion were independently prognostic of survival. In conclusion, in gastric cancer, the number of IgG4-positive cells is increased and this is closely associated with gastric cancer progression.

  8. Indicación de la determinación de los anticuerpos para los virus de la hepatitis C y de la hepatitis A en los protocolos de atención a los niños inmigrantes Indication of determination of antibodies against hepatitis C and A viruses in the protocol for the care of young immigrants

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    Rosa M. Masvidal Aliberch

    2010-08-01

    Full Text Available Objetivo: Valorar la determinación sistemática de los anticuerpos para el virus de la hepatitis C (Ac. VHC y para el virus de la hepatitis A (Ac. VHA dentro de los protocolo de atención a niños inmigrantes (PANI. Métodos: Estudio descriptivo, transversal y multicéntrico. Se determinaron los Ac. VHC y Ac.VHA, en niños de 6 meses a 15 años procedentes de países de baja renta que habían inmigrado hacía menos de 12 meses. Se registró la edad, el sexo y el país de origen. Se ha comparado el coste de la vacunación (con vacuna HA y vacuna HA-HB, precio de sanidad pública y precio de venta al público a todos los niños inmigrantes sin cribado, con el coste de la vacunación sólo a los no inmunes. Resultados: Se determinaron los Ac. VHC a 1055 niños/as, un caso resultó positivo: 0,09% (IC95%: 0-0,53%. Se determinaron los Ac. VHA a 992 niños/as, y fueron positivos el 38% (IC 95%: 35,0-41,1; en los de América Central y del Sur (n=352 el 34,9%; del Magreb (n=246 el 44,7%; de Indo-Pakistán (n=162 el 58,6%. Según el país de procedencia, la edad y el precio de la vacuna utilizada, es eficiente la determinación de los Ac. VHA previamente a la vacunación para el VHA. Conclusiones: La baja prevalencia de Ac. VHC en población infantil inmigrada no justifica su determinación sistemática. Valorar la determinación de los Ac. VHA en cada niño inmigrante en particular puede aumentar la eficiencia de los PANI.Objectives: To evaluate systematic determination of antibodies against hepatitis C virus (HCV and hepatitis A virus (HAV within the protocols for the care of young immigrants (PCYI. Methods: We performed a descriptive, cross-sectional, multicenter study. Antibodies against HCV and HAV were determined in children aged from 6 months to 15 years from low-income countries who had immigrated to Spain less than 12 months previously. Age, sex and country of origin were registered. The cost of vaccinating all immigrant children (with the HA

  9. IgG4-related kidney disease: MRI findings with emphasis on the usefulness of diffusion-weighted imaging

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    Kim, Bohyun; Kim, Jin Hee, E-mail: kimjhrad@amc.seoul.kr; Byun, Jae Ho; Kim, Hyoung Jung; Lee, Seung Soo; Kim, So Yeon; Lee, Moon-Gyu

    2014-07-15

    Objectives: To investigate the imaging findings of immunoglobulin G4 (IgG4)-related kidney disease (IgG4-KD) on magnetic resonance imaging (MRI) including diffusion-weighted imaging (DWI) and to evaluate the usefulness of DWI in lesion detection. Methods: This retrospective cohort study included 31 patients with IgG4-KD who underwent MRI covering both kidneys. Two radiologists reviewed in consensus the MR images to determine the distribution pattern (location, laterality, and multiplicity) and the visually assessed signal intensity (hypointense, isointense or hyperintense) of the renal lesions compared to the normal renal parenchyma on each sequence. Per-patient sensitivity for detecting IgG4-KD and the number of detectable lesions were compared in T2-weighted images, DWI, and dynamic contrast-enhanced images. Results: IgG4-KD typically manifested as bilateral (83.9%), multiple (93.5%), and renal parenchymal (87.1%) nodules appearing isointense (93.5%) on T1-weighted images, hypointense (77.4%) on T2-weighted images, hyperintense (100%) on DWI (b = 1000), and hypointense (83.3%) in the arterial phase and with a progressive enhancement pattern on dynamic contrast-enhanced images. The sensitivity of DWI for detecting IgG4-KD was significantly higher than that of T2-weighted images (100% vs. 77.4%, P = 0.034). The median number of detectable lesions was significantly greater in DWI (n = 9) than in T2-weighted images (n = 2) and dynamic contrast-enhanced images (n = 5) (P ≤ 0.008). Conclusions: The characteristic MRI findings of IgG4-KD were bilateral, multiple, renal parenchymal nodules with T2 hypointensity, diffusion restriction, and a progressive enhancement pattern. As DWI was useful in the detection of IgG4-KD, adding DWI to conventional MRI for patients suspected of having IgG4-KD may enhance the diagnosis.

  10. Hepatitis C viremia is associated with cytomegalovirus IgG antibody levels in HIV-infected women.

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    Mark H Kuniholm

    Full Text Available BACKGROUND: Individuals with HIV infection exhibit high cytomegalovirus (CMV IgG levels, but there are few data regarding the association of hepatitis C virus (HCV with the immune response against CMV. METHODS: Associations of HCV with CMV seropositivity and CMV IgG levels were studied in 635 HIV-infected women, 187 of whom were HCV-seropositive, with adjustment in multivariable models for age, race/ethnicity, and HIV disease characteristics. Eighty one percent of the women reported receipt of highly active antiretroviral therapy (HAART prior to or at CMV testing. RESULTS: In adjusted models women with chronic HCV had higher CMV IgG levels than those without HCV RNA (β = 2.86, 95% CI:0.89 - 4.83; P = 0.004. The association of HCV RNA with CMV IgG differed by age (P(interaction = 0.0007, with a strong association observed among women in the low and middle age tertiles (≤ 45.3 years of age; β = 6.21, 95% CI:3.30 - 9.11, P<0.0001 but not among women in the high age tertile. CMV IgG levels were not associated with non-invasive measures of liver disease, APRI and FIB-4, or with HCV RNA level and adjustment for Epstein-Barr virus (EBV IgG levels did not affect the association between HCV and CMV. CONCLUSIONS: CMV IgG levels are higher in HCV/HIV co-infected women than in HIV mono-infected women. Further research on the association of HCV with CMV IgG is indicated because prior studies have found CMV IgG to be associated with morbidity and mortality in the general population and subclinical carotid artery disease in HIV-infected patients.

  11. Persistent Low Toxoplasma IgG Avidity Is Common in Pregnancy: Experience from Antenatal Testing in Norway.

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    Gry Findal

    Full Text Available The parasite Toxoplasma gondii might harm the fetus if a woman is infected during pregnancy. IgG seroconversion and significant increase in IgG antibody amount in pregnancy indicates maternal infection. Presence of toxoplasma immunoglobulin M (IgM, immunoglobulin G (IgG and low IgG avidity in a single serum sample indicates possible maternal infection, but positive toxoplasma IgM and low IgG avidity may persist for months and even years. We aimed to evaluate avidity development during pregnancy in a retrospective study. Serial blood samples from 176 pregnant women admitted to Oslo University Hospital 1993-2013 for amniocentesis because of suspected toxoplasma infection were included. Data were obtained from journals and laboratory records. The avidity method used was based on Platelia Toxo IgG assay. Mean maternal age at first serology was 29.9 years (SD 5.2, range 18-42. In 37 (21% women only the avidity increased from low to high in < 3 months. In 139 (79% the IgG avidity remained below the high threshold ≥ 3 months and within this group 74 (42% women had stable low IgG avidity during the observation period. Median gestational age at first test was 10.6 weeks (range 4.6-28.7. Fetal infection was detected in four children, but none among children whose mother had stable low IgG avidity. The first antenatal toxoplasma serology should ideally be collected in early pregnancy and if stable values of toxoplasma IgM and low IgG-avidity are detected in a second sample after three to four weeks, the need for amniocentesis can be questioned.

  12. Decreased HHV-6 IgG in Alzheimer’s Disease

    Science.gov (United States)

    Westman, Gabriel; Blomberg, Jonas; Yun, Zhibing; Lannfelt, Lars; Ingelsson, Martin; Eriksson, Britt-Marie

    2017-01-01

    Human herpesviruses have previously been implicated in the pathogenesis of Alzheimer’s disease (AD) but whether they are causal, facilitating, or confounding factors is yet to be established. A total of 50 AD subjects and 52 non-demented (ND) controls were analyzed in a multiplex assay for IgG reactivity toward herpes simplex virus (HSV), varicella zoster virus (VZV), cytomegalovirus (CMV), and human herpesvirus 6 (HHV-6). The HHV-6 IgG reactivity was significantly lower in AD subjects compared to ND controls, whereas there were no differences in HSV, VZV, or CMV antibody levels between the groups. Analysis of peripheral blood mononuclear cells with a subtype-specific HHV-6 PCR revealed no signs of reactivation, as AD and ND subjects presented with comparable HHV-6 DNA levels in PBMCs, and all positive samples were of subtype B. Whether HHV-6 is a factor in AD remains to be elucidated in future studies. PMID:28265256

  13. Unique features of monoclonal IgG2b in the cleavage reaction with pepsin.

    Directory of Open Access Journals (Sweden)

    Sumii,Hiroshi

    1989-06-01

    Full Text Available Preparations of IgG2b purified from several mouse hybridoma clones were highly susceptible, compared to other subclasses, to peptic digestion under conditions usually used to prepare F (ab'2 fragments. Analyses of the digestion products revealed that no F (ab'2 was produced and that the main product was a Fab-like fragment. Demonstration of the hinge disulfides in the Fc portion clearly indicated that in IgG2b the primary peptic cleavage occurs on the NH2-terminal side of the inter-heavy chain disulfide bridge. The resulting Fab failed to bind with antigen, suggesting the importance of the CH1-hinge region in maintaining the native conformation of the antigen-binding site.

  14. IgG platelet antibodies in EDTA-dependent pseudothrombocytopenia bind to platelet membrane glycoprotein IIb.

    Science.gov (United States)

    Fiorin, F; Steffan, A; Pradella, P; Bizzaro, N; Potenza, R; De Angelis, V

    1998-08-01

    EDTA-dependent pseudothrombocytopenia (PTCP) consists of an inappropriate low platelet count caused by autoantibodies present in the serum samples reacting with platelets only in EDTA-anticoagulated blood. By using immunoprecipitation and Western blot techniques, we studied the immunochemical specificity of platelet agglutinating autoantibodies in the serum samples of 10 patients with PTCP. Furthermore, to evaluate a possible role of PTCP-associated IgG autoantibodies in increased platelet turnover, we assayed the plasma glycocalicin (GC) level and calculated the GC index for every patient. Our results provide direct evidence that an epitope located on platelet membrane glycoprotein IIb is recognized by PTCP-associated IgG antibodies; moreover GC levels in patients with EDTA-dependent PTCP were similar to control levels, thus excluding an increased platelet turnover. We conclude that antiplatelet antibodies directed against platelet cryptantigens are unlikely to have a major role in the increased removal of cells from circulation.

  15. Steroid-responsive IgG4-related disease with isolated prostatic involvement: An unusual presentation with elevated serum PSA

    Directory of Open Access Journals (Sweden)

    Vikas Jain

    2016-01-01

    Full Text Available Autoimmune prostatitis is known to occur as a part of multisystem fibro-inflammatory disorder known as IgG4 related disease (IgG4 RD. The usual presentation is with symptoms of gastro-intestinal disease with prostatic involvement presenting as lower urinary tract symptoms. The disease responds to corticosteroids. We report an asymptomatic young man who was diagnosed to have IgG4 related prostatitis on TRUS-guided prostate biopsy done for elevated serum PSA, in the absence of any other systemic involvement. The treatment with steroid resulted in normalization of S PSA levels.

