Anticuerpos IgG anti-toxoplasma gondii en pacientes con síntomas atribuíbles a toxoplasmosis

Directory of Open Access Journals (Sweden)

Jorge E. Collazo

1993-12-01

Full Text Available Se evaluaron 6.520 pacientes con síntomas atribuíbles a toxoplasmosis por la presencia de anticuerpos IgG anti - Toxoplasma gondii mediante la técnica de inmunofluorescencia indirecta. El 51,27% de los evaluados resultaron positivos.El 60,85% de los pacientes con trastornos oculares son seropositivos a IgG anti - T. gondii; seguidos del 56,25 y 48,10% para aquellos con trastornos generales y gineco-obstétricos. Los síntomas o manifestaciones que evidenciaron mayor porcentaje de positividad fueron: astenia, coriorretinitis, trastornos menstruales, cefaleas y uveítis.

Anticuerpos monoclonales contra la gonadotropina coriónica humana (hCG para su uso en la detección de embarazo Monoclonal antibodies against human chorionic gonadotropin (HCG for their use in pregnancy detection

Directory of Open Access Journals (Sweden)

Bertha V. Rodríguez Pendás

2004-12-01

Full Text Available Se reporta la generación de 2 anticuerpos monoclonales (AcM de ratón dirigidos contra la hormona gonadotropina coriónica humana (hCG, a partir de la inmunización de ratones BALB/c con hCG humana, purificada en el Instituto Nacional de Endocrinología (INEN. Los AcM obtenidos son de la clase IgG y fueron purificados a partir de líquido ascítico, mediante cromatografía de afinidad en proteína G Sepharosa. El estudio de afinidad y especificidad demostró que estos anticuerpos podían ser útiles en ensayos inmunoenzimáticos, con el uso de uno de ellos en el sistema microELISA, de nuestra institución, para la detección cualitativa de embarazo en orina.The generation of 2 mouse monoclonal antibodies directed against the human chorionic gonadotropin hormone (CGh, starting from the immunization of BALB/c mice with human CGh purified at the National Institute of Endocrinology (NIEN is reported. IgG monoclonal antibodies were obtained. They were purified starting from the ascitic fluid by affinity chromatography in protein G Sepharose. The affinity and specificity study showed that these antibodies could be useful in immunoenzimatic assays, using one of them in the microELISA system of our institution for the qualitative detection of pregnancy in urine.

Prevalencia de anticuerpos contra leptospira en población urbana humana y canina del departamento del tolima

OpenAIRE

Romero, Marlyn H.; Sánchez, Jorge A.; Hayek, Linda C.

2012-01-01

Objetivo Determinar la seroprevalencia de anticuerpos contra Leptospira sp. y los serovares dominantes, en población urbana humana y canina de tres municipios del departamento del Tolima, Colombia. Materiales y Métodos Se realizó un estudio epidemiológico trasversal con selección de sujetos por conveniencia en 62 barrios. Se obtuvieron muestras de 850 personas.y 850 caninos durante los meses de junio, julio y agosto de 2007, las cuales fueron procesadas utilizando la prueba de microaglutinaci...

Estandarización en Colombia de una prueba ELISA para la evaluación de los niveles séricos de anticuerpos IgG contra diez serotipos de Streptococcus pneumoniae

Directory of Open Access Journals (Sweden)

Lucía Carolina Leal-Esteban

2012-03-01

Conclusión. Esta prueba ELISA cuantifica de forma confiable los niveles de IgG sérica contra diez serotipos de S. pneumoniae y, de acuerdo con los resultados obtenidos en individuos sanos de nuestra población, en este trabajo se validan los parámetros internacionales para considerar adecuada la respuesta a la vacuna 23-valente contra este microorganismo.   DOI: http://dx.doi.org/10.7705/biomedica.v32i1.393

Prevalencia de anticuerpos contra dengue y leptospira en la población de Jáltipan, Veracruz Prevalence of dengue and leptospira antibodies in the state of Veracruz, Mexico

Directory of Open Access Journals (Sweden)

Joel Navarrete-Espinosa

2006-06-01

Full Text Available OBJETIVO: Conocer la prevalencia de anticuerpos contra dengue y leptospira en Jáltipan, Veracruz, México MATERIAL Y MÉTODOS: Estudio transversal en 500 habitantes de Jáltipan, Veracruz, mediante un muestreo por hogares, aplicación de cuestionario y toma de muestras sanguíneas. Se buscaron anticuerpos IgG y se evaluaron factores asociados a sus seroprevalencias mediante regresión logística RESULTADOS: La seroprevalencia global para denguevirus fue 79.6% (IC95% 76-81; los principales factores vinculados con la infección fueron la edad (pOBJECTIVE: To discover the prevalence of antibodies against denguevirus and leptospira. MATERIAL AND METHODS: A cross-sectional study was carried out in 500 inhabitants of Veracruz, Mexico through household sampling, administration of a questionnaire and collection of blood samples. The presence of IgG antibodies was determined and factors associated with seroprevalence were evaluated using a logistic regression model. RESULTS: Total denguevirus seroprevalence was 79.6% (IC95% 76-81. The main factors associated with infection were age and residence in neighborhoods with higher vectorial indices (RMP=2.94, IC95% 1.46-6.1. Overall seroprevalence against leptospira was 4% (IC95% 2-6. Prevalence was higher in the 25 to 44 years age group (35%, IC95% 15-59. Seroprevalence in individuals who referred to living with dogs, pigs, cows and rats was 25% (IC95% 0.63-80. Eighty-five percent of individuals who were leptospira positive were also dengue positive. CONCLUSIONS: The prevalence of denguevirus antibodies suggests the risk of serious dengue hemorrhagic outbreaks. Although leptospirosis prevalence was low, the coexistence of both agents was confirmed.

Efecto de medidas preventivas contra la toxoplasmosis en embarazadas

OpenAIRE

María Mercedes Santacruz; Reinaldo Heredia; Augusto Corredor Arjona

1992-01-01

La incidencia de la infección por Toxoplasma gondii, fue estudiada en el laboratorio de Parasitología del Instituto Nacional de Salud en los sueros de 1000 mujeres embarazadas, seleccionadas entre las que asistieron al control prenatal en la Caja de Previsión, durante los años de 1987 a 1990. En los sueros se midieron anticuerpos específicos IgG contra el Toxoplasma gondii, por la técnica de Inmunofluorescencia Indirecta. El 59% de las mujeres fueron positivas con títulos entre 1:16 y 1:4.096...

Obtención y caracterización de un anticuerpo específico contra la hormona luteinizante humana

Directory of Open Access Journals (Sweden)

Adriana Umaña

1996-12-01

Full Text Available En el presente trabajo se describe la obtención del anticuerpo policlonal específico contra la hormona luteinizante humana (HL. La hormona fue purificada a partir de una fracción rica en glicoproteínas, obtenida de hipófisis humanas, siguiendo el método desarrollado previamente en el proyecto basado en diferencias de solubilidad y constante dieléctrica entre las diferentes proteínas. El antisuero específico se obtuvo por inoculación del antígeno en conejos raza Nueva Zelanda y su producción controlada valorando el título por RIA. La caracterización parcial del antisuero se realizó mediante la determinación del título óptimo, afinidad, especificidad y su aplicabilidad para la cuantificación en términos de curva estándar y control de calidad, en comparación con un antisuero de referencia internacional. Los resultados indicaron que el anticuerpo obtenido puede emplearse en la cuantificación de HL por RIA.

Encefalitis autoinmunitaria asociada a anticuerpos contra el receptor N-metil-D-aspartato: presentación de dos casos

OpenAIRE

José Bustos; Yasmin Sánchez; Jhon Medina; Rommy Olivieri; Julián Mojica; Johan Ortiz

2017-01-01

La encefalitis asociada a anticuerpos contra receptores N-metil-D-aspartato es un síndrome neurológico que se presenta más comúnmente en mujeres jóvenes y frecuentemente se asocia al teratoma de ovario. Se caracteriza por un cuadro clínico agudo con síntomas generales inespecíficos que evoluciona hacia deterioro neurológico, psicosis y convulsiones; en su etapa más avanzada, se asocia con movimientos anormales y disautonomía. Se reportan dos casos en mujeres de 23 y 12 años. Dada su baja i...

Detección de Anticuerpos IgG Específicos para Sarampión mediante la Técnica de Inmunofluorescencia Indirecta

Directory of Open Access Journals (Sweden)

Mónica Nieto Z

2000-01-01

Full Text Available La técnica de ínmunofluorescencia indirecta para detectar anticuerpos IgG específicos a sarampión (IFI-IgG fue evaluada con la prueba de neutralización por reducción de placas (PRN con 128 muestras de suero de personas con edades entre 0 y 15 años, 64 con antecedente de vacunación y 64 sin éste antecedente. El IFI-IgG alcanzó una sensibilidad de 80,4% y una especificidad de 100,0%, mostrando ser una prueba sencilla, reproducible, y tener correlación con PRN, aunque menos sensible que ésta última, especialmente cuando la PRN estimó títulos bajos de anticuerpos. Se concluye que la técnica IFI-IgG puede ser usada como método de rutina para la confirmación de sarampión en muestras de fase aguda y convalesciente de la enfermedad (sueros pareados, así como para estudios de prevalencia de anticuerpos en la comunidad, aunque no reemplazaría a la PRN.

Prevalencia de anticuerpos antifosfolípidos en pacientes con conectivopatías

Directory of Open Access Journals (Sweden)

Óscar Emilio Ruiz-Franco

2011-07-01

Full Text Available Objetivos: Determinar la prevalencia de anticuerpos antifosfolípidos en pacientes con conectivopatías. Diseño: Estudio descriptivo transversal. Institución: Hospital Dos de Mayo e Instituto de Investigaciones Clínicas de la UNMSM, Lima, Perú. Participantes: Pacientes con diagnóstico de colagenopatía y sujetos sanos. Intervenciones: En 100 pacientes con diagnóstico de colagenopatía y 50 sujetos sanos, todos provenientes de Lima Metropolitana y atendidos entre enero y noviembre de 2008, se determinó fibrinógeno, tiempo de protrombina, tiempo parcial de tromboplastina activada, anticuerpos anticardiolipina y anticoagulante lúpico. Principales medidas de resultados: Presencia de anticuerpos anticardiolipina y anticoagulante lúpico. Resultados: Los pacientes con conectivopatías presentaron anticuerpos antifosfolípidos en 17%, anticoagulante lúpico en 13% y anticardiolipina IgG 4%. Al dividir el grupo por conectivopatías, en los 70 pacientes con lupus eritematoso sistémico 10 resultaron positivos para anticoagulante lúpico y 3 tuvieron anticardiolipina IgG; de los 30 pacientes con artritis reumatoide, 3 tuvieron anticoagulante lúpico positivo y 1 presentó anticardiolipina IgG. En el grupo de 50 personas sanas, solo se encontró un caso positivo para anticoagulante lúpico. Conclusiones: La prevalencia de anticuerpos antifosfolípidos en pacientes con conectivopatías fue 17%. La conectivopatía estudiada más frecuente fue el lupus eritematoso sistémico. El anticuerpo antifosfolípido más frecuente fue el anticoagulante lúpico.

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.

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

Directory of Open Access Journals (Sweden)

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.

Anticuerpos policlonales contra la proteína recombinante NS3 del virus del dengue

Directory of Open Access Journals (Sweden)

Liliana Morales

2017-01-01

Resultados. Los anticuerpos producidos fueron útiles en ensayos de Western blot e inmunofluorescencia y se reportó por primera vez un anticuerpo policlonal anti-NS3 que permitió la inmunoprecipitación de la proteína viral y la detecta con Western blot sin necesidad de inducir sobreexpresión de NS3 o de usar extractos de células marcados metabólicamente con radioisótopos. Conclusión. Las proteínas recombinantes expresadas y los anticuerpos producidos constituyen herramientas valiosas para estudiar procesos infecciosos del DENV que involucren a la proteína NS3 y evaluar pruebas dirigidas a interferir las funciones de esta proteína.

Control externo de la calidad del diagnóstico serológico del dengue en laboratorios de países de las Américas, 1996-2001

Directory of Open Access Journals (Sweden)

María G. Guzmán

2003-12-01

Full Text Available OBJETIVO: Dar a conocer los resultados de cuatro controles externos de la calidad del diagnóstico serológico del dengue realizados en la Región de las Américas en el período de 1996- 2001 y presentar los resultados obtenidos por los laboratorios participantes. MÉTODOS: Se realizaron controles externos de la calidad del diagnóstico serológico del dengue en 1996-1997, 1998-1999, 1999-2000 y 2000-2001. Paneles compuestos por 20 sueros (12 de estos positivos a anticuerpos IgM contra el dengue fueron enviados a laboratorios de la Región para que participaran en los controles realizados. Los sueros de los paneles eran negativos a anticuerpos contra el virus de la inmunodeficiencia humana y el virus de la hepatitis C, así como al antígeno de superficie de la hepatitis B, y fueron almacenados a -20 °C hasta su envío en refrigeración a los laboratorios participantes. La presencia de anticuerpos IgM se determinó mediante un ensayo inmunoenzimático (ELISA de captura, mientras que el título de anticuerpos IgG se determinó por inhibición de la hemoaglutinación o ELISA de IgG. Los resultados de la determinación de anticuerpos IgM contra el dengue que no coincidían con los del centro de referencia se consideraron discordantes. El título de anticuerpos IgG se consideró discordante cuando los resultados difirieron en dos diluciones o más con respecto al resultado del centro de referencia. RESULTADOS: Un total de 27 laboratorios recibió 59 paneles de sueros de 1996 a 2001, y se recibieron los resultados del análisis de 54 de esos paneles (91,5%. De 1 080 sueros (20 X 54, 95,6% coincidieron con el laboratorio de referencia en cuanto a los resultados de la detección de anticuerpos IgM contra el dengue. Además, en 47 paneles (87% la coincidencia con el laboratorio de referencia se observó en 90% de las muestras del panel o más. De los 27 paneles para los cuales se recibieron los resultados de los títulos de anticuerpos IgG contra el

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

Directory of Open Access Journals (Sweden)

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.

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

Directory of Open Access Journals (Sweden)

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.

Sensibilidad y especificidad de los exámenes de anticuerpos antigliadina y antiendomisio

OpenAIRE

LOZANO, WINSTON; MéNDEZ, VIRGINIA; FERREIRA, MARíA INéS; GUTIéRREZ, CARMEN

2002-01-01

La enfermedad celíaca se presenta con una gran heterogeneidad: formas sintomáticas, silentes y latentes. La determinación de anticuerpos antigliadina y antiendomisio es útil para definir a qué pacientes realizar biopsia de intestino delgado y para el seguimiento de los celíacos ya conocidos. Estas técnicas fueron incorporadas en 1994 en el Centro Hospitalario Pereira Rossell. Objetivo: conocer la sensibilidad y especificidad de los anticuerpos antigliadina (IgG) y antiendomisio (IgA) para el ...

ELISA Ureasa para selección primaria y monitoreo de anticuerpos monoclonales

Directory of Open Access Journals (Sweden)

Gladys Thalía Cortes

1990-12-01

Full Text Available Se empleó el método de Elisa Ureasa indirecto para detectar anticuerpos monoclonales obtenidos a partir de ratones inmunizados con merozoítos libres de Plasmodium falciparum. Se seleccionaron los anticuerpos monoclonales que mostraron ser muy estables en posteriores ensayos de caracterización. Los anticuerpos obtenidos no fueron específiCos contra antígeno de Plasmodium falciparum pero permitieron identificar la proteína Espectrina del citoesqueleto de eritrocito humano. En el ensayo fue empleado un antígeno de esquizontes concentrados y solubilizados. Se obtuvo la determinación del punto final de la reacción a través de lectura visual semicuantitativa. A partir de la enzima Ureasa de alta pureza que se encuentra disponible comercialmente y, empleando métodos muy sencillos se prepararon los reactivos utilizados en el ensayo.

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.

Determinación de anticuerpos contra patógenos virales y bacterianos seleccionados en la población de cerdos silvestres (Sus scrofa de la Reserva Natural Bahía Samborombón, Argentina

Directory of Open Access Journals (Sweden)

B. Carpinetti

2017-06-01

Full Text Available Los cerdos silvestres (Sus scrofa descienden de cruzamientos entre cerdos domésticos liberados durante la colonización con jabalíes salvajes euroasiáticos, liberados con propósitos cinegéticos. Son invasivos y su coexistencia con especies domésticas implica riesgos sanitarios. Argentina es considerada libre de fiebre aftosa (FA, peste porcina clásica (PPC y africana (PPA y síndrome reproductivo y respiratorio porcino (PRRS. La enfermedad de Aujeszky (EA y la leptospirosis son endémicas en ciertas áreas del país. El objetivo fue evaluar la presencia de ciertas enfermedades zoonóticas y/o de importancia para la producción animal y la conservación de la biodiversidad en cerdos silvestres de la Bahía de Samborombón. Se capturaron 118 animales. Se tomaron muestras de suero, tonsilas, músculo, intestino delgado, linfonódulos, entre otras. Se estudió la presencia de anticuerpos contra Brucella spp., coronavirus respiratorio porcino, virus de la estomatitis vesicular, de la FA, de la gastroenteritis transmisible porcina (TGEV, de la PPC, PPA, EA, PRRS y Leptospira spp. Se realizaron análisis bacteriológicos para Mycobacterium spp. Los resultados ratificaron la ausencia de las enfermedades exóticas e indicaron que 36 % de los animales presentó anticuerpos contra Leptospira interrogans serovar pomona y 62,5 % contra el virus de la EA. Estos resultados remarcan la importancia del monitoreo de la interfase productiva/silvestre en función de la salud pública, producción animal y conservación de la biodiversidad.

Prevalencia de anticuerpos séricos contra la bacteria Brucella sp. en una población humana tropical

Directory of Open Access Journals (Sweden)

Grettel Chanto

2007-06-01

Full Text Available La brucelosis es una enfermedad bacteriana generalizada con tendencia a la cronicidad si no se trata adecuadamente. El diagnóstico de laboratorio se realiza por el aislamiento e identificación del agente o en la mayoría de los casos mediante pruebas serológicas. En este estudio se informa la prevalencia de anticuerpos séricos contra Brucella sp. en habitantes de comunidades rurales de Cartago dedicadas principalmente a la ganadería de leche. Se analizó un total de 714 muestras representativas de la población mediante la técnica de aglutinación Rosa de Bengala en lámina (RBT y la prueba de aglutinación en microplaca (SAT. Se encontró una prevalencia de 0.87 %, y en ninguna persona seropositiva se demostró seroconversión. Aún, cuando el 71 % de la población refirió consumir leche no pasteurizada, no se encontró asociación estadísticamente significativa (1.09 %, IC 0.30-2.77 entre el consumo de leche no pasteurizada y la presencia de anticuerpos sugestivos de infección por Brucella sp. A pesar de ser una zona de alta prevalencia de brucelosis bovina por Brucella abortus, la ausencia de síntomas en la población y los bajos títulos de anticuerpos observados sugieren una escasa exposición previa al agente.Prevalence of serum antibodies for the bacterium Brucella sp. in a tropical human population. Brucellosis is a systemic bacterial disease that can last years if not treated properly. The laboratory diagnosis is made by serological tests or isolation of the agent. We studied the prevalence of antibodies against Brucella sp. in inhabitants of rural communities of Cartago, Costa Rica, who are dedicated mainly to dairy cattle activities. We analyzed 714 representative samples with the Rose Bengal plate agglutination test (RBT and the standard agglutination test in microplate (SAT. The overall prevalence was 0.87 %. No seroconversion was demonstrated for seropositive individuals. Even though 71 % of the population mentioned

Seroprevalencia de Helicobacter pylori en la población infantil ecuatoriana

OpenAIRE

Gómez, Néstor A; Salvador, Alexandra; Vargas, Paola E; Zapatier, Jorge A; Álvarez, José

2004-01-01

Objetivo: Determinar la prevalencia de anticuerpos IgG contra el Helicobacter pylori (anti-Hp) en la población infantil ecuatoriana y si existe relación con la presencia de sintomatología gastrointestinal recurrente. Materiales y Métodos: Se incluyeron niños de manera aleatoria de las diferentes áreas geográficas, y se investigó la presencia de anticuerpos séricos utilizando una prueba de ELISA. Asimismo, se relacionó la sintomatología gastrointestinal entre los pacientes con y sin anticuerpo...

Producción de anticuerpos policlonales IgG contra la proteina iduronato-2-sulfato sulfatasa y desarrollo de un sistema de detección para IDS humana recombinante.

Directory of Open Access Journals (Sweden)

Olga Peña

2005-06-01

Full Text Available Introducción. La enfermedad de Hunter es un trastorno lisosómico caracterizado por la deficiencia de la enzima iduronato-2-sulfato sulfatasa (IDS (EC 3.1.6.13. Esta enfermedad, al igual que muchos trastornos metabólicos, son patologías intratables mediante la terapéutica convencional; sin embargo, existe la posibilidad de ser tratada alternativamente mediante terapia génica o terapia de reemplazo enzimático. Objetivo. El Instituto de Errores Innatos del Metabolismo (IEIM ha desarrollado un sistema de expresión de sulfatasas para producir IDS humana recombinante (IDShr en Escherichia coli y Pichia pastoris, con resultados favorables. El objetivo principal de este trabajo fue desarrollar un sistema de detección de IDS humana recombinante. Materiales y métodos. Para el efecto, se inmunizaron con IDS comercial de TKT (Cambridge, MA dos conejos de raza Nueva Zelanda blanca y los anticuerpos purificados a partir del suero se utilizaron en el desarrollo de una técnica semicuantitativa por dot-blot. Diferentes muestras de extractos crudos de fermentaciones con P. pastoris y E. coli se procesaron con el fin de poder determinar la presencia de la enzima. Resultados. Se demostró que los anticuerpos eran específicos en el reconocimiento de la IDS sin presentar reactividad cruzada con proteínas contaminantes de los extractos crudos. Conclusión. Por consiguiente, los anticuerpos se podrán usar en el desarrollo de una técnica ELISA tipo sandwich como método de detección y cuantificación de la enzima y en procesos de purificación de la misma mediante cromatografía de afinidad.

PCSK-9: papel en las hipercolesterolemias y anticuerpos monoclonales específicos inhibitorios

Directory of Open Access Journals (Sweden)

Álvaro J. Ruiz

2017-11-01

Los anticuerpos monoclonales contra PCSK9, evolocumab y alirocumab, son una novedosa herramienta terapéutica de gran utilidad en los casos de hipercolesterolemia familiar heterocigota, en algunos casos de hipercolesterolemia familiar homocigota y de personas con alto riesgo cardiovascular, cuyos niveles de cLDL no pueden ser controlados con dosis máximas toleradas de las estatinas de mayor efectividad, además de ezetimibe y cambios en el estilo de vida.

Determinación de anticuerpos contra Cryptococcus neoformans en un grupo de colombófilos

Directory of Open Access Journals (Sweden)

Carmen Sofía Corrales

1987-12-01

Full Text Available Se evaluó la respuesta humoral, medida como anticuerpos específicos anti-Criptococcus neoformans, en 69 sueros de un grupo de colombófilos de Bogotá; grupo considerado como de alto riesgo dado el frecuente contacto con el material contaminado con el microorganismo. Además se estudiaron 65 sueros de un grupo control constituído por personas dedicadas a actividades diferentes. En las pruebas de inmunofluorescencia indirecta y aglutinación en tubo, no se evidenció diferencia entre los niveles de anticuerpos de ambos grupos. Se estudiaron adicionalmente 15 palomares con el objeto de aislar el microorganismo lo que se logró en el 66,7% de ellos. En 8 de los aislamientos se hizo serotipificación del hongo encontrándose que la totalidad correspondía a C. neoformans var. neoformans.

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

Directory of Open Access Journals (Sweden)

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.

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

Directory of Open Access Journals (Sweden)

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

Seroprevalence of dengue virus antibodies in asymptomatic Costa Rican children, 2002-2003: a pilot study La seroprevalencia de anticuerpos contra el virus del dengue en niños costarricenses asintomáticos, 2002-2003: estudio piloto

Directory of Open Access Journals (Sweden)

Roberto Iturrino-Monge

2006-07-01

Full Text Available OBJECTIVES: Since 1993 dengue has become more frequent in Costa Rica. Adults have been the most affected population, while children have remained virtually unharmed. So far no studies have investigated how many asymptomatic children have been affected by this virus. This pilot study documents the seroprevalence, measured as the presence of IgG antibodies, of dengue virus in asymptomatic children from two different geographical areas. METHODS: This descriptive, prospective epidemiologic study compared the presence of antibodies in children who live in a coastal region of a tropical country where dengue is endemic, and an inland area where dengue is not endemic. An enzyme-linked immunosorbent assay was used to test the serum for dengue virus IgG antibodies. None of the children had a prior history of dengue, fever, immunosuppressive therapy or underlying disease. RESULTS: During the period from July 2002 to July 2003, 103 children were recruited from each area. In the costal region we found a seroprevalence of 36.9%. In the inland area seroprevalence was 2.9% CONCLUSIONS: We found a substantial number of asymptomatic infections in Costa Rican children. This greatly increases the risk of dengue hemorrhagic fever or dengue shock syndrome in these children, in whom previous dengue infection had gone undetected. Preventive efforts should be targeted at the costal region due to the higher prevalence in this area.OBJETIVOS: Desde 1993, la frecuencia de dengue en Costa Rica ha venido aumentando. La población de adultos ha sido la más afectada, mientras que en los niños apenas se han presentado casos. Hasta el momento no se han realizado estudios para determinar cuántos niños asintomáticos se han visto afectados por el virus de la enfermedad. Este estudio piloto documenta la seroprevalencia de anticuerpos de tipo IgG contra el virus del dengue en niños asintomáticos procedentes de dos zonas geográficas distintas. MÉTODOS: En este estudio

Relevamiento serológico de anticuerpos contra enfermedades virales de interés sanitario en llamas (Lama glama de la provincia de Jujuy, Argentina

Directory of Open Access Journals (Sweden)

Elena S Barbieri

Full Text Available Las poblaciones de llamas de Argentina se concentran principalmente en la provincia de Jujuy; su explotación representa un importante recurso económico de las comunidades altoandinas. El objetivo de este trabajo fue evaluar la seroprevalencia de anticuerpos contra algunos agentes virales asociados a enfermedades de impacto productivo en rodeos de llamas de Jujuy. Se analizaron 349 sueros de llamas adultas de 6 departamentos de la puna jujeña ubicados por encima de los 3300 msnm. Se obtuvo una prevalencia del 100 % para rotavirus grupo A y del 70 % para el virus parainfluenza-3 bovino, mientras que no se detectaron reactores para herpesvirus bovino 1, virus de la diarrea viral bovina, influenza A humana (H1N1 e influenza equina (H3N8. Los resultados obtenidos confirman la amplia distribución de rotavirus y virus parainfluenza y la baja susceptibilidad a herpesvirus y pestivirus en las tropas de llamas de la puna jujeña.

DETECTION OF ANTIBODIES TO ANAPLASMA, BARTONELLA AND COXIELLA IN RURAL INHABITANTS OF THE CARIBBEAN AREA OF COLOMBIA

Directory of Open Access Journals (Sweden)

Salim Máttar

2006-12-01

Full Text Available Objetivo. Establecer la seroprevalencia de Bartonella spp, Anaplasma phagocytophilum (antesErlichia y Coexiella burnetii. Materiales y métodos. Se analizaron sueros representativos de unsector de la población en el año 2003, recolectados de personas que trabajan en actividades delcampo en los departamentos de Córdoba y Sucre que sirvieron como población base de las muestrasque se obtuvieron. Los trabajadores rurales elegidos a participar tenían entra 16 – 65 años deedad. Los sueros fueron examinados por IFA para detección de anticuerpos contra IgG para Bartonellaspp, Erlichia Anaplasma phagocytophilum y Coexiella burnetii. Resultados. La seroprevalencia deanticuerpos de todos los microorganismos estudiados fue de 56.8%. De 81 muestras de sueroanalizadas el 26.6% fueron seropositivas contra C. burnetii, el 37.7% tuvieron anticuerpos contraBartonella y el 20% de los individuos evaluados fueron seropositivos para Anaplasmaphagocytophilum. Conclusiones. Nuestros datos indican que la prevalencia de anticuerpos contraBartonella, A. phagocytophilum y C. burnetii son altos en nuestra región. Los resultados indicanque estas enfermedades zoonoticas son muy comunes en las personas que residen en el área delcaribe colombiano. Este estudio demuestra por primera vez la presencia de estos microorganismosen Colombia.

Asociación entre variables reproductivas y anticuerpos anti Neospora caninum en bovinos lecheros de un municipio de Colombia

Directory of Open Access Journals (Sweden)

Martín Orlando Pulido Medellín

2017-04-01

Full Text Available El objetivo fue determinar el porcentaje de vacas seropositivas a Neospora caninum y la identificación de las variables reproductivas que se encuentran relacionadas con la presencia de anticuerpos contra este protozoo. Se tomaron 1,000 muestras de sangre a hembras bovinas del municipio de Sotaquirá, Boyacá, las cuales fueron evaluadas por medio de ELISA indirecta. Se determinó una seroprevalencia de Neospora caninum del 45 %; las variables reproductivas asociadas con la positividad de N. caninum fueron: la presencia de distocia en el parto, el intervalo de edad (3-4 años y la raza de los bovinos (Holstein, mientras que las variables de presencia de aborto, inseminación artificial, muerte embrionaria, repetición de celo, presentación de terneros débiles al nacer y monta directa con toro, no presentaron relación con la positividad de los bovinos. Los resultados de este estudio muestran la presencia de anticuerpos contra Neospora caninum en animales de producción lechera, siendo esta prevalencia encontrada una muestra del riesgo potencial que representa esta enfermedad sobre el estado reproductivo dentro de los hatos.

Control externo de la calidad del diagnóstico serológico del dengue en laboratorios de países de las Américas, 1996-2001 Quality control of the serological diagnosis of dengue in laboratories throughout the Americas, 1996-2001

Directory of Open Access Journals (Sweden)

María G. Guzmán

2003-12-01

Full Text Available OBJETIVO: Dar a conocer los resultados de cuatro controles externos de la calidad del diagnóstico serológico del dengue realizados en la Región de las Américas en el período de 1996- 2001 y presentar los resultados obtenidos por los laboratorios participantes. MÉTODOS: Se realizaron controles externos de la calidad del diagnóstico serológico del dengue en 1996-1997, 1998-1999, 1999-2000 y 2000-2001. Paneles compuestos por 20 sueros (12 de estos positivos a anticuerpos IgM contra el dengue fueron enviados a laboratorios de la Región para que participaran en los controles realizados. Los sueros de los paneles eran negativos a anticuerpos contra el virus de la inmunodeficiencia humana y el virus de la hepatitis C, así como al antígeno de superficie de la hepatitis B, y fueron almacenados a -20 °C hasta su envío en refrigeración a los laboratorios participantes. La presencia de anticuerpos IgM se determinó mediante un ensayo inmunoenzimático (ELISA de captura, mientras que el título de anticuerpos IgG se determinó por inhibición de la hemoaglutinación o ELISA de IgG. Los resultados de la determinación de anticuerpos IgM contra el dengue que no coincidían con los del centro de referencia se consideraron discordantes. El título de anticuerpos IgG se consideró discordante cuando los resultados difirieron en dos diluciones o más con respecto al resultado del centro de referencia. RESULTADOS: Un total de 27 laboratorios recibió 59 paneles de sueros de 1996 a 2001, y se recibieron los resultados del análisis de 54 de esos paneles (91,5%. De 1 080 sueros (20 X 54, 95,6% coincidieron con el laboratorio de referencia en cuanto a los resultados de la detección de anticuerpos IgM contra el dengue. Además, en 47 paneles (87% la coincidencia con el laboratorio de referencia se observó en 90% de las muestras del panel o más. De los 27 paneles para los cuales se recibieron los resultados de los títulos de anticuerpos IgG contra el

Identidad de la vacuna contra Streptococcus pneumoniae “Quimi-Vio” mediante la técnica Dot Blot empleando los anticuerpos monoclonales contra los polisacáridos capsulares 1,5, 6B, 14 y 19F de la bacteria

Directory of Open Access Journals (Sweden)

Elizabeth González Aznar

2017-02-01

Full Text Available Streptococcus pneumoniae (neumococo constituye una de las principales causas de enfermedades infecciosas bacterianas, particularmente en niños menores de 2 años de edad. Basadas en el polisacárido capsular (PsC, su principal factor de virulencia, existen dos tipos de vacunas aprobadas para uso en humanos: las vacunas polisacarídicas planas y las vacunas polisacarídicas conjugadas. Quimi-Vio, la vacuna antineumocócica cubana, pertenece al segundo grupo y está compuesta por los PsC de los siete serotipos de mayor incidencia y circulación en Cuba (1, 5, 6B, 14, 18C, 19F y 23F. El objetivo de este trabajo fue realizar el ensayo de identidad de la vacuna cubana Quimi-Vio empleando los AcM contra los PsC 1, 5, 6B, 14, y 19F de Sp obtenidos recientemente en el Instituto Finlay de Vacunas, teniendo en cuenta que los Ensayos de identidad de las vacunas son requisito indispensable para la liberación final de los lotes. La técnica empleada para la realización del ensayo de identidad de Quimi-Vio fue el Dot Blot, donde empleando membrana de Nitrocelulosa se realizó la captura de tres lotes de vacuna Quimi-Vio y como control positivo de la técnica los respectivos PsC de los serotipos 1, 5, 6B, 14, y 19F sin conjugar y una vacuna comercial Prevenar-13. Para la identidad de los PsC de neumococo se emplearon los respectivos AcM a una concentración de 10µg/mL y como segundo anticuerpo anti IgG de ratón conjugado a peroxidasa teniendo en cuenta que los AcMs empleados son murinos. Cada AcM fue capaz de identificar de forma altamente especifica al PsC homologo (mismo serotipo, tanto en su forma no conjugada y monovalente como en el contexto de las vacunas Quimi-Vio y Prevenar 13V, donde además de estar conjugado al TT se encuentra mezclado con otros PsC de forma multivalente. La técnica Dot Blot empleando los AcMs contra los PsC serotipos 1, 5,6B, 14 y 19F permite identificar de forma específica cada PsC en la formulación multivalente, por lo

Anti-HBc testing for blood donations in areas with intermediate hepatitis B endemicity Detección de anticuerpos anti-HBc en sangre donada en lugares donde la hepatitis B tiene endemicidad intermedia

Directory of Open Access Journals (Sweden)

Celina Maria Turchi Martelli

1999-07-01

Full Text Available En otros estudios se ha evaluado el menor riesgo de infecciones transmitidas por transfusión sanguínea que acarrea el tamizaje de anticuerpos contra los antígenos nucleares de la hepatitis B (anti-HBc, sumado a la prueba detectora de antígenos de superficie (HbsAg. No obstante, la mayoría de estos estudios se basaron en datos procedentes de zonas con baja endemicidad por hepatitis B o de bancos de sangre de países desarrollados, donde la mayoría de la sangre proviene de personas que han donado previamente. A fin de examinar los pros y los contras del tamizaje de anticuerpos anti-HBc en el Brasil, los autores describen los antecedentes y la interpretación de las pruebas de tamizaje para prevenir la hepatitis postransfusión. También presentan los datos sobre el tamizaje de la hepatitis B en todas las regiones del Brasil. No hay pruebas suficientes para suspender el tamizaje de los anticuerpos anti-HBc en el país. Debe darse alta prioridad a comparar el costo-efectividad de un marcador basado en la biología molecular con el de la actual prueba detectora de anticuerpos anti-HBc aplicada comúnmente, a fin de mejorar las medidas de tamizaje que garantizan la inocuidad de la sangre.