  16. Paraneoplastic autoimmune optic neuritis with retinitis defined by CRMP-5-IgG.

    Science.gov (United States)

    Cross, Shelley A; Salomao, Diva R; Parisi, Joseph E; Kryzer, Thomas J; Bradley, Elizabeth A; Mines, Jonathan A; Lam, Byron L; Lennon, Vanda A

    2003-07-01

    Autoantibodies have defined two paraneoplastic visual disorders related to small-cell lung carcinoma: retinopathy ("CAR"-IgG [23kDa, recoverin]) and optic neuritis collapsin response-mediated protein 5 (CRMP-5-IgG [62kDa]). Among 16 patients with CRMP-5-IgG and optic neuritis (aged 52-74 years; all smokers, 9 women), we documented coexisting retinitis in 5. None had CAR-IgG. Fifteen had subacute vision loss, swollen optic discs, and field defects. Vascular leakage was evident at and remote from the disc; 5/5 tested had abnormal electroretinograms. Nine had striking vitreous cells. Vitrectomy showed reactive lymphocytosis (4/4), predominantly CD4(+) (1/1). Most patients had multifocal neurological accompaniments. Cerebrospinal fluid contained lymphocytes (7-32), elevated protein, multiple oligoclonal immunoglobulin bands, and CRMP-5-IgG. Three patients superficially resembled Devic's disease at presentation. One autopsied patient had predominantly CD8(+) T lymphocytes infiltrating optic nerve and spinal cord. Eleven patients had confirmed small-cell carcinoma; 1 had imaging evidence of lung cancer; 3 had renal or thyroid carcinoma. Full-length CRMP-5 protein was identified in normal retina and optic nerve by Western blot analyses. Photoreceptor cells, retinal ganglion cells, and nerve fibers exhibited CRMP-5-specific immunoreactivity. In summary, CRMP-5-IgG defines a paraneoplastic ophthalmological entity of combined optic neuritis and retinitis with vitreous inflammatory cells. Positive serology obviates the need for vitreous biopsy and expedites the search for cancer.

  17. A prominent lack of IgG1-Fc fucosylation of platelet alloantibodies in pregnancy.

    Science.gov (United States)

    Kapur, Rick; Kustiawan, Iwan; Vestrheim, Anne; Koeleman, Carolien A M; Visser, Remco; Einarsdottir, Helga K; Porcelijn, Leendert; Jackson, Dave; Kumpel, Belinda; Deelder, André M; Blank, Dennis; Skogen, Björn; Killie, Mette Kjaer; Michaelsen, Terje E; de Haas, Masja; Rispens, Theo; van der Schoot, C Ellen; Wuhrer, Manfred; Vidarsson, Gestur

    2014-01-23

    Immunoglobulin G (IgG) formed during pregnancy against human platelet antigens (HPAs) of the fetus mediates fetal or neonatal alloimmune thrombocytopenia (FNAIT). Because antibody titer or isotype does not strictly correlate with disease severity, we investigated by mass spectrometry variations in the glycosylation at Asn297 in the IgG Fc because the composition of this glycan can be highly variable, affecting binding to phagocyte IgG-Fc receptors (FcγR). We found markedly decreased levels of core fucosylation of anti-HPA-1a-specific IgG1 from FNAIT patients (n = 48), but not in total serum IgG1. Antibodies with a low amount of fucose displayed higher binding affinity to FcγRIIIa and FcγRIIIb, but not to FcγRIIa, compared with antibodies with a high amount of Fc fucose. Consequently, these antibodies with a low amount of Fc fucose showed enhanced phagocytosis of platelets using FcγRIIIb(+) polymorphonuclear cells or FcγRIIIa(+) monocytes as effector cells, but not with FcγRIIIa(-) monocytes. In addition, the degree of anti-HPA-1a fucosylation correlated positively with the neonatal platelet counts in FNAIT, and negatively to the clinical disease severity. In contrast to the FNAIT patients, no changes in core fucosylation were observed for anti-HLA antibodies in refractory thrombocytopenia (post platelet transfusion), indicating that the level of fucosylation may be antigen dependent and/or related to the immune milieu defined by pregnancy.

  18. Comparison of chemiluminescent immunoassay and ELISA for measles IgG and IgM.

    Science.gov (United States)

    de Ory, Fernando; Minguito, Teodora; Balfagón, Pilar; Sanz, Juan C

    2015-08-01

    In the context of measles elimination, the identification of recent infections is important for clinical laboratories. Serological diagnosis is achieved by detecting specific IgG and IgM. Recently an automated chemiluminescent immunoassay (CLIA) (Liaison, DiaSorin, Italy) has been used to quantify the measles antibody. The aim of this study was to compare this assay with Enzygnost ELISA (Siemens, Germany), with final classification of discrepancies by indirect immunofluorescence (Euroimmun, Germany). For measles IgM, 204 sera were analyzed: 50 IgM-positive, 104 IgM-negative/IgG-positive, and 50 from other viral infections (B19V, rubella, mumps, CMV, and EBV). For the measles IgG assay, 162 samples were tested: 106 were positive and 56 were negative. For measles IgM, the sensitivity and specificity of CLIA against ELISA were 94% (95% CI: 83.2-98.6) and 100% (95% CI: 97.1-100), respectively; the corrected figures after the final classification of discrepancies were 100% (95% CI: 91.0-100) and 99.4% (95% CI: 96.1-100), respectively. In relation to IgG, the sensitivity and specificity of CLIA against ELISA were, respectively, 97.2% (95% CI: 91.7-99.4) and 92.9% (95% CI: 82.5-97.7), and 95.5% (95% CI: 89.5-98.3) and 100% (95% CI: 91.8-100) after the final classification. CLIA showed excellent sensitivity and specificity in detecting measles IgG and IgM antibodies, eliminating the need to aliquot specimens before carrying out the assay.

  19. Serum IgG antibody levels to periodontal microbiota are associated with incident Alzheimer disease.

    Directory of Open Access Journals (Sweden)

    James M Noble

    Full Text Available Periodontitis and Alzheimer disease (AD are associated with systemic inflammation. This research studied serum IgG to periodontal microbiota as possible predictors of incident AD.Using a case-cohort study design, 219 subjects (110 incident AD cases and 109 controls without incident cognitive impairment at last follow-up, matched on race-ethnicity, were drawn from the Washington Heights-Inwood Columbia Aging Project (WHICAP, a cohort of longitudinally followed northern Manhattan residents aged >65 years. Mean follow-up was five years (SD 2.6. In baseline sera, serum IgG levels were determined for bacteria known to be positively or negatively associated with periodontitis (Porphyromonas gingivalis, Tannerella forsythia, Actinobacillus actinomycetemcomitans Y4, Treponema denticola, Campylobacter rectus, Eubacterium nodatum, and Actinomyces naeslundii genospecies-2. In all analyses, we used antibody threshold levels shown to correlate with presence of moderate-severe periodontitis.Mean age was 72 years (SD 6.9 for controls, and 79 years (SD 4.6 for cases (p640 ng/ml, present in 10% of subjects was associated with increased risk of AD (HR = 2.0, 95%CI: 1.1-3.8. This association was stronger after adjusting for other significant titers (HR = 3.1, 95%CI: 1.5-6.4. In this model, high anti-E. nodatum IgG (>1755 ng/ml; 19% of subjects was associated with lower risk of AD (HR = 0.5, 95%CI: 0.2-0.9.Serum IgG levels to common periodontal microbiota are associated with risk for developing incident AD.

  20. IgG4-related Sclerosing Mesenteritis in a 7-year-old Saudi Girl

    OpenAIRE

    Hasosah, Mohammed Y.; Satti, Mohamed B.; Yousef, Yasmin A.; Alzahrani, Daifullah M.; Almutairi, Sajdi A.; Ashraf F Alsahafi; Sukkar, Ghassan A.; Alzaben, Abdullah A.

    2014-01-01

    Sclerosing mesenteritis (SM) is a rare, benign inflammatory disorder of unknown etiology, affecting the membranes of the digestive tract that involves lymphoplasmacytic inflammation, fat necrosis, and fibrosis of the mesentery. We report a child patient with a history of recurrent abdominal pain and fever who was found to have an intra-abdominal mass suspicious for malignancy. A tissue biopsy revealed the diagnosis of SM associated with IgG4-related systemic disease. The patient is currently ...

  1. Detection of IgG antibodies against Bordetella pertussis with /sup 125/I-protein A

    Energy Technology Data Exchange (ETDEWEB)

    Wirsing von Koenig, C.H.; Finger, H.

    1981-01-01

    A method for the detection of IgG antibodies against Bordetella pertussis is described, based on the principle of 'sandwich' radioimmunoassay. /sup 125/I protein A is used as radioactive tracer. The influence of amounts of antigen, antibody, radioactive tracer, incubation time and temperature were tested and the optimal conditions for the assay are described. The procedure offers a simple, quick, and sensitive method for detecting antibodies against B. pertussis. Application and limitation of the test are discussed.

  2. Immunogenicity of Isogenic IgG in Aggregates and Immune Complexes

    Science.gov (United States)

    St. Clair, J. Benjamin; Detanico, Thiago; Aviszus, Katja; Kirchenbaum, Greg A.; Christie, Merry; Carpenter, John F.

    2017-01-01

    A paradox in monoclonal antibody (mAb) therapy is that despite the well-documented tolerogenic properties of deaggregated IgG, most therapeutic IgG mAb induce anti-mAb responses. To analyze CD4 T cell reactions against IgG in various physical states, we developed an adoptive transfer model using CD4+ T cells specific for a Vκ region-derived peptide in the hapten-specific IgG mAb 36–71. We found that heat-aggregated or immune complexes (IC) of mAb 36–71 elicited anti-idiotypic (anti-Id) antibodies, while the deaggregated form was tolerogenic. All 3 forms of mAb 36–71 induced proliferation of cognate CD4+ T cells, but the aggregated and immune complex forms drove more division cycles and induced T follicular helper cells (TFH) development more effectively than did the deaggregated form. These responses occurred despite no adjuvant and no or only trace levels of endotoxin in the preparations. Physical analyses revealed large differences in micron- and nanometer-sized particles between the aggregated and IC forms. These differences may be functionally relevant, as CD4+ T cell proliferation to aggregated, but not IC mAb 36–71, was nearly ablated upon peritoneal injection of B cell-depleting antibody. Our results imply that, in addition to denatured aggregates, immune complexes formed in vivo between therapeutic mAb and their intended targets can be immunogenic. PMID:28114383

  3. Elevated Serum IgG4 Defines Specific Clinical Phenotype of Rheumatoid Arthritis

    Directory of Open Access Journals (Sweden)

    Le-Feng Chen

    2014-01-01

    Full Text Available Objectives. To explore the correlation of serum IgG4 (sIgG4 with clinical manifestations or therapeutic response in rheumatoid arthritis (RA. Methods. Consecutive 136 RA patients were recruited and followed up at regular interval. SIgG4 was detected by immunonephelometry. Serial synovial tissue sections from 46 RA patients were stained immunohistochemically for IgG4. Results. Forty-six percent of 136 RA patients had elevated sIgG4. Patients with elevated sIgG4 had higher sIgG4/sIgG ratio, C-reactive protein, erythrocyte sedimentation rate, rheumatoid factor, and anticyclic citrullinated peptide antibodies than those with normal sIgG4 (all P<0.05. Among 45 patients who received methotrexate and leflunomide therapy, 50% (9/18 of patients with elevated sIgG4 and 85% (23/27 of patients with normal sIgG4 reached therapeutic target (disease activity score of 28 joints < 3.2 at 6-month visit (χ2=6.508, P=0.011. IgG4-positive plasma cell count correlated positively with sIgG4, total synovitis score, and CD3-, CD20-, and CD38-positive cell counts (all P<0.05. Conclusions. Our results showed that elevated sIgG4 in RA is common and disproportional to total IgG and RA with elevated sIgG4 may be a specific clinical phenotype with higher disease activity, higher level of autoantibodies, and poor response to methotrexate and leflunomide therapy.

  4. Toxocara Canis IgG Seropositivity in Patients with Chronic Urticaria

    Directory of Open Access Journals (Sweden)

    Mehmet Burak-Selek

    2015-10-01

    Full Text Available We aimed to investigate IgG antibody levels specific to Toxocara canis (T. canis, a parasite which subsists in dog’s intestine, on serum samples obtained from patients with chronic urticaria (CU to evaluate effective risk in CU etiopathogenesis.In this study, 73 patients diagnosed with CU and 109 healthy individuals as control group, were included. Various factors such as sex, age, education and income, daily hand washing habits, history of dog owning and soil eating were questioned in patient anamnesis. T. canis IgG antibodies were detected using an enzyme linked immunosorbent assay (ELISA kit prepared with T. canis larval excretory-secretory antigens. Positive results were confirmed with western blot (WB WB test.We found T. canis IgG positivity in 17.8% (n=13 of patients (n=73 with CU. But we did not observe any T. canis IgG positivity in healthy controls (n=109. Low molecular weight bands (24-35 kDa were observed in 11 samples in WB analyses while two of the samples were weakly positive. It is revealed that dog owning history increases T. canis seropositivity12.9 times while insufficient daily hand washing habit (less than six times a day increasesseropositivity 20.7 times. Our study showed that T. canis may trigger CU since we found17.8% seropositivity in 73 patients with CU and none in 109 healthy individuals.Moreover, various socio-demographic characteristics have been shown to affect T. canisseropositivity in patients with CU. 

  5. Seroprevalence of diphtheria toxoid IgG antibodies in children, adolescents and adults in Poland

    OpenAIRE

    Zasada, Aleksandra A.; Rastawicki, Waldemar; Rokosz, Natalia; Jagielski, Marek

    2013-01-01

    Background Recommendations for diphtheria immunization are to apply an effective primary immunization in infancy and to maintain immunity throughout life. Immunity against diphtheria depends primarily on antibody to the diphtheria toxin. This study evaluated the seroprevalence of IgG diphtheria antitoxin in sera of healthy children, adolescents and adults in Poland. Methods A total of 1387 serum samples collected between 2010 and 2012 from individuals with ages ranging from 1 month to 85 year...

  6. ROLE OF LECTIN-SUBSTRANCE RECOGNITION IN IMMUNOREGULATORY INTERACTION BETWEEN INTERLEUKIN-2 IGG

    Directory of Open Access Journals (Sweden)

    S. M. Sobolev

    2010-01-01

    Full Text Available As assessed by decreased response of ConA-induced blasts to IL-2, a staphylococcal protein A was shown to extract IL-2 from cultural medium after its preincubation with IgG, but it did not bind pure IL-2. Normal human immunoglobulin inhibits reaction of DTH effectors to Listeria antigen, which is also IL-2-dependent. An immunomodulating drug Phosprenyl (sodium polyprenylphosphate abolishes the inhibitory ffect of immunoglobulin. Since Phosprenyl (as shown earlier interacts with alpha-chain of rIL-2 and blocks IL-2 activity, the two drugs are in competitive relations. The latter may be explained by identities in prostetic carbohydrate groups of the both glycoproteins (CD25 and immunoglobulin, whereas Phosprenyl and IL-2 would behave like as lectins. These results characterize local conditions and mechanisms of immune regulation under tissue domination of gamma-globulin or antibodies of a given isotype. IgG binds with IL-2, reacting not with an active center but with effector region of IgG molecule, thus blocking IL-2 activity. Since a similar effect is observed under in vivo conditions (in a DTH model, the phenomenon revealed may explein inhibition of immune response after passive injection of antibodies, as well as a feed-back relationship between humoral and cellular immunity. Inhibition of IL-2 biological activity after its interaction with IgG and immune complexes may be considered as a universal mechanism of immune regulation performed by a feedback regulation, which may be influenced by means of Phosprenyl-like immunomodulators. In some infections, malignant growth etc., such mechanism may be of utmost pathogenetic significance. Moreover, such a mechanism cannot be also excluded in some physiological immunogenetic interactions, e.g., in feto-maternal system, where it could promote a positive selection for individuals with broader MHC repertoire, which would be necessary for development of individual and population-based resistance to

  7. Evaluation of an on-farm method to assess colostrum IgG content in sows.

    Science.gov (United States)

    Balzani, A; Cordell, H J; Edwards, S A

    2016-04-01

    The objective of this work was to investigate the evaluation of swine colostrum immunoglobulin G (IgG) concentration using the Brix refractometer. Colostrum samples were collected across all teats, from 124 sows of mixed parities. According to sampling time, three categories were created: samples available from 9 h before the onset of parturition until the first piglet was born were classified as before farrowing; samples collected after the first birth until 4 h later were classified as during farrowing; and finally samples collected from this point until 14 h after parturition, were classified as after farrowing. Samples were drawn and divided into three portions; one was immediately analyzed, a second was refrigerated and the third was frozen at -20°C. Fresh and refrigerated colostrum samples were analyzed at the farm with a Brix refractometer. IgG content of frozen samples was analyzed using a Brix refractometer, with a subset of 42 samples also tested with a commercially available radial immune diffusion (RID) kit. The Brix percentage ranged from 18.3% to 33.2%. Brix percentage repeatability, assessed by the intraclass correlation coefficient (ICC), was very strong (fresh ICC=0.98, refrigerated ICC=0.88 and frozen ICC=0.99). One-way repeated-measures ANOVA showed that storage temperature did not affect BRIX percentage of colostrum IgG (P>0.05). ANOVA results show a significant effect of sampling time on colostrum immunoglobulin concentration, measured with both Brix and RID (Brix: Pcolostrum IgG in sows.

  8. IgG+ platelets in the marmoset: their induction, maintenance, and survival

    Energy Technology Data Exchange (ETDEWEB)

    Gengozian, N.; McLaughlin, C.L.

    1980-06-01

    Immunization of marmosets with platelets from another species of marmoset leads to antibody formation to the donor platelets, deposition of IgG on the host's platelets, and thrombocytopenia. This disease closely resembles posttransfusion purpura of man, which may develop after one or two transfusions of whole blood. The mode of immunization in the marmoset was found to be important: intravenous (i.v.) inoculations were without effect, while intramuscular (i.m.) immunizations led to the disease. Intramuscular inoculations were characterized by formation of 7S antibodies, as measured by indirect immunofluorescent (IF) and complement-dependent platelet cytotoxicity (PC) tests; in contrast, i.v. immunizations, while leading to 7S antibodies by the IF test, yielded only 19S antibodies reactive in the PC assay. The titers were also consistently higher with i.m. immunizations. Antibody was not limited to the donor platelets, but auto- or host-type reactivity was also present; this antibody was in very low titer and could be found only when the animal was thrombocytopenic. A primary finding was the ability to maintain increased deposition of IgG on the host's platelets in the absence of thrombocytopenia by biweekly or monthly inoculations of the donor platelet antigen. The amount of IgG found on platelets of normal and immunized marmosets was comparable to that reported for normal humans and patients with cinical immune thrombocytopenia. Finally, platelet survival studies in animals with IgG+ platelets and normal platelet counts indicated a rapid turnover, suggesting operation of a compensatory mechanism to maintain platelet levels.

  9. Toxocara Canis IgG Seropositivity in Patients with Chronic Urticaria.

    Science.gov (United States)

    Burak Selek, Mehmet; Baylan, Orhan; Kutlu, Ali; Özyurt, Mustafa

    2015-08-01

    We aimed to investigate IgG antibody levels specific to Toxocara canis (T. canis), a parasite which subsists in dog's intestine, on serum samples obtained from patients with chronic urticaria (CU) to evaluate effective risk in CU etiopathogenesis. In this study, 73 patients diagnosed with CU and 109 healthy individuals as control group, were included. Various factors such as sex, age, education and income, daily hand washing habits, history of dog owning and soil eating were questioned in patient anamnesis. T. canis IgG antibodies were detected using an enzyme linked immunosorbent assay (ELISA) kit prepared with T. canis larval excretory-secretory antigens. Positive results were confirmed with western blot (WB) WB test. We found T. canis IgG positivity in 17.8% (n=13) of patients (n=73) with CU. But we did not observe any T. canis IgG positivity in healthy controls (n=109). Low molecular weight bands (24-35 kDa) were observed in 11 samples in WB analyses while two of the samples were weakly positive. It is revealed that dog owning history increases T. canis seropositivity 12.9 times while insufficient daily hand washing habit (less than six times a day) increases seropositivity 20.7 times. Our study showed that T. canis may trigger CU since we found 17.8% seropositivity in 73 patients with CU and none in 109 healthy individuals. Moreover, various socio-demographic characteristics have been shown to affect T. canis seropositivity in patients with CU.

  10. Interactions of IgG1 CH2 and CH3 domains with FcRn

    Directory of Open Access Journals (Sweden)

    Tianlei eYing

    2014-04-01

    Full Text Available Antibody fragments are emerging as promising biopharmaceuticals because of their relatively small size and other unique properties. However, when compared to full-size antibodies, most of the current antibody fragments of VH or VL display greatly reduced half-lives. A promising approach to overcome this problem is through the development of novel antibody fragments based on IgG Fc region, which contributes to the long half-life of IgG through its unique pH-dependent association with the neonatal Fc receptor (FcRn. The IgG Fc region comprises two CH2 and two CH3 domains. In this report, we present a comparative study of the FcRn binding capability of the CH2 and CH3 domains. The stability and aggregation resistance of these domains were also investigated and compared. We found that monomeric CH2 and CH3 domains exhibited the pH-dependent FcRn binding while the dimeric forms of CH2 and CH3 domains did not. Although all of these domains had high serum stability, they had aggregation tendencies as measured by dynamic light scattering. By providing a better understanding of the structure-activity relationship of the Fc fragment, these results guide further approaches to generate novel Fc-based small-size antibody fragments that possess pH-dependent FcRn binding capability, desired in vivo half-lives and other favorable biophysical properties for their drugability.