Seroprevalencia de Hantavirus, Rickettsia y Chikungunya en población indígena del municipio de Tuchín, Córdoba

Directory of Open Access Journals (Sweden)

Samia Barrera

Full Text Available Introducción: La vigilancia de las enfermedades transmitidas por vectores es importante para establecer medidas de control en salud pública. Las poblaciones indígenas de Córdoba viven en condiciones geoclimáticas que favorecen la presencia de vectores que podrían permitir la diseminación y aparición de hantavirosis, rickettsiosis y fiebre por el virus Chikungunya. Objetivo: Establecer la seroprevalencia de Hantavirus, Rickettsia sp. y Chikungunya en la población indígena de Tuchín, Córdoba. Materiales y métodos: Se realizó un estudio descriptivo de corte transversal en 190 individuos del resguardo indígena del municipio de Tuchín; el muestreo fue realizado entre agosto y diciembre del 2012. La detección de anticuerpos IgG contra Hantavirus se llevó a cabo con la prueba IgG DxSelectTM (Focus Technologies, EL1600G, California, EE. UU., anticuerpos IgG contra Rickettsia sp. se determinaron por inmunofluorescencia indirecta y se realizó detección de anticuerpos IgG contra el virus Chikungunya mediante ELISA de captura (Nova-Tec, inmunodiagnostica GmbH, CHIG0590, Alemania. Resultados: De 190 sueros analizados, el 5,2% (10/190 fueron positivos para Rickettsia sp. del grupo de la fiebre manchada, para Hantavirus 7 de 87 (8% fueron positivos y no se encontraron positivos para Chikungunya. No se encontraron diferencias significativas (p = 0,05 entre los seropositivos de Hantavirus y Rickettsia sp. para las variables género, edad y ocupación. Conclusiones: Los hallazgos demuestran exposición previa a Rickettsia sp. y a Hantavirus en la población indígena de Tuchín. Los resultados pueden ser útiles para establecer una alerta sobre estas fiebres hemorrágicas. Aunque no se hallaron seropositivos para Chikungunya, este fue el primer trabajo de vigilancia epidemiológica realizado en Colombia sobre este virus.

Anticuerpos anti-HLA y rechazo agudo del injerto renal en los niños

OpenAIRE

Galeas, Rubén Arturo; Gomezchico-Velasco, Rebeca; Valverde, Saúl; Ramón-García, Guillermo; Velásquez-Jones, Luis; Romero-Navarro, Benjamín; Hernández, Ana María; Vargas, Arindal; Leo, Claudia de; Medeiros, Mara

2010-01-01

Introducción. A pesar de que las nuevas terapias inmunosupresoras han mejorado notablemente la evolución clínica de los trasplantes renales, los rechazos agudo y crónico siguen limitando la sobrevida a largo plazo del injerto. En base a lo anterior, el objetivo de este estudio fue determinar la presencia de anticuerpos séricos contra antígenos de histocompatibilidad (HLA) clase I y clase II en niños con rechazo agudo del injerto renal. Métodos. Se realizó un estudio clínico prospectivo en pac...

Estudio de la enfermedad celíaca mediante el desarrollo de un ensayo inmunocromatográfico para la determinación de anticuerpos antitransglutaminasa

OpenAIRE

Galván Cabrera, José Armando

2012-01-01

En el presente trabajo se muestran los resultados del desarrollo y la evaluación de un sistema inmunocromatográfico rápido y sencillo para la detección de anticuerpos antitransglutaminasa, que es un importante marcador serológico en el diagnóstico de la enfermedad celíaca (EC). Con este sistema se pueden detectar en una misma prueba tanto anticuerpos de tipo IgA como IgG. Se obtuvieron niveles de sensibilidad, especificidad y concordancia elevados cuando se compararon con la biopsia de yeyuno...

Cuantificación de IGG contra los componentes inmunogénicos de VA-ENGOC-BC en plasma de lactantes vacunados

Directory of Open Access Journals (Sweden)

José Rodríguez Canosa

1997-04-01

Full Text Available Debido a las características particulares de la respuesta inmune en lactantes, así como a la eficacia mostrada por la vacuna cubana antimeningocóccica VA-MENGOC-BC, nos propusimos cuantificar la respuesta de la inmunoglobulina G contra los componentes inmunogénicos de los meningococos B y C presentes en la vacuna, en lactantes vacunados. Se tomó muestra por punción capilar a 109 lactantes entre 3 y 6 meses de edad antes de la vacunación a los 31,4 ± 2 días después de la primera y 32,3 ± días después de la segunda dosis vacunal. Se determinaron las concentraciones de inmunoglobulina G contra cada inmunógeno de la vacuna. Los niveles de inmunoglobulina G específica prevacunación, fueron elevadas contra el meningococo C. Se produjo un incremento estadísticamente significativo de anticuerpos para ambos inmunógenos después de la primera y segunda dosis, más marcado contra el meningococo C en la primera y para el meningococo B en la segunda, lo que apoya la presencia de memoria inmunológicaDue to the particular characteristics of the immune response in infants and to the efficacy shown by the Cuban antimeningococcal vaccine denominated VA-MENGOC-BC, we propose ourselves to quantify the response of immunoglobulin G against the immunogenic components of the meningococci B and C present in the vaccine among the vaccinated infants. The sample was taken by capillary puncture from 109 infants between 3 and 6 months before vaccination, at 31.4±2 days after the first dose and at 32.3± days after the second one. The concentrations of immunoglobulin G against each immunogen of the vaccine were determined. The levels of prevaccination specific immunoglobulin G were elevated against meningococcus C. There was a statistically significant increase of atibodies for both immunogens after the first and second dose. It was more marked against meningococcus C in the first, and for meningococcus B in the secons one, which supports the presence of

Evaluación serológica de una proteína recombinante a partir de una cepa aislada del virus de la fiebre amarilla en el Perú: un estudio piloto

Directory of Open Access Journals (Sweden)

Carlos Yábar V

2003-10-01

Full Text Available Objetivo: Evaluar serológicamente una proteína recombinante de 66 kDa (Er66 de una cepa del virus de la fiebre amarilla aislada en el Perú usando anticuerpos inmunoreactivos. Material y métodos: La proteína Er66 fue expresada in vitro en la bacteria Escherichia coli y enfrentada a títulos de 1/100, 1/50 y 1/25 de anticuerpos monoclonales, y a sueros con anticuerpos IgM e IgG inmunoreactivos contra el virus de la fiebre amarilla mediante ensayos de Western blot (WB. Asimismo, se evaluaron proteínas totales de las cepas de referencia del virus dengue (DEN y fiebre amarilla como controles de antigenicidad. Resultados: La proteína recombinante Er66 presentó antigenicidad contra títulos de 1/50 y 1/25 de anticuerpo monoclonal (MAB8701; sin embargo, no se observó inmunoreactividad en sueros positivos para fiebre amarilla y dengue. Los ensayos con extractos crudos de la cepa de fiebre amarilla Asibi 17D (PTFA revelaron que la antigenicidad de las proteínas virales comprendidas entre 60 y 80 kDa fue afectada negativamente a temperaturas desnaturalizantes de 100°C. En cambio, tratamientos con ß-mercaptoetanol sin calor generó un aumento de la antigenicidad de dichas proteínas. Siguiendo este mismo principio, la proteína Er66 fue sometida a tratamientos desnaturalizantes con ß-mercaptoetanol sin incluir calor y fue enfrentada nuevamente a los sueros reactivos. El resultado final reveló que la proteína Er66 generó inmunoreactividad frente a sueros con altos títulos de anticuerpos IgM e IgG para fiebre amarilla mientras que en otras muestras se observó una débil señal. Conclusiones: Los datos obtenidos en este trabajo demuestran que la Er66 pudo ser reconocida por anticuerpos IgM e IgG específicos para fiebre amarilla presentes en sueros de pacientes infectados. Los datos presentados en este artículo sugieren el uso de proteínas recombinantes como posibles candidatas de valor diagnóstico para la FA.

Producción y caracterización de un anticuerpo policlonal dirigido contra la fosfoproteína del virus de la rabia

Directory of Open Access Journals (Sweden)

Nadia Yadira Castañeda

2007-06-01

Materiales y métodos. El gen P que codifica para la proteína P del virus de la rabia, fue amplificado por reacción en cadena de la polimerasa de transcriptasa reversa y clonado en el vector de expresión PinPointTM Xa-1 T (PROMEGA. La proteína recombinante P fue expresada en E. coli purificada por cromatografía de afinidad y usada para la producción del anticuerpo policlonal anti-P. El anticuerpo obtenido fue purificado y caracterizado por inmunocitoquímica con un sistema enzimático, inmunofluorescencia, Cell-ELISA fluorométrica y Western blotting. Resultados. La proteína recombinante se expresó eficientemente como una proteína de fusión biotinilada de aproximadamente 50 kd, que corresponde a la forma completa de la proteína P del virus de la rabia. El anticuerpo policlonal anti-P detectó con alta especificidad la proteína P en cultivos de neuronas sensoriales infectados con el virus de la rabia. Conclusión. La proteína P recombinante expresada en E. coli se constituyó en un antígeno específico para producir un anticuerpo policlonal que reconoce la proteína P nativa en células infectadas con el virus de la rabia.

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

Directory of Open Access Journals (Sweden)

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

PROTEINA BLANCO DE LOS AUTO-ANTICUERPOS ANTI-P ASOCIADOS A LUPUS NEUROPSIQUATRICO: FUNCION Y MECANISMOS PATOGENICOS

OpenAIRE

segovia miranda, fabian josue

2012-01-01

El potencial patogénico de los auto-anticuerpos en las disfunciones del sistema nervioso central ha atraído gran interés en los últimos años. La identificación de autoanticuerpos neuropatogénicos dirigidos contra componentes de la superficie neuronal ayuda a entender la influencia que el sistema inmune puede ejercer sobre procesos que involucran memoria, cognición y comportamiento. También provee herramientas para entender mejor la función de componentes ya conocidos, o de nuevos com...

Preparación de un conjugado peroxidasa-anti IgG humana (cadena en conejo Preparation of a peroxidase-anti human IgG conjugate (chain g in rabbit

Directory of Open Access Journals (Sweden)

Julio C Merlín Linares

2001-08-01

Full Text Available Se preparó un conjugado con peroxidasa a partir de los anticuerpos específicos aislados de un suero de conejo anti cadenas g de la IgG humana. Los anticuerpos específicos se aislaron por cromatografía de afinidad, y el conjugado se preparó por el método de oxidación con peryodato. El conjugado obtenido presentó una relación molar IgG/peroxidasa de 1,07, un valor de RZ de 0,33 y resultó evaluado satisfactoriamente en cuanto a su especificidad y reactividad en los ensayos inmunoenzimáticos realizadosA peroxidase conjugate was prepared starting from the specific antibodies isolated from an anti-chain rabbit serum and from human IgG. The specific antibodies were isolated by affinity chromatography and the conjugate was prepared by the method of oxidation with periodate. The conjugate obtained presented a molar IgG/peroxidase relation of 1.07, a RZ value of 0.33 and it was satisfactorily evaluated as regards its specificity and reactivity in the immunoenzimatic assays carried out

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

Directory of Open Access Journals (Sweden)

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.

Determinación de anticuerpos contra Cryptococcus neoformans en un grupo de colombófilos

OpenAIRE

Carmen Sofía Corrales; Nelly Ordóñez; Luisa Marcela Londoño; Elizabeth Castañeda

1987-01-01

Se evaluó la respuesta humoral, medida como anticuerpos específicos anti-Criptococcus neoformans, en 69 sueros de un grupo de colombófilos de Bogotá; grupo considerado como de alto riesgo dado el frecuente contacto con el material contaminado con el microorganismo. Además se estudiaron 65 sueros de un grupo control constituído por personas dedicadas a actividades diferentes. En las pruebas de inmunofluorescencia indirecta y aglutinación en tubo, no se evidenció diferencia entre los niveles de...

Asociación entre variables reproductivas y anticuerpos anti Neospora caninum en bovinos lecheros de un municipio de Colombia

OpenAIRE

Martín Orlando Pulido Medellín; Adriana María Díaz Anaya; Roy José Andrade Becerra

2017-01-01

El objetivo fue determinar el porcentaje de vacas seropositivas a Neospora caninum y la identificación de las variables reproductivas que se encuentran relacionadas con la presencia de anticuerpos contra este protozoo. Se tomaron 1,000 muestras de sangre a hembras bovinas del municipio de Sotaquirá, Boyacá, las cuales fueron evaluadas por medio de ELISA indirecta. Se determinó una seroprevalencia de Neospora caninum del 45 %; las variables reproductivas asociadas con la positividad de N. cani...

Inducción de IgA e IgG anti-omp48 en conejos inmunizados intragástricamente con una fracción extracelular de Aeromonas veronii

Directory of Open Access Journals (Sweden)

Eduardo Ruiz-Bustos

2011-01-01

Full Text Available Una proteína de membrana externa de 48 kDa (omp48 de Aeromonas veronii (A. veronii, que tiene afinidad por secreciones de la mucosa (tal como mucina, lactoferrina, inmunoglobulinas o colágeno, induce una respuesta inmune estadísticamente significativa al ser administrada intragástricamente a conejos blancos de Nueva Zelanda. Estudios posteriores mostraron una correlación positiva entre las inmunoglobulinas y la respuesta de células productoras de anticuerpo (CPA. La administración intragástrica del antígeno induce una respuesta vigorosa, tanto local como sistémica, principalmente de inmunoglobulinas A y G contra la omp48 de A. veronii. Estas se evidenciaron por la presencia de (i células productoras de anticuerpos contra omp48 en el tracto gastrointestinal, bazo y sangre, y (ii elevados niveles de anticuerpos circulantes.La estimulación del sistema inmune de mucosa mediante antígenos bacterianos inmunogénicos, puede ser una importante alternativa para el control y prevención de enfermedades asociadas a Aeromonas.

Presencia de anticuerpos IgG del virus de la rubéola, virus herpes simple y citomegalovirus en embarazadas residentes en Ciudad de La Habana

Directory of Open Access Journals (Sweden)

Carmen Acosta

2001-06-01

Full Text Available Se realizó un estudio seroepidemiológico con 207 gestantes, residentes en el municipio Marianao de Ciudad de la Habana, con la finalidad de conocer la presencia de anticuerpos IgG anti-rubéola, anti-citomegalovirus y anti-herpes simple (1 y 2; el nivel de positividad se expresó como la relación de la fluorescencia de la muestra con respecto a la del control positivo, para un nivel de corte de 0,3 para rubéola, 0,2 para citomegalovirus y 0,185 para herpes simple. Las seroconversiones se expresaron como el incremento de esta relación con respecto a la determinación realizada en el primer trimestre de embarazo. El 91,3% de las gestantes resultaron positivas para rubéola, el 92,7% para citomegalovirus y el 98,1% para herpes simple. Se sugiere la valoración de aspectos fundamentales relacionados con estas infecciones dentro del Programa Nacional de Atención a las Embarazadas.

Prevalence of IgG varicella zoster virus antibodies in the Kuikuro and Kaiabi indigenous communities in Xingu National Park, Brazil, before varicella vaccination Prevalência de anticorpos IgG contra o vírus varicela zoster nas aldeias indígenas Kuikuro e Kaiabi do Parque Nacional do Xingu, Brasil, antes da vacinação contra varicela

Directory of Open Access Journals (Sweden)

Manuel Mindlin Lafer

2005-06-01

Full Text Available The purpose of the study was to estimate the prevalence of IgG antibodies against varicella zoster virus (VZV in the two most populated indigenous ethnic groups from Xingu Indigenous National Park, in Brazil, prior to the introduction of vaccination against the disease, and to determine the positive and the negative predictive values of a history of varicella infection. In 2001, 589 inhabitants of two Kuikuro villages and three Kaiabi villages were evaluated and provided information concerning previous varicella infection. An indirect immunosorbent assay (ELISA to detect IgG anti-VZV antibodies was performed in 224 blood samples - volunteer selection had no interference of anamnesis. IgG prevalence was 80.8% (95% Confidence Interval: 76% - 86%. The seroepidemiology of varicella in Xingu National Park prior to varicella vaccine introduction was comparable to the Brazilian national seroprevalence described in the literature, and so were the positive (98% and the negative predictive value (41% of the referred history.O objetivo do estudo foi aferir a prevalência de anticorpos IgG contra o Vírus Varicela-Zoster (VVZ nos dois grupos étnicos indígenas mais povoados do Parque Nacional Indígena do Xingu, Brasil, antes da introdução da vacinação contra a doença, e determinar os valores preditivos positivo e negativo da história de infecção de varicela. Em 2001, 589 habitantes de duas aldeias Kuikuro e três aldeias Kaiabi foram avaliados e forneceram dados referentes à infecção prévia por varicela. Um ensaio imunoenzimático indireto (ELISA foi realizado em 224 amostras de sangue para detectar anticorpos IgG anti-VVZ - a seleção de voluntários não teve interferência da anamnese. A prevalência de IgG foi de 80,8% (Intervalo de Confiança de 95%: 76% - 86%. A soroepidemiologia de varicela no Parque Nacional do Xingu antes da introdução da vacina foi comparável à soroprevalência nacional descrita na literatura, assim como os

Prevalencia de anticuerpos antirrubéola y antiparvovirus B19 en embarazadas de la ciudad de Córdoba y en mujeres en edad fértil de la ciudad de Villa Mercedes, San Luis Prevalence of anti-rubella and anti-parvovirus B19 antibodies in pregnant women in the city of Córdoba, and in women of fertile age in the city of Villa Mercedes, province of San Luis

Directory of Open Access Journals (Sweden)

M. S. Pedranti

2007-03-01

Full Text Available Se determinó la prevalencia de anticuerpos contra virus rubéola en 100 muestras de suero de mujeres embarazadas que concurrían a chequeos de rutina en una institución privada de la ciudad de Córdoba y en 100 muestras de suero de mujeres en edad fértil (42 de ellas embarazadas que concurrían a dispensarios de la ciudad de Villa Mercedes, provincia de San Luis. En las muestras tomadas en la ciudad de Córdoba también se determinaron anticuerpos IgG contra parvovirus B19. Por inhibición de la hemoaglutinación, los resultados de los sueros de Córdoba mostraron una prevalencia de anticuerpos antirrubéola del 98%; en las muestras de Villa Mercedes se observó una prevalencia del 96%. La prevalencia de anticuerpos antiparvovirus B19 en los sueros de Córdoba fue del 66%. Estos datos se asemejan a los de la bibliografía mundial y fundamentan el interés en continuar estudios de este tipo para monitorear el plan de inmunización para rubéola, que en Argentina se lleva a cabo desde 1997, como así también la relevancia de la determinación de IgM antiparvovirus B19 en aquellas embarazadas sintomáticas con resultado negativo para rubéola, a fin de elaborar un diagnóstico diferencial.We determined the prevalence of anti-rubella antibodies in 100 serum samples from pregnant women who attended routine examination at a private institution in the city of Córdoba, and in 100 serum samples from women of gestational age, 42 of whom were pregnant, attending health centres in the city of Villa Mercedes, province of San Luis. IgG antibodies against parvovirus B19 were also determined in the serum samples from Córdoba. Using the hemmagglutination inhibition test, we found a 98 % prevalence of anti-rubella antibodies among pregnant women in Córdoba and of 96 % among the women in Villa Mercedes, whereas the prevalence of anti-parvovirus B19 was 66% in the serum samples from Córdoba. These results coincide with those reported for other cities in the

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

Directory of Open Access Journals (Sweden)

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.

Anticorpos contra LDL-ox e síndrome coronariana aguda Anticuerpos contra LDL-ox y síndrome coronario agudo Antibodies against OxLDL and acute coronary syndrome

Directory of Open Access Journals (Sweden)

Ana Maria Brito Medeiros

2010-07-01

Full Text Available FUNDAMENTO: A oxidação da lipoproteína de baixa densidade (LDL-ox induz à formação de epítopos imunogênicos na molécula. A presença de autoanticorpos contra a LDL-ox tem sido demonstrada no soro de pacientes com doença arterial coronariana (DAC. Contudo, o papel desses autoanticorpos na fisiopatologia das síndromes coronarianas agudas (SCA e o seu significado clínico permanecem indefinidos. OBJETIVO: Avaliar a associação entre autoanticorpos contra a LDL-ox e SCA. MÉTODOS: Os títulos de imunoglobulina G autoanticorpos contra a LDL-ox por cobre (antiLDL-ox e contra o peptídeo sintético D derivado da apolipoproteína B (antipeptD foram determinados por ensaio imunoenzimático (ELISA em 90 pacientes, nas primeiras 12h de SCA (casos e em 90 pacientes com DAC crônica (controles. RESULTADOS: Os resultados mostraram que os títulos de antiLDL-ox foram significativamente mais elevados (p = 0,017 nos casos (0,40 ± 0,22, do que nos controles (0,33 ± 0,23. Por outro lado, os títulos de antipeptD foram significativamente menores (p FUNDAMENTO: La oxidación de la lipoproteína de baja densidad (LDL-ox induce a la formación de epítopos inmunogénicos en la molécula. La presencia de autoanticuerpos contra la LDL-ox ha sido demostrada en el suero de pacientes con enfermedad arterial coronaria (EAC. No obstante eso, el papel de esos autoanticuerpos en la fisiopatología de los síndromes coronarios agudos (SCA y su significado clínico permanecen indefinidos. OBJETIVO: Evaluar la asociación entre autoanticuerpos contra la LDL-ox y SCA. MÉTODOS: Los títulos de inmunoglobulina G autoanticuerpos contra la LDL-ox por cobre (antiLDL-ox y contra el péptido sintético D derivado de la apolipoproteína B (antipeptD fueron determinados por ensayo inmunoenzimático (ELISA en 90 pacientes, en las primeras 12h de SCA (casos y en 90 pacientes con EAC crónica (controles. RESULTADOS: Los resultados mostraron que los títulos de antiLDL-ox fueron

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

Directory of Open Access Journals (Sweden)

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

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

Directory of Open Access Journals (Sweden)

Olga María Bermúdez

2004-07-01

de la subclase 1 en los pacientes con gastritis atrófica y adenocarcinoma gástrico, indica que la presencia de anticuerpos hacia esta proteína podría ser usada como un marcador de cáncer, mientras que el estudio del reconocimiento de los demás antígenos principales (70 kDa, 90 kDA y VacA puede convertirse en una herramienta de importante valor para la caracterización de cada enfermedad.

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

Directory of Open Access Journals (Sweden)

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

Producción de anticuerpos policlonales IgG contra una proteína con actividad de óxido nítrico sintetasa de Toxoplasma gondii recombinante (NOS-Tg-r y marcación inmunológica en taquizoítoso Production of Polyclonal Antibodies against Toxoplasma gondii Recombinant protein with Nitric Oxide Synthase activity and immunologic marking in Tachyzoites

Directory of Open Access Journals (Sweden)

Jonathan Mauricio Padilla-Londoño

2008-06-01

Full Text Available La enzima óxido nítrico sintetasa ha sido estudiada en mamíferos; en los últimos años se ha descrito que existe también en protozoos, pero se desconocen aspectos importantes de su función. Se logró producir anticuerpos policlonales contra la proteína recombinante con actividad de óxido nítrico sintetasa (NOS-Tg-r de Toxoplasma gondii y realizar marcación inmunológica en taquizoítos. Se usaron dos conejos Nueva Zelanda (Oryctolagus cuniculusque se inmunizaron por vía intramuscular con NOS-Tg-r, y dos tipos de adyuvantes, hidróxido de aluminio y adyuvante de Freund. Se comprobó la presencia de anticuerpos policlonales con la técnica de ensayo inmunoenzimático indirecto. Los resultados obtenidos mostraron que a NOS-Tg-r con adyuvante de Freund indujo mayor respuesta inmune que la de la NOS-Tg-r con hidróxido aluminio p 0,005. Para verificar si había reacción cruzada, se realizó una prueba ELISA utilizando como antígenos: metaloproteasa de T. gondii recombinante, cisteína proteasa 5 de Entamoeba histolytica recombinante, albúmina al 2%, hidróxido de aluminio y adyuvante de Freund. Los valores obtenidos con sueros preinmunes y contra proteínas alternas no superaron el punto de corte (0,069, lo cual indica que los anticuerpos policlonales obtenidos son específicos para NOS-Tg-r. Se realizó marcación inmunológica en taquizoítos de Toxoplasma gondii con inmunofluorescencia indirecta que mostró una marcación difusa a nivel de citoplasma y confirmó la presencia de esta proteína en los taquizoítos.The nitric oxide synthase (NOSis an enzyme well described on mammals but little is known about the role of these enzymes on pathogenic parasites. We produced polyclonal antibodies against a recombinant NOS enzyme from Toxoplasma gondii nd e lso er formed n mmunol locali zation of the enzyme on tachyzoites. We used two New Zealand rabbits (Oryctolagus cuniculus to perform intramuscular immunization and we used two types of

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

Detección de anticuerpos circulantes en donantes de sangre en México Detection of antibodies present in blood donors in Mexico

Directory of Open Access Journals (Sweden)

José J. Serrano Machuca

2009-10-01

Full Text Available OBJETIVO: Detectar anticuerpos circulantes contra seis infecciones transmisibles por sangre en donantes de una institución de seguridad social en Querétaro, México. MÉTODO: Se realizó un estudio transversal descriptivo retrospectivo con datos del Banco de Sangre del Hospital General Regional No. 1, del Instituto Mexicano del Seguro Social (IMSS. Se registraron 6 929 donantes, entre los cuales se identificó a los diagnosticados con cualquier anticuerpo circulante contra brucelosis, enfermedad de Chagas, hepatitis B, hepatitis C, sífilis y VIH. Los casos identificados con cualquiera de estas infecciones se analizaron según edad, género, estado civil, escolaridad, lugar de residencia y número de donaciones. Para estimar la prevalencia total se dividió el número de personas identificadas con cualquiera de los anticuerpos circulantes por el total de donantes, y luego por cada una de las diferentes infecciones. RESULTADOS: De los 6 929 donantes, 144 fueron detectados con algún tipo de anticuerpo circulante de las seis infecciones potencialmente transmisibles por sangre, lo cual da una prevalencia total de 2,07% (0-4,4. Las prevalencias más altas por tipo de anticuerpo circulante correspondieron a la hepatitis C, con 0,721% (IC 95%, 0,522-0,920, y a la enfermedad de Chagas, con 0,649% (IC 95%, 0,460-0,838. CONCLUSIÓN: La identificación de la prevalencia de donantes de sangre con anticuerpos circulantes de alguna de estas seis infecciones potencialmente transmisibles por vía sanguínea permite establecer un perfil epidemiológico propio del banco de sangre del Hospital General Regional No. 1. La enfermedad de Chagas se presenta como emergente, dando pauta a dirigir los esfuerzos para su control.OBJECTIVE: To detect antibodies to six potentially blood-borne infections in blood donors at a social security institute in Querétaro, Mexico. METHODS: A cross-sectional, retrospective, descriptive study was performed using data from the blood

¿Es necesario investigar anticuerpos IgM contra el virus de la hepatitis A cuando el enzimograma hepático es normal?

Directory of Open Access Journals (Sweden)

C. Coitinho

Full Text Available La hepatitis por virus A (VHA es la más frecuente de las hepatitis virales en el mundo, especialmente en los países subdesarrollados. Donde esta enfermedad es endémica, se suelen realizar un gran número de estudios de laboratorio para confirmarla. El objetivo del presente trabajo fue evaluar la utilidad de investigar anticuerpos IgM anti hepatitis A (IgM anti-VHA para el diagnóstico de la VHA en pacientes con niveles séricos normales de aspartato y alanina aminotransferasas (AST/ALT. Todos los pacientes que concurrieron al laboratorio con solicitud de enzimograma hepático y anticuerpos IgM anti-VHA durante el período octubre 2005-marzo 2006 fueron evaluados en este estudio. Los datos clínicos más frecuentes fueron presunción de hepatitis e ictericia (27,5 y 12,7%. La determinación de IgM anti-VHA se realizó por ensayo inmunoenzimático de micropartículas (MEIA; la de enzimas hepáticas en un multianalizador. De los 158 pacientes estudiados, 84 tenían valores elevados de AST/ALT; dentro de este grupo, el 82% fue reactivo para IgM anti-VHA. Los 74 pacientes restantes mostraron niveles normales de AST/ALT y solo 7 de ellos, bajo control de evolución por VHA ya confirmada, fueron reactivos para IgM anti-VHA. El 49% de los pacientes IgM anti-VHA reactivos correspondió a menores de 10 años. De acuerdo con estas observaciones, sugerimos que los estudios de laboratorio para confirmar infección aguda por VHA deberían realizarse en forma secuencial, ya que es innecesaria la determinación de anticuerpos IgM anti-VHA cuando las aminotransferasas séricas son normales.

Dot Blot para determinar la identidad antigénica en vacunas conjugadas contra Streptococcus pneumoniae serotipo 19F

Directory of Open Access Journals (Sweden)

Osmir Cabrera-Blanco

2017-04-01

Full Text Available Las autoridades regulatorias recomiendan el uso de técnicas de Resonancia Magnética Nuclear o técnicas serológicas para la determinación de la identidad de los antígenos presentes en las vacunas conjugadas. Con la aparición de las vacunas conjugadas multivalentes, se ha hecho necesario recurrir a técnicas inmunoquímicas con la utilización de anticuerpos monoclonales para aumentar la sensibilidad en la determinación de la identidad de los antígenos en dichas vacunas conjugadas. El objetivo del presente trabajo fue establecer las condiciones óptimas de trabajo que permitieran utilizar la técnica del Dot Blot para determinar la identidad de los antígenos en vacunas conjugadas de Streptococcus pneumoniae serotipo 19F. Para ello se estudiaron los tiempos de incubación, la influencia del reactivo en la solución de bloqueo; también las concentraciones óptimas del anticuerpo monoclonal y de los ingredientes farmacéuticos activos, así como los volúmenes de aplicación óptimos para estos y vacunas. Se utilizó un anticuerpo monoclonal contra el polisacárido capsular del serotipo 19F de neumococo. Las muestras empleadas en este trabajo fueron lotes de ingredientes farmacéuticos activos de conjugados de polisacárido capsular 19F y lotes de un candidato vacunal cubano conjugado heptavalente contra neumococos. Los resultados mostraron que para la determinación de la identidad antigénica fueron suficientes 10 µL de muestras de los principios activos a una concentración de 125 µg/mL e igual volumen para las vacunas heptavalentes. Quedó demostrado que una concentración de 1 µg/mL para el anticuerpo monoclonal y tiempos de incubación de 30 min a 37 °C fueron suficientes para la determinación. Estos resultados permiten concluir que quedaron establecidas las condiciones óptimas de trabajo para determinar la identidad antigénica por Dot Blot del polisacárido capsular de S. pneumoniae serotipo 19F presente en las vacunas

Anticuerpos aviares: alternativa en producción y diagnóstico

Directory of Open Access Journals (Sweden)

Carmen E. Alarcón

2000-12-01

Full Text Available El uso de anticuerpos para investigación y diagnóstico se realiza desde hace varias décadas en todo el mundo. Normalmente, estos anticuerpos se obtienen a partir del suero de mamíferos (roedores, caprinos, equinos, etc.. De acuerdo con el tamaño del huésped, se pueden producir pequeñas o grandes cantidades de suero, haciendo siempre sangrías regulares para su recolección. En los últimos anos, se han utilizado cada vez con mayor frecuencia anticuerpos purificados a partir de huevos de gallinas inmunizadas, los cuales presentan diferencias con los anticuerpos producidos en mamiferos en su estructura y caracteristicas fisicoquímicas, pero, además, son una alternativa que disminuye el estrés e injuria al huésped y tiene alta productividad y facilidad para su recolección. Se ha informado el uso de estos anticuerpos aviares en ensayos inmunoquímicos, producción de conjugados y en terapéutica con un éxito similar al de los anticuerpos en mamiferos y a un costo menor. En este trabajo, se hace una revisión del tema y se plantean sus posibles usos tanto en investigación y diagnóstico, como en terapia.

Exposición a Estreptococo del grupo B en mujeres mexicanas en edad reproductiva

Directory of Open Access Journals (Sweden)

Palacios-Saucedo Gerardo

2002-01-01

Full Text Available Objetivo. Evaluar la seroprevalencia de la infección por Estreptococo del grupo B (EGB en una muestra representativa de mujeres en edad reproductiva de la República Mexicana. Material y métodos. Se estudió una muestra representativa de sueros de la población femenina mexicana de 15 a 40 años de edad, de todos los niveles socioeconómicos. La muestra fue seleccionada del Banco Nacional de Sueros por muestreo aleatorio simple por computadora. Los sueros se obtuvieron durante la última encuesta seroepidemiológica nacional realizada en 1987 y 1988. Los ensayos para la estandarización y la evaluación de la seroprevalencia se llevaron a cabo en el Hospital de Pediatría del Centro Médico Nacional Siglo XXI, del Instituto Mexicano del Seguro Social (IMSS entre enero y noviembre de 1995. Se midieron anticuerpos IgG antipolisacárido de grupo de EGB usando un ensayo inmunoenzimático (ELISA estandarizado y validado en el laboratorio, utilizando un antígeno específico de grupo, producido y purificado a partir de la cepa de referencia de EGB 110. Resultados. Se estudió un total de 2 669 muestras de suero, de las cuales 2 405 fueron positivas para la presencia de anticuerpos IgG contra el antígeno de grupo de EGB. Esto corresponde a una seroprevalencia de 90.2 %. No hubo diferencia en los porcentajes de seropositividad por grupos de edad ni por entidades federativas. Conclusiones. Se detectó una elevada prevalencia de anticuerpos contra el antígeno de grupo del EGB. Los resultados de este estudio sugieren que existe una elevada exposición de las mujeres mexicanas jóvenes a este microrganismo.

Seroprevalencia de leishmaniosis visceral canina en la comuna 8 de Neiva y en cuatro municipios de Huila, Colombia

OpenAIRE

José Fernández; Felio Bello; Myriam Consuelo López; Ligia Inés Moncada; Jimmy Jolman Vargas; Martha Stella Ayala; Rubén Santiago Nicholls; Carlos Alberto Lozano

2006-01-01

Introducción. La leishmaniosis visceral canina en áreas endémicas de Colombia se constituye en un factor de riesgo para la salud pública, dado el carácter zoonótico de la enfermedad. Durante el año 2004 se registraron 96 casos de leishmaniosis visceral humana en el país, de los cuales cinco correspondieron al departamento del Huila, zona de influencia del vector Lutzomyia longipalpis. Objetivo. Determinar la prevalencia de anticuerpos IgG contra Leishmania chagasi en sueros de caninos rec...

Anticuerpo anticitrulina y manifestaciones extra articulares en artritis reumatoidea

Directory of Open Access Journals (Sweden)

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.

Ensayo de neutralización in vitro de aplicación en la evaluación de inmunógenos contra la hepatitis A, obtenidos mediante la tecnología de expresión en fagos filamentosos

Directory of Open Access Journals (Sweden)

Alicia Aguilar

2010-04-01

Full Text Available La inmunidad contra el virus de la hepatitis A (VHA se debe en primera instancia a la inducción de anticuerpos neutralizantes. Disponer de ensayos de neutralización es indispensable para evaluar nuevos candidatos vacunales contra este patógeno. En el presente trabajo se desarrolló un ensayo de neutralización in vitro que permitió evaluar la inmunogenicidad de mimotopos del VHA obtenidos mediante la tecnología de expresión en fagos al ser inmunizados ratones Balb/c. Diferentes diluciones de anticuerpos se incubaron con 103 o 102 Dosis Infecciosas en Cultivo de Tejidos 50% (DICT50 del clon citopático HM175/18f de VHA, y se inocularon en placas con células FRhK4. Después de 7 días de incubación el título neutralizante se determinó como el recíproco de la dilución del suero capaz de reducir la multiplicación viral al 50%. Tanto 103 como 102 DICT50 fueron neutralizadas por el anticuerpo monoclonal 7E7 y los sueros humanos (A12 y A31 positivos a anticuerpos anti-VHA. Los controles negativos del ensayo no neutralizaron al virus. Los títulos neutralizantes de los sueros de ratones inmunizados con fagos portadores de mimotopos de VHA oscilaron entre 4 y 16, mientras que los sueros preinmunes y los de ratones inmunizados con fago salvaje M13 no neutralizaron la infectividad viral. Este ensayo de neutralización resultó adecuado para la evaluación de los inmunógenos propuestos

Anticuerpos policlonales contra la proteína recombinante NS3 del virus del dengue

OpenAIRE

Liliana Morales; Myriam L. Velandia; María Angélica Calderon; Jaime E. Castellanos; Jacqueline Chaparro-Olaya

2017-01-01

Introducción. El dengue es una enfermedad causada por uno de los cuatro serotipos del virus del dengue (DENV) y es endémica en, aproximadamente, 130 países. Su incidencia ha aumentado notablemente en las últimas décadas, así como la frecuencia y la magnitud de los brotes. A pesar de los esfuerzos, no existen tratamientos profilácticos ni terapéuticos contra la enfermedad y, en ese contexto, el estudio de los procesos que gobiernan el ciclo de infección del DENV es esencial para desarrollar...

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

Directory of Open Access Journals (Sweden)

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

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

Directory of Open Access Journals (Sweden)

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

Encefalitis aguda mediada por anticuerpos contra el receptor ionotrópico de glutamato activado por N-metil-D-aspartato (NMDAR: análisis de once casos pediátricos en Argentina (Premio Benito Yelín

Directory of Open Access Journals (Sweden)

Elisa Pérez

2013-09-01

Full Text Available Las encefalitis son procesos inflamatorios de diverso origen, entre las cuales se incluyen las autoinmunes. La identificación de anticuerpos contra el receptor N-metil-D-aspartato permitió la caracterización clínico-inmunológica de una entidad susceptible a tratamiento inmunomodulador. Descripta originalmente en mujeres jóvenes, asociada a teratoma de ovario, es hoy una entidad reconocida en niños aun en ausencia de tumores detectables. El objetivo del trabajo, realizado a través de la revisión de historias clínicas, fue describir las características clínicas, evolutivas y los hallazgos en estudios complementarios de once niños con diagnóstico confirmado de esta entidad a través de la identificación de los anticuerpos específicos. Todos debutaron con síntomas psiquiátricos, en nueve de ellos asociando a convulsiones, y dos a movimientos extrapiramidales. En su evolución, todos presentaron compromiso del lenguaje, nueve, síntomas autonómicos graves, en uno con hipoventilación y requerimientos de ARM. La RM de cerebro fue anormal en tres. Ocho tuvieron EEG con asimetría del voltaje y/o amplitud, tres de ellos presentaron espigas. En el LCR seis tuvieron pleocitosis y tres de siete bandas oligoclonales positivas. Cinco, serologías IgM para micoplasma. El aumento de CPK en coincidencia con antipsicóticos ocurrió en cinco. Con el tratamiento inmunomodulador, cinco tuvieron recuperación total, tres, alteraciones conductuales/cognitivas y uno déficits severo. Un paciente resolvió su cuadro clínico sin tratamiento. En ninguno se detectó tumor asociado. Concluimos que frente a un niño con encefalopatía aguda y clínica compatible con esta entidad, una vez descartada causa infecciosa, se debe comenzar tratamiento inmunomodulador precozmente, evitar la utilización de fármacos antipsicóticos y realizar la búsqueda de posibles tumores ocultos.

Vacunación antineumococo en pacientes con lupus eritematoso sistémico

Directory of Open Access Journals (Sweden)

C. Pisoni

2003-10-01

Full Text Available Se evaluó la respuesta de anticuerpos específicos, aparición de autoanticuerpos y actividad de la enfermedad en pacientes con lupus eritematoso sistémico (LES luego de la inmunización con vacuna polivalente para neumococo. Se inoculó, con vacuna 23 valente para neumococo, a 37 pacientes con diagnóstico de LES; previamente y a las 12 semanas post vacunación se determinó los autoanticuerpos, el nivel de complemento sérico y la actividad de la enfermedad aplicando el índice SLEDAI y la respuesta de los anticuerpos IgG contra antígenos polisacáridos capsulares. En 30 pacientes (85.7% los anticuerpos duplicaron el valor basal alcanzando de esta manera, el nivel estimado protector. No hubo diferencias estadísticamente significativas en los índices de actividad post vacunación. En conclusión: en esta serie de pacientes lúpicos, la inmunización con vacuna 23 valente no provocó reactivación de la enfermedad, e indujo una adecuada respuesta de anticuerpos en el 85% del grupo. No se registraron efectos adversos generales o locales que motivaran alguna medicación o internación de ningún paciente.The objective of the study was to evaluate antibody response, autoantibodies induction and disease activity in systemic lupus erythematosus (SLE patients after polyvalent pneumococcal vaccination. SLE patients (n 37 were vaccinated with 23 valent pneumococcal vaccine. Systemic lupus erythematosus disease activity index (SLEDAI and specific IgG antibodies against pneumococcus were measured before and after vaccination. After inoculation 30 patients (85.7% duplicated IgG anti pneumococcus baseline value, reaching protective levels of antibodies. We did not find significant differences in disease activity up to three months after vaccination. In conclusion: after vaccination of this lupus population an 85.0% antibody response was obtained, without temporal associated disease flare or any serious adverse event.

Evaluación de la seroprotección contra sarampión, rubéola y hepatitis B en niños menores de cinco años del Perú, 2011 Evaluation of the seroprotection against measles, rubella and hepatitis B in children under 5 years of age in Peru, 2011

Directory of Open Access Journals (Sweden)

Víctor Fiestas Solórzano

2012-12-01

Full Text Available Objetivos. Estimar la prevalencia de anticuerpos contra sarampión, rubéola y hepatitis B en niños de 1 a 4 años del Perú. Materiales y métodos. Se realizó una encuesta nacional basada en la aplicación de un cuestionario y obtención de muestra de sangre capilar en papel de filtro para el estudio de anticuerpos contra sarampión, rubéola y hepatitis B en niños de 1 a 4 años. Se utilizó un muestreo probabilístico, estratificado y multietápico con inferencia a nivel nacional y siete ámbitos de estudio: Lima metropolitana, resto de costa urbana, costa rural, sierra urbana, sierra rural, selva urbana y selva rural. Las muestras de sangre capilar fueron procesadas siguiendo protocolos estandarizados para la determinación de anticuerpos mediante técnica de ELISA utilizando reactivos comerciales. Resultados. Se encontró una prevalencia nacional de 91,6% (IC95%: 90,6-92,7%, 91,3% (IC 95%: 90,3-92,4% y 95,9% (IC 95%: 95,0-96,8% para anticuerpos contra sarampión, rubéola y hepatitis B respectivamente. No se evidenció diferencias significativas de las prevalencias entre los diferentes ámbitos de estudio y en los diferentes estratos socioeconómicos de los conglomerados. Conclusiones. En niños de 1 a 4 años se ha estimado una prevalencia nacional de anticuerpos contra sarampión y rubéola entre 90-93%, mientras que para anticuerpos contra hepatitis B (anti-HBsAg entre 95-97%.Objectives. To estimate the prevalence of antibodies against measles, rubella and hepatitis B in children aged between 1 and 4 years in Peru. Materials and methods. A national survey was conducted based on a questionnaire and capillary blood sample taken on filter paper in order to study antibodies against measles, rubella and hepatitis B in children from 1 to 4 years of age. A stratified, multistage, probability sampling design was used to be representative at the national level and at level of seven ambits, including the Metropolitan Lima Area, the rest of the

PURIFICACIÓN DE IgY CONTRA LA SUBUNIDAD NR3 DEL RECEPTOR NMDA DE CEREBRO DE RATA

Directory of Open Access Journals (Sweden)

Gina Méndez C

2008-04-01

Full Text Available Objetivo. Obtener anticuerpos tipo IgY contra péptidos sintéticos de las subunidades NR3A y NR3B del receptor NMDA de ratas, para reconocer y seguir la expresión de estas subunidades en extractos de cerebro de rata de diferentes edades. Materiales y métodos. Se diseñaron dos péptidos empleando los sistemas de la base de datos Entrez y el programa ClustalW-PBIL de alineamientos múltiples contra las subunidades NR3A y NR3B del receptor NMDA; una vez sintetizados por el método SSPS-fmoc fueron utilizados para inocular gallinas (Gallus gallus, variedad Hy Line Brown de 16 semanas de edad; al cabo de 57 días postinoculación se purificó IgY específica y se enfrentaron a extractos de cerebro de rata postnatal y adulta. Resultados. Se detectaron las subunidades NR3A y NR3B y se relacionó su expresión con la edad del animal; siendo mayor la expresión de la subunidad NR3A en extracto de cerebro de rata postnatal. No se encontró diferencia marcada en la expresión de la subunidad NR3B en las edades mencionadas. Conclusiones. Esta es la primera investigación que emplea proteína nativa para el reconocimiento de la subunidad NR3 del receptor NMDA, lo cual muestra la especificidad de los anticuerpos generados y contribuye con el entendimiento de las funciones de este receptor y su relación con la regulación de la memoria espacial.

Detección de anticuerpos contra los antígenos de diferenciación tumoral proteinasa 3 (PR3 y mieloperoxidasa (MPO en la leucemia promielocítica Detection of antibodies to antigens of proteinase 3 (PR3 tumor differentiations and myeloperoxidase (MPO in cases of promyelocytic leukemia

Directory of Open Access Journals (Sweden)

Ada A. Arce Hernández

2010-08-01

Full Text Available La leucemia promielocítica (LPM subtipo M3 representa del 5-15 % en la clasificación FAB de las leucemias mieloides agudas (LMA. Está asociada con características genéticas únicas que incluyen la translocación recíproca t(15;17(q22;q12. El mecanismo por el que ocurre la t(15;17 no se conoce. Las leucemias de estirpe mieloide expresan diversos antígenos de diferenciación tumoral como son la proteinasa 3 (PR 3 y la mieloperoxidasa (MPO que se encuentran sobreexpresados en el promielocito. Se plantea que participan en la maduración y en la regulación de la división celular. Existe poca información acerca de la respuesta inmune de pacientes con LPM dirigida contra las células tumorales. En nuestro trabajo se detectó la presencia de anticuerpos contra los antígenos de diferenciación tumoral PR3 y MPO en diferentes fases del tratamiento de la enfermedad, mediante inmunofluorescencia indirecta. Los anticuerpos anti PR3 y anti MPO se detectaron en aquellos pacientes sin tratar y en fase de inducción, no así en la consolidación y mantenimiento, de ahí su posible utilidad como marcadores de diferenciación celular.ABSTRACT Promyelocytic leukemia (PML subtype M3 represents the 5-15 % in the FAB classification of acute myeloid leukemias (AML. It is associated with the unique genetic features including the reciprocal t-translocation (15;17 (q22;q12. The mechanism of t is unknown. The myeloid leukemias express different tumoral differentiation antigens such as the proteinase 3 (PR 3 and myeloperoxidase (MPO which are over-expressed in promyelocyte. It is involved in maturation and regulation of cell division. There is scarce information on the immune response of patients with PLM against tumor cells. In our paper we detected presence of antibodies to RP3 and MPO tumor differentiation antigens in different phases of disease treatment by indirect immunofluorescence. Anti-MPO and anti-PR3 antibodies were detected in those patients without

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

Directory of Open Access Journals (Sweden)

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.

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

Directory of Open Access Journals (Sweden)

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

Obtención, purificación y caracterización de anticuerpos policlonales IgY desarrollados en gallina, dirigidos contra aislamientos colombianos de Giardia duodenalis.

Directory of Open Access Journals (Sweden)

Dabeiba Adriana García

2005-12-01

Full Text Available Introducción. El desarrollo de anticuerpos policlonales requiere de animales de laboratorio, generalmente, el conejo, que deben sangrarse para su obtención. Como alternativa, se han utilizado las gallinas. Objetivo. Desarrollar anticuerpos policlonales IgY anti-Giardia duodenalis y evaluar diferentes métodos para su purificación a partir de yema de huevo. Materiales y métodos. Se inmunizaron tres gallinas intramuscularmente con trofozoítos del parásito: las inmunizaciones se realizaron a los 0, 15, 30, 45, 60, 90 y 120 días. Se recolectaron huevos en cada etapa de la inmunización y se purificó la IgY por deslipidación (D y precipitación (P mediante cinco protocolos diferentes: M1: (P: sulfato de amonio/D: dextrán sulfato-cloruro de calcio, M2: (D: dextrán sulfato-cloruro de calcio/P: sulfato de amonio, M3: (D: cloroformo/ P: sulfato de amonio 50%, M4: (D: solución A/P:solución B y M5: (D: cloroformo/P: sulfato de amonio 30%. Se realizó evaluación inmunoquímica de la IgY anti-Giardia duodenalis mediante inmunodifusión, contrainmunoelectroforesis e inmunoelectrotransferencia (Western blot; la pureza de IgY por SDS-PAGE en presencia y ausencia de reductor y la concentración de la inmunoglobulina (mg/mL por espectrofotometría y densitometría. Resultados. La IgY anti-G. duodenalis mediante evaluación inmunoquímica presentó títulos hasta de 1:32. La inmunoglobulina en ausencia de reductor mostró una banda de 180 kd y en su presencia bandas de 30 y 68 kd, características de sus cadenas liviana y pesada, respectivamente. Las mayores concentraciones de inmunoglobulina se recuperaron con el método dos (M2, 4,6 mg de IgY por mL de yema de partida. Conclusiones. Por su facilidad y economía de producción en gallinas, los anticuerpos policlonales IgY anti-Giardia así obtenidos podrán utilizarse para desarrollar inmunoensayos que detecten el parásito en eluídos de heces.

Prevalencia de anticuerpos IgG al toxoide tetánico en trabajadores sanitarios

Directory of Open Access Journals (Sweden)

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.

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

Directory of Open Access Journals (Sweden)

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

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

Development of IgY antibodies in chickens and IgG in rabbits immunized against proteins of Pythium insidiosum isolated from horses in the state of Rio de Janeiro Desenvolvimento de Anticorpos IgY em galinhas e IgG em coelhos imunizados contra proteínas de Pythium insidiosum isolado de equinos no Estado do Rio de Janeiro, Brasil

Directory of Open Access Journals (Sweden)

Maria Fabíola Nunes Rangel

2010-01-01

Full Text Available Pythiosis is caused by Pythium insidiosum and the occurrence of disease in horses was described in the North and Northwest State of Rio de Janeiro, Brazil. The disease was described in cattle, sheep, humans, and horses in different states and regions across the country. This paper describes the development of IgY and IgG polyclonal antibodies, in chicken and rabbits, respectively against proteins extracted from kunkers and hyphae of P. insidiosum from affected horses. The proteins were recognized by chicken, rabbit and horse antibodies by immunodiffusion and Western blot against majority bands of 27 and 43 KDa, and titrated by ELISA. The antibodies IgY developed by the first time against Brazilian strains of P. insidiosum may represent a valuable tool in the detection of antigens of the pathogen and contribute to further studies aimed at immunotherapy and knowledge about this disease in endemic areas in Rio de Janeiro and in Brazil.Pitiose é causada por Pythium insidiosum e a doença foi descrita em equinos no Norte e Noroeste do Estado do Rio de Janeiro, Brasil. A doença foi descrita em bovinos, ovelhas, humanos e cavalos em diferentes estados e regiões do país. Este trabalho descreve o desenvolvimento de anticorpos policlonais, IgY e IgG, em galinha e coelho, respectivamente, contra proteínas extraídas de kunkers e hifas de P. insidiosum de cavalos doentes. As proteínas foram reconhecidas por anticorpos de galinha, coelho e cavalos contra as bandas majoritárias de 27 e 34 KDa em imunodifusão e Western blot tituladas por ELISA. Os anticorpos IgY desenvolvidos pela primeira vez contra cepas brasileiras de P. insidiosum podem representar um valioso instrumento na detecção de antígenos de patógenos e contribuem para novos estudos baseados na imunoterapia e no entendimento sobre esta doença em áreas endêmicas no Rio de Janeiro e em todo o país.

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

Directory of Open Access Journals (Sweden)

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

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

Directory of Open Access Journals (Sweden)

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.

Síndrome de anticuerpos antifosfolípidos Syndrome of antiphospholipid antibodies

Directory of Open Access Journals (Sweden)

Pedro Omar Pouymiró Pubillones

2012-03-01

Full Text Available El síndrome antifosfolípido es un trastorno multisistémico adquirido y una importante causa de trombosis venosas o arteriales, así como también de morbilidad en el embarazo. Puede ser primario o secundario, este último sobre todo en pacientes con lupus eritematoso sistémico, infecciones y consumo de algunas drogas. Se exponen determinados elementos sobre sus manifestaciones clínicas y los criterios de clasificación actualizados para el diagnóstico. El tratamiento se basa en medidas de profilaxis antitrombóticas y control de los factores de riesgo asociados; pero aún muchos aspectos clínicos y de laboratorio concernientes a esta hipercoagulabilidad por la presencia de anticuerpos contra los fosfolípidos, se hallan sujetos a discusión e investigación.The antiphospholipid syndrome is an acquired multisystemic disorder and an important cause of venous or arterial thrombosis, as well as of morbidity in pregnancy. It can be primary or secondary, the last one mainly in patients with systemic lupus erythematosus, infections and consumption of some drugs. Certain elements on its clinical manifestations and the updated classification criteria for the diagnosis are exposed. The treatment is based on antithrombotic prevention measures and control of the associated risk factors; but many clinical and laboratory aspects concerning this hypercoagulability due to the presence of antibodies against phospholipids, are still under discussion and research.

Perfil de isotipos de imunoglobulinas e subclasses de IgG na leishmaniose tegumentar americana Immunoglobulin isotype and IgG subclass profiles in american tegumentary leishmaniasis

Directory of Open Access Journals (Sweden)

Maria Aparecida de Souza

2005-04-01

Full Text Available O presente trabalho avaliou o perfil de anticorpos em amostras de soro de 37 pacientes com diagnóstico clínico confirmado ou compatível com leishmaniose tegumentar americana atendidos no Hospital de Clínicas da Universidade Federal de Uberlândia, MG. Os perfis das classes de imunoglobulinas e subclasses de IgG foram analisados pelo teste ELISA indireto, utilizando-se antígeno solúvel de Leishmania (Leishmania amazonensis. A avidez dos anticorpos foi determinada pelo tratamento com uréia a 6 M, após incubação dos soros com o antígeno. Observou-se que 97%, 94,6%, 57,5 e 21,5% das amostras testadas apresentaram anticorpos anti-Leishmania das classes IgE, IgG, IgA e IgM, respectivamente e, os perfis das subclasses de IgG demonstraram, IgG1>IgG3>IgG2>IgG4. Os anticorpos IgE anti-Leishmania de alta avidez corresponderam a 44,4%. Por outro lado, IgG e IgA anti-Leishmania foram em sua maioria (62,8 e 47,8%, respectivamente, de média avidez. A variação do perfil de isotipos, bem como a avidez das imunoglobulinas refletiu a complexidade da resposta imune humoral contra a leishmaniose tegumentar americana.The present work investigated the serum antibody profiles in 37 patients with American tegumentary leishmaniasis, who were attended at Hospital de Clinicas - Universidade Federal de Uberlandia, MG, Brazil. The immunoglobulin class and IgG subclass profiles were analyzed by indirect ELISA using Leishmania (Leishmania amazonensis soluble antigen. The antibody avidity was determined by 6 M urea treatment after incubation with immunoenzymatic conjugate. It was observed that 97% of the serum samples presented anti-Leishmania antibodies for IgE class, 94.6% IgG, 57.5% IgA and 21.5% IgM class. For IgG subclasses the profiles were in the following order of frequency: IgG1>IgG3>IgG2>IgG4. High avidity of anti-Leishmania IgE antibodies was found in 44.4% of the samples. On the other hand, moderate avidity of specific IgG and IgA was observed in 62

Detección de anticuerpos contra Trypanosoma cruzi en Somoto, Nicaragua, mediante ELISA indirecto e IFI en muestras de sangre en papel de filtro

Directory of Open Access Journals (Sweden)

Palacios Xiomara

2000-01-01

Full Text Available Se estandarizó un inmunoensayo enzimático en fase sólida (ELISA para estudiar la presencia de anticuerpos contra Trypanosoma cruzi en personas asintomáticas que viven en un área endémica de enfermedad de Chagas en Nicaragua. El ensayo fue estandarizado para el análisis de muestras de sangre colectadas en papel de filtro como método simple de transporte de muestras de sangre. Se realizó un estudio previo en el que se estudiaron por ELISA 18 muestras de suero total y 18 eluidos de sangre de pacientes con enfermedad de Chagas crónica, 30 muestras de suero y 30 eluidos de sangre de personas sanas que se utilizaron como controles negativos y 14 muestras de suero y 14 eluidos de sangre de pacientes con leishmaniasis cutánea o visceral que se utilizaron para los estudios de reacciones cruzadas. Tanto con el suero total como con los eluidos de sangre, la prueba de ELISA proporcionó una sensibilidad de 100% y una especificidad de 90%; solo se observaron reacciones cruzadas con las muestras de pacientes con leishmaniasis visceral. El estudio poblacional incluyó a ocho comunidades rurales de Somoto, Nicaragua. Mediante un muestreo al azar se colectaron muestras de sangre en papel de filtro a 2 434 personas (1 335 del sexo masculino y 1 099 del sexo femenino de las comunidades de Aguas Calientes, La Manzana, Los Canales, Santa Rosa, Las Playas, El Brocal, Santa Isabel y Santa Teresa. Las muestras fueron estudiadas por ELISA e inmunofluorescencia indirecta (IFI encontrándose un total de 260 seropositivos por ELISA (10,7%, 207 de los cuales fueron también positivos por IFI (8,5%. La mayoría de los sueros seropositivos correspondieron a personas del sexo femenino con ambas técnicas, pero la diferencia entre hombres y mujeres no fue estadísticamente significativa. Los resultados obtenidos con ambas técnicas mostraron una excelente concordancia. Con respecto a la edad se observó una curva ascendente, con 5,4% de seropositivos por ELISA en

Seroprevalencia de anticuerpos contra Trypanosoma cruzi y su asociación con factores de riesgo en menores de 18 años de Veracruz, México Seroprevalence of Trypanosoma cruzi antibodies and associated risk factors among the population under 18 years of age in Veracruz, Mexico

Directory of Open Access Journals (Sweden)

Paz María Salazar

2007-08-01

Full Text Available OBJETIVOS: Determinar la prevalencia de anticuerpos contra Trypanosoma cruzi en menores de 18 años del estado de Veracruz, México, e identificar los factores de riesgo asociados con las características de la vivienda y la presencia y distribución del agente transmisor. MÉTODOS: Estudio epidemiológico transversal en la población menor de 18 años que vivía en 10 de las 11 jurisdicciones sanitarias del estado de Veracruz, México, entre 2000 y 2001. La presencia de anticuerpos contra T. cruzi se determinó mediante una prueba de hemaglutinación indirecta (HAI y un ensayo inmunoenzimático indirecto tipo ELISA en muestras de suero tomadas en papel de filtro y se confirmaron mediante las pruebas de HAI, ELISA e inmunofluorescencia indirecta (IFI en muestras de suero. Se aplicó un cuestionario para evaluar las condiciones de la vivienda y se calcularon los índices entomológicos de triatominos intra y peridomiciliarios. Los resultados se evaluaron mediante análisis bifactorial y multifactorial por regresión logística no condicional. RESULTADOS: De las 150 personas inicialmente reactivas, 14 resultaron positivas (5 mediante la prueba de HAI, ELISA e IFI; 6 por HAI y ELISA y 3 por ELISA e IFI, para una prevalencia general de 0,91% (IC95%: 0,85% a 0,94%. Los casos positivos residían en cinco jurisdicciones sanitarias y la mayor prevalencia se encontró en Tuxpan: 5,2% (IC95%: 1,2% a 9,0%. Los factores de riesgo fueron el haber visto chinches dentro de la vivienda y los techos con fisuras. La única especie del agente transmisor capturada fue Triatoma dimidiata. Los índices entomológicos de infestación, colonización e infección natural fueron: 10,9%, 50,0% y 9,0%, respectivamente. CONCLUSIONES: Se confirmó la transmisión vectorial activa de la infección en el estado de Veracruz, México, con una seroprevalencia general de anticuerpos contra T. cruzi en menores de 18 años de 0,91%. Se debe seguir atentamente la seroprevalencia en

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.

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.

Prevalencia de anticuerpos antimaláricos en donantes del banco de sangre del Hospital Universitario San Vicente de Paúl de Medellín, Colombia

Directory of Open Access Journals (Sweden)

Jhon M. Ortíz

1999-12-01

Full Text Available Se determinó la prevalencia de anticuerpos antimaláricos, tipo IgG, mediante la técnica de inmunofluorescencia indirecta (IFI, en 392 sueros de donantes voluntarios de sangre del Hospital Universitario San Vicente de Paúl, recolectados durante los meses de septiembre y octubre del año 1995 y mantenidos en congelación a -70 ""C durante 36 meses. La prevalencia de seropositividad fue de 1,8% (7 donantes, de los cuales, tres tenían el antecedente de haber vivido en zona endémica para malaria; de éstos, dos habían sufrido malaria, por lo menos, una vez en la vida; los cuatro donantes restantes no habían vivido en zona endémica para malaria ni tenían antecedentes de haberla padecido. Todos los donantes tuvieron gotas gruesas negativas para Plasmodium. Para tratar de reducir el riesgo de malaria transfusional, se recomienda informar en forma clara a los donantes sobre lasáreas endémicas para malaria en el departamento, complementar la encuesta que realizan los bancos de sangre con gota gruesa en todas las unidades de sangre que se vayan a transfundir y determinar anticuerpos antimaláricos en todos los donantes de riesgo con encuestas sospechosas y que puedan ser transmisores potenciales de Plasmodium.

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

Directory of Open Access Journals (Sweden)

Ruud M. Buijs

2009-01-01

Full Text Available 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 fueron conjugados a una proteína acarreadora usando glutaraldehido. Los anticuerpos obtenidos fueron usados en estudios de inmunohistoquímica permitiendo la detección de estos transmisores después de un proceso de fijación con glutaraldehido o paraformaldehido para los péptidos.

Thyroid autoantibodies in autoimmune diseases Anticuerpos antitiroideos en enfermedades autoinmunes

Directory of Open Access Journals (Sweden)

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

Anticuerpos monoclonales: desarrollo físico y perspectivas terapéuticas Monoclonal antibodies: physical development and therapeutic perspectives

Directory of Open Access Journals (Sweden)

NINA PATRICIA MACHADO

2006-09-01

Full Text Available Los anticuerpos monoclonales son glucoproteínas especializadas que hacen parte del sistema inmune, producidas por las células B, con la capacidad de reconocer moléculas específicas (antígenos. Los anticuerpos monoclonales son herramientas esenciales en el ámbito clínico y biotecnológico, y han probado ser útiles en el diagnóstico y tratamiento de enfermedades infecciosas, inmunológicas y neoplásicas, así como también en el estudio de las interacciones patógeno-hospedero y la marcación, detección y cuantificación de diversas moléculas. Actualmente, la incorporación de las técnicas de biología molecular e ingeniería genética y proteica han permitido ampliar el horizonte de la generación de anticuerpos monoclonales y sus usos, y se han encontrado técnicas como la hibridación, la quimerización, la humanización y la producción de anticuerpos monoclonales totalmente humanos. Es una de las áreas de mayor crecimiento en la industria biotecnológica y farmacéutica; en el mercado se encuentran cerca de 29 anticuerpos monoclonales aprobados por la Food and Drug Administration (FDA de los Estados Unidos para uso en humanos.

Normalización y validación de ensayos inmunoenzimáticos para cuantificar IgG humana antileptospira serovares canicola canicola, icterohaemorrhagiae copenhageni y pomona mozdok.

Directory of Open Access Journals (Sweden)

Xenia Ferriol

2001-06-01

Full Text Available Con el objetivo de evaluar la respuesta inmune inducida por la vacuna cubana vax-SPIRAL se desarrollaron tres ELISAs de tipo indirecto para la cuantificación de IgG humana antileptospira, en el cual se emplearon como antígenos de captura las células enteras de Leptospira interrogans de los serovares canicola canicola, icterohaemorrhagiae copenhageni y pomona mozdok, inactivadas con formaldehído y posteriormente desecadas a 33 °C durante 16-20 h en placas para ELISA. Para la cuantificación se empleó un suero estándar al que se le asignaron unidades arbitrarias, correspondientes al recíproco del título obtenido por microaglutinación (MAT. Estos fueron 31, 12 y 58 U/mL respectivamente para los tres serovares señalados que se incluyen en el preparado vacunal. Se utilizó un conjugado anti IgG humana-peroxidasa, el cual se une a los anticuerpos específicos contra cada serovar, la reacción se evidencia por la acción de la enzima sobre la mezcla sustratocromógeno (ortofenilendiamina que genera color. El método normalizado se validó para los tres serovares; la precisión intra e interensayos fueron excelentes, con coeficientes de variación inferiores al 10%. Las desviaciones de la recuperación y linealidad fueron también inferiores al 10%. El suero control se ubicaron para los tres serovares en la zona de mayor interés para las muestras. Los ELISAs mostraron un 100% de sensibilidad para los tres serovares y se obtuvieron valores de 93,33% de especificidad para los serovares canicola canicola e icterohaemorrhagiae copenagheni y de 100% para el serovar pomona mozdok. El límite de detección para cada uno de los serovares fue de 0,478; 0,127 y 0,632 U/mL respectivamente.

Factores bióticos y abióticos que determinan la seroprevalencia de anticuerpos contra Trypanosoma Cruzi en el municipio de Palmar de Bravo, Puebla, México Biotic and abiotic determinants of seroprevalence of antibodies against Trypanosoma cruzi in Palmar de Bravo, Puebla, Mexico

Directory of Open Access Journals (Sweden)

Francisca Sosa-Jurado

2004-02-01

Full Text Available OBJETIVO: Determinar la prevalencia de anticuerpos contra Trypanosoma cruzi y su relación con los factores bióticos y abióticos en Palmar de Bravo, Puebla, México. MATERIAL Y MÉTODOS: Estudio transversal efectuado en agosto de 2000 a septiembre de 2001, con una muestra aleatoria simple de 390 voluntarios residentes en Palmar de Bravo, Puebla, México. Se hizo determinación de anticuerpos contra T cruzi con técnicas serológicas validadas, búsqueda del vector y de reservorios domésticos, así como determinación de asociación entre caso positivo y factores de riesgo bióticos y abióticos. El análisis estadístico consistió en índice Kappa para las pruebas diagnósticas, empleando tabla de contingencia de 2 x 2; ji cuadrada corregida de Yates, exacta de Fisher y la razón de posibilidad para estimar la significancia de la asociación de factores bióticos y abióticos. RESULTADOS: La seroprevalencia fue de 4% en la población humana estudiada y de los reservorios (equinos, porcinos y caninos, sólo 10% de los caninos resultaron reactivos. Los vectores identificados fueron T barberi y T pallidipennis, con índice de dispersión e índice de colonización de 55 y 40%, respectivamente. Los factores de riesgo más importantes fueron la altitud (>2 150 y OBJECTIVE: To establish the relationship between seroprevalence for antibodies against Trypanosoma cruzi and its relationship with biotic and abiotic factors. MATERIAL AND METHODS: A cross-sectional study was conducted between August 2000 and September 2001. The study population consisted of a simple random sample of 390 volunteers residing in Palmar de Bravo, Puebla, Mexico. Sample and data collection procedures included assaying antibodies against T cruzi with validated assays, and searching for domestic reservoirs and triatomine bugs. The relationship between biotic and abiotic factors with seropositivity was assessed. Statistical analysis was conducted using Kappa values for

Exposición a Estreptococo del grupo B en mujeres mexicanas en edad reproductiva Serologic evidence of high exposure to Group B streptococci (Streptococcus agalactiae in Mexican women of reproductive age

Directory of Open Access Journals (Sweden)

Gerardo Palacios-Saucedo

2002-01-01

Full Text Available Objetivo. Evaluar la seroprevalencia de la infección por Estreptococo del grupo B (EGB en una muestra representativa de mujeres en edad reproductiva de la República Mexicana. Material y métodos. Se estudió una muestra representativa de sueros de la población femenina mexicana de 15 a 40 años de edad, de todos los niveles socioeconómicos. La muestra fue seleccionada del Banco Nacional de Sueros por muestreo aleatorio simple por computadora. Los sueros se obtuvieron durante la última encuesta seroepidemiológica nacional realizada en 1987 y 1988. Los ensayos para la estandarización y la evaluación de la seroprevalencia se llevaron a cabo en el Hospital de Pediatría del Centro Médico Nacional Siglo XXI, del Instituto Mexicano del Seguro Social (IMSS entre enero y noviembre de 1995. Se midieron anticuerpos IgG antipolisacárido de grupo de EGB usando un ensayo inmunoenzimático (ELISA estandarizado y validado en el laboratorio, utilizando un antígeno específico de grupo, producido y purificado a partir de la cepa de referencia de EGB 110. Resultados. Se estudió un total de 2 669 muestras de suero, de las cuales 2 405 fueron positivas para la presencia de anticuerpos IgG contra el antígeno de grupo de EGB. Esto corresponde a una seroprevalencia de 90.2 %. No hubo diferencia en los porcentajes de seropositividad por grupos de edad ni por entidades federativas. Conclusiones. Se detectó una elevada prevalencia de anticuerpos contra el antígeno de grupo del EGB. Los resultados de este estudio sugieren que existe una elevada exposición de las mujeres mexicanas jóvenes a este microrganismo.Objective. To assess the prevalence of IgG antibodies against Group B streptococci (GBS among women of reproductive age in Mexico. Material and Methods. Serum specimens were drawn from 15 to 40 year-old women, representative of all regions and socioeconomic levels of the country. The sample was randomly selected from Banco Nacional de Sueros (National

Frecuencia de anticuerpos contra el virus C de la hepatitis en pacientes con cirrosis hepática en Yucatán, México Frequency of antibodies against the hepatitis C virus in patients with hepatic cirrhosis in Yucatan, Mexico

Directory of Open Access Journals (Sweden)

Renán A Góngora-Biachi

2003-10-01

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 (pOBJECTIVE: To report the prevalence of antibodies against the hepatitis C virus (anti-HCV in a group of patients with hepatic cirrhosis (HC. MATERIAL AND METHODS: A prospective transversal and descriptive study was carried out from March 1998 to May 1999. Study subjects were 153 patients; 117 (76% male and 36 (24% female, diagnosed with HC. They were attended at the General Hospital Agustín O' Horan and at Regional Research Center Doctor Hideyo Noguchi, in Merida, Yucatan, Mexico. A clinical-epidemiologic questionnaire completed by interview was used for data collection. Anti-HCV were detected

Serum IgG2 and tissue IgG2 plasma cell elevation in orbital IgG4-related disease (IgG4-RD): Potential use in IgG4-RD assessment.