  11. Saliva and sera IgA and IgG in Egyptian Giardia-infected children.

    Science.gov (United States)

    El-Gebaly, Naglaa Saad M; Halawa, Eman Fawzy; Moussa, Hanaa M Ezzat; Rabia, Ibrahim; Abu-Zekry, Maha

    2012-08-01

    Giardiasis is a gastrointestinal infection of wide distribution that is more prevalent in childhood. Easy and rapid diagnosis of giardiasis is essential for reduction of this infection. This cross-sectional study included 62 children in which collection of saliva, stool and serum samples was performed. An enzyme-linked immunosorbent assay (ELISA) technique was evaluated to detect IgA and IgG responses in both saliva and serum samples. Twenty-two children were positive for Giardia duodenalis infection by direct examination of faecal specimens, 20 non-infected and 20 infected with other parasites. Salivary and serum IgA and IgG responses against G. duodenalis infection were significantly higher in Giardia parasitized than non-Giardia parasitized children (p < 0.001). This concludes that specific salivary IgA may serve as a diagnostic tool and specific salivary IgG as a screening tool in monitoring the exposure of various populations to Giardia duodenalis. The advantage of salivary assays over serum immunoglobulin assay is being easy and non-invasive in sampling technique which is important especially for young children.

  12. IgG N-glycans as potential biomarkers for determining galactose tolerance in Classical Galactosaemia.

    LENUS (Irish Health Repository)

    Coss, K P

    2012-02-01

    N-glycan processing and assembly defects have been demonstrated in untreated and partially treated patients with Classical Galactosaemia. These defects may contribute to the ongoing pathophysiology of this disease. The aim of this study was to develop an informative method of studying differential galactose tolerance levels and diet control in individuals with Galactosaemia, compared to the standard biochemical markers. Ten Galactosaemia adults with normal intellectual outcomes were analyzed in the study. Five subjects followed galactose liberalization, increments of 300 mg to 4000 mg\\/day over 16 weeks, and were compared to five adult Galactosaemia controls on a galactose restricted diet. All study subjects underwent clinical and biochemical monitoring of red blood cell galactose-1-phosphate (RBC Gal-1-P) and urinary galactitol levels. Serum N-glycans were isolated and analyzed by normal phase high-performance liquid chromatography (NP-HPLC) with galactosylation of IgG used as a specific biomarker of galactose tolerance. IgG N-glycan profiles showed consistent individual alterations in response to diet liberalization. The individual profiles were improved for all, but one study subject, at a galactose intake of 1000 mg\\/day, with decreases in agalactosylated (G0) and increases in digalactosylated (G2) N-glycans. We conclude that IgG N-glycan profiling is an improved method of monitoring variable galactosylation and determining individual galactose tolerance in Galactosaemia compared to the standard methods.

  13. Use of IgG Avidity test in case definitions of toxoplasmosis in pregnancy.

    Science.gov (United States)

    Zotti, C; Charrier, L; Giacomuzzi, M; Moiraghi Ruggenini, A; Mombrò, M; Fabris, C; Marocchetti, P; Alfieri, R; Leto, R; Renzi, N; Milano, R; Lievre, M A; Colozza, M; Zanella, D; Antona, G; Paschero, M C; Tosetti, F; Miglietti, D; Nicoletta, T; De Renzi, G; Tinivella, F; Donati, M; Ferrini, A; Crotti, G; Coucourde, L; Guazzotti, G C; Gera, A; Malabaila, A; Di Natale, C; Rabozzi, M L; Ginardi, C; Bruzzone, T; Canepa, C; Fruttero, M; Mastracchio, G; Valle, S; Toppino, M; Forno, N; Bellingeri, P; Caraccio, W; Lazzara, C; Decaroli, V; Pedrazzi, E; Gomella, S

    2004-01-01

    A survey network for congenital toxoplasmosis (TOXO-NET) was set up in December 1996 in Piedmont (Italy). Participants were asked to classify the infections in pregnant mothers and newborns by the criteria of the European Network on Congenital Toxoplasmosis published by Lebech in 1996. Because the IgG Avidity test is largely employed as a 2nd level test in toxoplasmosis diagnosis and it could be helpful to date infection, the co-ordinators of TOXO-NET suggested including it in the "case definition" of "probable" infection and "unlikely" infection. 117 cases of toxoplasmosis in pregnancy divided into the risk categories under Lebech's criteria were re-examined using the "new" case definitions. 77 out of 117 (65.8%) Toxoplasma gondii infections during pregnancy could be defined with only one serum sample using the IgG Avidity test. The IgG Avidity test proved a useful method to classify the Toxoplasma gondii infections in pregnancy, especially when we had only one serum sample.

  14. Positive IgG Western Blot for Borrelia burgdorferi in Colombia

    Directory of Open Access Journals (Sweden)

    Palacios Ricardo

    1999-01-01

    Full Text Available In order to evaluate the presence of specific IgG antibodies to Borrelia burgdorferi in patients with clinical manifestations associated with Lyme borreliosis in Cali, Colombia, 20 serum samples from patients with dermatologic signs, one cerebrospinal fluid (CSF sample from a patient with chronic neurologic and arthritic manifestations, and twelve serum samples from individuals without clinical signs associated with Lyme borreliosis were analyzed by IgG Western blot. The results were interpreted following the recommendations of the Centers for Diseases Control and Prevention (CDC for IgG Western blots. Four samples fulfilled the CDC criteria: two serum specimens from patients with morphea (localized scleroderma, the CSF from the patient with neurologic and arthritic manifestations, and one of the controls. Interpretation of positive serology for Lyme disease in non-endemic countries must be cautious. However these results suggest that the putative "Lyme-like" disease may correlate with positivity on Western blots, thus raising the possibility that a spirochete genospecies distinct from B. burgdorferi sensu stricto, or a Borrelia species other than B. burgdorferi sensu lato is the causative agent. Future work will focus on a survey of the local tick and rodent population for evidence of spirochete species that could be incriminated as the etiologic agent.

  15. [Central nervous system in IgG4-related disease: case report and literature review].

    Science.gov (United States)

    Vanegas-Garcia, A L; Calle-Lopez, Y; Zapata, C H; Alvarez-Espinal, D M; Saavedra-Gonzalez, Y A; Arango-Viana, J C

    2016-08-01

    Introduccion. La enfermedad relacionada con IgG4 es una entidad clinica multisistemica recientemente descrita y que se presenta con diferentes manifestaciones clinicas. Los organos que estan afectados con mayor frecuencia son el pancreas, la via biliar y las glandulas salivales, y es menos frecuente la afeccion del sistema nervioso central. Caso clinico. Mujer de 33 años con alteraciones cognitivas, alucinaciones, cefalea, sindrome convulsivo, sinusitis maxilar con afeccion osea y evidencia de paquimeningitis y panhipopituitarismo, con biopsia meningea que confirmo una enfermedad relacionada con IgG4, tras haberse descartado causas secundarias. Se inicio tratamiento con glucocorticoides y azatioprina, sin recaidas despues de 12 meses de seguimiento. Conclusiones. Se debe considerar el diagnostico de enfermedad relacionada con IgG4 en casos de paquimeningitis hipertrofica e hipofisitis, incluso sin que se acompañen de otras manifestaciones sistemicas, siempre que se hayan descartado otras causas mas frecuentes. El tratamiento de eleccion son los glucocorticoides, y puede ser necesario añadir otro inmunosupresor como ahorrador de esteroides y para evitar las recaidas. Se necesitan estudios prospectivos para evaluar las diferentes manifestaciones clinicas y paraclinicas y establecer los resultados del tratamiento a largo plazo.

  16. Atractylodis macrocephalae Koidz. polysaccharides enhance both serum IgG response and gut mucosal immunity.

    Science.gov (United States)

    Xie, Feng; Sakwiwatkul, Kedsirin; Zhang, Cenrong; Wang, Yueming; Zhai, Lijuan; Hu, Songhua

    2013-01-02

    Fifty-six mice were randomly divided into four groups with 14 mice in each. Two groups were subcutaneously injected twice with a foot-and-mouth disease vaccine with 2-week intervals; each of them had been orally administered 0.89% saline or Atractylodis macrocephalae Koidz. polysaccharides (RAMPS) 0.05 g for 4 days before immunization. The rest were not immunized but treated in the same way. One-week after the primary and two weeks after the booster immunization, half in each group were sacrificed to measure serum IgG and the parameters for the intestinal mucosal immunity. Results indicated that oral administration of RAMPS increased both serum specific IgG response and intestinal mucosal immunity as shown by elevated total sIgA, mRNA expression of TGF-β, IL-6, TNF-α, IgA(+) cells and intestinal intraepithelial lymphocytes in duodenum. It is suggested that increased serum IgG response may be associated with enhanced local mucosal immunity by oral administration of RAMPS.

  17. IgG glycan hydrolysis by EndoS inhibits experimental autoimmune encephalomyelitis

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    Benkhoucha Mahdia

    2012-09-01

    Full Text Available Abstract Studies in experimental autoimmune encephalomyelitis (EAE, a mouse model of multiple sclerosis, have shown that B cells markedly influence the course of the disease, although whether their effects are protective or pathological is a matter of debate. EndoS hydrolysis of the IgG glycan has profound effects on IgG effector functions, such as complement activation and Fc receptor binding, suggesting that the enzyme could be used as an immunomodulatory therapeutic agent against IgG-mediated diseases. We demonstrate here that EndoS has a protective effect in myelin oligodendrocyte glycoprotein peptide amino acid 35–55 (MOG35-55-induced EAE, a chronic neuroinflammatory demyelinating disorder of the central nervous system (CNS in which humoral immune responses are thought to play only a minor role. EndoS treatment in chronic MOG35-55-EAE did not impair encephalitogenic T cell priming and recruitment into the CNS of mice, consistent with a primary role of EndoS in controlling IgG effector functions. In contrast, reduced EAE severity coincided with poor serum complement activation and deposition within the spinal cord, suggesting that EndoS treatment impairs B cell effector function. These results identify EndoS as a potential therapeutic agent against antibody-mediated CNS autoimmune disorders.

  18. Specific IgG and its subclass antibodies after immunotherapy with gynandropsis gynandra

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    Latha G

    2005-01-01

    Full Text Available Background : About 10 to 15 % of the Indian population is known to suffer from major allergic disorders such as Asthma, Rhinitis, Atopic Dermatitis and Urticaria. Aeroallergens play a major role in the pathogenesis of respiratory allergic diseases. Among the aeroallergens, pollens are major causative agents. The predominance of pollen allergens necessitate the need to assess the specific immunotherapy (SIT in allergic patients. Objective : To evaluate the effect of immunotherapy based on the presence of IgG and its subclass antibodies towards whole pollen antigen of Gynandropsis gynandra (G.gynandra and its fractions. Material and Methods : A study was conducted in 30 bronchial asthma patients on immunotherapy, by assessing the levels of IgG and its subclasses specific to G. gynandra pollen. Results : There was a significant increase in IgG and its subclass antibodies to whole pollen antigen and its fractions i.e.> 90kD, 46-37kD and 36-32kD after the course of IT. Conclusion : The use of peptide fractions may be more appropriate instead of the whole pollen antigen to test the effect of immunotherapy.

  19. Wuchereria bancrofti filariasis in French Polynesia: age-specific patterns of microfilaremia, circulating antigen, and specific IgG and IgG4 responses according to transmission level.

    Science.gov (United States)

    Chanteau, S; Glaziou, P; Plichart, C; Luquiaud, P; Moulia-Pelat, J P; N'Guyen, L; Cartel, J L

    1995-01-01

    The age-specific patterns of microfilaremia, Og4C3 antigenemia, anti-Brugia malayi IgG and IgG4 were assessed in 3 villages of low, medium and high transmission level for Wuchereria bancrofti filariasis. The prevalence rates for each of the 4 markers were clearly age dependent and their patterns strongly associated with the transmission level. The antigenemia prevalence rate was consistently higher than the microfilaremia prevalence rate, in all age groups. The prevalences of anti-B. malayi IgG and IgG4 responses were very similar and much higher than those of microfilaremia or antigenemia. Antibody responses reached the plateau at an earlier age and at a higher prevalence with increased intensity of transmission. For all the markers, the prevalence rates were significantly higher in males than in females.