Science.gov (United States)

Chan, Anita S Y; Mudhar, Hardeep; Shen, Sunny Yu; Lang, Stephanie S; Fernando, Malee; Hilmy, Maryam Hazly; Guppy, Naomi Jayne; Rennie, Ian; Dunkley, Lisa; Al Jajeh, Issam

2017-11-01

To determine the role of serum and tissue IgG2 in orbital biopsies with the histological features of IgG4-related disease (IgG4-RD) in comparison with non-IgG4-related orbital inflammatory disorders (OID), including autoimmune disorders. This is an international (Sheffield, UK, and Singapore) collaborative, retrospective case review of 69 patients (38 from Singapore National Eye Centre and 31 from Royal Hallamshire Hospital, Sheffield) with orbital inflammatory biopsies between 2002 and 2016. Clinical information and histology were reviewed and cases were classified into three groups: Group 1: IgG4-RD orbital inflammation (n=43); Group 2: idiopathic OID (n=12) and Group 3: autoimmune OID (n=14). Serum IgG1, IgG2, IgG3 and IgG4 levels were collated where available and immunohistochemistry (IHC) for tissue IgG2 plasma cells was performed. Dual IHC showed IgG2 plasma cells as a distinct population from IgG4 plasma cells. Significant (twofold) serum IgG2 elevation was noted among IgG4-RD (group 1), idiopathic (group 2) and autoimmune OID (group 3). Similarly, significant elevation of tissue IgG2 plasma cells was also seen among IgG4-RD (group 1), idiopathic and autoimmune OID (groups 2 and 3). Significant elevations of serum IgG2 and tissue IgG2 plasma cells are present in orbital IgG4-RD in comparison with non-IgG4 orbital inflammation (idiopathic and autoimmune OID), suggesting that IgG2 may play a role in IgG4-RD. A serum IgG2 cut-off >5.3 g/L was found to be 80% sensitive and 91.7% specific for orbital IgG4-RD, with an accuracy of 0.90. Tissue IgG2 and IgG4 subclass reporting may provide additional insight regarding the 'IgG4-RD' pathogenesis. © Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2017. All rights reserved. No commercial use is permitted unless otherwise expressly granted.

Canakinumab: un anticuerpo monoclonal prometedor en el tratamiento de enfermedades cardiovasculares

Directory of Open Access Journals (Sweden)

Fernando Manzur, MD., FACC

2013-01-01

Full Text Available El canakinumab es un anticuerpo monoclonal anti-IL-1β totalmente humano desarrollado por Novartis, cuyo mecanismo de acción se basa en la neutralización de la señalización IL-1β, lo cual conduce a la supresión de la inflamación en pacientes con trastornos de origen autoinmune. La IL-1β actúa como un mediador de la respuesta inmune periférica durante la infección y la inflamación. Mediante la unión antígeno-anticuerpo el canakinumab inhibe la acción de la IL1-β evitando sus efectos pro-inflamatorios. En la actualidad, está en evaluación como un nuevo posible agente dirigido frente a la IL-1β, con el objetivo de reducir la tasa de eventos cardiovasculares y la diabetes de aparición reciente (estudio CANTOS.

Sistema inmune y genética: un abordaje diferente a la diversidad de anticuerpos.

OpenAIRE

Matta Camacho, Nubia Estela

2011-01-01

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 organi...

Auraalne Contra / Hasso Krull

Index Scriptorium Estoniae

Krull, Hasso, 1964-

2001-01-01

Bibliogr. joonealustes märkustes. Rets. rmt. : Contra [Konnula, Margus]. Suusamütsi tutt : luulet aastatest 1974-2000. Urvaste ; Tartu : Mina Ise, 2001; Contra [Konnula, Margus]. Contra on õhk : [helikassett]. Urvaste :¡ Mina Ise, 2000

Prevalence of antibodies against measles, mumps, and rubella before and after vaccination of school-age children with three different triple combined viral vaccines, Rio Grande do Sul, Brazil, 1996 Prevalencia de anticuerpos contra sarampión, paperas y rubéola en niños en edad escolar antes y después de la vacunación con tres vacunas triples antivirales combinadas diferentes, Rio Grande do Sul, Brasil, 1996

Directory of Open Access Journals (Sweden)

Boaventura Antônio dos Santos

2006-11-01

vacunación a niños de dos escuelas municipales de Rio Grande do Sul, Brasil, durante 1996. Se investigó la seropositividad de anticuerpos de la clase IgG mediante un ensayo de inmunoadsorción enzimática tipo ELISA (sarampión y paperas con Enzygnost [Behring, Marburgo, Alemania] y rubéola con Rubenostika [Organon Teknica, Boxtel, Países Bajos]. Las vacunas comparadas fueron: a E-Zagreb, L-Zagreb y Wistar RA 27/3 (Tresivac; b Moraten, J-Lynn y Wistar RA 27/3 (M-M-R II; y c Schwarz, Urabe AM-9 y Wistar RA 27/3 (Trimovax. RESULTADOS: Antes de la vacunación, 79,2% (intervalo de confianza [IC] 95%: 76,0 a 82,2 de las muestras fueron positivas para sarampión, 69,4% (IC 95%: 65,8 a 72,8 para paperas y 55,4% (IC 95%: 51,6 a 59,2 para rubéola. Después de la vacunación con las vacunas A, B y C, la seropositividad fue de 100%, 99,5% y 100%, respectivamente para sarampión; de 99,5%, 94,5% y 92,0% para paperas; y de 92,6%, 92,3% y 88,6% para rubéola. CONCLUSIONES: Alrededor de un quinto (20,8% de los escolares que pudieron haber sido vacunados contra el sarampión a los 9 meses de edad tenían niveles de anticuerpos insuficientes para protegerlos. En la muestra de escolares sin vacunación previa contra paperas y rubéola se encontró una alta proporción de niños susceptibles. Todas las vacunas fueron inmunogénicas, pero la vacuna A produjo una tasa de seroconversión de 99,5% para el componente de paperas, significativamente mayor que la de las otras dos vacunas (P < 0,01.

Prevalence of antibodies against Kilham virus in experimental rat colonies of Argentina Prevalencia de anticuerpos contra el virus Kilham en colonias experimentales de ratas de Argentina

Directory of Open Access Journals (Sweden)

M. P. Cagliada

2010-02-01

este agente, particularmente en la producción de animales de laboratorio. En este estudio se analizó la prevalencia de anticuerpos contra el virus Kilham en ratas adultas provenientes de bioterios convencionales de Argentina utilizando la prueba de inhibición de la hemoaglutinación. La seroprevalencia varió entre 27,8% y 75%. Este resultado confirma que el virus está circulando en los bioterios convencionales de Argentina, por lo que podría estar interfiriendo con las investigaciones. La infección por este virus debe ser prevenida aplicando sistemas de vigilancia y control, y manteniendo a los animales con sistemas de barrera.

Pathogenicity of IgG in patients with IgG4-related disease.

Science.gov (United States)

Shiokawa, Masahiro; Kodama, Yuzo; Kuriyama, Katsutoshi; Yoshimura, Kenichi; Tomono, Teruko; Morita, Toshihiro; Kakiuchi, Nobuyuki; Matsumori, Tomoaki; Mima, Atsushi; Nishikawa, Yoshihiro; Ueda, Tatsuki; Tsuda, Motoyuki; Yamauchi, Yuki; Minami, Ryuki; Sakuma, Yojiro; Ota, Yuji; Maruno, Takahisa; Kurita, Akira; Sawai, Yugo; Tsuji, Yoshihisa; Uza, Norimitsu; Matsumura, Kazuyoshi; Watanabe, Tomohiro; Notohara, Kenji; Tsuruyama, Tatsuaki; Seno, Hiroshi; Chiba, Tsutomu

2016-08-01

IgG4-related disease (IgG4-RD) is a systemic disease characterised by elevated serum IgG4 and IgG4-positive lymphoplasmacytic infiltration in the affected tissues. The pathogenic role of IgGs, including IgG4, in patients with IgG4-RD, however, is unknown. We examined the pathogenic activity of circulating IgGs in patients with IgG4-RD by injecting their IgGs into neonatal male Balb/c mice. Binding of patient IgGs to pancreatic tissue was also analysed in an ex vivo mouse organ culture model and in tissue samples from patients with autoimmune pancreatitis (AIP). Subcutaneous injection of patient IgG, but not control IgG, resulted in pancreatic and salivary gland injuries. Pancreatic injury was also induced by injecting patient IgG1 or IgG4, with more destructive changes induced by IgG1 than by IgG4. The potent pathogenic activity of patient IgG1 was significantly inhibited by simultaneous injection of patient IgG4. Binding of patient IgG, especially IgG1 and IgG4, to pancreatic tissue was confirmed in both the mouse model and AIP tissue samples. IgG1 and IgG4 from patients with IgG4-RD have pathogenic activities through binding affected tissues in neonatal mice. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

Anuncio de servicio público sobre la tosferina (:30) (Whooping Cough Public Service Announcement)

Centers for Disease Control (CDC) Podcasts

Este anuncio de servicio público, de 30 segundos, alienta a las mujeres embarazadas a ponerse la vacuna contra la tosferina llamada Tdap, durante el tercer trimestre de cada embarazo, para que le pasen anticuerpos a su bebé a fin de que este nazca con protección contra esta grave enfermedad.

Histopathology of IgG4-Related Autoimmune Hepatitis and IgG4-Related Hepatopathy in IgG4-Related Disease.

Science.gov (United States)

Nakanuma, Yasuni; Ishizu, Yoji; Zen, Yoh; Harada, Kenichi; Umemura, Takeji

2016-08-01

Immunoglobulin G4-related disease (IgG4-RD) is a systemic disease involving many organs; it includes IgG4-related sclerosing cholangitis and inflammatory pseudotumor in the hepatobiliary system. Two types of hepatic parenchymal involvement have been reported in IgG4-RD: IgG4-related autoimmune hepatitis (AIH) and IgG4-hepatopathy. Moreover, only three cases of IgG4-related AIH have been reported. Immunoglobulin G4-related AIH is clinicopathologically similar to AIH, except for an elevated serum IgG4 level and heavy infiltration of IgG4-positive plasma cells in the liver tissue. Interestingly, IgG4-related AIH can be complicated by well-known IgG4-RD(s). Immunoglobulin G4-hepatopathy, which includes various histopathological lesions encountered in the liver of patients with type I autoimmune pancreatitis, is classified into five histological categories: portal inflammation, large bile duct damage, portal sclerosis, lobular hepatitis, and cholestasis. Immunoglobulin G4-hepatopathy is currently a collective term covering hepatic lesions primarily or secondarily related to IgG4-related sclerosing cholangitis and type 1 autoimmune pancreatitis. In conclusion, the liver is not immune to IgG4-RD, and at least two types of hepatic involvement in IgG4-RD have been reported: IgG4-related AIH and IgG4-hepatopathy. Additional studies are required to clarify their precise clinical significance with respect to IgG4-RD and inherent liver diseases. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Seroprevalencia de leishmaniosis visceral canina en la comuna 8 de Neiva y en cuatro municipios de Huila, Colombia

Directory of Open Access Journals (Sweden)

José Fernández

2006-10-01

Full Text Available Introducción. La leishmaniosis visceral canina en áreas endémicas de Colombia se constituye en un factor de riesgo para la salud pública, dado el carácter zoonótico de la enfermedad. Durante el año 2004 se registraron 96 casos de leishmaniosis visceral humana en el país, de los cuales cinco correspondieron al departamento del Huila, zona de influencia del vector Lutzomyia longipalpis. Objetivo. Determinar la prevalencia de anticuerpos IgG contra Leishmania chagasi en sueros de caninos recolectados en los municipios de Rivera, Palermo, Villavieja, Algeciras y la comuna 8 de la ciudad de Neiva, Huila, Colombia. Materiales y métodos. Se realizó una encuesta epidemiológica a los propietarios de 610 caninos y previo consentimiento se llevó a cabo examen clínico general y recolección de muestra de sangre de cada una de las mascotas. Los sueros fueron analizados mediante el test de ELISA empleando como antígeno promastigotes de Leishmania chagasi, de la cepa MHOM/CO/84/CL044B. El análisis de datos empleó estadística descriptiva. Resultados. En la población canina 85% fueron mestizos, la edad promedio fue 2,5 años y 67,3% de los animales fueron machos. Al examen clínico las manifestaciones más frecuentes fueron: onicogrifosis 24,3%, linfadenitis 10% y lesiones cutáneas 5%. La frecuencia de anticuerpos IgG contra Leishmania chagasi en la comuna 8 de la ciudad de Neiva fue 28,1%, en Villavieja 28%, en Rivera 14,9%, en Palermo 10% y en Algeciras 5,1%. Adicionalmente, se observó un promedio de cinco personas convivientes por canino seropositivo. Conclusiones. Estos datos demuestran la exposición de los caninos que habitan los ambientes rurales y urbanos de las zonas en estudio a Leishmania chagasi y deben tenerse en cuenta para el fortalecimiento de los programas de control y prevención de esta zoonosis en el Sistema General de Seguridad Social en Salud.

Serum total IgG and IgG4 levels in thyroid eye disease

Directory of Open Access Journals (Sweden)

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

ESTUDIO SEROLÓGICO SOBRE NEOSPOROSIS EN BOVINOS CON PROBLEMAS REPRODUCTIVOS EN MONTERÍA, CÓRDOBA, COLOMBIA

OpenAIRE

Teresa Oviedo S; Cesar Betancur H; Alberto Mestra P; Marco González T; Lázaro Reza G; Karina Calonge G

2007-01-01

Objetivo. Determinar la presencia de anticuerpos contra N. caninum en vacas con desordenes reproductivos. Materiales y métodos. Se utilizaron muestras de suero de 196 vacas procedentes de 27 fincas del municipio de Montería, Colombia. La prueba utilizada para la determinación de anticuerpos fue ELISA. Los criterios de inclusión para las vacas fueron: antecedentes de aborto, momificaciones, reabsorciones embrionarias y repetición de servicios. Resultados. El estudio determinó una seropositivid...

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.

Inmunogenicidad y tolerancia de una vacuna contra influenza, en una población mexicana mayor de 55 años de edad Immunogenicity and safety of the influenza vaccine, in a population older than 55-years in Mexico

Directory of Open Access Journals (Sweden)

Octavio Ayala-Montiel

2005-04-01

Full Text Available OBJETIVO: Verificar la inmunogenicidad y tolerancia de una vacuna purificada, inactivada y fraccionada contra influenza, en adultos mexicanos derechohabientes de Petróleos Mexicanos (Pemex. MATERIAL Y MÉTODOS: Se incluyeron 90 adultos mayores de 55 años de edad, derechohabientes de los servicios médicos del Hospital Central Sur Pemex, durante los meses de noviembre y diciembre de 2000. Los criterios evaluados en relación con la inmunogenicidad incluyeron el porcentaje de sujetos protegidos, cuantificados por medio de anticuerpos antihemaglutininas superior o igual a 1:40, así como por el porcentaje de seroconversión determinado por el título inicial de anticuerpos multiplicado por un factor 4X. Los criterios secundarios fueron la frecuencia de reacciones adversas tanto locales como sistémicas. Se realizaron estudios de afinidad antígeno-anticuerpo para determinar la respuesta policlonal de anticuerpos y de anticuerpos de alta afinidad prevacunación y posvacunación. Se calcularon frecuencias y porcentajes. RESULTADOS: Se identificó una seroprotección en 95.6% de los sujetos a la cepa H1N1, de 98.9% a la cepa H3N2 y de 100% a la cepa B/ Yamanashi. En cuanto a los porcentajes de seroconversión, se identificó un incremento 4X de 74.4 para la cepa H1N1, de 88.9 para la cepa H3N2, y de 82.2 para la cepa B / Yamanashi. Un total de 18 individuos (20% presentaron reacciones locales, mientras que 17 (18.8% presentaron reacciones sistémicas a los cinco días posvacunación y nueve sujetos (10% a los 28 días. Las reacciones locales a los cinco días consistieron en dolor, en 10 individuos (11.1%; enrojecimiento, en ocho (8.8%, e induración, en seis (6.6%. Malestar general, cefalea y fiebre se presentaron a los cinco días en 10, 8.8, y 0% de individuos, respectivamente, y en 4.4, 6.6, y 0%, respectivamente, a los 28 días. CONCLUSIONES: Esta vacuna contra influenza demostró ser altamente inmunogénica en adultos mexicanos mayores de 55 a

Prevalencia de Leptospirosis y factores de riesgo en personas con antecedentes de fiebre en la Provincia de Manu, Madre de Dios, Perú

Directory of Open Access Journals (Sweden)

Manuel Céspedes Z

2003-10-01

Full Text Available Objetivos: Determinar la prevalencia de leptospirosis y los factores de riesgo en personas con antecedentes de fiebre en localidades dedicadas a actividades mineras (lavaderos de oro y la prevalencia de infección en perros en la provincia de Manu, departamento de Madre de Dios, Perú. Material y métodos: Estudio transversal analítico. Se tomaron 71 muestras de sangre de personas con antecedentes de fiebre, provenientes de cinco localidades dedicados a la actividad minera, en ellos se evaluaron la presencia de anticuerpos IgM e IgG contra leptospiras en suero por el método de ELISA y la prueba de microaglutinación (MAT. Los factores asociados a la infección por leptospiras fue evaluada a partir de una encuesta. Además se tomaron muestras de sangre a 27 perros que evaluados por el método de MAT Resultados: Se enrolaron 71 personas de las cuales 47 (66,2% fueron mujeres y 24 (33,8 % varones, 26 (36,6% pobladores presentaron anticuerpos contra leptospiras. Los factores asociados a la infección por leptospiras en los pobladores fueron: consumo de agua de río en el hogar (OR=9,09 p=0,017, consumo de agua de río en el campo (OR=7,13 p=0,042, nadar en el río (OR=4,60 p=0,13, habitar en una vivienda con techo de plástico y paja (OR=4,04 p=0,013. En canes, 18 (66,6% tuvieron serología positiva a leptospiras. Conclusiones: Existe una alta prevalencia de leptospirosis en personas con antecedentes de fiebre y condiciones favorables para la presencia de leptospiras en las localidades estudiadas. En estas zonas se recomienda realizar actividades educativas preventivas, tomando en cuenta los factores de riesgo identificados.

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

Directory of Open Access Journals (Sweden)

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.

Cubeta para la incubación y lavado de anticuerpos

OpenAIRE

Revilla Novella, Yolanda; Nogal París, María Luisa

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. Esta cubeta ti...

Human IgG4 binds to IgG4 and conformationally altered IgG1 via Fc-Fc interactions

NARCIS (Netherlands)

Rispens, Theo; Ooievaar-de Heer, Pleuni; Vermeulen, Ellen; Schuurman, Janine; van der Neut Kolfschoten, Marijn; Aalberse, Rob C.

2009-01-01

The Fc fragment of IgG4 can interact with the Fc fragment of another IgG molecule. This interaction is a confounding factor when measuring IgG4 rheumatoid factor levels. Recently, we demonstrated that half-molecules of IgG4 can exchange to form a bispecific Ab. We expected these two phenomena to be

Some properties of contra-γ-continuous functions

International Nuclear Information System (INIS)

Nasef, Arafa A.

2005-01-01

The notion of contra-continuity was introduced and investigated by Dontchev [Int. J. Math. Math. Sci. 19 (1996) 303]. In this paper, we apply the notion of γ-open sets in topological spaces to present and study a new class of functions called contra-γ-continuous functions which lies between classes of contra-semi-continuous functions and contra-β-continuous functions. We speculate that contra-γ-continuity may be relevant to the physics of fractal and cantorian spacetime

Caracterización de la transmisión de Plasmodium malariae en cuatro regiones colombianas endémicas de malaria

Directory of Open Access Journals (Sweden)

Juan Vergara

2001-03-01

Full Text Available En Colombia, la detección del número de casos de infección por Plasmodium malariae muestra una distribución porcentual focalizada en la Costa Pacifica, donde alcanza un 95% en contraste con el 5% de casos más esporádicos que se presentan en otras regiones. El departamento del Valle del Cauca aporta el 85% y el 15% restante corresponde a los departamentos de Chocó y Cauca. La región de Zacarias aporta el 70% seguida por las regiones de Citronela, Puerto Merizalde, Anchicayá, Meseta y Boca Dagua, regiones que conjuntamente contribuyen con el 30%. En un estudio transversal, realizado en 1997 mediante gota gruesa en la población de Zacarías, se encontró una frecuencia de 9,1% de casos de P malariae. Se usaron muestras de donantes infectados con gametocitos de P malariae para alimentar mosquitos Anopheles albimanus y reproducir exitosamente el ciclo ex vivo. Se analizaron 242 plasmas obtenidos de individuos de Zacarias y Punta Soldado (Valle y Pizarro (Chocó para determinar la presencia de anticuerpos especificos para P malariae. Se encontró que el 9,1% contenía anticuerpos identificables por la técnica de Elisa contra una preparación cruda de antígeno y que el 42,1% presentaba anticuerpos contra el péptido sintético (NAAG, derivado de la proteína circumesporozoíto (CS. En 50 muestras analizadas de la región del Bajo Guaviare, se encontró presencia de anticuerpos contra (NAAG, en el 16%. Los resultados de este estudio muestran una gran delimitación de los casos de la Costa Pacífica, al área de Zacarias, indicando también la posible presencia de este parásito en otras regiones del paÍs.

HIV/AIDS

Science.gov (United States)

... diagnosticar mediante análisis rápidos que permiten detectar la presencia o ausencia de anticuerpos contra el virus. En ... transgender people. Key populations often have legal and social issues related to their behaviours that increase vulnerability ...

IgG4 Cholangiopathy

Directory of Open Access Journals (Sweden)

Yoh Zen

2012-01-01

Full Text Available IgG4 cholangiopathy can involve any level of the biliary tree which exhibits sclerosing cholangitis or pseudotumorous hilar lesions. Most cases are associated with autoimmune pancreatitis, an important diagnostic clue. Without autoimmune pancreatitis, however, the diagnosis of IgG4-cholangiopathy is challenging. Indeed such cases have been treated surgically. IgG4-cholangiopathy should be diagnosed based on serological examinations including serum IgG4 concentrations, radiological features, and histological evidence of IgG4+ plasma cell infiltration. Steroid therapy is very effective even at disease relapse. A Th2-dominant immune response or the activation of regulatory T cells seems to be involved in the underlying immune reaction. It is still unknown why IgG4 levels are specifically elevated in patients with this disease. IgG4 might be secondarily overexpressed by Th2 or regulatory cytokines given the lack of evidence that IgG4 is an autoantibody.

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

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.

ENFERMEDAD DE NEWCASTLE EN AVES DE TRASPATIO DEL EJE CAFETERO COLOMBIANO

Directory of Open Access Journals (Sweden)

Marlyn Romero P

2009-08-01

Full Text Available Objetivo. Evaluar la circulación del virus de la enfermedad de Newcastle (ENC en aves de traspatio de siete municipios del eje cafetero por medio de la técnica ELISA. Materiales y métodos. Fueron encuestados 465 predios para evaluar las normas de bioseguridad de las aves de traspatio de los municipios de Armenia, Circasia, Quimbaya, Montenegro, Filandia, Calarcá y La Tebaida del Departamento del Quindío. Se analizaron 662 muestras de suero para detectar anticuerpos IgG contra el virus de la ENC por ELISA. Resultados. La seroprevalencia de la ENC en la población de aves evaluada fue del 30.7%.(203/662, que corresponde al 38.5% de los predios encuestados. No se encontró asociación entre la especie y la seroreactividad (p=0.21, ni entre la distribución de los anticuerpos por grupos productivos y la edad (p>0.05. Los predios de traspatio son manejados de forma extensiva, albergan en las mismas instalaciones aves de diferentes especies y edades en el 64.3% (299/465, con edades en intervalos entre tres meses y cinco años. Fueron detectadas malas prácticas de manejo de la gallinaza y la mortalidad, sin encontrar asociación estadísticamente significativa entre las variables evaluadas y la presencia de anticuerpos anti-virus de ENC (p>0.05. Conclusiones. Es necesario el establecimiento de planes adecuados de vacunación de las aves de traspatio, la vigilancia epidemiológica activa, la observación de los casos sospechosos, sin dejar de lado la educación y capacitación, sobre el adecuado manejo de los animales, dirigida a los propietarios de las aves como medidas de control de la enfermedad.

Validación de un ELISA para la cuantificación de las impurezas proteicas de la cepa hospedera en el principio activo de la vacuna recombinante cubana contra la hepatitis B

Directory of Open Access Journals (Sweden)

Eliana Pérez

2014-04-01

Full Text Available Se validó un inmunoensayo tipo sandwich de doble anticuerpo para cuantificar las impurezas proteicas de la cepa hospedera que pueden estar presentes en el principio activo de la vacuna cubana contra la hepatitis B. Se prepararon los reactivos biológicos empleados en el ELISA. Las proteínas de la cepa hospedera se obtuvieron bajo las mismas condiciones que el proceso de producción de la proteína recombinante hasta un paso de semipurificación o purificación primaria. Los antisueros dirigidos contra las proteínas de la cepa hospedera se generaron en conejos por un proceso de inmunización en cascada. Para la validación se analizaron los siguientes parámetros: linealidad, límite de detección y cuantificación, exactitud, rango y precisión. El ensayo establecido resultó específico, con una exactitud entre 89% y 109% para todos los tampones estudiados; se demostró un ajuste parabólico y un rango de trabajo entre 0,63 y 1,25 ng/mL, la repetibilidad y la precisión intermedia mostraron coeficientes de variación inferiores al 10 y 20% respectivamente.

ESTUDIO SEROLÓGICO SOBRE NEOSPOROSIS EN BOVINOS CON PROBLEMAS REPRODUCTIVOS EN MONTERÍA, CÓRDOBA, COLOMBIA

Directory of Open Access Journals (Sweden)

Teresa Oviedo S

2007-08-01

Full Text Available Objetivo. Determinar la presencia de anticuerpos contra N. caninum en vacas condesordenes reproductivos. Materiales y métodos. Se utilizaron muestras de suerode 196 vacas procedentes de 27 fincas del municipio de Montería, Colombia. Laprueba utilizada para la determinación de anticuerpos fue ELISA. Los criterios deinclusión para las vacas fueron: antecedentes de aborto, momificaciones,reabsorciones embrionarias y repetición de servicios. Resultados. El estudio determinóuna seropositividad contra N. caninum del 10,2%. De los animales muestreados, el10,76% presentaron abortos, 9,75% fueron vacas repetidoras de celo, 20.0%presentaron momificación fetal y 0.0% con reabsorciones embrionarias.Conclusiones. Con base en los resultados se puede afirmar que existe evidencia decirculación antigénica de N. caninum en hembras bovinas del municipio de Montería,Colombia.

Observaciones sobre el plan de vacunación contra el distemper en visones (Mustela vison en un criadero de Argentina Evaluation of the immune response after vaccination against distemper at a mink (Mustela vison farm in Argentina

Directory of Open Access Journals (Sweden)

A. M. Jar

2010-09-01

Full Text Available El virus del distemper produce una enfermedad en los visones que cursa con síntomas respiratorios, gastrointestinales, neurológicos y cutáneos y presenta alta morbilidad y mortalidad, principalmente en los cachorros. La enfermedad se controla mediante la aplicación de vacunas destinadas a esta especie. El objetivo del trabajo fue determinar el título de anticuerpos neutralizantes contra el virus del distemper en visones vacunados y no vacunados de un criadero de Argentina. Se analizó la cinética de anticuerpos obtenidos posvacunación en 27 animales adultos y de anticuerpos calostrales en 10 cachorros. Todos los visones adultos vacunados mostraron títulos protectores hasta por lo menos 3 meses después de la vacunación. El 37,5% redujo significativamente sus niveles de anticuerpos a los 12 meses de la vacunación. En los cachorros, sólo un 20% mostró niveles protectores de anticuerpos calostrales a las 7 semanas de edad, que se negativizaron hacia las 11 semanas. La vacunación a las 13 semanas de edad produjo títulos protectores en todos estos animales. Estos resultados muestran que la vacunación induce respuesta humoral satisfactoria en el medio estudiado e indican la conveniencia de revacunar a las madres anualmente antes del servicio. Se discute el plan de vacunación en cachorros.Distemper virus causes a disease affecting minks with respiratory, gastrointestinal, neurological and skin symptoms and showing high morbidity and mortality, mainly among puppies. It is controlled through immunization, using vaccines that are supplied for mink use. The aim of this work was to determine the seroneutralization titer against the distemper virus at a mink farm in Argentina. The antibody kinetics obtained after vaccination in 27 adult animals, as well as the duration of colostrum-transferred antibodies in 10 puppies were determined. All vaccinated adult minks showed protective titers up to at least 3 months after vaccination, and 37

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.

Almost contra-g-continuous functions

Energy Technology Data Exchange (ETDEWEB)

Keskin, Aynur [Department of Mathematics, Faculty of Science and Arts, Selcuk University Campus, 42075 Konya (Turkey); 2949-1 Shiokita-cho, Hinagu, Yatsushiro-shi, Kumamoto-ken 869-5142 (Japan)], E-mail: akeskin@selcuk.edu.tr; Noiri, Takashi [Department of Mathematics, Faculty of Science and Arts, Selcuk University Campus, 42075 Konya (Turkey); 2949-1 Shiokita-cho, Hinagu, Yatsushiro-shi, Kumamoto-ken 869-5142 (Japan)], E-mail: t.noiri@nifty.com

2009-10-15

In this paper, we introduce and investigate the notion of almost contra-g-continuous functions which is weaker than both notions of contra-continuous functions [Dontchev J. Contra-continuous functions and strongly S-closed mappings. Int J Math Math Sci 1996;19:303-10] and ({theta},s)-continuous functions [Joseph JK, Kwak MK. On S-closed spaces. Proc Am Math Soc 1980;80:341-8.] in topological spaces. We discuss the relationships with some other related functions. At the same time, we show that almost-g-continuity and (LC,s)-continuity are independent of each other.

Almost contra-g-continuous functions

International Nuclear Information System (INIS)

Keskin, Aynur; Noiri, Takashi

2009-01-01

In this paper, we introduce and investigate the notion of almost contra-g-continuous functions which is weaker than both notions of contra-continuous functions [Dontchev J. Contra-continuous functions and strongly S-closed mappings. Int J Math Math Sci 1996;19:303-10] and (θ,s)-continuous functions [Joseph JK, Kwak MK. On S-closed spaces. Proc Am Math Soc 1980;80:341-8.] in topological spaces. We discuss the relationships with some other related functions. At the same time, we show that almost-g-continuity and (LC,s)-continuity are independent of each other.

Prodduction of clone secretor of antibodies (IgG againt of infection bursal disease virus

Directory of Open Access Journals (Sweden)

Sandra Yuliet Marín

2015-06-01

Full Text Available ABSTRACT. Marín S.Y., dos Santos B.M., Patarroyo J.H. & Vargas M.I. [Prodduction of clone secretor of antibodies (IgG againt of infection bursal disease virus.] Produção de clones secretores de anticorpos (IgG contra o vírus da doença infecciosa bursal. Revista Brasileira de Medicina Veterinária, 37(2:238-144, 2015. Programa de Pós-Graduação em Medicina Veterinária, Universidade Federal de Viçosa, Avenida PH Rolfs, s/n, Viçosa, MG 36570- 000, Brasil. E-mail: bmsantos@ufv.br Three clones secreting of antibodies (Abs IgG against infection bursal disease virus IBDV was development. The IBDV was strain S706 (the intermediate vaccine was replicated in VERO cell and purified by sucrose gradient, for ELISA and mice inoculation. For the immunization of the mice BALB/c using as a saponin adjuvant, that allowed an inflammation reaction which enhanced the antibody response, detectable by ELISA. The fusion of splenic cells of the immunized mice and the mieloma SP2/0 resulted in 2 hybridoma families (2H11 and 5C7. After cloning by limiting dilution, 3 clones secretors of Abs from IgG class were obtained. The 3 obtained Abs were capable to reveal the proteins turn VPX and VP2 by “western blotting”, respectively of 47 kDa and 41 kDa. The definition of the isotypes recognized by obtained Abs must be object of characterization to allow the use of the antibodies in immunodiagnostic tests such as immunofluorescence, immunocitochemistry or capture ELISA, for epidemiologic of the disease researches or to differentiate vaccine’s virus of the field virus.

IgG4-Related Tubulointerstitial Nephritis.

Science.gov (United States)

Zhang, Pingchuan; Cornell, Lynn D

2017-03-01

Immunoglobulin G4 (IgG4)-related disease (IgG4-RD) is a fibroinflammatory disorder that can involve nearly any organ. The disorder has increasingly become known as a distinct clinical entity during the last decade. IgG4-related tubulointerstitial nephritis (IgG4-TIN) is the most common manifestation of IgG4-RD in the kidney. Many patients with IgG4-TIN are diagnosed after IgG4-RD has been recognized in other organ systems, but the kidney may also be the first or only site involved. The presenting clinical features of IgG4-TIN are most commonly kidney insufficiency, kidney mass lesion(s), or both. On biopsy, IgG4-TIN shows a dense lymphoplasmacytic infiltrate, increased IgG4+ plasma cells, storiform fibrosis, and often tubular basement membrane immune complex deposits. Elevation of serum IgG4 often accompanies IgG4-RD; however, it is not specific in reaching the diagnosis. Like IgG4-RD in other organs, IgG4-TIN characteristically responds promptly to steroids, although there is a high relapse rate on discontinuation of immunosuppression. The pathogenesis of IgG4-RD is not understood. Copyright © 2016 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.

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

Directory of Open Access Journals (Sweden)

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.

IgG4-related disease

DEFF Research Database (Denmark)

Detlefsen, Sönke; Klöppel, Günter

2018-01-01

disease (IgG4-RD). The histologic key findings are lymphoplasmacytic infiltration rich in IgG4-positive plasma cells combined with storiform fibrosis and obliterative phlebitis. Among the organs mainly affected by IgG4-RD are the pancreas and the extrahepatic bile ducts. The pancreatic and biliary...... alterations have been described under the terms autoimmune pancreatitis (AIP) and sclerosing cholangitis, respectively. These diseases are currently more precisely called IgG4-related pancreatitis (or type 1 AIP to distinguish it from type 2 AIP that is unrelated to IgG4-RD) and IgG4-related sclerosing...... cholangitis (IgG4-related SC). Clinically and grossly, both diseases commonly imitate pancreatic and biliary adenocarcinoma, tumors that are well known for their dismal prognosis. As IgG4-RD responds to steroid treatment, making a resection of a suspected tumor unnecessary, a biopsy is often required...

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

Directory of Open Access Journals (Sweden)

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.

A condition closely mimicking IgG4-related disease despite the absence of serum IgG4 elevation and IgG4-positive plasma cell infiltration.

Science.gov (United States)

Hara, Satoshi; Kawano, Mitsuhiro; Mizushima, Ichiro; Yamada, Kazunori; Fujita, Kentaro; Harada, Kenichi; Matsumura, Masami; Yamagishi, Masakazu; Sato, Yasuharu; Yamaguchi, Yutaka; Nakanuma, Yasuni; Nagata, Michio

2016-09-01

We describe a 74-year-old Japanese man with systemic fibroinflammatory conditions closely resembling those of immunoglobulin G4-related disease (IgG4-RD). Radiology and histology showed characteristics of IgG4-related tubulointerstitial nephritis, despite normal serum IgG4 value and scanty IgG4-positive plasma cell infiltration in each organ. This case suggests that a condition closely mimicking IgG4-RD may develop without IgG4-positive plasma cells and those exceptional cases should also be taken into account in the differential diagnosis of IgG4-RD.

IgG4-related nephropathy.

Science.gov (United States)

Quattrocchio, Giacomo; Roccatello, Dario

2016-08-01

IgG4-related disease (IgG4-RD) is a recently recognized disorder, often with multiple organ involvement, characterized by dense tissue infiltration of IgG4-positive plasma cells, storiform fibrosis, obliterative phlebitis and frequently elevated serum IgG4 concentration. The kidney can be involved either directly or indirectly. The most frequent direct renal manifestations of IgG4-RD are IgG4-related tubulointerstitial nephritis (TIN) and membranous glomerulonephropathy. Retroperitoneal fibrosis (RPF) is another condition that is frequently IgG4-related and that can indirectly affect the kidney causing ureteral obstruction and hydronephrosis. Contrast-enhanced computerized tomography, magnetic resonance imaging and (18)F-fluorodeoxyglucose positron emission tomography/computed tomography show different imaging findings and are useful tools for monitoring therapeutic response. Steroid treatment is the first line of therapy, but relapsing or refractory forms of the disease are frequently observed and require more aggressive therapeutic approaches. At our centre, we treated three cases of aggressive IgG4-related TIN and two cases of IgG4-related RPF with an intensified, immune suppressive protocol, obtaining good results without severe adverse effects.

Fibrosis pulmonar asociada a vasculitis con anticuerpos anticitoplasmáticos positivos

OpenAIRE

Marcelo Fernández Casares; Alejandra González; Flavia Caputo; Yanina Bottinelli; Patricia Nastavi; Marcelo Zamboni

2012-01-01

Las complicaciones pulmonares más conocidas de las vasculitis con anticuerpos anticitoplasmáticos de los neutrófilos (ANCA) positivos (VAA), son la hemorragia alveolar, los granulomas y la estenosis de la vía aérea. En los últimos años han aparecido algunos informes aislados que muestran la asociación con fibrosis pulmonar (FP), sugiriendo que ésta sería otra complicación de las VAA. En este trabajo informamos dos casos con dicha asociación describiendo sus características clínicas, tomográfi...

Obtención de extractos de membrana externa de Vibrio cholerae O1, mediante el uso de diferentes detergentes

Directory of Open Access Journals (Sweden)

José Luis Pérez

2006-04-01

Full Text Available En la actualidad existen dos variantes principales de vacunas orales contra el cólera: una basada en células inactivadas de diferentes biotipos y serotipos y otra basada en la administración de cepas vivas genéticamente atenuadas. Una vacuna por subunidades pudiera ser una variante muy atractiva. Este trabajo describe la purificación parcial y caracterización preliminar de extractos de proteínas de membrana externa-lipopolisacárido (PME-LPS, obtenidos a partir de Vibrio cholerae O1, con el interés de seleccionar un proteoliposoma que posteriormente será estructurado en forma de cocleatos para su uso por vía oral en humanos. Las preparaciones fueron obtenidas a través del uso de diferentes detergentes. La cantidad de LPS en cada preparación fue estimada mediante la determinación de las unidades endotóxicas en el ensayo del Limulus (LAL. La composición de cada muestra fue evaluada mediante SDS-PAGE y Dot Blot. La inoculación intranasal (IN en ratones Balb/c se utilizó para la evaluación de la inmunogenicidad de las preparaciones, y la respuesta inmune fue determinada por ELISA y el título de anticuerpos vibriocidas. El tamaño molecular de la preparación con mejores resultados en inmunogenicidad se estimó mediante la cromatografía en Sephacryl S-1000. Se obtuvieron diferentes perfiles electroforéticos de acuerdo con el tipo de detergente utilizado. El LPS fue identificado en todas las preparaciones y aquella obtenida con el SDS al 15% mostró la más baja relación proteínas/LPS y los mejores resultados en los ensayos de inmunogenicidad. Adicionalmente se comprobó que su tamaño molecular es similar al observado en el proteoliposoma de VAMENGOC- BC. La preparación obtenida con el SDS al 15% constituye un proteoliposoma, con capacidad para estimular altos niveles de anticuerpos IgG anti-LPS y altos títulos de anticuerpos vibriocidas, luego de su administración por vía intranasal en ratones. Estos resultados constituyen

IgG4 plasma cell myeloma: new insights into the pathogenesis of IgG4-related disease.

Science.gov (United States)

Geyer, Julia T; Niesvizky, Ruben; Jayabalan, David S; Mathew, Susan; Subramaniyam, Shivakumar; Geyer, Alexander I; Orazi, Attilio; Ely, Scott A

2014-03-01

IgG4-related disease is a newly described systemic fibroinflammatory process, characterized by increase in IgG4-positive plasma cells. Its pathogenesis, including the role of IgG4, remains poorly understood. Plasma cell myeloma is typically associated with a large monoclonal serum spike, which is frequently of IgG isotype. We sought to identify and characterize a subset of IgG4-secreting myeloma, as it may provide a biological model of disease with high serum levels of IgG4. Six out of 158 bone marrow biopsies (4%) from patients with IgG myeloma expressed IgG4. Four patients were men and two were women, with a mean age of 64 (range 53-87) years. Imaging showed fullness of pancreatic head (1), small non-metabolic lymphadenopathy (1), and bone lytic lesions (6). Two patients developed necrotizing fasciitis. All had elevated serum M-protein (mean 2.4, range 0.5-4.2 g/dl), and none had definite signs or symptoms of IgG4-related disease. Four myelomas had plasmablastic morphology. Four had kappa and two had lambda light chain expression. Three cases expressed CD56. Two patients had a complex karyotype. In conclusion, the frequency of IgG4 myeloma correlates with the normal distribution of IgG4 isoform. The patients with IgG4 myeloma appear to have a high rate of plasmablastic morphology and could be predisposed to necrotizing fasciitis. Despite high serum levels of IgG4, none had evidence of IgG4-related disease. These findings suggest that the increased number of IgG4-positive plasma cells is not the primary etiologic agent in IgG4-related disease. Elevated serum levels of IgG4 is not sufficient to produce the typical disease presentation and should not be considered diagnostic of IgG4-related disease.

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

Determinación de anticuerpos anti Neospora caninum en vacas de la provincia de Sugamuxi, Colombia

Directory of Open Access Journals (Sweden)

Martín Orlando Pulido Medellín

2013-01-01

Full Text Available El objetivo fue determinar la presencia de anticuerpos anti Neospora caninum en vacas mediante la técnica de ELISA indirecta en el valle de Sugamuxi, Colombia, identificando las variables que influyen en la susceptibilidad de los bovinos al protozoo. Se tomaron muestras de sangre a 400 hembras bovinas y fueron evaluadas por medio de ELISA indirecta. Se determinó una seroprevalencia de Neospora caninum del 57.5 %; no se halló relación entre las hembras en gestación y la presencia del parásito; para la presencia de celo se encontró que el 27.7 % de vacas infectadas por el parásito presentaron repetición de éste. La presencia del parásito fue del 100 % en hembras con historial de cinco partos. Los resultados de este estudio muestran la presencia de anticuerpos anti Neospora caninum en los animales pertenecientes a fincas lecheras de la provincia de Sugamuxi, y la alta prevalencia muestra el riesgo potencial para este tipo de explotaciones.

A new generalization of contra-continuity via Levine's g-closed sets

International Nuclear Information System (INIS)

Caldas, Miguel; Jafari, Saeid; Noiri, Takashi; Simoes, Marilda

2007-01-01

In [Dontchev J. Contra-continuous functions and strongly S-closed spaces. Int J Math Math Sci 1996;19:303-10], Dontchev introduced and investigated a new notion of continuity called contra-continuity. Recently, Jafari and Noiri [Jafari S, Noiri T. Contra-α-continuous functions between topological spaces. Iran Int J Sci 2001;2:153-67, Jafari S, Noiri T. Contra-super-continuous functions. Ann Univ Sci Budapest 1999;42:27-34, Jafari S, Noiri T. On contra-precontinuous functions. Bull Malaysian Math Sci Soc 2002;25(2):115-28] introduced new generalizations of contra-continuity called contra-α-continuity, contra-super-continuity and contra-precontinuity. In this paper, we introduce and investigate a generalization of contra-continuity by utilizing Levine's generalized closed sets

Detection of Serum IgG4 Levels in Patients with IgG4-Related Disease and Other Disorders

Science.gov (United States)

Wang, Chenqiong; Wu, Xuefen; Miao, Ye; Xiong, Hui; Bai, Lin; Dong, Lingli

2015-01-01

Objective 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. Methods 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. Results 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. Conclusion 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. PMID:25885536

Diagnostic Performance of Serum IgG4 Levels in Patients With IgG4-Related Disease

Science.gov (United States)

Yu, Kuang-Hui; Chan, Tien-Ming; Tsai, Ping-Han; Chen, Ching-Hui; Chang, Pi-Yueh

2015-01-01

Abstract The aim of this study is to study the clinical features and diagnostic performance of IgG4 in Chinese populations with IgG4-related diseases (IgG4-RDs). The medical records of 2901 adult subjects who underwent serum IgG4 level tests conducted between December 2007 and May 2014 were reviewed. Serum concentrations of IgG4 were measured in 2901 cases, including 161 (5.6%) patients with IgG4-RD and 2740 (94.4%) patients without IgG4-RD (non-IgG4-RD group). The mean age of the IgG4-RD patients was 58.4 ± 16.1 years (range: 21–87), and 48 (29.8%) were women. The mean serum IgG4 level was significantly much higher in IgG4-RD patients than in non-IgG4-RD (1062.6 vs 104.3 mg/dL, P IgG4 >135 mg/dL, the sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), likelihood ratio (LR)+, and LR− were 86%, 77%, 18%, 99%, 3.70, and 0.19, respectively. When the upper limit of normal was doubled for an IgG4 >270 mg/dL, the corresponding data were 75%, 94%, 43%, 98%, 12.79, and 0.26, respectively. For IgG4 >405 mg/dL (tripling the upper limit of normal), the corresponding data were 62%, 98%, 68%, 98%, 37.00, and 0.39, respectively. When calculated according to the manufacturer's package insert cutoff (>201 mg/dL) for the diagnosis of IgG4-RD, the corresponding sensitivity, specificity, PPV, NPV, LR+, and LR− were 80%, 89%, 29%, 99%, 7.00, and 0.23, respectively. For IgG4 >402 mg/dL (>2× the upper limit of the normal range), the corresponding data were 62%, 98%, 68%, 98%, 36.21, and 0.39, respectively. For IgG4 >603 mg/dL (>3× the upper limit of the normal range), the corresponding data were 50%, 99%, 84%, 97%, 90.77 and 0.51, respectively. The optimal cutoff value of serum IgG4 (measured by nephelometry using a Siemens BN ProSpec instrument and Siemens reagent) for the diagnosis of IgG4-RD was 248 mg/dL, the sensitivity and specificity were 77.6% and 92.8%, respectively. The present study demonstrated that 2 or

Inmunodiagnóstico de la infección en humanos por Trypanosoma cruzi mediante ELISA utilizando sangre recolectada en papel de filtro

Directory of Open Access Journals (Sweden)

Luis C. Orozco

1999-06-01

Full Text Available Los estudios seroepidemiológicos para la detección de anticuerpos contra Trypanosoma cruzi requieren de un gran número de muestras y la obtención de sangre por punción venosa y su transporte se hacen difíciles y costosos. La recolección de sangre en papel de filtro minimiza éstas dificultades y el estudio valoró tanto éste sistema como la validez y reproducibilidad del inmunoensayo ELlSA para el inmunodiagnóstico de la infección en humanos por T cruzi Se utilizó suero y eluídos de sangre recolectada en papel de filtro de personas de zona endémica de enfermedad de Chagas para la detección de anticuerpos contra T cruzi mediante las pruebas de inmunofluorescencia indirecta (IFI y ELISA. Lavalidez del ELlSA utilizando eluídos de sangre en papel de filtro presentó un área bajo la curva de receptor operador (ROC de 0.9944. El acuerdo del ELlSA entre los dos tipos de muestra presentó una distribución cercana a la normal con un promedio de -0.01 y una desviación estándar de 0.23. Se evidenció que la reproducibilidad del IFI es inferior a la del ELISA. Esta mayor concordancia y la mayor sensibilidad y especificidad encontrada previamente para el ELISA hacen pensar en la posibilidad de presentarla como alternativa de prueba de referencia para la detección de anticuerpos contra 7: cruziy su utilización en estudios epidemiológicos.

Falsely low immunoglobulin (Ig)G4 in routine analysis: how not to miss IgG4 disease.

Science.gov (United States)

Egner, W; Swallow, K; Lock, R J; Patel, D

2016-10-01

Immunoglobulin (Ig)G4 disease can have apparently 'normal' levels of IgG4 due to antigen excess conditions. IgG4 measurement therefore appears falsely low. UK National External Quality Assurance Scheme (UK NEQAS) data and other reports have suggested that this problem occurred despite pre-existing antigen excess detection steps. To determine the clinical relevance of the problem, we examined the prevalence and characteristics of prozoning in our laboratory and patient cohorts. We establish that the prevalence of raised IgG4 in routine IgG4 analysis is low (IgG4 samples in our patients. This may explain the previous reports of low sensitivity of raised IgG4 for IgG4RD, and predictive values should be re-evaluated in this disease using modified prozone-resistant protocols. All laboratories providing IgG4 measurements should verify that their assays are fit for the clinical quality requirement of detection raised IgG4 levels and must verify the upper limit of their reference ranges and freedom from prozoning. © 2016 British Society for Immunology.

IgG4-related disease.

Science.gov (United States)

Bozzalla Cassione, Emanuele; Stone, John H

2017-05-01

Remarkable insights have been gleaned recently with regard to the pathophysiology of IgG4-related disease (IgG4-RD). These findings have direct implications for the development of targeted strategies for the treatment of this condition. Oligoclonal expansions of cells of both the B and T lymphocyte lineages are present in the blood of patients with IgG4-RD. Oligoclonal expansions of plasmablasts are a good biomarker for disease activity. An oligoclonally expanded population of CD4+ cytotoxic T lymphocytes is found not only in the peripheral blood but also at tissue sites of active disease. This cell elaborates cytokines that may drive the fibrosis characteristic of IgG4-RD. T follicular helper cells (Tfhc), particularly the Tfhc2 subset, appear to play a major role in driving the class switch to IgG4 that typifies this disease. The relationship between malignancy and IgG4-RD remains an area of interest. Advances in understanding the pathophysiology of IgG4-RD have proceeded swiftly, leading to the identification of a number of potential targeted treatment strategies. The completion of classification criteria for IgG4-RD, an effort supported jointly by the American College of Rheumatology and the European League Against Rheumatism, will further facilitate studies on this disease.

Radioimmunoassay of IgG and IgM rheumatoid factors reacting with human IgG

International Nuclear Information System (INIS)

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

1977-01-01

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

MODELLING THE DYNAMICS OF ANTIBODY PRODUCTION IN BIRDS

Directory of Open Access Journals (Sweden)

ANDRÉS OLARTE

2011-01-01

Full Text Available En este artículo se presenta un modelo dinámico de la respuesta inmune humoral de aves para la producción de anticuerpos específi cos. Los anticuerpos son fundamentales para la investigación, diagnóstico y tratamiento de diversas enfermedades. Se ha reconocido que los anticuerpos obtenidos de aves de corral son una opción efi ciente para aplicaciones en medicina y biología. Por tanto, un modelo que represente la dinámica de este proceso resulta de gran utilidad. El modelo está compuesto de siete ecuaciones diferenciales ordinarias, no lineales, con coefi cientes constantes y representa las principales poblaciones celulares y moleculares de la respuesta inmune de las aves. Los parámetros se obtuvieron a partir de datos reportados en el área de inmunología aviar y mamífera. Las respuestas obtenidas "in silico" en términos de la concentración de anticuerpos se presentan y se comparan contra la cinética reportada.

IgG4-producing lymphoma arising in a patient with IgG4-related disease.

Science.gov (United States)

Igawa, Takuro; Hayashi, Toshiaki; Ishiguro, Kazuya; Maruyama, Yumiko; Takeuchi, Mai; Takata, Katsuyoshi; Yoshino, Tadashi; Sato, Yasuharu

2016-12-01

We herein report a case in which an IgG4-producing lymphoma arose in a patient with a previous diagnosis consistent with an IgG4-related disease. A 43-year-old man presented with enlarged cervical lymph nodes and was treated with steroids and radiation for what was initially assumed to be Kimura's disease, although the lesions were later histologically re-diagnosed as IgG4-related lymphadenopathy. Fourteen years later, when the patient was 58-years-old, he presented with retroperitoneal fibrosis and swollen lymph nodes. The suspicious lesions were not histologically examined as the patient did not give consent. However, the serum IgG4 concentration was high (1400 mg/dL) and he was clinically diagnosed with systemic IgG4-related disease. Although steroid administration reduced the size of the lesions, tapering the dose finally resulted in systemic, prominently enlarged lymph nodes. Analysis of the biopsy specimen revealed that these multiple lymph node lesions were marginal zone B cell lymphomas that themselves expressed IgG4. Complete remission was achieved after a total of six courses of chemotherapy including rituximab. This case suggests that the infiltrating IgG4-expressing cells observed in IgG4-related disease can clonally expand to malignant lymphomas.

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...

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

Full Text Available OBJETIVO: Estimar a soroprevalência de anticorpos por vírus herpes simples (HSV-1 e HSV-2 e analisar fatores associados no Brasil. MÉTODOS: Estudo transversal realizado entre 1996 e 1997 em 1.090 indivíduos com idade entre um e 40 anos da população geral, em quatro diferentes regiões geográficas no Brasil. Foram analisadas amostras sangüíneas para detecção de anticorpos para HSV-1 e HSV-2 com teste tipo-específico Elisa. Foram descritas freqüências e proporções, comparadas entre grupos utilizando o teste de Fisher bilateral exato. Foi realizada análise de regressão logística para avaliar influência das variáveis sociodemográficas e histórico de DST, sobre a soroprevalência de HSV-1 e/ou HSV-2. RESULTADOS: As soroprevalências de anticorpos para HSV-1 e HSV-2, ajustadas por idade, foram 67,2% e 11,3% respectivamente, sem diferença quanto ao sexo e maiores na Região Norte. As soroprevalências aumentaram com a idade, e para HSV-2 o maior aumento ocorreu na adolescência e entre adultos jovens. Indivíduos soropositivos para HSV-1 apresentaram maior risco de serem positivos para HSV-2 (15,7% quando comparados com os negativos para HSV-1 (4,7%. Na análise multivariada, o histórico de DST aumentou significativamente (OR=3,2 a probabilidade de soropositividade para HSV-2. CONCLUSÕES: As soroprevalências para HSV-1 e para HSV-2 variam com a idade e entre as regiões do Brasil. História pregressa de DST é importante fator de risco para aquisição de infecção por HSV-2.OBJETIVO: Estimar la seroprevalencia de anticuerpos por virus herpes simples (HSV-1 y HSV-2 en diferentes áreas geográficas en Brasil y analizar factores asociados. MÉTODOS: Estudio transversal realizado entre 1996 y 1997 con individuos de la población en general en cuatro diferentes áreas geográficas en Brasil y estratificados por edad (de uno a 40 años y sexo, de los cuales 1.090 fueron incluidos en el análisis final. Fueron analizadas muestras

IgG4-Related Sclerosing Cholangitis.

Science.gov (United States)

Nakazawa, Takahiro; Shimizu, Shuya; Naitoh, Itaru

2016-08-01

More men than women develop immunoglobulin G4-related sclerosing cholangitis (IgG4-SC). Age at clinical onset is significantly older in patients with IgG4-SC. Patients with IgG4-SC appear similar to those with cholangiocarcinoma and primary sclerosing cholangitis (PSC). The association between IgG4-SC and autoimmune pancreatitis (AIP) is useful for the diagnosis of IgG4-SC. However, some IgG4-SC cases are isolated from AIP and are difficult to diagnose. The authors focus on three distinct features of IgG4-SC. First, diffuse inflammation induces a longer stenosis on cholangiography in contrast to the short stenosis of patients with PSC. Second, fibroinflammatory involvement is observed mainly in the stroma of the bile duct wall, whereas the bile duct epithelium is intact. Third, steroid therapy results in remarkable improvement. Although the prognosis of patients with IgG4-SC is good, some cases have developed portal hypertension and liver cirrhosis during their clinical course. Further study is needed to elucidate the long-term outcomes and mechanism of IgG4-SC. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

Histopathologie der IgG4-RD

DEFF Research Database (Denmark)

Detlefsen, S; Klöppel, G

2016-01-01

infiltrate, 2) storiform fibrosis and 3) obliterative phlebitis. The diagnosis is further supported by immunohistochemical demonstration of an increased infiltration of IgG4-positive plasma cells and an elevated IgG4/IgG ratio. The morphological criteria of IgG4-RD are in most cases detectable in biopsies...

On the role of IgG4 in inflammatory conditions: lessons for IgG4-related disease

NARCIS (Netherlands)

Trampert, David C.; Hubers, Lowiek M.; van de Graaf, Stan F. J.; Beuers, Ulrich

2017-01-01

The pathophysiology of immunoglobulin G4-related disease (IgG4-RD) and its most common manifestations, IgG4-associated (sclerosing) cholangitis and autoimmune pancreatitis, remains largely unknown, but IgG4 is presumably involved. IgG4 is a promiscuous antibody, which could be directly pathogenic,

A Comparative Analysis of Serum IgG4 Levels in Patients With IgG4-Related Disease and Other Disorders.

Science.gov (United States)

Wang, Li; Chu, Xinmin; Ma, Yan; Zhang, Min; Wang, Xue; Jin, Li; Tan, Zhen; Li, Xiangpei; Li, Xiaomei

2017-09-01

Elevated serum IgG4 levels are an important hallmark for diagnosing IgG4-related disease (IgG4-RD) but can also be found and reported in other diseases. The present study intended to compare the serum IgG4 levels in both IgG4-RD and non-IgG4-RD and determine the serum IgG4 levels in patients with IgG4-RD before and after glucocorticoid therapy. The study included 323 patients from Anhui Medical University Affiliated Provincial Hospital (China) and was conducted from July 2014-January 2016. A total of 25 patients were eventually diagnosed as having IgG4-RD, according to the IgG4-RD diagnostic criteria. Our study also included 108 patients with connective tissue disease, 94 patients with pancreatic lesions, 66 patients with bile duct lesions, 13 patients with carcinoma of the duodenal papilla and 20 control participants. The assay for serum IgG4 detection was peformed using the nephelometric method. Elevated levels of serum IgG4 (>1.35g/L) were detected in all patients with IgG4-RD, and reduced levels of serum IgG4 (IgG4-RD. The serum IgG4 level in patients with IgG4-RD after glucocorticoid therapy was significantly lower than that before glucocorticoid therapy (t = 2.426, P = 0.04). High levels of IgG4 were observed in IgG4-RD. However, a diagnosis of IgG4 disease can not only be dependent on the detection of elevated serum IgG4 levels but also may need clinical manifestations, serology, histopathology and other comprehensive information for verification. Copyright © 2017 Southern Society for Clinical Investigation. Published by Elsevier Inc. All rights reserved.

Histopathological Diagnostic Value of the IgG4+/IgG+ Ratio of Plasmacytic Infiltration for IgG4-Related Diseases

Science.gov (United States)

Deng, Chuiwen; Li, Wenli; Chen, Si; Zhang, Wen; Li, Jing; Hu, Chaojun; Wen, Xiaoting; Zhang, Fengchun; Li, Yongzhe

2015-01-01

Abstract This article aims to perform a meta-analysis to evaluate the diagnostic value of the immunoglobulin G (IgG)4+/IgG+ ratio of plasmacytic infiltration for IgG4-related diseases. Four databases—EMBASE, ISI Web of Knowledge, PubMed, and the Cochrane Library—were systematically searched. Approximately 200 participants from several studies were included in this research. STATA 11.2 software (Stata Corporation, College Station, TX) and Meta-DiSc 1.4 (Unit of Clinical Biostatistics, Ramon y Cajal Hospital, Madrid, Spain) were used to perform the meta-analysis. Nine studies were included in the meta-analysis. The pooled diagnostic odds ratio was 18.94 [95% confidence interval (CI), 2.89–124.30]. The sensitivity was 58.80% (95% CI, 50.90–66.30) and the specificity was 90.20% (95% CI, 81.20–95.80). The positive and negative likelihood ratios were 3.12 (95% CI, 1.07–9.16) and 0.26 (95% CI, 0.09–0.70), respectively. The area under the curve of the summary receiver-operating characteristic was 0.88. To conclude, the IgG4+/IgG+ ratio of plasmacytic infiltration is modestly effective in diagnosing IgG-related disease. PMID:25738476

Violence against Amazon women Violencia contra mujeres amazónicas Violência contra mulheres amazônicas

Directory of Open Access Journals (Sweden)

Vera Lúcia de Azevedo Lima

2009-12-01

Full Text Available This quantitative and exploratory study analyzed violence against Amazon women presented in print media according to type and severity, and whether aggressors fell under the Maria da Penha law. A total of 181 issues of a regional newspaper were consulted. Based on content analysis, 164 items addressing violence against women were selected and 46 were included in the corpus of analysis. Results were gathered in three thematic groups: women killed with cruelty, sexual violence against women regardless of age, and violence against women and the limitations of the Maria da Penha law. Violence against these women varied in terms of form and severity, including up to homicide. Women are submitted to sexual violence from childhood through adulthood. The enforcement of this law shows the community it has a means to cope with this social phenomenon.Este es un estudio exploratorio de naturaleza cualitativa, que se realizó con el objetivo de analizar la violencia contra mujeres amazónicas, presentada en los periódicos, según el tipo y su gravedad, y citación de encuadramiento del agresor en la Ley Maria de la Penha. Fueron consultados 181 ejemplares de un periódico regional. A partir del análisis de contenido, fueron seleccionadas 164 notas sobre violencias contra mujeres, de ellas 46 fueron incluidas como corpus de análisis. Los resultados fueron reunidos en tres grupos temáticos: mujeres asesinadas con crueldad, la violencia sexual contra mujeres no tiene edad y la violencia contra mujeres y el límite de la Ley Maria de la Penha. La violencia contra esas mujeres presentó variación en cuanto a la forma y a la gravedad, ocurriendo inclusive homicidios. Las mujeres son sometidas a violencia sexual desde la infancia hasta la edad adulta. El encuadramiento legal del agresor demuestra a la comunidad un medio para enfrentamiento de ese fenómeno social.Este é um estudo exploratório de natureza qualitativa, com o objetivo de analisar a viol

Violencia contra las mujeres y alguien mas...

OpenAIRE

Piatti, Mª de Lujan

2013-01-01

La violencia contra las mujeres es una clara vulneración a sus derechos humanos. Es una violencia ejercida contra ellas por el solo hecho de ser mujeres; no se trata de casos aislados, sino que constituye un fenómeno social, presente en la sociedad actual sin distinción de razas, lugar geográfico, nivel cultural, religión, sistema político o económico. Investigar sobre “La violencia contra las mujeres y alguien más…”, desde una mirada multidisciplinar, significa bucear en las profundidades de...

Serological blind spots for variants of human IgG3 and IgG4 by a commonly used anti-immunoglobulin reagent.

Science.gov (United States)

Howie, Heather L; Delaney, Meghan; Wang, Xiaohong; Er, Lay See; Vidarsson, Gestur; Stegmann, Tamara C; Kapp, Linda; Lebedev, Jenna N; Wu, Yanyun; AuBuchon, James P; Zimring, James C

2016-12-01

Human immunoglobulin G (IgG) includes four different subtypes (IgG1, IgG2, IgG3, and IgG4), and it is also now appreciated that there are genetic variations within IgG subtypes (called isoallotypes). Twenty-nine different isoallotypes have been described, with 7, 4, 15, and 3 isoallotypes described for IgG1, IgG2, IgG3, and IgG4, respectively. The reactivity of anti-IgG with different isoallotypes has not been characterized. A novel monoclonal anti-K antibody (PugetSound Monoclonal Antibody 1 [PUMA1]) was isolated and sequenced, and a panel of PUMA1 variants was expressed, consisting of the 29 known IgG isoallotypes. The resulting panel of antibodies was preincubated with K-positive red blood cells (RBCs) and then subjected to testing with currently approved anti-IgG by flow cytometry, solid phase systems, gel cards, and tube testing. A US Food and Drug Administration (FDA)-approved monoclonal anti-IgG (gamma-clone) failed to recognize 2 of 15 IgG3 isoallotypes (IgG3-03 and IgG3-13) and 3 of 3 IgG4 isoallotypes (IgG4-01, IgG4-02, and IgG4-03). In contrast, an FDA-approved rabbit polyclonal anti-IgG recognized each of the known human IgG isoallotypes. These findings demonstrate "blind spots" in isoalloantibody detection by a monoclonal anti-IgG. If a patient has anti-RBC antibodies predominantly of an IgG3 subtype (the IgG3-03 and/or IgG3-13 variety), then it is possible that a clinically significant alloantibody would be missed. IgG-03 and IgG-13 have an estimated frequency of 1% to 3% in Caucasian populations and 20% to 30% in certain African populations. Nonreactivity with IgG4 is a known characteristic of this monoclonal anti-IgG, but IgG4 isoallotypes have not been previously reported. © 2016 AABB.

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.

Anuncio de servicio público sobre la tosferina (:30) (Whooping Cough Public Service Announcement)

Centers for Disease Control (CDC) Podcasts

2015-04-13

Este anuncio de servicio público, de 30 segundos, alienta a las mujeres embarazadas a ponerse la vacuna contra la tosferina llamada Tdap, durante el tercer trimestre de cada embarazo, para que le pasen anticuerpos a su bebé a fin de que este nazca con protección contra esta grave enfermedad.  Created: 4/13/2015 by National Center for Immunization and Respiratory Diseases (NCIRD), Division of Bacterial Diseases (DBD), Meningitis and Vaccine Preventable Diseases Branch (MVPDB).   Date Released: 4/13/2015.

Leptospirosis: Una enfermedad zoonótica hiperendémica en la provincia de Coronel Portillo. Ucayali, Perú

Directory of Open Access Journals (Sweden)

Manuel Céspedes Z

2004-04-01

Full Text Available Objetivo: Determinar la prevalencia de anticuerpos para leptospiras en personas asintomáticas en las localidades dedicadas al comercio y la agricultura de la provincia de Coronel Portillo, del departamento de Ucayali. Asimismo determinar la prevalencia de leptospirosis en animales domésticos. Material y Métodos: En este estudio transversal analítico, se tomó muestras de suero de 364 pobladores de 4 localidades, en quienes se evaluó la presencia de anticuerpos totales contra leptospiras en suero por el método de ELISA y la prueba de microaglutinación (MAT. Se realizó el análisis estadístico para ver el grado de asociación entre las características generales de la población y la información recopilada en la encuesta con la positividad para anticuerpos para leptospiras. De la misma manera, se tomó muestras de suero de 374 animales domésticos (canes a los que se realizó MAT. Resultados: Se enrolaron 364 personas de las cuales 227 (62,4% fueron mujeres y 137 (37,6% varones, 114 (31,3% pobladores tuvieron anticuerpos contra leptospiras y los serovares más frecuentes fueron Bratislava y Georgia según MAT, los probables factores asociados a la positividad a anticuerpos para leptospiras en los pobladores fueron: guardar alimentos en el hogar (OR=2,221, ser agricultor (OR=3,418, ser obrero y agricultor (OR=2,088, eliminar basura en el campo (OR=2,348. En canes, 181 (52,2% tuvieron serología positiva a leptospiras. Conclusiones: Existe una alta prevalencia de serología positiva para leptospiras en 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.

IgG4 Aortitis: A Case Report.

Science.gov (United States)

Marketkar, Shivali; LeGolvan, Mark

2017-04-03

IgG4 aortitis is one of the entities seen in the spectrum of IgG4-related disease (IgG4-RD). It is characterized by serologic (elevated serum IgG4) and histologic features including a lymphoplasmacytic infiltrate with increased numbers of IgG4-positive plasma cells, storiform fibrosis and obliterative phlebitis. Some studies have described a correlation between infections and IgG4 aortitis. We describe a patient with an aneurysm of the infrarenal descending abdominal aorta with features of IgG4-RD, as well as culture evidence of Streptococcus sanguis. [Full article available at http://rimed.org/rimedicaljournal-2017-04.asp].

Relative stabilities of IgG1 and IgG4 Fab domains: Influence of the light–heavy interchain disulfide bond architecture

Science.gov (United States)

Heads, James T; Adams, Ralph; D'Hooghe, Lena E; Page, Matt J T; Humphreys, David P; Popplewell, Andrew G; Lawson, Alastair D; Henry, Alistair J

2012-01-01

The stability of therapeutic antibodies is a prime pharmaceutical concern. In this work we examined thermal stability differences between human IgG1 and IgG4 Fab domains containing the same variable regions using the thermofluor assay. It was found that the IgG1 Fab domain is up to 11°C more stable than the IgG4 Fab domain containing the same variable region. We investigated the cause of this difference with the aim of developing a molecule with the enhanced stability of the IgG1 Fab and the biological properties of an IgG4 Fc. We found that replacing the seven residues, which differ between IgG1 CH1 and IgG4 CH1 domains, while retaining the native IgG1 light-heavy interchain disulfide (L–H) bond, did not affect thermal stability. Introducing the IgG1 type L–H interchain disulfide bond (DSB) into the IgG4 Fab resulted in an increase in thermal stability to levels observed in the IgG1 Fab with the same variable region. Conversely, replacement of the IgG1 L–H interchain DSB with the IgG4 type L–H interchain DSB reduced the thermal stability. We utilized the increased stability of the IgG1 Fab and designed a hybrid antibody with an IgG1 CH1 linked to an IgG4 Fc via an IgG1 hinge. This construct has the expected biophysical properties of both the IgG4 Fc and IgG1 Fab domains and may therefore be a pharmaceutically relevant format. PMID:22761163

IgG4-related spinal pachymeningitis.

Science.gov (United States)

Lu, Zhang; Tongxi, Liu; Jie, Luo; Yujuan, Jiao; Wei, Jiang; Xia, Liu; Yumin, Zheng; Xin, Lu

2016-06-01

The aim of this study is to study the clinical, laboratory, imaging pathology, and prognosis features of IgG4-related spinal pachymeningitis. We worked with a 55-year-old man suffering from IgG4-related spinal pachymeningitis who had the most widespread lesion in his dura mater. We also review previous related studies and discuss the clinical characteristics of this rare disease. In total, eight IgG4-related spinal pachymeningitis patients have been reported in the literature since 2009. They were mostly male patients, 51.7 ± 11.9 years old on average. Cervical and thoracic vertebrae were the most common sites for lesions. The most prominent symptom was varying numbness and weakness of the limbs and/or body associated with spinal cord compression. There was one patient (1/5) with elevated serum IgG4 levels and three patients (3/3) with increased cerebrospinal fluid (CSF) IgG4 index. Positive histopathologic findings are the strongest basis for a diagnosis. All the patients with IgG4-related spinal pachymeningitis responded well to glucocorticoid therapy. IgG4-related spinal pachymeningitis is an orphan disease that mainly occurs in cervical and thoracic vertebrae. Older males are the most susceptible group. Serum IgG4 levels were consistently normal in these cases, so analysis of CSF for IgG4 production (IgG4 index) could become a useful tool. Pathological findings remain the gold standard for diagnosis. Most patients responded favorably to glucocorticoid treatment.