  20. Evaluación de la calidad de los reactivos que se utilizan en la tecnica de contrainmunoelectroforesis para la determinación de anticuerpos antirrábicos Evaluation of the quality of the reagents employed in the counterimmunoelectrophoresis technique for the determination of rabies antibodies

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    A. M. Díaz

    1991-02-01

    Full Text Available En este estudio se comprobó que el Instituto Butantan produce antígenos y sueros indicadores que se pueden utilizar con éxito en la prueba de contrainmunoelectroforesis para titular anticuerpos antirrábicos en personas inmunizadas. No se pudieron demostrar diferencias estadísticamente significativas entre los resultados de las pruebas de estandarización realizadas en el Instituto Butantan y las pruebas de control de referencia llevadas a cabo en el Centro Panamericano de Zoonosis. Se propone que el Instituto Butantan produzca y distribuya a nivel nacional los reactivos para que los laboratorios de diagnóstico apliquen la técnica de contrainmunoelectroforesis para la determinación de anticuerpos antirrábicos.This study demonstrated that the antigens and indicator sera produced by the Butantan Institute may be employed with success in the counterimmunoelectrophoresis technique for the titration of rabies antibodies in sera from immunized individuals. No statistically significant differences were demonstrated between the results obtained in the standardization tests carried out at the Butantan Institute and the reference control tests performed at the Pan American Zoonoses Center. It is proposed that the Butantan Institute be in charge of the production and distribution of these reagents at the national level.

  1. Generation of bispecific IgG antibodies by structure-based design of an orthogonal Fab interface.

    Science.gov (United States)

    Lewis, Steven M; Wu, Xiufeng; Pustilnik, Anna; Sereno, Arlene; Huang, Flora; Rick, Heather L; Guntas, Gurkan; Leaver-Fay, Andrew; Smith, Eric M; Ho, Carolyn; Hansen-Estruch, Christophe; Chamberlain, Aaron K; Truhlar, Stephanie M; Conner, Elaine M; Atwell, Shane; Kuhlman, Brian; Demarest, Stephen J

    2014-02-01

    Robust generation of IgG bispecific antibodies has been a long-standing challenge. Existing methods require extensive engineering of each individual antibody, discovery of common light chains, or complex and laborious biochemical processing. Here we combine computational and rational design approaches with experimental structural validation to generate antibody heavy and light chains with orthogonal Fab interfaces. Parental monoclonal antibodies incorporating these interfaces, when simultaneously co-expressed, assemble into bispecific IgG with improved heavy chain-light chain pairing. Bispecific IgGs generated with this approach exhibit pharmacokinetic and other desirable properties of native IgG, but bind target antigens monovalently. As such, these bispecific reagents may be useful in many biotechnological applications.

  2. A Label-Free Immunosensor for IgG Based on an Extended-Gate Type Organic Field Effect Transistor

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    Tsukuru Minamiki

    2014-09-01

    Full Text Available A novel biosensor for immunoglobulin G (IgG detection based on an extended-gate type organic field effect transistor (OFET has been developed that possesses an anti-IgG antibody on its extended-gate electrode and can be operated below 3 V. The titration results from the target IgG in the presence of a bovine serum albumin interferent, clearly exhibiting a negative shift in the OFET transfer curve with increasing IgG concentration. This is presumed to be due an interaction between target IgG and the immobilized anti-IgG antibody on the extended-gate electrode. As a result, a linear range from 0 to 10 µg/mL was achieved with a relatively low detection limit of 0.62 µg/mL (=4 nM. We believe that these results open up opportunities for applying extended-gate-type OFETs to immunosensing.

  3. Glycoprofiling effects of media additives on IgG produced by CHO cells in fed-batch bioreactors

    DEFF Research Database (Denmark)

    Kildegaard, Helene Faustrup; Fan, Yuzhou; Wagtberg Sen, Jette

    2016-01-01

    . In this study, the effect on IgG N-glycosylation from feeding CHO cells with eight glycosylation precursors during cultivation was investigated. The study was conducted in fed-batch mode in bioreactors with biological replicates to obtain highly controlled and comparable conditions. We assessed charge......Therapeutic monoclonal antibodies (mAbs) are mainly produced by heterogonous expression in Chinese hamster ovary (CHO) cells. The glycosylation profile of the mAbs has major impact on the efficacy and safety of the drug and is therefore an important parameter to control during production...... heterogeneity and glycosylation patterns of IgG. None of the eight feed additives caused statistically significant changes to cell growth or IgG productivity, compared to controls. However, the addition of 20 mM galactose did result in a reproducible increase of galactosylated IgG from 14% to 25%. On the other...

  4. Prevalencia de anticuerpos contra Trypanosoma cruzi en donadores de sangre del IMSS, Orizaba, Veracruz, México Prevalence of antibodies against Trypanossoma cruzi in blood bank donors from the IMSS General Hospital in Onizaba, Veracruz, Mexico

    Directory of Open Access Journals (Sweden)

    Angel Ramos-Ligonio

    2006-02-01

    Full Text Available OBJETIVO: Determinar la prevalencia de anticuerpos contra Trypanosoma cruzi en donadores del Hospital General Regional del Instituto Mexicano del Seguro Social (IMSS en la ciudad de Orizaba, Veracruz. MATERIAL Y MÉTODOS: Se examinaron muestras de donadores del banco de sangre del Hospital General Regional (HGRO del IMSS para la búsqueda de antiT. cruzi por ELISA, Western blot e IFI, utilizando una proteína recombinante (MBP::Hsp70 y un extracto crudo de epimastigotes. Las muestras fueron obtenidas entre los meses de octubre de 2001 a enero de 2002. RESULTADOS: Los 420 donadores de sangre analizados fueron seronegativos para HBV, HCV, BrA, VDRL y HIV. Después del tamizaje de los 420 donadores, se identificaron dos individuos seropositivos por las pruebas de ELISA, Western blot e IFI, con una seroprevalencia de 0.48%. CONCLUSIONES: En este estudio se muestran evidencias de seropositividad para T. cruzi en donadores de sangre del HGRO, lo que sugiere la existencia de riesgo de contaminación por transfusión sanguínea. Por tal motivo, es necesario aplicar programas para el tamizaje serológico a través de técnicas inmunológicas con alta sensibilidad y especificidad.OBJECTIVE: To estimate the prevalence of antibodies against Trypanosoma cruzi in blood donors from Hospital General Regional (HGRO of the Mexican Institute of Social Security (IMSS per its abbreviation in Spanish. MATERIAL AND METHODS: Between October 2001 and January 2002, blood samples were collected from voluntary donors at the blood bank of the Hospital General Regional of IMSS in Orizaba; Veracruz, Mexico. The samples were assayed for anti-T. cruzi by ELISA, Western blot and IFI, using a recombinant protein (MBP::Hsp70, and crude extract from epimastigotes. RESULTS: A total of 420 blood donors were studied; two of them were seropositive for ELISA, Western blot and IFI, with a seroprevalence of 0.48%. CONCLUSIONS: Some blood donors at the HGRO hospital were seropositive for T

  5. Milk protein IgG and IgA: The association with milk-induced gastrointestinal symptoms in adults

    Institute of Scientific and Technical Information of China (English)

    Sari Anthoni; Erkki Savilahti; Hilpi Rautelin; Kaija-Leena Kolho

    2009-01-01

    AIM: To study the association between serum levels of milk protein IgG and IgA antibodies and milk-related gastrointestinal symptoms in adults.METHODS: Milk protein IgG and IgA antibodies were determined in serum samples of 400 subjects from five outpatient clinics in Southern Finland. Subjects were randomly selected from a total of 1900 adultsundergoing laboratory investigations in primary care. All 400 participants had completed a questionnaire onabdominal symptoms and dairy consumption while waiting for the laboratory visit. The questionnairecovered the nature and frequency of gastrointestinal problems, the provoking food items, family history and allergies. Twelve serum samples were disqualified due to insufficient amount of sera. The levels of specific milkprotein IgG and IgA were measured by using the ELISA technique. The association of the milk protein-specific antibody level was studied in relation to the milk-related gastrointestinal symptoms and dairy consumption.RESULTS: Subjects drinking milk ( n = 265) had higher levels of milk protein IgG in their sera than non-milk drinkers ( n = 123, P < 0.001). Subjects with gastrointestinal problems related to milk drinking ( n = 119) consumed less milk but had higher milk protein IgG levels than those with no milk-related gastrointestinal symptoms ( n = 198, P = 0.02). Among the symptomatic subjects, those reporting dyspeptic symptoms had lower milk protein IgG levels than non-dyspeptics ( P < 0.05). However, dyspepsia was not associated with milk drinking ( P = 0.5). The association of high milk protein IgG levels with constipation was close to the level of statistical significance. Diarrhea had no association with milk protein IgG level ( P = 0.5). With regard to minor symptoms, flatulence and bloating ( P = 0.8), were not associated with milk protein IgG level. Milk protein IgA levels did not show any association with milk drinking or abdominal symptoms. The levels of milk protein IgA and IgG declined as the

  6. Antigen-Specific IgG ameliorates allergic airway inflammation via Fcγ receptor IIB on dendritic cells

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    Karasuyama Hajime

    2011-04-01

    Full Text Available Abstract Background There have been few reports on the role of Fc receptors (FcRs and immunoglobulin G (IgG in asthma. The purpose of this study is to clarify the role of inhibitory FcRs and antigen presenting cells (APCs in pathogenesis of asthma and to evaluate antigen-transporting and presenting capacity by APCs in the tracheobronchial mucosa. Methods In FcγRIIB deficient (KO and C57BL/6 (WT mice, the effects of intratracheal instillation of antigen-specific IgG were analysed using the model with sensitization and airborne challenge with ovalbumin (OVA. Thoracic lymph nodes instilled with fluorescein-conjugated OVA were analysed by fluorescence microscopy. Moreover, we analysed the CD11c+ MHC class II+ cells which intaken fluorescein-conjugated OVA in thoracic lymph nodes by flow cytometry. Also, lung-derived CD11c+ APCs were analysed by flow cytometry. Effects of anti-OVA IgG1 on bone marrow dendritic cells (BMDCs in vitro were also analysed. Moreover, in FcγRIIB KO mice intravenously transplanted dendritic cells (DCs differentiated from BMDCs of WT mice, the effects of intratracheal instillation of anti-OVA IgG were evaluated by bronchoalveolar lavage (BAL. Results In WT mice, total cells and eosinophils in BAL fluid reduced after instillation with anti-OVA IgG1. Anti-OVA IgG1 suppressed airway inflammation in hyperresponsiveness and histology. In addition, the number of the fluorescein-conjugated OVA in CD11c+ MHC class II+ cells of thoracic lymph nodes with anti-OVA IgG1 instillation decreased compared with PBS. Also, MHC class II expression on lung-derived CD11c+ APCs with anti-OVA IgG1 instillation reduced. Moreover, in vitro, we showed that BMDCs with anti-OVA IgG1 significantly decreased the T cell proliferation. Finally, we demonstrated that the lacking effects of anti-OVA IgG1 on airway inflammation on FcγRIIB KO mice were restored with WT-derived BMDCs transplanted intravenously. Conclusion Antigen-specific IgG ameliorates

  7. Low positive predictive value of anti-Brugia malayi IgG and IgG4 serology for the diagnosis of Wuchereria bancrofti.

    Science.gov (United States)

    Chanteau, S; Glaziou, P; Moulia-Pelat, J P; Plichart, C; Luquiaud, P; Cartel, J L

    1994-01-01

    Enzyme-linked immunosorbent assays (ELISAs) for anti-Brugia malayi immunoglobulin (Ig) G and IgG4 were evaluated on sera from 1561 subjects in French Polynesia for the serodiagnosis of Wuchereria bancrofti filariasis, compared with the test for Onchocerca gibsoni circulating antigen (Og4C3) as a 'gold standard'. The sensitivity of the ELISA-IgG and ELISA-IgG4 assays was 90.8% and 94.5%, and the specificity was 45.9% and 50.7%. The positive predictive values were 41% and 45% respectively for an antigen prevalence rate of 30%. Thus antibody prevalences exceeded by two-fold the antigen prevalence, which itself exceeded by two-fold the prevalence of microfilaraemia.