Evaluación de la prueba de inmunofluorescencia indirecta para el diagnóstico de leptospirosis humana.

Directory of Open Access Journals (Sweden)

Piedad Agudelo Flórez

2006-06-01

Full Text Available Introducción. El diagnóstico de la leptospirosis es difícil debido al amplio espectro de síntomas clínicos que presenta. Varias pruebas diagnósticas serológicas se han desarrollado, pero su aplicación y utilidad en Colombia no han sido determinadas. Objetivos. Evaluar la prueba de inmunofluorescencia indirecta para el diagnóstico de leptospirosis humana y determinar así los anticuerpos de las clases inmunoglobulina G y M producidos contra Leptospira. Materiales y métodos. Se establecieron tres grupos de estudio. El primero incluyó 19 muestras positivas para leptospirosis de pacientes con diagnóstico clínico y prueba de microaglutinación positiva; el segundo, 40 muestras de personas sin antecedentes de leptospirosis y con microaglutinación negativa, y el tercero con 96 muestras de pacientes con otras enfermedades diferentes a leptospirosis. Todas las muestras fueron procesadas por inmunofluorescencia indirecta. Resultados. Se determinó que la inmunofluorescencia indirecta tiene sensibilidad de 89,47%, especificidad de 100%, valor predictivo negativo de 95,2% (IC95%82,6 a 99,2 y valor predictivo positivo de 100%. En forma paralela, un estudio exploratorio en 27 muestras de suero que habían sido remitidas para diagnóstico de diferentes síndromes febriles encontró que 11% de ellas fueron positivas por inmunofluorescencia indirecta para anticuerpos IgM contra Leptospira. Conclusiones. La inmunofluorescencia indirecta es una alternativa que complementa el diagnóstico de leptospirosis y los estudios seroepidemiológicos. La presencia de anticuerpos dirigidos contra Leptospira en las muestras de síndrome febril del estudio indica que la leptospirosis es una de las causas de este síndrome que el clínico debe explorar.

[IgG4 immunohistochemistry in Riedle thyroiditis].

Science.gov (United States)

Wang, S; Luo, Y F; Cao, J L; Zhang, H; Shi, X H; Liang, Z Y; Feng, R E

2017-03-08

Objective: To observe the histopathological changes and immunohistochemical expression of IgG4 in Riedle thyroiditis (RT) and to study the relationship between RT and IgG4-related diseases (IgG4-RD). Methods: A total of 5 RT patients were collected from the Department of Pathology, Peking Union Medical College Hospital during April 2012 to August 2014. The clinical and immunohistochemical features were analyzed in the 5 patients. Histopathologic analysis was performed on hematoxylin and eosin-stained sections. Results: There were one male and four female patients, aged 52 to 78 years (median 59 years). Five cases were characterized by multiple nodules of thyroid, which increased year by year. All patients were found to have surrounding tissue compression symptoms and signs. Two female patients were found to have hypothyroidism. The serum concentration of IgG was elevated in 2 cases, and the serum concentration of IgG was not tested before operation in the remaining patients. By ultrasound, all presented as low echo or medium low echo. Strong echo occasionally appeared in hypoechoic nodules. Microscopically, fibrous tissue hyperplasia was infiltrated with varying numbers of lymphocytes and plasma cells. The occlusion of phlebitis was found in 4 cases and eosinophils were found in 3 cases. IgG4 counts and IgG4/IgG ratios in 5 cases were 20/HPF, 16%; 60/HPF, 82%; 22/HPF, 28%; 400/HPF, 266% and 33/HPF, 71%, respectively. Conclusions: With the similar pathological manifestations between RT and IgG4-RD, immunohistochemical staining shows that the number of IgG4 positive plasma cells and IgG4/IgG ratio of RT are increased in varying degrees. Some cases meet the diagnostic criteria of IgG4-RD, and speculate that some cases of RT belong to IgG4-RD.

Cholangiocarcinoma with respect to IgG4 Reaction

Directory of Open Access Journals (Sweden)

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.

Contra pürib sajandi rahvakirjanikuks / Aivar Kull

Index Scriptorium Estoniae

Kull, Aivar, 1955-

2001-01-01

Contra [Konnula, Margus]. Suusamütsi tutt : luulet aastatest 1974-2000. Urvaste ; Tartu : Mina Ise, 2001. Vaata ka: Kull, Aivar. Kulli pilk. - Tartu : Ilmamaa, 2005, lk. 184-185, pealkirjaga "Contra - uue sajandi rahvakirjanik?"

El ácido siálico N-acetilado es inmunogénico e induce anticuerpos protectores contra Neisseria meningitidis

Directory of Open Access Journals (Sweden)

Gregory R. Moe

2009-08-01

Full Text Available Recently, we showed that monoclonal antibodies (mAbs that are reactive with derivatives of polysialic acid containing de-N-acetylated neuraminic acid (Neu residues are protective against N. meningitidis group B strains (Moe et al. 2005, Infect Immun 73:2123; Flitter et al., in preparation. In addition, we found that fully de-N-acetylated PSA (i.e. poly alpha 2,8 Neu conjugated to tetanus toxoid (DeNAc elicits IgM and IgG antibodies of all subclasses in mice that bind to group B strains, activate human complement deposition, are protective in an infant rat model of meningococcal bacteremia and are bactericidal against group C strains (Moe et al, in press. We show here that anti-DeNAc mAbs, DA1 and DA2 (both IgM, are reactive with polysaccharides containing Neu, bind to group B, C, W135 and Y but not X strains grown in chemically defined media (CDM. However, when the group X strain is grown in CDM supplemented with human plasma, DA2 binds. Also both mAbs mediate bactericidal activity against B, C, W135, and X strains with human complement. The esults suggests that N. meningitidis express and/or acquire zwitterionic de-N-acetyl sialic acid antigens that can be the target of protective antibodies.

Overview of IgG4 - Related Disease.

Science.gov (United States)

Opriţă, R; Opriţă, B; Berceanu, D; Diaconescu, I B

2017-01-01

Rationale (hypothesis): IgG4-related disease (IgG4-RD) is a pathological entity recently recognized by the medical world that can affect any organ or system. However, there is insufficient data about this disease in medical literature. Aim (objective): A more extensive clarification of the IgG4 molecule, the diversified aspects of IgG4-related disease, and the response of this disease to treatment, will provide a crucial understanding of the immune system and other diseases now known to be associated with IgG4. The MEDLINE online medical database was used, and, after a comprehensive review of medical articles regarding IgG4-RD, published after 2003, using the search words "IgG4- related disease" and "IgG4 molecule", we have described the clinical, pathological and therapeutic features of IgG4-RD, as well as the presence of the IgG4 molecule in the evolution, diagnosis and management of this syndrome. We characterized the potential disease mechanisms and discussed early observations related to treatment. Given the response to immunosuppressive therapy, it is hypothesized that IgG4-related disease is most likely an autoimmune disease. Therefore, IgG4-related disease is a fibro-inflammatory condition that can affect any organ and can lead to the formation of pseudotumoral lesions requiring differential diagnosis with various malignancies. Positive diagnostic criteria are histopathological and require at least two features out of the following three: dense limphoplasmocitary infiltrate, storiform fibrosis, obliterative phlebitis.

Potential of Murine IgG1 and Human IgG4 to Inhibit the Classical Complement and Fcγ Receptor Activation Pathways

Directory of Open Access Journals (Sweden)

Gina-Maria Lilienthal

2018-05-01

Full Text Available IgG antibodies (Abs mediate their effector functions through the interaction with Fcγ receptors (FcγRs and the complement factors. The main IgG-mediated complement activation pathway is induced through the binding of complement C1q to IgG Abs. This interaction is dependent on antigen-dependent hexamer formation of human IgG1 and IgG3 to increase the affinity for the six-headed C1q molecule. By contrast, human IgG4 fails to bind to C1q. Instead, it has been suggested that human IgG4 can block IgG1 and IgG3 hexamerization required for their binding to C1q and activating the complement. Here, we show that murine IgG1, which functionally resembles human IgG4 by not interacting with C1q, inhibits the binding of IgG2a, IgG2b, and IgG3 to C1q in vitro, and suppresses IgG2a-mediated complement activation in a hemolytic assay in an antigen-dependent and IgG subclass-specific manner. From this perspective, we discuss the potential of murine IgG1 and human IgG4 to block the complement activation as well as suppressive effects of sialylated IgG subclass Abs on FcγR-mediated immune cell activation. Accumulating evidence suggests that both mechanisms seem to be responsible for preventing uncontrolled IgG (autoAb-induced inflammation in mice and humans. Distinct IgG subclass distributions and functionally opposite IgG Fc glycosylation patterns might explain different outcomes of IgG-mediated immune responses and provide new therapeutic options through the induction, enrichment, or application of antigen-specific sialylated human IgG4 to prevent complement and FcγR activation as well.

Analysis of IgG4-positive clones in affected organs of IgG4-related disease.

Science.gov (United States)

Kakuchi, Yasushi; Yamada, Kazunori; Ito, Kiyoaki; Hara, Satoshi; Fujii, Hiroshi; Yamagishi, Masakazu; Kawano, Mitsuhiro

2016-11-01

We investigated class switch reaction (CSR) in affected organs and evaluated whether the same or genetically related clones exist in IgG4-RD. We studied three patients with IgG4-RD. Total cellular RNA was extracted from salivary glands and peripheral blood and lung tissue. Activation-induced cytidine deaminase (AID) and immunoglobulin heavy chain third complementarity determining region (IgVH-CDR3) of IgM and IgG4 were detected by reverse transcription polymerase chain reaction (RT-PCR). We analyzed the clonal relationship of infiltrating IgG4-positive cells, as compared with IgM. We determined the existence of common clones among organs and patients. AID was expressed in salivary glands of all patients and lung tissue in one. Closely related IgVH-CDR3 sequences in infiltrating IgG4-positive cells were detected in salivary glands and lung tissue. Identical IgVH-CDR3 sequence between IgM and IgG4 in salivary glands was detected in one patient, indicating CSR in salivary glands. Identical IgVH-CDR3 sequences of IgG4-positive cells were detected between salivary glands and peripheral blood in two patients. Four identical sequences of IgVH-CDR3 existed between patients. Interestingly, one of the four sequences was detected in all patients. Our results demonstrate the existence of common antigen(s) shared by patients with IgG4-RD.

Human IgG4: a structural perspective.

Science.gov (United States)

Davies, Anna M; Sutton, Brian J

2015-11-01

IgG4, the least represented human IgG subclass in serum, is an intriguing antibody with unique biological properties, such as the ability to undergo Fab-arm exchange and limit immune complex formation. The lack of effector functions, such as antibody-dependent cell-mediated cytotoxicity and complement-dependent cytotoxicity, is desirable for therapeutic purposes. IgG4 plays a protective role in allergy by acting as a blocking antibody, and inhibiting mast cell degranulation, but a deleterious role in malignant melanoma, by impeding IgG1-mediated anti-tumor immunity. These findings highlight the importance of understanding the interaction between IgG4 and Fcγ receptors. Despite a wealth of structural information for the IgG1 subclass, including complexes with Fcγ receptors, and structures for intact antibodies, high-resolution crystal structures were not reported for IgG4-Fc until recently. Here, we highlight some of the biological properties of human IgG4, and review the recent crystal structures of IgG4-Fc. We discuss the unexpected conformations adopted by functionally important Cγ2 domain loops, and speculate about potential implications for the interaction between IgG4 and FcγRs. © 2015 The Authors. Immunological Reviews Published by John Wiley & Sons Ltd.

Vacuna contra el VPH (HPV Vaccine)

Centers for Disease Control (CDC) Podcasts

2013-07-25

Desde el 2006, hay una vacuna que protege contra los tipos de VPH que causan cáncer con mayor frecuencia. Este podcast habla sobre la importancia de que los padres hablen con los proveedores de atención médica de sus hijos sobre ponerles la vacuna contra el VPH.  Created: 7/25/2013 by MMWR.   Date Released: 11/4/2013.

Identificación de un epítope conformacional en el extremo carboxilo de la proteína MSP-1 de P. Falciparum

Directory of Open Access Journals (Sweden)

Julio C. Calvo

2010-11-01

Full Text Available El fragmento carboxilo terminal, rico en cisteínas, de la proteína 1 de superficie del merozoito (MSP-1 desempeña un papel importante en la invasión del merozoito de la malaria al eritrocito. Anticuerpos contra esta región de MSP-l inhiben la invasión.

Detección de anticuerpos antiplasmodium por ELISA en donantes de sangre

Directory of Open Access Journals (Sweden)

Patricia Olaya de Morales

1982-06-01

Full Text Available La malaria, una enfermedad transmitida por mosquitos del genero anopheles, puede ser inducida a través de transfusiones de sangre infectada con alguna de las especies de Plasmodium que afectan al hombre. Con el objeto de determinar el riesgo potencial de infección inducida por transfusiones, se analizaron durante 9 meses y mediante la técnica de E.L.I.S.A., las muestras de suero tomadas a los donantes de sangre del Hospital Militar Central de Bogotá. El 8.6 por mil de las 3114 muestras analizadas, resultaron positivas para anticuerpos antimaláricos y durante el tiempo del estudio fueron detectados 3 casos de malaria inducida por transfusiones.

Avaliação Laboratorial de Anticorpos Contra o Vírus da Hepatite C em Voluntários Imunizados contra a Hepatite B

Directory of Open Access Journals (Sweden)

Elaine Cristina de Santana Garcia

2015-12-01

Full Text Available Considerando que (1 após a imunização contra o HBV é possível detectarmos níveis séricos de anti-HBc e anti-HBSag, (2 a infecção pelo HBV ocorre, principalmente, através de contato sexual, sendo mais freqüentemente associada com os vírus das hepatites tipos A, B, C e Delta com evolução para doenças hepática crônica e (3 a definição do agente infeccioso responsável pela hepatite C (diagnóstico etiológico é dada através da investigação do marcador sorológico Anti-HCV, este trabalho apresentou como objetivo investigar, através de ensaio de ELISA, a possível reação cruzada de anticorpos contra o vírus da Hepatite C em voluntários imunizados contra a Hepatite B. Assim, neste estudo, selecionamos 20 voluntários (ambos os sexos imunizados contra o vírus da hepatite B e que relataram não serem portadores do vírus da hepatite C. Em amostras de soro, foi realizada, através de ensaio imunoenzimático (ELISA, a pesquisa de anticorpos IgM contra o vírus da hepatite C. A análise laboratorial revelou que todos os voluntários selecionados não foram capazes de produzir anticorpos contra o vírus da hepatite C quando submetidos à imunização contra o vírus da hepatite B. Este estudo mostra que a imunização contra o vírus da hepatite B realizada na Rede Pública de Saúde é, exclusivamente, capaz de produzir resposta imune humoral somente contra este agente viral e não permite a estimulação de anticorpos inespecíficos.

Immunochemical characteristics of IgG4 antibodies

NARCIS (Netherlands)

van der Zee, J. S.; Aalberse, R. C.

1988-01-01

Although a small part of the IgG4 subclass probably can bind to basophils (and mast cells), IgG4 antibodies usually do not behave as anaphylactic antibodies. Therefore, detection of IgG4 antibodies in serum is not a suitable in vitro assay for IgG-S-TS activity. Furthermore, differences between IgG4

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

Directory of Open Access Journals (Sweden)

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.

IgG4 breaking the rules

NARCIS (Netherlands)

Aalberse, Rob C.; Schuurman, Janine

2002-01-01

Immunoglobulin G4 (IgG4) antibodies have been known for some time to be functionally monovalent. Recently, the structural basis for this monovalency has been elucidated: the in vivo exchange of IgG half-molecules (one H-plus one L-chain) among IgG4. This process results in bispecific antibodies that

Procedimientos para la detección e identificación de anticuerpos eritrocitarios

OpenAIRE

Alfonso Valdés , Yalile; Bencomo Hernández, Antonio

2001-01-01

En Inmunohematología se ha desarrollado una amplia gama de procederes de detección e identificación de anticuerpos eritrocitarios in vitro, por lo cual se realiza una revisión de técnicas y métodos empleados con este objetivo, como son el método que utiliza eritrocitos pretratados con enzimas proteolíticas y las técnicas de Polibreno, que utiliza solución de baja fuerza iónica (LISS), la de antiglobulina indirecta, la de aglutinación en gel, la inhibición de la aglutinación, la hemólisis y la...

Estandarización de una prueba de ELISA para detectar anticuerpos IgE en pacientes con equinococosis quistica y su utilidad en el diagnóstico y seguimiento de pacientes tratados con albendazol: reporte preliminar

Directory of Open Access Journals (Sweden)

Herman Vildózola

2012-01-01

Full Text Available Objetivos: Determinar las diluciones y concentraciones optimas de una prueba de ELISA para detectar anticuerpos IgE, así como su sensibilidad, espécificidad y valor predictivo en pacientes con equinococosis quistica. Analizar si los niveles de anticuerpos IgE especificos se correlacionan con la respuesta al tratamiento médico con albendazol en un periodo mayor a un año de finalizado el tratamiento. Diseño: Estudio cuasiexperimental con grupo control. Institución: Instituto de Medicina Tropical Daniel A. Carrión, Facultad de Medicina, UNMSM, Lima, Perú. Material de estudio: Prueba de ELISA para anticuerpo IgE. Intervenciones: Estandarizacion de la prueba de ELISA para anticuerpo IgE y diseño preexperimento con preprueba y posprueba en un solo grupo, para evaluar su valor en el diagnóstico y seguimiento postratamiento de pacientes con quiste hidatidico hepatico tratados con albendazol. Para la estandarizacion de la prueba de ELISA, se utilizó suero de cinco pacientes con diagnóstico clínico de equinococosis quistica, y la sensibilidad y especificidad de la prueba se usó suero de 30 pacientes aparentemente sanos. Para determinar las reacciones cruzadas, se utilizó 16 muestras de suero de pacientes con otras helmintiasis (ascariasis, strongiloidiasis, toxocariosis, trichuriasis, himenolepiasis, cisticercosis y teniasis. Para el diagnóstico y seguimiento postratamiento de equinocococosis quística, se utilizó el suero de 17 pacientes. Principales medidas de resultados: Sensibilidad y especificidad de prueba estandarizada de ELISA para detectar anticuerpos IgE. Resultados: La prueba estandarizada de ELISA para detectar anticuerpos IgE tuvo una sensibilidad de 95,6% y una especificidad de 100%. En los pacientes con quiste hidatídico hepático considerados curados, uniformemente disminuyeron los niveles de anticuerpo tipo IgE hasta la negativización. Se obtuvo elevación de los niveles de IgE en los pacientes que presentaron

Polymyositis with elevated serum IgG4 levels and abundant IgG4+ plasma cell infiltration: A case report and literature review.

Science.gov (United States)

Anan, Ryusuke; Akiyama, Mitsuhiro; Kaneko, Yuko; Kikuchi, Jun; Suzuki, Kazuko; Matsubara, Shiro; Takeuchi, Tsutomu

2017-12-01

Polymyositis (PM) is a type of autoimmune, inflammatory myopathy. IgG4-related disease (IgG4-RD) is a recently recognized disease entity characterized by elevated serum IgG4 levels and IgG4 plasma-cell infiltration of various organs. However, several reports have described cases of other diseases that present with those features, suggesting the importance of careful differential diagnosis. Herein, we report the first case of PM with elevated serum IgG4 levels and IgG4 plasma cells in the muscles, mimicking IgG4-RD.A 73-year-old woman visited our hospital because of proximal muscle weakness of both thighs. Her blood test showed high levels of serum creatinine kinase, aldolase, and IgG4. Magnetic resonance imaging of the thighs showed muscle edema. Needle electromyography showed findings typical of myositis. Histological analysis of her left quadriceps revealed infiltration of IgG4 plasma cells as well as CD8 T cells. Scattered necrotic and regenerating muscle fibers with no specific findings for IgG4-RD (storiform fibrosis and obliterative phlebitis) were typical for PM. We diagnosed her condition as PM and treated her with 40 mg/day of prednisolone that decreased levels of muscle enzymes and improved muscle weakness. Our case indicated that PM could present with high serum IgG4 levels and IgG4 plasma-cell infiltration, mimicking IgG4-RD. Although the mechanism of IgG4 elevation in such PM is unclear, our case highlights the necessity to recognize that high serum IgG4 levels and IgG4 plasma-cell infiltration in organs are not specific for IgG4-RD.

Avaliação da resposta humoral à vacina pneumocócica 7-valente em crianças com Aids Evaluación de la vacuna neumocócica 7-valente en la respuesta humoral de niños con SIDA Evaluation of humoral response to heptavalent pneumococcal conjugate vaccine in HIV-infected children

Directory of Open Access Journals (Sweden)

Isabel de Camargo Costa

2008-10-01

Full Text Available OBJETIVO: A doença pneumocócica invasiva é importante causa de morbi-mortalidade em crianças infectadas pelo HIV. O objetivo do estudo foi avaliar quantitativamente a resposta com anticorpos aos sete sorotipos pneumocócicos da vacina em um grupo de crianças infectadas pelo HIV. MÉTODOS: Estudo realizado com 40 crianças infectadas pelo HIV, com idade entre 2 e 9 anos, em seguimento em ambulatório especializado no município de São Paulo, em 2002-2003. A dosagem de anticorpos IgG contra os polissacarídeos da cápsula pneumocócica foi realizada por meio de ensaio imunoenzimático (ELISA. Os anticorpos foram dosados imediatamente antes e um mês após a aplicação da segunda dose da vacina. Utilizaram-se dois critérios para avaliar a resposta à vacina: títulos de anticorpos >1,3 µg/mL na sorologia pós-imunização e aumento >4 vezes nos títulos da sorologia pós em relação à pré-imunização. RESULTADOS: Para o primeiro critério (>1,3 µg/mL, 26 (65% crianças obtiveram resposta sorológica à vacina, 12 (30% delas apresentaram títulos de IgG pós-imunização em níveis de pelo menos 1,3 µg/mL para todos os sorotipos. Para o segundo critério (incremento >4 vezes nos títulos para quatro sorotipos ou mais, obteve-se resposta sorológica para 15 (37,5% crianças. CONCLUSÕES: A resposta à vacina foi considerada satisfatória, com aumento estatisticamente significante dos títulos geométricos médios pós-vacinais em relação aos pré-vacinais para todos os sorotipos estudados.OBJETIVO: La enfermedad neumocócica es una importante causa de morbi-mortalidad en niños infectados por HIV. El objetivo del estudio fue evaluar cuantitativamente la respuesta de anticuerpos para los siete serotipos neumocócicos de la vacuna en un grupo de niños infectados por HIV. MÉTODOS: El estudio fue realizado con 40 niños infectados por HIV, con edades entre 2 y 9 años, con seguimiento en ambulatorio especializado en el municipio de Sao

Epstein-Barr virus-infected cells in IgG4-related lymphadenopathy with comparison with extranodal IgG4-related disease.

Science.gov (United States)

Takeuchi, Mai; Sato, Yasuharu; Yasui, Hiroshi; Ozawa, Hiroaki; Ohno, Kyotaro; Takata, Katsuyoshi; Gion, Yuka; Orita, Yorihisa; Tachibana, Tomoyasu; Itoh, Tomoo; Asano, Naoko; Nakamura, Shigeo; Swerdlow, Steven H; Yoshino, Tadashi

2014-07-01

IgG4-related lymphadenopathy with increased numbers of Epstein-Barr virus (EBV)-infected cells has been reported but not fully described. We analyzed 31 cases of IgG4-related lymphadenopathy and 24 cases of extranodal IgG4-related diseases for their possible relationship with EBV. Other types of reactive lymph nodes (22) and angioimmunoblastic T-cell lymphoma (AITL) (10) were also studied for comparison. EBV-encoded RNA (EBER) in situ hybridization revealed EBER(+) cells in 18 of 31 cases (58%) of IgG4-related lymphadenopathy. Increased EBER(+) cells were found in only 4 of 22 (18.1%) non-IgG4-related reactive lymphoid hyperplasia in patients of a similar age (P=0.002) and in only 5 of 24 (21%) extranodal IgG4-related biopsies (P=0.006). Interestingly, all patients with EBER(+) progressively transformed germinal center-type IgG4-related lymphadenopathy had systemic lymphadenopathy and/or extranodal involvement. AITL also is associated with EBV, and IgG4-related lymphadenopathy sometimes mimics the morphology of AITL; however, the number of IgG4(+) cells in AITL was significantly less than that in IgG4-related lymphadenopathy (Pdisease; however, there was not a significant difference between the EBER(+) and EBER(-) cases. In conclusion, the presence of increased numbers of EBV-infected cells in IgG4-related lymphadenopathy, compared with other reactive lymphadenopathy or extranodal IgG4-related disease, suggests that there may be a relationship at least between nodal IgG4-related disease and EBV. It is important to avoid overdiagnosing these cases as malignant lymphomas or EBV-related lymphoproliferative disorders.

Frecuencia de anticuerpos anti Trypanozoma cruzi en pacientes portadores de marcapasos de la Clinica San Pedro Claver de Bogotá

Directory of Open Access Journals (Sweden)

Guillermo Mora

2007-12-01

Conclusiones. La prevalencia de anticuerpos anti-T. cruzi en pacientes portadores de marcapaso es alta. La implantación de marcapasos se presentó más tempranamente en el grupo seropositivo. No hay adecuada sospecha clínica ni información al paciente sobre el diagnóstico de la enfermedad de Chagas.

IgG and IgG subclasses antibody responses to rK39 in Leishmania donovani infections

International Nuclear Information System (INIS)

Daifalla, N.S.; El Hassan, A.M.

1998-01-01

Leishmania donovani infection cause a wide spectrum of human diseases ranging from self-healing subclinical infections to severe visceral leishmaniasis, post kal-azar dermal leishmaiasis, and mucosal leishmaiasis. The infection associated with high levels of anti-leishmania antibodies which offer a potential parameter for the serological diagnosis of L. donovani infection replacing the invasive parasitological methods. rK39, a cloned antigen of L. chagasis was reported to have high levels of anti-leishmania antibodies in Sudanese and American visceral leishmaniasis patients. In an assessment of rK39-ELISA in detecting L. donovani infection we found that the antigen detected visceral leishmaniasis, post kala-azar dermal leishmaniasis, and mucosal leismaniasis with the sensitives of 96.6%, 95.91% and 90.91% respectively. The test has the specificity of 96.7%. Further investigation of 25 visceral leishmaniasis patients showed elevated anti-rK39 antibody responses of IgG subclasses with IgG1 and IgG3 significantly higher than IgG4. igG3 showed the highest sensitivity (84.00%) whereas IgG1 showed the highest sensitivity (100%). The dynamics of the serological reactivity to rK39 in l.donovani infections will be discussed in relation to exposure, infection, cure and relapse.(Author)

Establishment of a serum IgG4 cut-off value for the differential diagnosis of IgG4-related disease in Chinese population.

Science.gov (United States)

Li, Ping; Chen, Hua; Deng, Chuiwen; Wu, Ziyan; Lin, Wei; Zeng, Xiaofeng; Zhang, Wen; Zhang, Fengchun; Li, Yongzhe

2016-07-01

This study was performed to better know diagnosis associated with serum IgG4 concentration, and to explore the possibility for development of a serum IgG4 for IgG4-related disease (IgG4-RD) in Chinese populations. We studied retrospectively 497 IgG4 serum subclass measurements from Peking Union Medical College Hospital during the four-year period, including 242 IgG4-RD, 130 other diseases and 125 healthy individuals. Serum IgG4 concentrations were significantly higher in IgG4-RD than in other pathologies (1662.9 ± 3760.9 mg/L, p IgG4 level between other pathologies group and healthy individuals (p = 0.075). Among the 242 IgG4-RD patients analyzed, serum IgG4 concentrations were normal in 46 patients (19.0%). We found 32 patients (24.6%) with elevated serum IgG4 levels among the 130 patients who suffered from other pathologies. There were seven (5.6%) with serum IgG4 over 1350 mg/L in healthy individuals. The ROC curve analysis revealed that the optimal sensitivity and specificity were 80.0% and 88.2%, respectively, at the concentration of 1575 mg/L for Chinese patients. Our study demonstrated that serum IgG4 elevation was not specific of IgG4-RD. Further studies are needed to define the sensibility and specificity of IgG4 values for the diagnosis of IgG4-RD.

Current Concept of IgG4-Related Disease.

Science.gov (United States)

Okazaki, Kazuichi; Umehara, Hisanori

2017-01-01

IgG4-related disease (IgG4-RD) is a fibroinflammatory disease of unknown etiology, which is characterized by a tendency to form tumefactive lesions, increased serum levels of IgG4, and massive infiltration of IgG4-positive plasma cells with storiform fibrosis and/or obliterative phlebitis. Patients with IgG4-RD have frequently multiorgan involvements such as the pancreas, biliary tree, salivary glands, periorbital tissues, kidneys, lungs, lymph nodes, and retroperitoneum. IgG4-RD mainly affects middle-aged to elderly men except for involvement in lachrymal and salivary glands, so-called Mikulicz's disease. The clinical manifestations of IgG4-RD depend on individually involved organs and respond well to steroid, but the prognosis still remains unclear. Some patients develop serious complications such as obstructive jaundice due to hepatic, gallbladder, or pancreatic lesions; hydronephrosis due to retroperitoneal fibrosis; or respiratory symptoms due to pulmonary lesions. Nomenclatures of individual organ manifestation of IgG4-RD have been internationally consented.

Clinical features of IgG4-related rhinosinusitis.

Science.gov (United States)

Hanaoka, Machiko; Kammisawa, Terumi; Koizumi, Satomi; Kuruma, Sawako; Chiba, Kazuro; Kikuyama, Masataka; Shirakura, Satoshi; Sugimoto, Taro; Hishima, Tsunekazu

2017-09-01

IgG4-related disease is a systemic disease that affects various organs of the body. Aim of this study is to elucidate the clinical characteristics of IgG4-related rhinosinusitis. Clinical features, laboratory findings, radiological and endoscopic findings, associated disease, treatment and prognosis were retrospectively examined in 10 patients with IgG4-related rhinosinusitis. The age was 59.1±11.3 years old and male-to-female ratio was 1:1. The chief nasal complaints were hyposmia (n=4), nasal obstruction (n=3), and nothing (n=3). Serum IgG4 levels were elevated in all patients and the value was 740.4±472.4mg/dl. Other IgG4-related diseases were associated in all 10 patients, including IgG4-related sialadenitis (n=6), IgG4-related dacryoadenitis (n=5), and autoimmune pancreatitis (n=5). Imaging findings on CT/MRI were obstruction of the way of elimination (n=10), thickening of the sinus mucous membrane (n=10), and fluid in the sinus (n=6). All of the cases had bilateral findings. Nasal endoscopic findings were chiefly deviated nasal septum (n=5), polyps (n=4), edema of the mucous membrane (n=3). Histologically, abundant infiltration of IgG4 positive plasma cell and lymphocyte and an elevated IgG4+/IgG+ cell ration was detected in all 8 patients and 5 patients, respectively. Endoscopic sinus surgery was performed in 8 patients. Eight patients were treated with steroid therapy for other associated IgG4-related diseases. Symptoms improved in all 6 patients after an initial treatment (endoscopic surgery (n=5) and steroids (n=1)), but one patient suffered relapse. IgG4-related rhinosinusitis is a distinct entity of IgG4-related disease, and is associated in patients with multiple IgG4-related diseases. Copyright © 2017 Medical University of Bialystok. Published by Elsevier B.V. All rights reserved.

Detection of IgG1 and IgG4 subtypes reactive against potato apyrase in schistosomiasis patients

Directory of Open Access Journals (Sweden)

Priscila de Faria-Pinto

2010-07-01

Full Text Available In this paper, we showed for the first time that the conserved domains within Schistosoma mansoni ATP diphosphohydrolase isoforms, shared with potato apyrase, possess epitopes for the IgG1 and IgG4 subtypes, as 24 (80% of the 30 schistosomiasis patients were seropositive for this vegetable protein. The analyses for each patient cured (n = 14 after treatment (AT with praziquantel revealed variable IgG1 and IgG4 reactivity against potato apyrase. Different antigenic epitopes shared between the vegetable and parasite proteins could be involved in susceptibility or resistance to S. mansoni AT with praziquantel and these possibilities should be explored.

IgG4-related kidney disease – an update

Science.gov (United States)

Kawano, Mitsuhiro; Saeki, Takako

2015-01-01

Purpose of review IgG4-related disease (IgG4-RD) is a recently recognized systemic inflammatory disorder that can affect most organs/tissues such as sarcoidosis. The kidney is a frequently affected organ with tubulointerstitial nephritis (TIN), the representative lesion of IgG4-RD. This review focuses on the latest knowledge of IgG4-related kidney disease (IgG4-RKD). Recent findings A wide range of renal manifestations of IgG4-RD, that is TIN, membranous glomerulonephritis (MGN) and other glomerular lesions, and pyelitis, are collectively referred to as IgG4-RKD. Clinically, decreased renal function, or characteristic imaging findings such as multiple low-density lesions on contrast-enhanced computed tomography or diffuse thickening of the renal pelvic wall, are typical presenting features. Although a rapid response to corticosteroid therapy is a very important feature of IgG4-TIN, in cases in which renal function is moderately to severely decreased before therapy, only partial recovery of renal function is obtained. Summary TIN with characteristic imaging findings is a typical manifestation of IgG4-RKD in the interstitium, while MGN is a representative manifestation of the glomerular lesions. Although IgG4 is a central feature of IgG4-RD, the recent discovery of IgG4-negative IgG4-RD raises questions about the causative role of the IgG4 molecule in this context. PMID:25594543

Intrathoracic Manifestations of IgG4-Related Disease

Directory of Open Access Journals (Sweden)

Sian Yik Lim

2016-10-01

Full Text Available Intrathoracic involvement with IgG4-related disease (IgG4-RD is frequently overlooked in IgG4-related disease patients. In this article we review the intrathoracic findings of IgG4-RD which are variable and protean. IgG4-related disease has been reported to affect the lung parenchyma, pleura, mediastinal/hilar lymph nodes, vasculature, and pericardium within the thorax. Mediastinal and hilar lymphadenopathy is the most common intrathoracic manifestation of IgG4-RD. Four main patterns of pulmonary disease have been described, including the solid nodular type, the bronchovascular type, the alveolar interstitial type, and the round shaped ground glass type. When feasible, a biopsy should be obtained to confirm the diagnosis. Most lesions show characteristic pathologic findings of IgG4-RD: dense lymphoplasmacytic infiltrate, storiform fibrosis, and obliterative phlebitis. While this helps establish the diagnosis, the interpretation of pathology findings in the clinical context is key in making an accurate diagnosis. Mimickers of IgG4-RD should be ruled out, before making a diagnosis. The intrathoracic findings of IgG4-RD can be treated effectively with prednisone, but may require additional immunosuppressive therapies, including rituximab.