  8. Agglutinating mouse IgG3 compares favourably with IgMs in typing of the blood group B antigen: Functionality and stability studies.

    Science.gov (United States)

    Klaus, Tomasz; Bzowska, Monika; Kulesza, Małgorzata; Kabat, Agnieszka Martyna; Jemioła-Rzemińska, Małgorzata; Czaplicki, Dominik; Makuch, Krzysztof; Jucha, Jarosław; Karabasz, Alicja; Bereta, Joanna

    2016-08-03

    Mouse immunoglobulins M (IgMs) that recognize human blood group antigens induce haemagglutination and are used worldwide for diagnostic blood typing. Contrary to the current belief that IgGs are too small to simultaneously bind antigens on two different erythrocytes, we obtained agglutinating mouse IgG3 that recognized antigen B of the human ABO blood group system. Mouse IgG3 is an intriguing isotype that has the ability to form Fc-dependent oligomers. However, F(ab')2 fragments of the IgG3 were sufficient to agglutinate type B red blood cells; therefore, IgG3-triggered agglutination did not require oligomerization. Molecular modelling indicated that mouse IgG3 has a larger range of Fab arms than other mouse IgG subclasses and that the unique properties of mouse IgG3 are likely due to the structure of its hinge region. With a focus on applications in diagnostics, we compared the stability of IgG3 and two IgMs in formulated blood typing reagents using an accelerated storage approach and differential scanning calorimetry. IgG3 was much more stable than IgMs. Interestingly, the rapid decrease in IgM activity was caused by aggregation of the molecules and a previously unknown posttranslational proteolytic processing of the μ heavy chain. Our data point to mouse IgG3 as a potent diagnostic tool.

  9. Agglutinating mouse IgG3 compares favourably with IgMs in typing of the blood group B antigen: Functionality and stability studies

    Science.gov (United States)

    Klaus, Tomasz; Bzowska, Monika; Kulesza, Małgorzata; Kabat, Agnieszka Martyna; Jemioła-Rzemińska, Małgorzata; Czaplicki, Dominik; Makuch, Krzysztof; Jucha, Jarosław; Karabasz, Alicja; Bereta, Joanna

    2016-01-01

    Mouse immunoglobulins M (IgMs) that recognize human blood group antigens induce haemagglutination and are used worldwide for diagnostic blood typing. Contrary to the current belief that IgGs are too small to simultaneously bind antigens on two different erythrocytes, we obtained agglutinating mouse IgG3 that recognized antigen B of the human ABO blood group system. Mouse IgG3 is an intriguing isotype that has the ability to form Fc-dependent oligomers. However, F(ab′)2 fragments of the IgG3 were sufficient to agglutinate type B red blood cells; therefore, IgG3-triggered agglutination did not require oligomerization. Molecular modelling indicated that mouse IgG3 has a larger range of Fab arms than other mouse IgG subclasses and that the unique properties of mouse IgG3 are likely due to the structure of its hinge region. With a focus on applications in diagnostics, we compared the stability of IgG3 and two IgMs in formulated blood typing reagents using an accelerated storage approach and differential scanning calorimetry. IgG3 was much more stable than IgMs. Interestingly, the rapid decrease in IgM activity was caused by aggregation of the molecules and a previously unknown posttranslational proteolytic processing of the μ heavy chain. Our data point to mouse IgG3 as a potent diagnostic tool. PMID:27484487

  10. Decreased levels of bisecting GlcNAc glycoforms of IgG are associated with human longevity.

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    L Renee Ruhaak

    Full Text Available BACKGROUND: Markers for longevity that reflect the health condition and predict healthy aging are extremely scarce. Such markers are, however, valuable in aging research. It has been shown previously that the N-glycosylation pattern of human immunoglobulin G (IgG is age-dependent. Here we investigate whether N-linked glycans reflect early features of human longevity. METHODOLOGY/PRINCIPAL FINDINGS: The Leiden Longevity Study (LLS consists of nonagenarian sibling pairs, their offspring, and partners of the offspring serving as control. IgG subclass specific glycosylation patterns were obtained from 1967 participants in the LLS by MALDI-TOF-MS analysis of tryptic IgG Fc glycopeptides. Several regression strategies were applied to evaluate the association of IgG glycosylation with age, sex, and longevity. The degree of galactosylation of IgG decreased with increasing age. For the galactosylated glycoforms the incidence of bisecting GlcNAc increased as a function of age. Sex-related differences were observed at ages below 60 years. Compared to males, younger females had higher galactosylation, which decreased stronger with increasing age, resulting in similar galactosylation for both sexes from 60 onwards. In younger participants (60 years, decreased levels of non-galactosylated glycoforms containing a bisecting GlcNAc reflected early features of longevity. CONCLUSIONS/SIGNIFICANCE: We here describe IgG glycoforms associated with calendar age at all ages and the propensity for longevity before middle age. As modulation of IgG effector functions has been described for various IgG glycosylation features, a modulatory effect may be expected for the longevity marker described in this study.

  11. Titer IgG Pertusis pada Usia Remaja, Dewasa, dan Orang Tua Mempergunakan Metode ELISA dan Mikroaglutinasi Pertusis

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    Novilia Sjafri Bachtiar

    2011-03-01

    Full Text Available Pertussis antigen which only given in primary immunization, could not protect for a long period. In some countries whooping cough became an reemerging disease. The objective of this study was to evaluate the correlation between age and percentage of positive IgG pertussis in adolescent, adult, and elderly population using enzyme link immunosorbent assay (ELISA and microagglutination. This observational analytic with cross sectional study was done on 402 subjects, consisted of 134 adolescents (12–18 years, 187 adults (19–49 years, and 81 elderly (50–64 years in Bandung, period 2008–2010. Titer of pertussis IgG was measured using ELISA and microagglutination of pertussis (MAP. The ELISA results showed positive IgG pertussis in 92 (68.7% adolescent, 143 (76.5% adults, and 72 (88.9% elderly (p=0.003. The results of MAP showed positive pertussis IgG in adolescent, adults, and elderly were 27 (20.1%, 9 (4.8%, and 3 (3.37%, respectively, which was decreased with age (p<0.001. If MAP positive samples were excluded from the analysis in ELISA positive samples, which express the IgG pertussis due to contact with circulate B, the pertussis IgG positive was 68.9%. In conclusion, there is a correlation between age and percentage of positive IgG pertussis titer in adolescent, adult, and ederly population in Bandung using ELISA and MAP methods. Positive pertussis IgG by ELISA is increased with age.

  12. The human IgG anti-carbohydrate repertoire exhibits a universal architecture and contains specificity for microbial attachment sites

    OpenAIRE

    Schneider, Christoph; Smith, David F; Cummings, Richard D.; Boligan, Kayluz Frias; Hamilton, Robert G.; Bochner, Bruce S; Miescher, Sylvia; Simon, Hans-Uwe; Pashov, Anastas; Vassilev, Tchavdar; von Gunten, Stephan

    2015-01-01

    Despite the paradigm that carbohydrates are T cell-independent antigens, isotype-switched glycan-specific IgG antibodies and polysaccharide-specific T cells are found in humans. We employed a systems level approach combined with glycan array technology to decipher the repertoire of carbohydrate-specific IgG antibodies in intravenous and subcutaneous immunoglobulin (IVIG/SCIG) preparations. A strikingly universal architecture of this repertoire with modular organization among different donor p...

  13. A case of non-lacrimal immunoglobulin G4 (IgG4)-related orbital disease with mastitis.

    Science.gov (United States)

    Farooq, Tahir Ali; Mudhar, Hardeep; Sandramouli, S

    2016-01-01

    IgG4-related orbital disease is a recognised cause for orbital inflammation. As its awareness increases and diagnostic accuracy improves there will be an increased number of cases being identified. This unique case demonstrates for the first time, with histological evidence, a case of a non-lacrimal IgG4-related orbital disease with concurrent IgG4-related mastitis. We describe a 47 year old who presented with a supraorbital swelling and mass. This was initially successfully treated with oral steroids and was later excised on recurrence. Immunohistochemical and blood serum analysis confirmed IgG4-related orbital disease. On systemic enquiry she was found to have a mass of the breast, which was shown to be IgG4-related mastitis. She is currently asymptomatic with no sign of recurrence and is under long-term surveillance. This case highlights the importance of systemic work up in patients presenting with orbital foci of IgG4 disease.

  14. Detection of Bovine IgG Isotypes in a PPA-ELISA for Johne's Disease Diagnosis in Infected Herds

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    Bárbara Fernández

    2012-01-01

    Full Text Available Johne's Disease or Paratuberculosis is a chronic granulomatous enteritis disease affecting ruminants. Detection of subclinically infected animals is difficult, hampering the control of this disease. The aim of this work was to evaluate the performance of detection of IgG isotypes in a PPA-ELISA to improve the recognition of cattle naturally infected with Map in different stages. A total of 108 animals from Tuberculosis-free herds were grouped as follows: exposed (n=30, subclinically infected (n=26, clinically infected (n=14, and healthy controls (n=38. Receiver-operating characteristic (ROC curves of isotypes/PPA-ELISAs were constructed and areas under the curves were compared to evaluate the performance of each test. Our study demonstrated that the conventional PPA-ELISA (detecting IgG is the best to identify clinically infected animals with high sensitivity (92.9% and specificity (100%. Meanwhile, IgG2/PPA-ELISA improved the number of subclinically infected cattle detected as compared with conventional IgG/PPA-ELISA (53.8 versus 23.1%. In addition, it had the maximum sensitivity (65.0%, taking into account all Map-infected cattle. In conclusion, the combination of IgG and IgG2/PPA-ELISAs may improve the identification of Map-infected cattle in different stages of disease. The usefulness of IgG2 detection in serological tests for Johne's Disease diagnosis should be further evaluated.