Comparison of semi-automatized assays for anti-T. gondii IgG detection in low-reactivity serum samples: importance of the results in patient counseling Comparação de ensaios semi-automatizados para pesquisa de IgG anti-T. gondii em amostras de soros de baixa reatividade: importância dos resultados no aconselhamento do paciente

Directory of Open Access Journals (Sweden)

Paulo Guilherme Leser

2003-06-01

Full Text Available Toxoplasmosis is a disease which can cause severe congenital infection and is normally diagnosed by the detection of T. gondii specific antibodies in the serum of infected patients. Several different tests allow to distinguish recent from past infections and to quantify anti-T. gondii specific IgG, and the results can be used as markers for immunity. In the present study, we compare the performance of two different methodologies, the Elfa (bioMérieux S.A and the Meia (Abbott Laboratories in detecting T. gondii specific IgG in low-reactivity sera. Of 76 analyzed samples, three presented discrepant results, being positive in the Abbott AxSYM Toxo IgG assay, and negative in the bioMérieux Vidas Toxo IgG II assay. By using other tests, the three sera were confirmed to be negative. The results are discussed in the context of their importance for patient management, especially during pregnancy.Toxoplasmose, doença conhecida por sua severidade na infecção congênita é geralmente diagnosticada pela demonstração de anticorpos específicos contra antígenos de T. gondii, presentes no soro de indivíduos infectados. Diferentes testes são disponíveis para diferenciar infecção recente de infecção pregressa, para quantificar anticorpos IgG anti-T. gondii nos soros dos pacientes e utilizar os resultados como marcadores de imunidade. Neste trabalho apresentamos os resultados do estudo comparativo de duas tecnologias, Elfa (bioMérieux S.A. e Meia (Abbott Laboratories, para pesquisa de anticorpos IgG anti-T. gondii em amostras de soros de baixa reatividade. De 76 amostras processadas, três apresentaram resultados discrepantes, reagentes para AxSYM Toxo IgG e não-reagentes para Vidas Toxo IgG II. A confirmação dos resultados, feita por bateria de testes, mostrou que todas as três amostras eram não-reagentes. Os resultados são discutidos em sua importância e orientação clínica, principalmente para a paciente gestante.

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.

Concurrent IgG4-related tubulointerstitial nephritis and IgG4 myeloperoxidase-anti-neutrophil cytoplasmic antibody positive crescentic glomerulonephritis: A case report.

Science.gov (United States)

Su, Tao; Yang, Li; Cui, Zhao; Wang, Su-Xia; Zhao, Ming-Hui

2017-05-01

IgG4-related disease (IgG4-RD) is a newly recognized systemic disease. The typical pathological finding in the kidney is abundant IgG4-positive plasma cell infiltration with characteristic storiform fibrosis in the interstitium. Antibodies of the IgG4 subclass have been linked to certain autoimmune diseases including antiproteinase 3 (PR3) anti-neutrophil cytoplasmic antibody (ANCA) of the IgG4 subclass. Here, we report a rare case of kidney injury with concurrent typical IgG4-related tubulointerstitial nephritis and IgG4 subclass of myeloperoxidase (MPO) ANCA-positive necrotizing crescentic glomerulonephritis. A 42-year-old Chinese man presented with repeated epigastric pain, sausage-shaped pancreas observed morphologically in computed tomography, effectiveness of prednisone therapy and was diagnosed with autoimmune pancreatitis. He subsequently developed acute kidney injury. The patient had an elevated serum IgG4, eosinophilia, and positive MPO-ANCA of IgG4-dominant subclass. Renal biopsy revealed necrotizing crescentic nephritis and typical IgG4-related tubulointerstitial nephritis. The patient was treated with a combination of corticosteroids and cyclophosphamide, and a course of rituximab was later added to deplete peripheral B cells. The patient responded well and his renal function improved. This is the first case report of an IgG4-RD with concurrent IgG4-related tubulointerstitial nephritis and IgG4 MPO-ANCA-associated necrotizing crescentic glomerulonephritis. It raises the difficulty in differentiation diagnosis of the two separate diseases that is worthy of further study.

Increase in serum concentrations of IgG2 and IgG4 by selenium supplementation in children with Down's syndrome.

Science.gov (United States)

Annerén, G; Magnusson, C G; Nordvall, S L

1990-01-01

In a previous study on children with Down's syndrome a reduced rate of infections was reported by their parents after the children had received six months' treatment with selenium supplements. In the present study the concentrations of the four IgG subclasses were measured in 29 of these children in samples of serum obtained before and immediately after the period of supplementation and one year after it had finished. Selenium had a significant augmentative effect on the serum concentrations of IgG2 and IgG4, but not of IgG1 and IgG3. This effect was not related to age, as among children over the age of 6 years the serum concentrations of IgG2 and IgG4 had decreased significantly one year after the treatment had been stopped. This study suggests that selenium has an immunoregulatory effect, which might be of importance in both basic research and clinical practice. PMID:2148668

Fc-Glycosylation in Human IgG1 and IgG3 Is Similar for Both Total and Anti-Red-Blood Cell Anti-K Antibodies

Directory of Open Access Journals (Sweden)

Myrthe E. Sonneveld

2018-01-01

Full Text Available After albumin, immunoglobulin G (IgG are the most abundant proteins in human serum, with IgG1 and IgG3 being the most abundant subclasses directed against protein antigens. The quality of the IgG-Fc-glycosylation has important functional consequences, which have been found to be skewed toward low fucosylation in some antigen-specific immune responses. This increases the affinity to IgG1-Fc-receptor (FcγRIIIa/b and thereby directly affects downstream effector functions and disease severity. To date, antigen-specific IgG-glycosylation have not been analyzed for IgG3. Here, we analyzed 30 pregnant women with anti-K alloantibodies from a prospective screening cohort and compared the type of Fc-tail glycosylation of total serum- and antigen-specific IgG1 and IgG3 using mass spectrometry. Total serum IgG1 and IgG3 Fc-glycoprofiles were highly similar. Fc glycosylation of antigen-specific IgG varied greatly between individuals, but correlated significantly with each other for IgG1 and IgG3, except for bisection. However, although the magnitude of changes in fucosylation and galactosylation were similar for both subclasses, this was not the case for sialylation levels, which were significantly higher for both total and anti-K IgG3. We found that the combination of relative IgG1 and IgG3 Fc-glycosylation levels did not improve the prediction of anti-K mediated disease over IgG1 alone. In conclusion, Fc-glycosylation profiles of serum- and antigen-specific IgG1 and IgG3 are highly similar.

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.

IgG4-Associated Cholangitis--A Mimic of PSC

NARCIS (Netherlands)

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 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.

Diagnosis of IgG4-related sclerosing cholangitis

Science.gov (United States)

Nakazawa, Takahiro; Naitoh, Itaru; Hayashi, Kazuki; Miyabe, Katsuyuki; Simizu, Shuya; Joh, Takashi

2013-01-01

IgG4-related sclerosing cholangitis (IgG4-SC) is often associated with autoimmune pancreatitis. However, the diffuse cholangiographic abnormalities observed in IgG4-SC may resemble those observed in primary sclerosing cholangitis (PSC), and the presence of segmental stenosis suggests cholangiocarcinoma (CC). IgG4-SC responds well to steroid therapy, whereas PSC is only effectively treated with liver transplantation and CC requires surgical intervention. Since IgG4-SC was first described, it has become a third distinct clinical entity of sclerosing cholangitis. The aim of this review was to introduce the diagnostic methods for IgG4-SC. IgG4-SC should be carefully diagnosed based on a combination of characteristic clinical, serological, morphological, and histopathological features after cholangiographic classification and targeting of a disease for differential diagnosis. When intrapancreatic stenosis is detected, pancreatic cancer or CC should be ruled out. If multiple intrahepatic stenoses are evident, PSC should be distinguished on the basis of cholangiographic findings and liver biopsy with IgG4 immunostaining. Associated inflammatory bowel disease is suggestive of PSC. If stenosis is demonstrated in the hepatic hilar region, CC should be discriminated by ultrasonography, intraductal ultrasonography, bile duct biopsy, and a higher cutoff serum IgG4 level of 182 mg/dL. PMID:24282356

Papel de los anticuerpos antiplaquetarios en la infección viral: una revisión sistemática de la literatura

Directory of Open Access Journals (Sweden)

Yenny M. Montenegro-Medina

2011-04-01

Conclusiones. Aunque la aparición de anticuerpos antiplaquetarios no se considera el único mecanismo que explica la trombocitopenia desarrollada en las infecciones virales mencionadas, de acuerdo con la literatura científica disponible, su presencia se asocia con la gravedad de la trombocitopenia y con potenciales implicaciones clínicas en los pacientes.

IgG4-related Disease of the Genitourinary Tract

Directory of Open Access Journals (Sweden)

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

IgG4 antibodies in Egyptian patients with schistosomiasis

NARCIS (Netherlands)

Iskander, R.; Das, P. K.; Aalberse, R. C.

1981-01-01

Serum immunoglobulins were determined in 40 Egyptian patients with schistosomiasis. In addition to the well-established elevation in total IgE, a striking imbalance in the IgG subclass levels was found: IgG3 and IgG4 levels were markedly elevated, whereas IgG2 levels were normal. The IgG4 level did

IgG4-gerelateerde ziekte

NARCIS (Netherlands)

Maillette de Buy Wenniger, Lucas J.; Doorenspleet, Marieke E.; Verheij, Joanne; de Vries, Niek; Beuers, Ulrich

2013-01-01

The diagnosis IgG4-related disease (IgG4-RD) is often difficult to make. The clinical spectrum is diverse, with a variety of organ systems that may be affected simultaneously or sequentially. Patients often present with symptoms that mimic a malignant disease, for example, symptoms compatible with a

IgG4-Associated Cholangitis Can Mimic Hilar Cholangiocarcinoma.

Science.gov (United States)

Zaydfudim, Victor M; Wang, Andrew Y; de Lange, Eduard E; Zhao, Zimin; Moskaluk, Christopher A; Bauer, Todd W; Adams, Reid B

2015-07-01

IgG4-associated cholangitis can mimic hilar cholangiocarcinoma. Previously reported patients with IgG4-associated cholangitis mimicking cholangiocarcinoma had elevated serum IgG4 levels and long-segment biliary strictures. However, in the absence of other diagnostic criteria for malignancy, IgG4-associated cholangitis should remain a consideration among patients with normal serum IgG4 and a hilar mass suspicious for cholangiocarcinoma. The presence of a hilar mass and a malignant-appearing biliary stricture in two patients with normal serum IgG4 prompted further evaluation and subsequent concomitant liver and bile duct resection and reconstruction. The diagnosis of IgG4-associated cholangitis was established during the pathologic evaluation of the resected specimens. IgG4-associated cholangitis is a known imitator of hilar cholangiocarcinoma and should be considered in the differential diagnosis even among serologically IgG4-negative patients with a hilar mass prior to operative resection.

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

Directory of Open Access Journals (Sweden)

Seokhwi Kim

2016-07-01

Full Text Available 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.

A three-layer immunoradiometric assay for determination of IgG subclass antibodies in Human Sera (''IgG subclass RAST'')

International Nuclear Information System (INIS)

Djurup, R.; Soendergaard, I.; Weeke, B.; University of Copenhagen, Denmark); Magnusson, C.G.M.

1984-01-01

We report the development of a three-layer immunoradiometric assay (TIRA) for measurement of IgG antibodies of all four subclasses in human sera. The first layer consists of diluted human serum, the second layer is monoclonal mouse antibodies to human IgG subclasses, and the third layer is 125 I-labelled rabbit anti-mouse IgG. Monoclonal anti-IgGI, anti-IgG3 and anti-IgG4 reacted only with their complementary IgG subclass, whereas the anti-IgG2 showed slight cross-reactivity to immunoglobins of other subclasses and classes and to light chain proteins. The observed cross-reactivity was found to be without importance, when the TIRA was applied to measurement of IgG subclass antibodies. Equipotency was established by use of appropriate dilutions of the monoclonal antibodies, and the assay was calibrated by use of human reference serum. The TIRA therefore permits reliable inter-individual and intra-individual comparisons of the IgG antibody response in all four subclasses. Non-specific binding obtained with pooled normal human serum was below 0.33%. Inter-assay coefficient of variation was between 18 and 27%. The TIRA was applied to measurement of IgG subclass antibodies to timothy grass pollen in sera from grass pollen allergies undergoing immunotherapy. (author)

ASOCIACIÓN SEROLÓGICA DE LA RINONEUMONITIS VIRAL EQUINA Y LA ANEMIA INFECCIOSA EQUINA

Directory of Open Access Journals (Sweden)

Albeiro López-Herrera

2008-04-01

Full Text Available Objetivo. Determinar el nivel de asociación serológica entre los herpesvirus equinos tipos 1 y 4 (HVE-1 y HVE-4 causantes de la rinoneumonitis equina y el virus de la anemia infecciosa equina (VAIE en caballos de trabajo provenientes de 5 municipios del Meta. Materiales y métodos. Se realizó una encuesta serológica transversal en 68 equinos provenientes de los municipios de San Martín, Guamal, Restrepo, Cumaral y Paratebueno. Para la evaluación de los anticuerpos contra los HVE-1 y HVE-4, se utilizó un ELISA indirecto para detectar la presencia de anticuerpos dirigidos contra la glicoproteína G del HVE-1 y HVE-4 (Svanovir ™ EHV1/EHV4-Ab ELISA; para el diagnóstico de anticuerpos contra el VAIE se utilizó la prueba de inmunodifusión en agar de gel de Coggins. Resultados. No se encontraron reactores al HVE-1; sin embargo, el porcentaje de seropositividad fue de 94.12% (64/68 y 13.2%(9/68 para HVE-4 y VAIE respectivamente. El porcentaje de animales coinfectados HVE-4 y AIE fue 13.23% (9/68. Cuando se discriminaron los resultados por Municipio se encontró un 27.9% (19/68 de reactividad en el municipio de Restrepo, 26.5% (18/68 en Cumaral, 14.7% (10/68 en Paratebueno, 14.7% (10/68 en Guamal, y 10.3% (7/68 en San Martin. El porcentaje de reactores por municipio al VAIE fue Cumaral 5.88% (4/68, Restrepo 4.4% (3/68, Guamal 1.47%(1/68 y San Martín 1.47% (1/68. Conclusión. El alto porcentaje de coinfección entre HVE-4 y VAIE sugiere un efecto importante en la interacción, pues el efecto inmunosupresor del VAIE podría facilitar la reactivación del estado latente del HVE-4.

The autoimmune IgG4 -associated endocrine pathology

Directory of Open Access Journals (Sweden)

Marina Yu. Yukina

2017-11-01

Full Text Available Immunoglobulin G4-associated diseases (IgG4-AD arethe group of chronic progressive autoimmune fibro-inflammatory pathology of various organs and tissues, characterized by their enlargement and abundant infiltration of immunoglobulin G4-positive plasma cells, as well as an increase in the level of serum immunoglobulin G4 (IgG4.In most patients, the disease is characterized by a mild course.However, there is evidence of a high incidence of malignancies in patients with IgG4-AD.Among endocrine IgG4-associated pathologies, pancreatitis with outcome in diabetes mellitus, hypophysitis and thyroiditis are described. Laboratory examination usually reveals an increased level of IgG4. However, the concentration of IgG4 could not be used as the only diagnostic criterion.The possibility of plasmablastsdetermining as a marker of the disease is discussed.Among the imaging techniques CT, MRI and 18F-FDG-PET/CT are used.However, the most informative method of diagnosis is biopsy. Randomized clinical trials to determine clear recommendations for the treatment of IgG4-AD were not conducted.In most cases, glucocorticoids are prescribed, and immunosuppressive therapy is sometimes used.According to the results of recent studies, the genetically engineered drug rituximab is relatively effective in inducing remission of the disease.Given the high recurrence rate and the risk of malignancy, patients with IgG4-AD require careful long-term follow-up. Thus, the review describes the clinical manifestations of IgG4-AD, examines the possibilities of their diagnosis and presents the existing methods of treatment.However, given the fact that IgG4-AD became a separate group of autoimmune pathology less than 20 years ago, there are insufficient data on these diseases. Researches related to epidemiology, pathophysiology, diagnosis and effective treatment of IgG4-AD are actual.

IgG4-related disease in autoimmune lymphoproliferative syndrome.

Science.gov (United States)

van de Ven, Annick A J M; Seidl, Maximilian; Drendel, Vanessa; Schmitt-Graeff, Annette; Voll, Reinhard E; Rensing-Ehl, Anne; Speckmann, Carsten; Ehl, Stephan; Warnatz, Klaus; Kollert, Florian

2017-07-01

A patient with autoimmune lymphoproliferative disorder (ALPS) developed IgG4-related disease. In retrospect, he had high levels of serum IgG4 for several years prior to presenting with IgG4-related pancreatitis. These high IgG4 levels were masked by hypergammaglobulinemia, a common feature of ALPS. We next screened 18 ALPS patients; four of them displayed increased levels of IgG4. Hence, IgG4-related disease should be considered in ALPS patients, especially in those manifesting lymphocytic organ infiltration or excessive hypergammaglobulinaemia. Screening of IgG4-related disease patients for ALPS-associated mutations would provide further information on whether this disease could be a late-onset atypical presentation of ALPS. Copyright © 2017 Elsevier Inc. All rights reserved.

Descripción de un inmunoensayo enzimático que reconoce anticuerpos anti-factor VIII/von Willebrand obtenidos a partir de hibridomas múridos Description of an enzime immunoassay that recognizes anti-factor VIII/von Willebrand antibodies obtained from murine hybridomas

Directory of Open Access Journals (Sweden)

Renée González Sampedro

1999-04-01

Full Text Available Se describe un inmunoensayo enzimático (ELISA que detecta anticuerpos anti-Factor-VIII/von Willebrand (FVIII/vW, con una relación de enlace > 5, que permite reconocer dichos anticuerpos tempranamente en los cultivos de hibridomas múridos. Para la adsorción de las placas del inmunoensayo se utilizaron preparados semipurificados de FVIII/vW obtenidos en Cuba. Se inmunizaron ratones Balb/c con la finalidad de generar los anticuerpos monoclonales detectados por este ELISA. Se obtuvo un clon con crecimiento estable y varios subclones positivos por el ELISA con actividad biológica específica de anticuerpos inhibidores de FVIIIAn enzime immunoassay (ELISA that detects anti-Factor VIII/von Willebrand (FVIII/vw antibodies with a binding relationship > 5 that allows the early recognition of such antibodies in the cultures of murine hybridomas is described. Semipurified preparations of FVIII/vw obtained in Cuba were used for the adsorption of the immunoassay plates. Balb/c mice were immunized in order to generate the monoclonal antibodies detected by this ELISA. A clone with stable growth and several positive subclones were obtained by ELISA with specific biological activity of FVIII-inhibiting antibodies

The Histopathology of IgG4-Related Disease.

Science.gov (United States)

Avincsal, Mehmet Ozgur; Zen, Yoh

2017-01-01

IgG4-related disease is a multi-organ immune-mediated chronic fibroinflammatory condition characterized by elevated serum IgG4 concentrations, tumefaction, and tissue infiltration by IgG4-positive plasma cells. The exact etiology of IgG4-related disease remains unclear with no known role of the IgG4 molecule itself being identified. Although the pancreas and salivary glands are the main organs affected, the involvement of other organs has also been reported. This multi-organ disease mimics a large number of malignant, infectious, and inflammatory disorders; therefore, a prompt differential diagnosis is important for selecting the right therapeutic strategy. Early steroid therapy assists in preventing tissue fibrosis, parenchymal extinction, and severe functional impairments in the affected organs. The definitive and prompt diagnosis of IgG4-related disease requires both histopathological confirmation and clinicopathological correlations. A histopathological examination is mandatory to exclude neoplastic or inflammatory conditions that mimic IgG4-related disease. The histological changes that occur are basically similar in any organ manifestation, with several site-specific findings being recognized. This chapter summarizes general rules for the pathological examination of IgG4-related disease, as well as the histopathological features and differential diagnoses of major organ manifestations.

IgG4 subclass antibodies impair antitumor immunity in melanoma

Science.gov (United States)

Karagiannis, Panagiotis; Gilbert, Amy E.; Josephs, Debra H.; Ali, Niwa; Dodev, Tihomir; Saul, Louise; Correa, Isabel; Roberts, Luke; Beddowes, Emma; Koers, Alexander; Hobbs, Carl; Ferreira, Silvia; Geh, Jenny L.C.; Healy, Ciaran; Harries, Mark; Acland, Katharine M.; Blower, Philip J.; Mitchell, Tracey; Fear, David J.; Spicer, James F.; Lacy, Katie E.; Nestle, Frank O.; Karagiannis, Sophia N.

2013-01-01

Host-induced antibodies and their contributions to cancer inflammation are largely unexplored. IgG4 subclass antibodies are present in IL-10–driven Th2 immune responses in some inflammatory conditions. Since Th2-biased inflammation is a hallmark of tumor microenvironments, we investigated the presence and functional implications of IgG4 in malignant melanoma. Consistent with Th2 inflammation, CD22+ B cells and IgG4+-infiltrating cells accumulated in tumors, and IL-10, IL-4, and tumor-reactive IgG4 were expressed in situ. When compared with B cells from patient lymph nodes and blood, tumor-associated B cells were polarized to produce IgG4. Secreted B cells increased VEGF and IgG4, and tumor cells enhanced IL-10 secretion in cocultures. Unlike IgG1, an engineered tumor antigen-specific IgG4 was ineffective in triggering effector cell–mediated tumor killing in vitro. Antigen-specific and nonspecific IgG4 inhibited IgG1-mediated tumoricidal functions. IgG4 blockade was mediated through reduction of FcγRI activation. Additionally, IgG4 significantly impaired the potency of tumoricidal IgG1 in a human melanoma xenograft mouse model. Furthermore, serum IgG4 was inversely correlated with patient survival. These findings suggest that IgG4 promoted by tumor-induced Th2-biased inflammation may restrict effector cell functions against tumors, providing a previously unexplored aspect of tumor-induced immune escape and a basis for biomarker development and patient-specific therapeutic approaches. PMID:23454746

Performance Evaluation of the VIDAS® Measles IgG Assay and Its Diagnostic Value for Measuring IgG Antibody Avidity in Measles Virus Infection

Science.gov (United States)

Dina, Julia; Creveuil, Christian; Gouarin, Stephanie; Viron, Florent; Hebert, Amelie; Freymuth, Francois; Vabret, Astrid

2016-01-01

The objective of this study is primarily to compare the performance of the VIDAS® Measles immunoglobulin (Ig)G assay to that of two other serological assays using an immunoassay technique, Enzygnost® Anti-measles Virus/IgG (Siemens) and Measles IgG CAPTURE EIA® (Microimmune). The sensitivity and the agreement of the VIDAS® Measles IgG assay compared to the Enzygnost® Anti-measles Virus/IgG assay and the Measles IgG CAPTURE EIA® assay are 100%, 97.2% and 99.0%, 98.4%, respectively. The very low number of negative sera for IgG antibodies does not allow calculation of specificity. As a secondary objective, we have evaluated the ability of the VIDAS® Measles IgG assay to measure anti-measles virus IgG antibody avidity with the help of the VIDAS® CMV IgG Avidity reagent, using 76 sera from subjects with measles and 238 other sera. Different groups of populations were analyzed. In the primary infection measles group, the mean IgG avidity index was 0.16 (range of 0.07 to 0.93) compared to 0.79 (range of 0.25 to 1) in the serum group positive for IgG antibodies and negative for IgM. These data allow to define a weak anti-measles virus IgG antibody avidity as an avidity index (AI) 0.6. The VIDAS® Measles IgG assay has a performance equivalent to that of other available products. Its use, individual and quick, is well adapted to testing for anti-measles immunity in exposed subjects. PMID:27556477

IgG4-Related Disease of Bilateral Temporal Bones.

Science.gov (United States)

Li, Lilun; Ward, Bryan; Cocks, Margaret; Kheradmand, Amir; Francis, Howard W

2017-03-01

IgG4-related disease (IgG4-RD) is an idiopathic inflammatory condition that causes pseudotumor formation in single or multiple organs, including those of the head and neck. Temporal bone involvement is rare, with only 3 cases of unilateral temporal bone IgG4-RD described in the literature. We report the first known case of IgG4-RD of bilateral temporal bones and describe its clinical presentation, diagnosis, and treatment. The patient was a 52-year-old man with latent tuberculosis (TB) who presented with a 10-year history of bilateral profound hearing loss and vestibular dysfunction. Computed tomography and magnetic resonance imaging demonstrated bilateral labyrinthine destruction with invasion of the posterior fossa. Immunoglobulin level testing showed elevated total serum IgG levels with normal IgG4 levels. Bilateral mastoidectomies were performed, with biopsy samples demonstrating IgG4 staining with IgG4-positive plasma cells up to 40/HPF (high power field) on the right and 20/HPF on the left, consistent with bilateral IgG4-RD. IgG4-RD of bilateral temporal bones presents with chronic and progressive bilateral hearing loss and vestibular dysfunction. Clinical presentation and radiologic findings are nonspecific, and definitive diagnosis must be made with histopathology and immunostaining. Corticosteroids are therapeutic, but surgical resection may be necessary for temporal bone IgG4-RD to improve long-term remission.

Riedel's thyroiditis association with IgG4-related disease.

Science.gov (United States)

Stan, Marius N; Sonawane, Vikram; Sebo, Thomas J; Thapa, Prabin; Bahn, Rebecca S

2017-03-01

IgG4-positive (+) plasma cells have been reported in both Riedel's thyroiditis (RT) and Hashimoto's thyroiditis (HT). These cells are the hallmark of IgG4-related disease (IgG4-RD). We sought to determine whether RT is part of IgG4-RD spectrum. This was a case-control study performed at a tertiary medical centre. We included RT cases from the period 1958 to 2008 that had sufficient paraffin-embedded tissue for IgG4 immunostaining. Controls were patients with HT, age and gender matched, with similar pathology criteria. The main outcome measures were the intensity of the IgG4 staining and the clinical and histological correlates with IgG4-RD. Six pairs of RT and HT were analysed. The mean age was 44·7 years. In both groups, 5/6 cases had positive IgG4 staining. The mean number of IgG4 + cells/ HPF, normalized to the degree of inflammation, was 3·2 ± 3·0 SD (RT) vs 0·9 ± 0·7 (HT), P = 0·15, for fibrotic areas and 2·1 ± 2·3 SD vs 1·0 ± 0·8 (P = 0·39) for areas with lymphoid aggregates. We found the number of IgG4 +  cells in RT to be inversely correlated with the duration of disease (P = 0·046). Three RT cases had associated comorbidities from the IgG4-RD spectrum while none of the HT cases had such conditions. Riedel's thyroiditis is a component of IgG4-RD with the density of the IgG4 +  lymphocytic infiltrate being time dependent. In this small study, we did not identify differences in IgG4 infiltration between RT and HT, minimizing the utility of this marker in RT diagnosis. © 2016 John Wiley & Sons Ltd.

Pathomorphological characteristic of IgG4-related diseases

Directory of Open Access Journals (Sweden)

O. O. Dyadyk

2016-08-01

Full Text Available IgG4-related diseases are a relatively new group of diseases of unknown etiology which are characterized by the development of fibrosis of organs with the presence of big amounts of IgG4-positive plasma-cells in the area of the lesions and increased levels of IgG4 in serum. The organs that may be affected are pancreas, salivary gland, and others, clinical cases of kidney damage are described as well. Renal involvement in IgG4-related diseases most often occurs on the type of tubulointerstitial nephritis, with the further development of acute or chronic kidney injury. The clinic may be represented by the pseudotumor of kidney, renal tissue heterogeneity on the results of CT-studies; acute or chronic renal disease; combination with other organ damage (autoimmune pancreatitis, sclerosing cholangitis, sclerosing lymphoplasmacytic cholecystitis, colitis, sialadenitis, retroperitoneal fibrosis, etc.. Laboratory findings include an increased level of IgG4 in the blood serum, hypocomplementemia, eosinophilia. Histologically, there is interstitial inflammation with many plasma cells, interstitial fibrosis, tubular atrophy, thickening of the tubular basement membrane, some cases are a type of membranous glomerulonephritis. The aim of the study is to identify the patients with IgG4-related diseases with renal impairment and widening the pathological database of such patients with renal impairment to determine the classification criteria of this pathological condition. Materials and methods will include the deceased kidney screening, screening of patients with autoimmune and allergic diseases, nephrological patients screening with the lifetime biopsy (in some cases – repeat biopsy with chronic or acute kidney impairment. There will be clinical and pathological comparison in kidney damage and other diseases with the development of criteria for the classification of lesions in the presence of IgG4-positive substrates and further development of practical

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

Directory of Open Access Journals (Sweden)

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.

Bactericide serum assay to assess the immune response induced by meningococcal and cholera vaccines

Directory of Open Access Journals (Sweden)

Bárbara Cedré

2012-12-01

Full Text Available La susceptibilidad al sistema bactericida del suero es una característica de las bacterias gramnegativas. Existen muchos ejemplos en las enterobacterias, de hecho cualquier procariote que presente una membrana lipídica pudiera ser potencialmente susceptible a la lisis mediada por anticuerpos dependiente del complemento, aunque existen cepas que muestran resistencia al sistema bacteriolítico. Estas son frecuentemente aisladas como agente causal de infecciones que involucran daño tisular, lo que indica que la resistencia a la actividad lítica del suero es determinante de la virulencia en algunas infecciones debido a bacterias gramnegativas. Para algunas enfermedades causadas por estas bacterias la vacunación constituye la medida de prevención más efectiva, como es el caso del cólera y la enfermedad meningocócica. La inducción de anticuerpos con capacidad lítica, producto de la vacunación, se considera en muchos casos el mejor correlato con la protección y se estima que individuos que desarrollan anticuerpos bactericidas, ya sea por una infección clínica o por la vacunación, están protegidos contra la infección o la enfermedad. De ahí que el ensayo bactericida del suero sea la prueba de oro para evaluar la eficacia de muchas vacunas. Ensayos clínicos llevados a cabo con vacunas contra los serogrupos A, B, C, Y y W 135 de N. meningitidis y con vacunas de cólera, ya sean vivas atenuadas o inactivadas, han demostrado la inducción de anticuerpos con actividad lítica que luego han correlacionado con la protección en ensayos de eficacia o frente a un reto experimental. Por lo que resulta imprescindible la estandarización y validación de estos ensayos para su empleo como criterio de inmunogenicidad en el desarrollo de estas vacunas.

In vitro study of protein release from AFCo1 and implications in mucosal immunisation

Directory of Open Access Journals (Sweden)

José Raúl Dopico

2012-04-01

Full Text Available Los anticuerpos aviares (IgY presentan algunas ventajas con relación a los anticuerpos IgG de mamíferos, debido a su fácil obtención y purificación y su bajo costo de producción. El objetivo de este trabajo fue estudiar la factibilidad de acoplar anticuerpos IgY a partículas de poliestireno y evaluar su desempeño en ensayos de látex-aglutinación en lámina. Para este propósito se utilizó como modelo la detección del antígeno de superficie de la hepatitis B (HBsAg. Gallinas Leghorn se inmunizaron con el ingrediente farmacéutico activo que se utiliza en la elaboración de la vacuna recombinante cubana Heberbiovac-HB. Los anticuerpos obtenidos se purificaron y emplearon en la preparación de reactivos de látex-aglutinación (0,8 µm para la detección del HBsAg, los cuales se evaluaron con 50 muestras de suero frente a un reactivo comercial similar. Los resultados se evaluaron de satisfactorios. Se demostró la factibilidad de acoplar anticuerpos aviares a partículas de látex y se abre una perspectiva al empleo de este tipo de ensayo para el diagnóstico rápido de diversas enfermedades.

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.

IgG4-related Disease and the Liver.

Science.gov (United States)

Chen, Jonathan H; Deshpande, Vikram

2017-06-01

Pathologists are likely to encounter IgG4-related disease in several organ systems. This article focuses on helping pathologists diagnose IgG4-related disease in the hepatobiliary system. Missing the diagnosis can result in unnecessary organ damage and/or unnecessary surgical and cancer therapy. In the liver, tumefactive lesion(s) involving the bile ducts with storiform fibrosis and an IgG4-enriched lymphoplasmacytic infiltrate are highly concerning for IgG4-related disease. The recent identification of oligoclonal populations of T cells and B cells in IgG4-related disease may lead to molecular tests, new therapeutics, and a greater mechanistic understanding of the disease. Copyright © 2017 Elsevier Inc. All rights reserved.

Fibrosis pulmonar asociada a vasculitis con anticuerpos anticitoplasmáticos positivos

Directory of Open Access Journals (Sweden)

Marcelo Fernández Casares

2012-08-01

Full Text Available Las complicaciones pulmonares más conocidas de las vasculitis con anticuerpos anticitoplasmáticos de los neutrófilos (ANCA positivos (VAA, son la hemorragia alveolar, los granulomas y la estenosis de la vía aérea. En los últimos años han aparecido algunos informes aislados que muestran la asociación con fibrosis pulmonar (FP, sugiriendo que ésta sería otra complicación de las VAA. En este trabajo informamos dos casos con dicha asociación describiendo sus características clínicas, tomográficas e inmunológicas. Dado que en la asociación de FP y VAA notificada en los últimos años, la FP puede ser su primera manifestación, podría ser necesaria la búsqueda de ANCA en pacientes con FP, como causa de la misma y por el posible desarrollo posterior de vasculitis.

IgG4-related sialadenitis and Sjögren's syndrome.

Science.gov (United States)

Fragoulis, G E; Zampeli, E; Moutsopoulos, H M

2017-03-01

IgG4-related disease (IgG4-RD) has emerged as a new entity in the last decade. It comprises numerous conditions previously thought to be unrelated. Macroscopically, these diseases cause diffuse organ swelling and formation of pseudotumorous masses. Histopathologically, they are characterized by a lymphoplasmacytic infiltrate with increased IgG4+ plasma cells and storiform fibrosis. Despite rapid progress within the last years, our knowledge on these conditions is still fragmented. To date, more than forty organs have been reported to be included in IgG4-RD, and salivary gland involvement is amongst the most common organs affected [IgG4-related sialadenitis (IgG4-RS)]. Interestingly, IgG4-RS shares commonalities with Sjögren's syndrome (SS), like glandular enlargement, sicca symptoms, arthralgias, hypergammaglobulinemia, hypocomplementemia, and circulating antinuclear antibodies. Nonetheless, they differ in that the incidence of anti-Ro and anti-La reactivity is not frequently found in patients with IgG4-RS, their salivary glands are infiltrated by a large number of IgG4+ plasma cells and IgG4-RS symptoms respond promptly to steroids. The aim of this review was to describe the clinical, serological, histopathological and pathophysiological aspects of IgG4-RS in the context of IgG4-RD and highlight the differences between IgG4-RS and SS. © 2016 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

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.

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

Directory of Open Access Journals (Sweden)

Yuliana Gallo García

2012-01-01

Full Text Available 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 obtention of antibodies detecting the genotype III of PVY is reported. This genotype

IgG4-Related Perineural Disease

Directory of Open Access Journals (Sweden)

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.