  15. Time-dependent solubilization of IgG in AOT-brine-isooctane microemulsions: role of cluster formation.

    Science.gov (United States)

    Gerhardt, N I; Dungan, S R

    2002-04-05

    The stability and structure of protein-containing water-in-oil (w/o) microemulsions were investigated by using the large protein immunoglobulin G (IgG, MW 155,000) in a mixture comprised of brine, sulfosuccinic acid bis [2-ethylhexyl]ester (sodium salt), and isooctane. We explored factors affecting the initial uptake of IgG into the w/o microemulsion and its subsequent release to a solid (precipitate) phase, and the kinetics of the latter process. Influences of such parameters as pH, ionic strength, and protein concentration on the solubilization and precipitation of bovine IgG in the organic phase are described. The structure and dynamics in microemulsions containing bovine IgG were probed by using dynamic light scattering, and it was found that the presence of IgG in the microemulsion induced strong attractive forces between the droplets. Based on results obtained by using these various experimental approaches, a model for protein solubilization and release is proposed. In this model, we propose the formation of clusters within which bovine IgG resides and which substantially slow the kinetics of protein release from the droplets to the precipitate phase.

  16. Nano-visualization of oriented-immobilized IgGs on immunosensors by high-speed atomic force microscopy

    Science.gov (United States)

    Iijima, Masumi; Somiya, Masaharu; Yoshimoto, Nobuo; Niimi, Tomoaki; Kuroda, Shun'ichi

    2012-11-01

    Oriented immobilization of sensing molecules on solid phases is an important issue in biosensing. In case of immunosensors, it is essential to scrutinize not only the direction and shape of immunoglobulin G (IgG) in solution but also the real-time movement of IgGs, which cannot be achieved by conventional techniques. Recently, we developed bio-nanocapsules (BNCs) displaying a tandem form of the IgG Fc-binding Z domain derived from Staphylococcus aureus protein A (ZZ-BNC) to enhance the sensitivity and antigen-binding capacity of IgG via oriented-immobilization. Here, we used high-speed atomic force microscopy (HS-AFM) to reveal the fine surface structure of ZZ-BNC and observe the movement of mouse IgG3 molecules tethered onto ZZ-BNC in solution. ZZ-BNC was shown to act as a scaffold for oriented immobilization of IgG, enabling its Fv regions to undergo rotational Brownian motion. Thus, HS-AFM could decipher real-time movement of sensing molecules on biosensors at the single molecule level.

  17. Recurrent membranous nephropathy in an allograft caused by IgG3κ targeting the PLA2 receptor.

    Science.gov (United States)

    Debiec, Hanna; Hanoy, Melanie; Francois, Arnaud; Guerrot, Dominique; Ferlicot, Sophie; Johanet, Catherine; Aucouturier, Pierre; Godin, Michel; Ronco, Pierre

    2012-12-01

    Up to 80% of patients with idiopathic membranous nephropathy have non-complement-fixing IgG4 autoantibodies to the phospholipase A2 receptor (PLA2R). Membranous nephropathy recurs in approximately 40% of patients after kidney transplantation, but the mechanism is unknown. Here, we describe a patient with recurrent membranous nephropathy 13 days after kidney transplantation whose graft biopsy specimen showed granular staining for C3, C5b-9, C1q, and IgG3κ; electron microscopy revealed subepithelial nonorganized deposits. A search for hematologic disorders was negative. Retrospective evaluation of a biopsy sample from the native kidney revealed a similar pattern: monotypic IgG3κ deposits together with C3, C1q, and C5b-9. Glomerular deposits contained PLA2R in both the graft and the native kidney, suggesting that the recurrence was the result of circulating anti-PLA2R antibodies binding to PLA2R antigen expressed on donor podocytes. Confocal analysis of anti-PLA2R and antihuman IgG3 showed co-localization, and the patient had IgG3κ-restricted circulating anti-PLA2R antibodies. Treatment with rituximab stabilized both proteinuria and serum creatinine, and circulating anti-PLA2R became undetectable. In summary, this case of recurrent membranous nephropathy in a graft suggests that circulating monoclonal anti-PLA2R IgG3κ caused the disease and activated complement by the classic pathway.

  18. Serum or breast milk immunoglobulins mask the self-reactivity of human natural IgG antibodies.

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    Djoumerska-Alexieva, Iglika; Manoylov, Iliyan; Dimitrov, Jordan D; Tchorbanov, Andrey

    2014-04-01

    B cells producing IgG antibodies specific to a variety of self- or foreign antigens are a normal constituent of the immune system of all healthy individuals. These naturally occurring IgG antibodies are found in the serum, external secretions, and pooled human immunoglobulin preparations. They bind with low affinity to antigens, which can also be targets for pathologic autoantibodies. An enhancement of naturally occurring IgG autoantibody activity was observed after treatment of human IgG molecules with protein-destabilizing agents. We have investigated the interactions of human immunoglobulins that were obtained from serum or from breast milk of healthy individuals or IVIg with human liver antigens. Proteins from an individual serum or milk were isolated by two methods, one of which included exposure to low pH and the other did not. Purified serum, mucosal IgM, IgA, and the fraction containing immunoglobulin G F(ab')2 fragments each inhibited the binding of a single donor or pooled IgG to human liver antigens. Our study presents findings regarding the role of the breast milk or serum antibodies in blocking the self-reactivity of IgG antibodies. It supports the suggestion that not IVIg only, but also the pooled human IgM and IgA might possess a potent beneficial immunomodulatory activity in autoimmune patients.

  19. Prevalencia de anticuerpos anti-Chlamydia trachomatis y anti-Neisseria gonorrhoeae en grupos de individuos de la población mexicana Prevalence of antibodies against Chlamydia trachomatis and Neisseria gonorrhoeae in Mexican populations

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    María del Carmen Cravioto

    2003-01-01

    Full Text Available OBJETIVO: Estimar la prevalencia de infección por Chlamydia trachomatis (CT y Neisseria gonorrhoeae (NG en grupos de individuos con diferente riesgo para infecciones de transmisión sexual. MATERIAL Y MÉTODOS: Estudio transversal multicéntrico efectuado en el Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, de la Ciudad de México, de enero de 1992 a diciembre de 1993, en el que se estudiaron 945 individuos en edad reproductiva, 585 mujeres y 360 hombres. Según su riesgo para infecciones de transmisión sexual se clasificaron en grupos de alto y bajo riesgo. Los de alto riesgo incluyeron mujeres infértiles con daño tubario, mujeres con embarazo ectópico o aborto, hombres infértiles, pacientes con VIH/SIDA, hombres homo o bisexuales y trabajadoras del sexo comercial (TSC. Los de bajo riesgo: mujeres primigestas, hombres fértiles y mujeres infértiles sin daño tubario. Se determinó en duplicado IgG e IgA anti-NG y anti-CT en suero, por análisis inmunoenzimático, utilizando como antígeno el pili de NG y la fracción L1 de CT. Se calcularon porcentajes. RESULTADOS: En mujeres la prevalencia para NG fue IgG 13.7% e IgA 14.3%, y para CT fue IgG 11.4% e IgA 4.4%. En hombres, NG 3.3% y 13.3%, respectivamente, y para CT 7.2% y 5.5%, respectivamente. En TSC se encontró NG en 31.2 % y 28.4%, respectivamente, y para CT 25.0% y 5.7%, respectivamente. En mujeres con infertilidad por daño tubario, NG 5.6% y 9.8%, respectivamente, y CT 8.4% y 1.4%, respectivamente. En 110 primigestas jóvenes, NG 4.5% y 10.0%, respectivamente, y CT 3.6% y 9.1%, respectivamente. CONCLUSIONES: Estos datos confirman la prevalencia elevada de Neisseria gonorrhoeae y Chlamydia trachomatis en trabajadoras del sexo comercial y en hombres homo/bisexuales, pero no en otros grupos de alto riesgo como las mujeres infértiles, con aborto o embarazo ectópico.OBJECTIVE: To estimate the prevalence of Chlamydia trachomatis (CT and Neisseria gonorrhoeae

  20. Binding of fusion protein FLSC IgG1 to CCR5 is enhanced by CCR5 antagonist Maraviroc.

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    Latinovic, Olga; Schneider, Kate; Szmacinski, Henryk; Lakowicz, Joseph R; Heredia, Alonso; Redfield, Robert R

    2014-12-01

    The CCR5 chemokine receptor is crucial for human immunodeficiency virus type 1 (HIV-1) infection, acting as the principal coreceptor for HIV-1 entry and transmission and is thus an attractive target for antiviral therapy. Studies have suggested that CCR5 surface density and its conformational changes subsequent to virion engagement are rate limiting for entry, and consequently, infection. Not all CCR5 antibodies inhibit HIV-1 infection, suggesting a need for more potent reagents. Here we evaluated full length single chain (FLSC) IgG1, a novel IgG-CD4-gp120(BAL) fusion protein with several characteristics that make it an attractive candidate for treatment of HIV-1 infections, including bivalency and a potentially increased serum half-life over FLSC, the parental molecule. FLSC IgG1 binds two domains on CCR5, the N-terminus and the second extracellular loop, lowering the levels of available CCR5 viral attachment sites. Furthermore, FLSC IgG1 synergizes with Maraviroc (MVC), the only licensed CCR5 antagonist. In this study, we used both microscopy and functional assays to address the mechanistic aspects of the interactions of FLSC IgG1 and MVC in the context of CCR5 conformational changes and viral infection. We used a novel stochastic optical reconstruction microscopy (STORM), based on high resolution localization of photoswitchable dyes to visualize direct contacts between FLSC IgG1 and CCR5. We compared viral entry inhibition by FLSC IgG1 with that of other CCR5 blockers and showed FLSC IgG1 to be the most potent. We also showed that lower CCR5 surface densities in HIV-1 infected primary cells result in lower FLSC IgG1 EC50 values. In addition, CCR5 binding by FLSC IgG1, but not CCR5 Ab 2D7, was significantly increased when cells were treated with MVC, suggesting MVC allosterically increases exposure of the FLSC IgG1 binding site. These data have implications for future antiviral therapy development.

  1. Altered glycosylation of complexed native IgG molecules is associated with disease activity of systemic lupus erythematosus.

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    Sjöwall, C; Zapf, J; von Löhneysen, S; Magorivska, I; Biermann, M; Janko, C; Winkler, S; Bilyy, R; Schett, G; Herrmann, M; Muñoz, L E

    2015-05-01

    In addition to the redundancy of the receptors for the Fc portion of immunoglobulins, glycans result in potential ligands for a plethora of lectin receptors found in immune effector cells. Here we analysed the exposure of glycans containing fucosyl residues and the fucosylated tri-mannose N-type core by complexed native IgG in longitudinal serum samples of well-characterized patients with systemic lupus erythematosus. Consecutive serum samples of a cohort of 15 patients with systemic lupus erythematosus during periods of increased disease activity and remission were analysed. All patients fulfilled the 1982 American College of Rheumatology classification criteria. Sera of 15 sex- and age-matched normal healthy blood donors served as controls. The levels and type of glycosylation of complexed random IgG was measured with lectin enzyme-immunosorbent assays. After specifically gathering IgG complexes from sera, biotinylated lectins Aleuria aurantia lectin and Lens culinaris agglutinin were employed to detect IgG-associated fucosyl residues and the fucosylated tri-mannose N-glycan core, respectively. In sandwich-ELISAs, IgG-associated IgM, IgA, C1q, C3c and C-reactive protein (CRP) were detected as candidates for IgG immune complex constituents. We studied associations of the glycan of complexed IgG and disease activity according to the physician's global assessment of disease activity and the systemic lupus erythematosus disease activity index 2000 documented at the moment of blood taking. Our results showed significantly higher levels of Aleuria aurantia lectin and Lens culinaris agglutinin binding sites exposed on IgG complexes of patients with systemic lupus erythematosus than on those of normal healthy blood donors. Disease activity in systemic lupus erythematosus correlated with higher exposure of Aleuria aurantia lectin-reactive fucosyl residues by immobilized IgG complexes. Top levels of Aleuria aurantia lectin-reactivity were found in samples taken during the

  2. PURIFIED IGG F C-BINDING PROTEINS FROM M22 GROUP A STREPTOCOCCUS ARE ABLE TO INDUCE EXPERIMENTAL GLOMERULONEPHRITIS

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    L. A. Burova

    2012-01-01

    Full Text Available Abstract. Pathogenesis of acute post-streptococcal glomerulonephritis (APSGN, a major complication of group A streptococcal (GAS throat or skin disease, remains unclear. Over years, various theories were based on distinct streptococcal extracellular factors, as well as immunological mimicry of streptococci for renal tissue antigens was considered. Previously we reported that a lot of clinical GAS isolates with proven nephritogenic ability show a non-immune binding of monomeric or aggregated IgG. Moreover, using a rabbit model of APSGN, we obtained evidence for important causative role of streptococcal IgG Fc-binding proteins (IgG FcBPs belonging to the M family surface proteins. I.e., rabbits injected by whole IgG FcBP-positive streptococci showed induction of renal glomerular changes, with deposition of IgG and complement C3, resembling the picture recorded in human APSGN. These typical renal changes were always preceded by development of circulating anti-IgG antibodies. Present study was performed in the same rabbit model. Both purified IgG FcBPs isolated from type M22 GAS were found to elicit glomerular degenerative damage of renal glomeruli comparable to those caused by whole bacteria, as well as induce anti-IgG antibodies, deposition of IgG and C3 complement and production of proinflammatory cytokines (IL-1β, TNFα, IL-6 by glomerular mesangial and endothelial cells. By contrast, rabbits injected with proteins A or G, IgG FcBPs of S. aureus and group G streptococci, respectively, exhibited only low levels of circulating anti-IgG and reversible glomerular changes. In these settings, we have not observed any features of membranousproliferative glomerulonephritis (GN resembling morphological traits of acute post-streptococcal GN in humans. These data correlated with results obtained after injection of intact Staphylococcus aureus (Cowan 1 strain or group G streptococci (G148 strain. Both microbial types are known to harbor IgG Fc

  3. Galactosylation of IgG1 modulates FcγRIIB-mediated inhibition of murine autoimmune hemolytic anemia.

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    Yamada, Kazunori; Ito, Kiyoaki; Furukawa, Jun-Ichi; Nakata, Junichiro; Alvarez, Montserrat; Verbeek, J Sjef; Shinohara, Yasuro; Izui, Shozo

    2013-12-01

    Murine immune effector cells express three different stimulatory FcγRs (FcγRI, FcγRIII and FcγRIV) and one inhibitory receptor, FcγRIIB. Competitive engagement of stimulatory and inhibitory FcγRs has been shown to be critical for the development of immune complex-mediated inflammatory disorders. Because of the previous demonstration that FcγRIIB was unable to inhibit FcγRIII-mediated autoimmune hemolytic anemia induced by 105-2H IgG1 anti-RBC mAb, we reevaluated the regulatory role of FcγRIIB on the development of anemia using two additional IgG1 anti-RBC mAbs (34-3C and 3H5G1) and different 34-3C IgG subclass-switch variants. We were able to induce a more severe anemia in FcγRIIB-deficient mice than in FcγRIIB-sufficient mice after injection of 34-3C and 3H5G1 IgG1, but not 105-2H IgG1. Structural analysis of N-linked oligosaccharides attached to the CH2 domain revealed that 105-2H was poorly galactosylated as compared with the other mAbs, while the extent of sialylation was comparable between all mAbs. In addition, we observed that a more galactosylated 105-2H variant provoked more severe anemia in FcγRIIB-deficient mice than FcγRIIB-sufficient mice. In contrast, the development of anemia induced by three non-IgG1 subclass variants of the 34-3C mAb was not down-regulated by FcγRIIB, although they were more galactosylated than its IgG1 variant. These data indicate that FcγRIIB-mediated inhibition of autoimmune hemolytic anemia is restricted to the IgG1 subclass and that galactosylation, but not sialylation, of IgG1 (but not other IgG subclasses) is critical for the interaction with FcγR, thereby determining the pathogenic potential of IgG1 autoantibodies.

  4. The changing faces of IgG4-related disease: Clinical manifestations and pathogenesis.

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    Islam, Arshia Duza; Selmi, Carlo; Datta-Mitra, Ananya; Sonu, Rebecca; Chen, Mingyi; Gershwin, M Eric; Raychaudhuri, Siba P

    2015-10-01

    Since the earliest reports in 2001, immunoglobulin G4 (IgG4)-related disease has been defined as an autoimmune systemic disease characterized by the lymphoplasmacytic infiltration of affected tissues leading to fibrosis and obliterative phlebitis along with elevated serum IgG4 levels. Prior to this unifying hypothesis, a plethora of clinical manifestations were considered as separate entities despite the similar laboratory profile. The pathology can be observed in virtually all organs and may thus be a challenging diagnosis, especially when the adequate clinical suspicion is not present or when obtaining a tissue biopsy is not feasible. Nonetheless, the most frequently involved organs are the pancreas and exocrine glands but these may be spared. Immunosuppressants lead to a prompt clinical response in virtually all cases and prevent histological sequelae and, as a consequence, an early differential diagnosis from other conditions, particularly infections and cancer, as well as an early treatment should be pursued. We describe herein two cases in which atypical disease manifestations were observed, i.e., one with recurrent neck lymph node enlargement and proptosis, and one with jaundice. Our understanding of the pathogenesis of IgG4-related disease is largely incomplete but data support a significant role for Th2 cytokines with the contribution of innate immunity factors such as Toll-like receptors, macrophages and basophils. Further, macrophages activated by IL4 overexpress B cell activating factors and contribute to chronic inflammation and the development of fibrosis. We cannot rule out the possibility that the largely variable disease phenotypes reflect different pathogenetic mechanisms and the tissue microenvironment may then contribute to the organ involvement.

  5. Specificity and Effector Functions of Human RSV-Specific IgG from Bovine Milk.

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    Gerco den Hartog

    Full Text Available BACKGROUND: Respiratory syncytial virus (RSV infection is the second most important cause of death in the first year of life, and early RSV infections are associated with the development of asthma. Breastfeeding and serum IgG have been shown to protect against RSV infection. Yet, many infants depend on bovine milk-based nutrition, which at present lacks intact immunoglobulins. OBJECTIVE: To investigate whether IgG purified from bovine milk (bIgG can modulate immune responses against human RSV. METHODS: ELISAs were performed to analyse binding of bIgG to human respiratory pathogens. bIgG or hRSV was coated to plates to assess dose-dependent binding of bIgG to human Fcγ receptors (FcγR or bIgG-mediated binding of myeloid cells to hRSV respectively. S. Epidermidis and RSV were used to test bIgG-mediated binding and internalisation of pathogens by myeloid cells. Finally, the ability of bIgG to neutralise infection of HEp2 cells by hRSV was evaluated. RESULTS: bIgG recognised human RSV, influenza haemagglutinin and Haemophilus influenza. bIgG bound to FcγRII on neutrophils, monocytes and macrophages, but not to FcγRI and FcγRIII, and could bind simultaneously to hRSV and human FcγRII on neutrophils. In addition, human neutrophils and dendritic cells internalised pathogens that were opsonised with bIgG. Finally, bIgG could prevent infection of HEp2 cells by hRSV. CONCLUSIONS: The data presented here show that bIgG binds to hRSV and other human respiratory pathogens and induces effector functions through binding to human FcγRII on phagocytes. Thus bovine IgG may contribute to immune protection against RSV.

  6. Hypermethylation of MST1 in IgG4-related autoimmune pancreatitis and rheumatoid arthritis

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    Fukuhara, Takataro; Tomiyama, Takashi [Division of Gastroenterology and Hepatology, The Third Department of Internal Medicine, JST CREST, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010 (Japan); Yasuda, Kaneki [Department of Urology and Andrology, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010 (Japan); Ueda, Yoshihiro [Department of Molecular Genetics, Institute of Biomedical Science, and JST CREST, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010 (Japan); Ozaki, Yoshio; Son, Yonsu; Nomura, Shosaku [Department of the First Department of Internal Medicine, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010 (Japan); Uchida, Kazushige; Okazaki, Kazuichi [Division of Gastroenterology and Hepatology, The Third Department of Internal Medicine, JST CREST, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010 (Japan); Kinashi, Tatsuo, E-mail: kinashi@takii.kmu.ac.jp [Department of Molecular Genetics, Institute of Biomedical Science, and JST CREST, Kansai Medical University, 2-5-1 Shin-machi, Hirakata, Osaka 573-1010 (Japan)

    2015-08-07

    The serine/threonine kinase Mst1 plays important roles in the control of immune cell trafficking, proliferation, and differentiation. Previously, we reported that Mst1 was required for thymocyte selection and regulatory T-cell functions, thereby the prevention of autoimmunity in mice. In humans, MST1 null mutations cause T-cell immunodeficiency and hypergammaglobulinemia with autoantibody production. RASSF5C(RAPL) is an activator of MST1 and it is frequently methylated in some tumors. Herein, we investigated methylation of the promoter regions of MST1 and RASSF5C(RAPL) in leukocytes from patients with IgG4-related autoimmune pancreatitis (AIP) and rheumatoid arthritis (RA). Increased number of CpG methylation in the 5′ region of MST1 was detected in AIP patients with extrapancreatic lesions, whereas AIP patients without extrapancreatic lesions were similar to controls. In RA patients, we detected a slight increased CpG methylation in MST1, although the overall number of methylation sites was lower than that of AIP patients with extrapancreatic lesions. There were no significant changes of the methylation levels of the CpG islands in the 5′ region of RASSF5C(RAPL) in leukocytes from AIP and RA patients. Consistently, we found a significantly down-regulated expression of MST1 in regulatory T cells of AIP patients. Our results suggest that the decreased expression of MST1 in regulatory T cells due to hypermethylation of the promoter contributes to the pathogenesis of IgG4-related AIP. - Highlights: • Mst1 controls immune cells trafficking, cell proliferation and differentiation. • Autoimmune pancreatitis (AIP) is an idiopathic pancreatitis affecting multiple organs. • Decreased MST1 expression and increased CpG methylation of promoter of MST1 in AIP. • Slight increased CpG methylation of MST1 in rheumatoid arthritis patients. • MST1 contributes pathogenesis of IgG4-related AIP.

  7. Toxoplasmosis serology: an efficient hemagglutination procedure to detect IgG and IgM antibodies

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    M.E. Camargo

    1989-08-01

    Full Text Available In search of an efficient but simple, low cost procedure for the serodiagnosis of Toxoplasmosis, especially suited for routine laboratories facing technical and budget limitations as in less developed countries, the diagnostic capability of Hematoxo® , an hemagglutination test for toxoplasmosis, was evaluated in relation to a battery of tests including IgG- and IgM-immunofluorescence tests, hemagglutination and an IgM-capture enzymatic assay. Detecting a little as 5 I.U. of IgG antitoxoplasma antibodies, Hematoxo® showed a straight agreement as to reactivity and non-reactivity for the 443 non-reactive and the 387 reactive serum samples, included in this study. In 23 cases presenting a serological pattern of acute toxoplasmosis and showing IgM antibodies, Hematoxo® could detect IgM