Seroprevalencia de babesiosis bovina en la hacienda Vegas de la Clara, Gómez Plata (Antioquia, 2008

Directory of Open Access Journals (Sweden)

Richard Zapata Salas

2011-06-01

Full Text Available La babesiosis es una enfermedad del ganado bovino transmitida por la garrapata Rhipicephalus (Boophilus microplus y causada por los parásitos protozoarios Babesia bovis y B. bigemina. Una zona se considera epizootiológicamente estable frente a Babesia spp, cuando el 75% de los bovinos entre las edades de 3 a 9 meses son serorreactivos (IgG frente a Babesia bovis y Babesia bigemina y no hay evidencia de signos clínicos. El objetivo de esta investigación fue determinar la seroprevalencia de Babesia bovis y Babesia bigemina en el ganado bovino de la hacienda Vegas de la Clara (Universidad de Antioquia, Gómez Plata, Antioquia, por medio de inmunofluorescencia indirecta. Se diseñó un estudio descriptivo prospectivo con análisis de corte transversal. Fue evaluada toda la población bovina de la hacienda Vegas de la Clara (n = 118. Las muestras fueron evaluadas por inmunofluorescencia indirecta para la detección de anticuerpos tipo IgG específicos contra Babesia bovis y B. bigemina. La serorreactividad obtenida en los bovinos evaluados, para al menos una especie de Babesia fue del 89,8%, para Babesia bovis del 83,8%, mientras que para B. bigemina del 61%. Se obtuvo una relación estadísticamente significativa entre la serorreactividad para B. bigemina y la frecuencia del tratamiento garrapaticida. La serorreactividad indica estabilidad enzoótica en el hato para B. bovis, mientras que para B. bigemina se encontró que la frecuencia del tratamiento garrapaticida interrumpe su ciclo de transmisión.

Estimation of polyclonal IgG4 hybrids in normal human serum.

Science.gov (United States)

Young, Elizabeth; Lock, Emma; Ward, Douglas G; Cook, Alexander; Harding, Stephen; Wallis, Gregg L F

2014-07-01

The in vivo or in vitro formation of IgG4 hybrid molecules, wherein the immunoglobulins have exchanged half molecules, has previously been reported under experimental conditions. Here we estimate the incidence of polyclonal IgG4 hybrids in normal human serum and comment on the existence of IgG4 molecules with different immunoglobulin light chains. Polyclonal IgG4 was purified from pooled or individual donor human sera and sequentially fractionated using light-chain affinity and size exclusion chromatography. Fractions were analysed by SDS-PAGE, immunoblotting, ELISA, immunodiffusion and matrix-assisted laser-desorption mass spectrometry. Polyclonal IgG4 purified from normal serum contained IgG4κ, IgG4λ and IgG4κ/λ molecules. Size exclusion chromatography showed that IgG4 was principally present in monomeric form (150 000 MW). SDS-PAGE, immunoblotting and ELISA showed the purity of the three IgG4 samples. Immunodiffusion, light-chain sandwich ELISA and mass spectrometry demonstrated that both κ and λ light chains were present on only the IgG4κ/λ molecules. The amounts of IgG4κ/λ hybrid molecules ranged from 21 to 33% from the five sera analysed. Based on the molecular weight these molecules were formed of two IgG4 heavy chains plus one κ and one λ light chain. Polyclonal IgG (IgG4-depleted) was similarly fractionated according to light-chain specificity. No evidence of hybrid IgG κ/λ antibodies was observed. These results indicate that hybrid IgG4κ/λ antibodies compose a substantial portion of IgG4 from normal human serum. © 2014 John Wiley & Sons Ltd.

IgG4-associated sclerosing cholangitis masquerading as hilar cholangiocarcinoma.

Science.gov (United States)

Yadav, Kamal Sunder; Sali, Priyanka Akhilesh; Mansukhani, Verushka M; Shah, Rajiv; Jagannath, P

2016-07-01

IgG4-sclerosing cholangitis (IgG4-SC) commonly presents with type 1 autoimmune pancreatitis. Isolated IgG4-SC is rare. Differentiating IgG4-SC from cholangiocarcinoma preoperatively is challenging due to overlapping radio-clinical manifestations and difficult preoperative histology. We present three cases preoperatively diagnosed and surgically treated as hilar cholangiocarcinoma. First and second cases presented with cholangiocarcinoma with portal vein involvement and third with a malignant-appearing hilar stricture. On histopathology, IgG4-SC was diagnosed in the first two cases. Third patient had raised serum IgG4, and histopathology was inconclusive for IgG4-SC and negative for malignancy. However, she responded to steroid therapy.

Serologic aspects of IgG4 antibodies. II. IgG4 antibodies form small, nonprecipitating immune complexes due to functional monovalency

NARCIS (Netherlands)

van der Zee, J. S.; van Swieten, P.; Aalberse, R. C.

1986-01-01

Human IgG4 antibodies directed against phospholipase A, the P1 antigen from Dermatophagoïdes pteronyssinus extracts, and cat albumin were found unable to cross-link antigen. Previously, it was demonstrated that IgG4 antibodies, in contrast to IgG1 antibodies, did not cross-link Sepharose-bound

Rendimiento diagnóstico del Western Blot para detectar simultáneamente anticuerpos en pacientes con cisticercosis, hidatidosis y fascioliasis humana

Directory of Open Access Journals (Sweden)

Kelly Davelois

Full Text Available Objetivo. Determinar el rendimiento diagnóstico de la técnica de Western Blot para detectar simultáneamente anticuerpos en pacientes con cisticercosis, hidatidosis y fascioliasis humana. Materiales y métodos. Estudio transversal de evaluación de prueba diagnóstica. Se obtuvieron los antígenos de excreción-secreción de las larvas de Taenia solium, quistes de Echinococcus granulosus; y la forma adulta de Fasciola hepática; que luego fueron separados electroforéticamente en geles de poliacrilamida individuales, transferidos y fijados a una membrana de nitrocelulosa para ser enfrentados con sueros de pacientes con las tres parasitosis. La sensibilidad de la técnica se evaluó empleando 300 sueros individuales, 60 pools de dos parasitosis y 20 pools de tres parasitosis y la especificidad con 75 sueros de pacientes con otras parasitosis, 10 de pacientes con otras enfermedades y 15 sueros de personas no parasitadas. Resultados. La técnica reconoció trece glicoproteínas (GP: GP 35, 31, 24, 23, 18, 17, 14 y 13 kDa para cisticercosis, GP 8,16 y 21 kDa para hidatidosis y GP: 17 y 23 kDa para fascioliasis. La prueba detectó la presencia de anticuerpos alcanzando una sensibilidad de 96% (IC95%: 94,62-98,54% en la detección de una o las trece bandas, una especificidad de 100% (IC95%: 99,50 - 100,00%; individualmente, se tuvo una sensibilidad para cisticercosis de 97% (IC95%: 93,16-100%, para hidatidosis de 94% (IC95%: 88,85-99,15% y para fascioliasis de 96% (IC95%: 91,66-100%. Conclusiones. La prueba de Western blot es eficaz en la detección, simultanea de anticuerpos en pacientes con cisticercosis, hidatidosis y fascioliasis humana, y puede ser utilizada como prueba de descarte o confirmatoria en zonas endémicas.

Evaluation of treatment of colostrum-deprived kittens with equine IgG.

Science.gov (United States)

Crawford, P Cynda; Hanel, Rita M; Levy, Julie K

2003-08-01

To evaluate equine IgG as a treatment for kittens with failure of passive transfer of immunity (FPT). 13 specific pathogen-free queens and their 77 kittens. Kittens were randomized at birth into 9 treatment groups. One group contained colostrum-fed (nursing) kittens; the other groups contained colostrum-deprived kittens that were administered supplemental feline or equine IgG PO or SC during the first 12 hours after birth. Blood samples were collected at serial time points from birth to 56 days of age for determination of serum IgG concentrations. The capacity of equine IgG to opsonize bacteria for phagocytosis by feline neutrophils was determined via flow cytometry. Kittens that received feline or equine IgG SC had significantly higher serum IgG concentrations than those of kittens that received the supplements PO. In kittens that were administered supplemental IgG SC, serum IgG concentrations were considered adequate for protection against infection. The half-life of IgG in kittens treated with equine IgG was shorter than that in kittens treated with feline IgG. Feline IgG significantly enhanced the phagocytosis of bacteria by feline neutrophils, but equine IgG did not. Serum concentrations of equine IgG that are considered protective against infection are easily attained in kittens, but the failure of these antibodies to promote bacterial phagocytosis in vitro suggests that equine IgG may be an inappropriate treatment for FPT in kittens.

Diagnosis and Treatment of IgG4-Related Disease.

Science.gov (United States)

Kamisawa, Terumi; Okazaki, Kazuichi

2017-01-01

It is critical to differentiate IgG4-related disease (IgG4-RD) from malignant tumor and similar disease of the affected organ to apply appropriate therapy and avoid unnecessary surgery. IgG4-RD is diagnosed on combination of typical radiological findings; elevation of serum IgG4 levels; histopathological findings of abundant infiltration of IgG4-positive plasma cells and lymphocytes, storiform fibrosis , and obliterative phlebitis ; association with other IgG4-related diseases; and response to steroids. Histopathological approach is particularly recommended. Systemic glucocorticoids are currently the first-line approach for IgG4-RD, and the indications are symptoms. The initial recommended dose of oral prednisolone for induction of remission is 0.6 mg/kg/day, administered for 2-4 weeks. This dose is gradually tapered to a maintenance dose of 2.5-5 mg/day over a period of 2-3 months. As IgG4-RD sometimes relapses after steroids, maintenance therapy is usually performed in Japan. However, as IgG4-RD patients are typically elderly and are at high risk of developing steroid-related complications, cessation of the medication should be attempted at least within 3 years. For relapsed IgG4-RD, re-administration or dose up of steroid is effective, but the addition of immunomodulatory drugs such as azathioprine has been considered to be appropriate. B cell depletion with rituximab (an anti-CD20 antibody) is effective, even in many patients in whom treatment with immunomodulatory drugs was unsuccessful. The short-term clinical, morphological, and functional outcomes of most IgG4-RD patients treated with steroid therapy are good, but the long-term outcomes are less clear due to several unknown factors such as relapse, developed fibrosis, and associated malignancy.

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.

Anti-dog IgG secondary antibody successfully detects IgG in a variety of aquatic mammals

Science.gov (United States)

Roehl, Katherine; Jankowski, Mark D.; Hofmeister, Erik K.

2016-01-01

Serological tests play an important role in the detection of wildlife diseases. However, while there are many commercial assays and reagents available for domestic species, there is a need to develop efficient serological assays for wildlife. In recent years, marine mammals have represented a wildlife group with emerging infectious diseases, such as influenza, brucellosis, and leptospirosis. However, with the exception of disease-agent-specific assays or functional assays, few reports describe the use of antibody detection assays in marine mammals. In an indirect enzyme-linked immunoassay (EIA) or an immunofluorescence assay, antibody is detected using an antitarget species secondary conjugated antibody. The sensitivity of the assay depends on the avidity of the binding reaction between the bound antibody and the detection antibody. A commercial polyclonal antidog IgG conjugated antibody was tested in an EIA for its ability to sensitively detect the IgG of seven marine mammals including sea otter (Enhydra lutris), polar bear (Ursus maritimus), grey seal (Halichoerus grypus), harbor seal (Phoca vitulina), northern elephant seal (Mirounga angustirostris), California sea lion (Zalophus californianus), Pacific walrus (Odobenus rosmarus) and one freshwater mammal: Asian small-clawed otter (Aonyx cinerea). With the exception of Asian small-clawed sea otters, the detection of IgG in these marine mammals either exceeded or was nearly equal to detection of dog IgG. The use of the tested commercial antidog IgG antibody may be a valid approach to the detection of antibody response to disease in sea mammals.

Gingivitis y Anticuerpos Anticitoplasmáticos de Neutrófilos en niños y adolescentes con leucemia

OpenAIRE

Viera, Ninoska T.; Rojas de Morales, Thais; Navas, Rita M.; Zambrano, Olga R.; Paz de Gudiño, Mercedes

2004-01-01

Introducción: Las enfermedades sistémicas pueden originar y exacerbar alteraciones en el periodonto. Se ha demostrado la presencia de Anticuerpos Anticitoplasmáticos de neutrófilos (ANCA) en pacientes con enfermedad periodontal destructiva y con enfermedades sistémicas. Objetivo: Determinar la relación entre gingivitis y los ANCA en niños y adolescentes con leucemia que asistieron al Servicio Autónomo Hospital Universitario de Maracaibo y a la Fundación del Hospital de Especialidades Pediátri...

Immunology of IgG4-related disease

Science.gov (United States)

Della-Torre, E; Lanzillotta, M; Doglioni, C

2015-01-01

Immunoglobulin G4-related disease (IgG4-RD) is a fibroinflammatory condition that derives its name from the characteristic finding of abundant IgG4+ plasma cells in affected tissues, as well as the presence of elevated serum IgG4 concentrations in many patients. In contrast to fibrotic disorders, such as systemic sclerosis or idiopathic pulmonary fibrosis in which the tissues fibrosis has remained largely intractable to treatment, many IgG4-RD patients appear to have a condition in which the collagen deposition is reversible. The mechanisms underlying this peculiar feature remain unknown, but the remarkable efficacy of B cell depletion in these patients supports an important pathogenic role of B cell/T cell collaboration. In particular, aberrant T helper type 2 (Th2)/regulatory T cells sustained by putative autoreactive B cells have been proposed to drive collagen deposition through the production of profibrotic cytokines, but definitive demonstrations of this hypothesis are lacking. Indeed, a number of unsolved questions need to be addressed in order to fully understand the pathogenesis of IgG4-RD. These include the identification of an antigenic trigger(s), the implications (if any) of IgG4 antibodies for pathophysiology and the precise immunological mechanisms leading to fibrosis. Recent investigations have also raised the possibility that innate immunity might precede adaptive immunity, thus further complicating the pathological scenario. Here, we aim to review the most recent insights on the immunology of IgG4-RD, focusing on the relative contribution of innate and adaptive immune responses to the full pathological phenotype of this fibrotic condition. Clinical, histological and therapeutic features are also addressed. PMID:25865251

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.

Fluorescent IgG fusion proteins made in E. coli

Science.gov (United States)

Luria, Yael; Raichlin, Dina; Benhar, Itai

2012-01-01

Antibodies are among the most powerful tools in biological and biomedical research and are presently the fastest growing category of new bio-pharmaceutics. The most common format of antibody applied for therapeutic, diagnostic and analytical purposes is the IgG format. For medical applications, recombinant IgGs are made in cultured mammalian cells in a process that is too expensive to be considered for producing antibodies for diagnostic and analytical purposes. Therefore, for such purposes, mouse monoclonal antibodies or polyclonal sera from immunized animals are used. While looking for an easier and more rapid way to prepare full-length IgGs for therapeutic purposes, we recently developed and reported an expression and purification protocol for full-length IgGs, and IgG-based fusion proteins in E. coli, called “Inclonals.” By applying the Inclonals technology, we could generate full-length IgGs that are genetically fused to toxins. The aim of the study described herein was to evaluate the possibility of applying the “Inclonals” technology for preparing IgG-fluorophore fusion proteins. We found that IgG fused to the green fluorescent proteins enhanced GFP (EGFP) while maintaining functionality in binding, lost most of its fluorescence during the refolding process. In contrast, we found that green fluorescent Superfolder GFP (SFGFP)-fused IgG and red fluorescent mCherry-fused IgG were functional in antigen binding and maintained fluorescence intensity. In addition, we found that we can link several SFGFPs in tandem to each IgG, with fluorescence intensity increasing accordingly. Fluorescent IgGs made in E. coli may become attractive alternatives to monoclonal or polyclonal fluorescent antibodies derived from animals. PMID:22531449

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

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

International Nuclear Information System (INIS)

Martins, Estefania M.N.; Andrade, Antero S.R.; Reis, Bernardo S.; Goes, Alfredo M.

2007-01-01

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)

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)

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

Directory of Open Access Journals (Sweden)

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.

Change of Serum IgG4 in Patients with Ocular Adnexal Marginal Zone B Cell Lymphoma Associated with IgG4-Related Ophthalmic Disease After Treatment.

Science.gov (United States)

Wu, Yuan-Hung; Wang, Lei-Chi; Yen, Sang-Hue; Yu, Wei-Kuang; Kao, Shu-Ching; Kau, Hui-Chuan; Tsai, Chieh-Chih; Liu, Catherine Jui-Ling

2017-09-01

To investigate the change of serum IgG4 concentrations correlated with clinical evolution in patients with ocular adnexal marginal zone B cell lymphoma associated with IgG4-related ophthalmic disease (IgG4-ROD). Three consecutive patients with histopathologically confirmed ocular adnexal marginal zone B cell lymphoma associated with IgG4-ROD were evaluated. Two patients received radiotherapy and 1 patient received steroid therapy. Treatment outcome was evaluated by clinical symptoms, radiologic examination, and change of serum IgG4 level in these patients. All patients had elevated serum IgG4 before treatment (462, 338, and 780 mg/dL respectively.) The 2 patients who received radiotherapy achieved complete remission and the serum IgG4 decreased to 345 and 92 mg/dL, respectively. The patient who underwent systemic steroid achieved partial remission and the serum IgG4 decrease to 161 mg/dL. Our study showed elevated serum IgG4 in all patients with ocular adnexal marginal zone B cell lymphoma associated with IgG4-ROD. In addition, the elevated serum IgG4 may decrease or keep stable after treatment, accompanied by improvement in clinical symptoms and reduction of lesions.

IgG4-related disease in the eye and ocular adnexa.

Science.gov (United States)

Derzko-Dzulynsky, Larissa

2017-11-01

IgG4-related disease is a multi-organ fibro-inflammatory disease with characteristic histopathology showing lymphoplasmacytic infiltration, increased IgG4+ plasma cells and elevated IgG4/IgG ratios (>40%). The lacrimal gland is the most common ocular site of involvement. Scleritis and intraocular involvement in IgG4-related ophthalmic disease (IgG4-ROD) have recently been reported. The purpose of this review is to describe orbital and intraocular IgG4-ROD with a focus on publications since 2016. Case reports of scleritis and uveitis in IgG4-ROD have been described since 2012. Systemic prednisone is recommended as the first-line treatment, but immunosuppressive therapy may be required for steroid-sparing or in steroid-resistant cases. High rates of systemic IgG4-RD involvement exist in patients with bilateral IgG4-ROD or if the lacrimal gland is involved. Rituximab is the most specific immune targeted therapy available with high rates of remission. IgG4-ROD is an emerging cause of scleritis and uveitis and should be considered in any patient with multisystem inflammatory disease. New targeted immune therapies may improve outcomes and lead to clinical remission.

Overview of IgG4-Related Tubulointerstitial Nephritis and Its Mimickers

Directory of Open Access Journals (Sweden)

Hyeon Joo Jeong

2016-01-01

Full Text Available Tubulointerstitial nephritis (TIN is the most common form of renal involvement in IgG4-related disease. It is characterized by a dominant infiltrate of IgG4-positive plasma cells in the interstitium and storiform fibrosis. Demonstration of IgG4-positive plasma cells is essential for diagnosis, but the number of IgG4-positive cells and the ratio of IgG4-positive/IgG-positive plasma cells may vary from case to case and depending on the methods of tissue sampling even in the same case. IgG4-positive plasma cells can be seen in TIN associated with systemic lupus erythematosus, Sjögren syndrome, or anti-neutrophil cytoplasmic antibody–associated vasculitis, which further add diagnostic confusion and difficulties. To have a more clear view of IgG4-TIN and to delineate differential points from other TIN with IgG4-positive plasma cell infiltrates, clinical and histological features of IgG4-TIN and its mimickers were reviewed. In the rear part, cases suggesting overlap of IgG4-TIN and its mimickers and glomerulonephritis associated with IgG4-TIN were briefly described.

Gingivitis y Anticuerpos Anticitoplasmáticos de Neutrófilos en niños y adolescentes con leucemia

OpenAIRE

Viera, Ninoska; Rojas de Morales, Thais; Navas, Rita; Zambrano, Olga; Paz de Gudiño, Mercedes

2004-01-01

Introducción: Las enfermedades sistémicas pueden originar y exacerbar alteraciones en el periodonto. Se ha demostrado la presencia de Anticuerpos Anticitoplasmáticos de neutrófi los (ANCA) en pacientes con enfermedad periodontal destructiva y con enfermedades sistémicas. Objetivo: Determinar la re la ción entre gingivitis y los ANCA en niños y ado les cen tes con leucemia que asistieron al Servicio Autónomo Hospital Uni ver si ta rio de Maracaibo y a la Fundación del Hosp...

Caracterización de la cadena CD3 épsilon en el primate del nuevo mundo Aotus nancymaae

Directory of Open Access Journals (Sweden)

Jean Paul Vernot

2008-06-01

Conclusiones. La estructura primaria determinada aquí sugiere que la proteína de Aotus tiene una funcionalidad similar y que los pasos iniciales de activación de la célula T se suceden como en los humanos; por otra parte, la gran variabilidad encontrada en el ectodominio, permite explicar por qué algunos anticuerpos monoclonales dirigidos contra el complejo CD3 de humano no reconocen estas estructuras en el Aotus.

Kinetics of IgG antibody to cytomegalovirus (CMV) after birth and seroprevalence of anti-CMV IgG in Chinese children.

Science.gov (United States)

Chen, Jie; Hu, Lingqing; Wu, Meiling; Zhong, Tianying; Zhou, Yi-Hua; Hu, Yali

2012-12-10

Prevalence of cytomegalovirus (CMV) infection is 90-100% in developing countries; however, the kinetics of anti-CMV IgG in infants remains elusive. Sera from 112 mother-newborn pairs and longitudinal samples from 41 infants up to 2-year old were tested for anti-CMV IgG and IgM. Additionally, samples from 837 healthy children were included. Of 112 mothers, 108 (96.4%) were anti-CMV IgG positive; their 108 newborns were also seropositive. In a 2-year follow-up among 40 infants of positive mothers, anti-CMV IgG level in 8 individuals decreased with time and became undetectable by age of 3.5-8 months, and that in 32 others decreased at 1- and 3.5-month old, and then increased. Based on the positive IgM, rising IgG levels, and low anti-CMV IgG avidity index, 76.7% of the primary infections were demonstrated to occur during 1-3.5 months of age. The overall seroprevalence of anti-CMV in 837 children was 82.4%, which was generally constant from 2 to 8 years old (χ2 = 3.150, p = 0.790). The maternally acquired anti-CMV IgG in infants disappears before 8-month old. Primary CMV infection in Chinese children mostly occurs during 1-3.5 months of age. Whether the relatively lower seroprevalence of anti-CMV in Chinese children found in this survey may reflect the positive rate in child-bearing age women in the future remains to be further studied.

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

NARCIS (Netherlands)

Labrijn, Aran F.; Buijsse, Antonio Ortiz; van den Bremer, Ewald T. J.; Verwilligen, Annemiek Y. W.; Bleeker, Wim K.; Thorpe, Susan J.; Killestein, Joep; Polman, Chris H.; Aalberse, Rob C.; Schuurman, Janine; van de Winkel, Jan G. J.; Parren, Paul W. H. I.

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

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

NARCIS (Netherlands)

Labrijn, Aran F.; Buijsse, Antonio Ortiz; van den Bremer, Ewald T. J.; Verwilligen, Annemiek Y. W.; Bleeker, Wim K.; Thorpe, Susan J.; Killestein, Joep; Polman, Chris H.; Aalberse, Rob C.; Schuurman, Janine; van de Winkel, Jan G. J.; Parren, Paul W. H. I.

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, Fab-arm exchange with therapeutic antibodies has not been demonstrated

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

Directory of Open Access Journals (Sweden)

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

Contra Copyright, Again

OpenAIRE

Wendy McElroy

2011-01-01

This revised version of the author’s 1985 article “Contra Copyright” includes a new, introductory section explaining the background of the author’s path to copyright abolitionism. The main article surveys various libertarian debates on this issue, including the anti-intellectual property (IP) views of Benjamin Tucker and the pro-IP views of Lysander Spooner. McElroy argues that the issue of copyright hinges on the question: can ideas be property? Because only scarce goods can be property, and...

Orbital Pseudotumor: Uncommon Initial Presentation of IgG4-Related Disease

Directory of Open Access Journals (Sweden)

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.

Contra trading in Bursa Malaysia Securities Berhad: a Sharīʿah and legal appraisal

Directory of Open Access Journals (Sweden)

Noor Suhaida Kasri

2017-07-01

Full Text Available Purpose - The purpose of this paper is to analyze the practice of contra trading in Bursa Malaysia Securities Berhad. Through a critical examination of the practice, it aims to discuss the issues from the angles of Sharīʿah and Malaysian common law. Design/methodology/approach - The paper uses a qualitative research methodology. The information on the practice of contra trading is obtained through the Bursa Malaysia Securities Berhad’s website and literature as well as series of meetings and discussions held with Bursa Malaysia Securities Berhad. In comprehending and dissecting the Sharīʿah and legal issues, classical along with contemporary Sharīʿah literature including local and international Sharīʿah advisory bodies’ resolutions and standards have been referred to. The Sharīʿah analysis of these issues is further supported by reference to the statute and by-laws of Bursa Malaysia Securities Berhad as well as other related legal literature. Findings - This paper finds that contra trading involves a real sale and purchase of shares; the shares are not taken into the possession of the contra trader, neither physically nor constructively; the liability of shares is not transferred to the contra trader; though the practice of profiting in contra trading may contradict the prohibition on profiting without bearing liability, the permissibility of contra trading could still be argued from the contextual approach of public interest (maṣlaḥah and needs (hājah; and contra trading is not gambling. Research limitations/implications - This paper is limited in its analysis to only Sharīʿah and legal perspectives. It does not cover a thorough empirical and quantitative investigation that would measure the extent of the public needs for contra trading and the real benefits that contra trading brings about to the society in the long run. Such studies will further demonstrate whether contra trading deserves a relaxation from the strict Shar

Elevated IgG4 serum levels in patients with cystic fibrosis.

Science.gov (United States)

Clerc, Axelle; Reynaud, Quitterie; Durupt, Stéphane; Chapuis-Cellier, Colette; Nové-Josserand, Raphaële; Durieu, Isabelle; Lega, Jean Christophe

2017-01-01

Serum immunoglobulin (Ig) G4 elevation has been associated with several pathological conditions other than IgG4-related disease (IgG4-RD). In cystic fibrosis (CF), an elevation of specific IgG4 has been associated with colonization and infection by Pseudomonas aeruginosa. IgG4 elevation may be a marker of chronic infection or inflammatory stimulation. The aim of this study was to explore the prevalence of elevated IgG4 levels in CF and its correlation with the major clinical and microbiological features found in CF patients. In a cross-sectional study, we analyzed data from a large cohort of adult CF patients attending the CF center of Lyon University Hospital. An elevated IgG4 level was defined as being above the cut-off value of 135 mg/dL. One hundred and sixty-five CF patients were analyzed. An IgG4 elevation was detected in 43 patients (26%). Compared with the control group (≤ 135 mg/dL), high IgG4 patients exhibited a greater prevalence of Staphylococcus aureus colonization and higher IgG, IgG1, IgG2 and IgE levels. No significant differences were observed in terms of pulmonary function, colonization with Pseudomonas aeruginosa, or the annual rate of bronchial exacerbations. An elevated IgG4 serum level was frequently detected in adult CF patients and did not appear to be associated with poor lung function. We suggest that IgG4 elevation is a marker of the activation of tolerance. Its clinical significance remains to be demonstrated.

Efectividad del tratamiento de la violencia contra la pareja en pacientes drogodependientes

Directory of Open Access Journals (Sweden)

Javier Fernández-Montalvo

2015-04-01

Full Text Available En este artículo se analiza la efectividad de los programas de tratamiento psicológico para drogodependientes, que presentan conductas violentas contra la pareja. Para ello, se revisan, en primer lugar, los estudios que valoran la influencia del tratamiento habitual sobre las adicciones y la reducción de las conductas violentas contra la pareja. En segundo lugar, se analizan los resultados de los programas de intervención conjunta que se han desarrollado hasta la fecha, en el ámbito internacional, en los centros de tratamiento para la adicción con drogodependientes que ejercen, además, violencia contra la pareja. Los resultados muestran, por una parte, que la intervención con pacientes adictos produce una disminución importante en la tasa de violencia contra la pareja asociada a la adicción. Por otra parte, los programas de intervención con adicciones constituyen un marco de gran utilidad para aplicar, de forma conjunta, tratamientos específicos para aquellos adictos con un problema asociado de violencia contra la pareja. Los resultados de estos programas de intervención muestran los mejores datos en la reducción de la tasa de violencia contra la pareja de los pacientes adictos. Se comentan las implicaciones de todo ello para la práctica clínica y para las investigaciones futuras.

A rubella serosurvey in postpartum women in the three regions of Peru Estudio serológico de rubéola en mujeres recién paridas en las tres regiones de Perú

Directory of Open Access Journals (Sweden)

Luis Suárez-Ognio

2007-08-01

Full Text Available OBJECTIVE: To determine the proportion of postpartum women aged 15-49 in Peru who are susceptible to rubella, in order to help address strategies to eliminate rubella and to prevent congenital rubella syndrome (CRS in the country. METHODS: A cross-sectional survey was conducted during March and April 2003 in six main regional hospitals, in the three geographic regions (coast, mountain, and jungle of Peru. For the postpartum women who provided written informed consent, a questionnaire was administered and a blood specimen was collected. Sera were tested for rubella immunoglobulin G (IgG antibody, using a commercial enzyme-linked immunosorbent serologic assay (ELISA kit. Univariate, bivariate, and multivariate analyses were carried out to assess risk factors for susceptibility. RESULTS: In total, 1 236 postpartum women were enrolled. The overall proportion of IgG-antibody negative women was 12.8% (95% confidence interval (CI: 10.9%-14.6%. Bivariate analysis found the following variables associated with susceptibility: living in the jungle region (odds ratio (OR = 1.65; 95% CI: 1.13-2.42; age OBJETIVO: Determinar la proporción de mujeres recién paridas de 15-49 años de edad susceptibles a la rubéola en Perú, a fin de contribuir a establecer estrategias para eliminar la rubéola y evitar el síndrome de rubéola congénita (SRC en el país. MÉTODOS: Se realizó un estudio transversal en marzo y abril de 2003 en seis hospitales regionales principales de tres regiones geográficas (costa, sierra y selva de Perú. A las mujeres recién paridas que dieron su consentimiento informado por escrito se les aplicó un cuestionario y se les tomó una muestra de sangre. La detección serológica de anticuerpos de la clase IgG contra rubéola se realizó mediante un ensayo inmunoenzimático comercial tipo ELISA. Se realizaron análisis con una, dos y múltiples variables para evaluar los factores de riesgo de ser susceptible a la enfermedad. RESULTADOS: En

Utility of Serum IgG4 Levels in a Multiethnic Population.

Science.gov (United States)

Qi, Ruyu; Chen, Luke Y C; Park, Sujin; Irvine, Robert; Seidman, Michael A; Kelsall, John T; Collins, David; Yin, Vivian; Slack, Graham W; Mattman, Andre; Lam, Eric; Carruthers, Mollie N

2018-01-01

IgG4-related disease (IgG4-RD) is a recently recognized condition defined by characteristic histopathologic findings in affected organs. Serum IgG4 concentration is often but not always elevated. The sensitivity and specificity of serum IgG4 vary greatly across studies and has been anecdotally associated to ethnicity. Our study was conducted to investigate the difference in serum IgG4 levels between Asian and non-Asian patients with IgG4-RD. This is a single-center retrospective study of 26 Asian and 10 non-Asian patients with histologically confirmed IgG4-RD. Serum IgG4 levels, clinical features and other laboratory findings were compared between the 2 groups, 31 Asian and 11 non-Asian patients with non-IgG4-RD rheumatic diseases were randomly identified to evaluate test characteristics of serum IgG4 measurement. Median serum IgG4 at time of diagnosis was significantly higher in Asian (median = 11.2g/L, interquartile range: 4.6-19.7) than non-Asian patients (median = 2.9g/L, interquartile range: 0.7-5.4, P = 0.0094), as well as the median serum IgG and total protein. Asian patients had more eosinophilia and polyclonal hypergammaglobulinemia than non-Asian patients (P = 0.016 and 0.001, respectively). Test sensitivity was higher in Asian (96%) than non-Asian patients (67%), whereas test specificity was higher in non-Asian patients (91% versus 71%). Asian patients with IgG4-RD have more exuberant serum IgG4, IgG and polyclonal hypergammaglobulinemia than non-Asian patients; the mechanism of this difference requires further study. These findings have significant clinical importance and must be accounted for in the diagnostic workup of patients in multiethnic settings. Copyright © 2018 Southern Society for Clinical Investigation. Published by Elsevier Inc. All rights reserved.

Kinetics of IgG antibody to cytomegalovirus (CMV after birth and seroprevalence of anti-CMV IgG in Chinese children

Directory of Open Access Journals (Sweden)

Chen Jie

2012-12-01

Full Text Available Abstract Background Prevalence of cytomegalovirus (CMV infection is 90–100% in developing countries; however, the kinetics of anti-CMV IgG in infants remains elusive. Methods Sera from 112 mother-newborn pairs and longitudinal samples from 41 infants up to 2-year old were tested for anti-CMV IgG and IgM. Additionally, samples from 837 healthy children were included. Results Of 112 mothers, 108 (96.4% were anti-CMV IgG positive; their 108 newborns were also seropositive. In a 2-year follow-up among 40 infants of positive mothers, anti-CMV IgG level in 8 individuals decreased with time and became undetectable by age of 3.5–8 months, and that in 32 others decreased at 1- and 3.5-month old, and then increased. Based on the positive IgM, rising IgG levels, and low anti-CMV IgG avidity index, 76.7% of the primary infections were demonstrated to occur during 1–3.5 months of age. The overall seroprevalence of anti-CMV in 837 children was 82.4%, which was generally constant from 2 to 8 years old (χ2 = 3.150, p = 0.790. Conclusions The maternally acquired anti-CMV IgG in infants disappears before 8-month old. Primary CMV infection in Chinese children mostly occurs during 1–3.5 months of age. Whether the relatively lower seroprevalence of anti-CMV in Chinese children found in this survey may reflect the positive rate in child-bearing age women in the future remains to be further studied.

IgG4 immunostaining and its implications in orbital inflammatory disease.

Directory of Open Access Journals (Sweden)

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.

Anti-pituitary antibodies against corticotrophs in IgG4-related hypophysitis.

Science.gov (United States)

Iwata, Naoko; Iwama, Shintaro; Sugimura, Yoshihisa; Yasuda, Yoshinori; Nakashima, Kohtaro; Takeuchi, Seiji; Hagiwara, Daisuke; Ito, Yoshihiro; Suga, Hidetaka; Goto, Motomitsu; Banno, Ryoichi; Caturegli, Patrizio; Koike, Teruhiko; Oshida, Yoshiharu; Arima, Hiroshi

2017-06-01

IgG4-related disease is a systemic inflammatory disease characterized by infiltration of IgG4-positive plasma cells into multiple organs, including the pituitary gland. Autoimmunity is thought to be involved in the pathogenesis of IgG4-related disease. The diagnosis of IgG4-related hypophysitis (IgG4-RH) is difficult because its clinical features, such as pituitary swelling and hypopituitarism, are similar to those of other pituitary diseases, including lymphocytic hypophysitis and sellar/suprasellar tumors. The presence and significance of anti-pituitary antibodies (APA) in IgG4-RH is unclear. In this case-control study, we used single indirect immunofluorescence on human pituitary substrates to assess the prevalence of serum APA in 17 patients with IgG4-RH, 8 control patients with other pituitary diseases (lymphocytic infundibulo-neurohypophysitis, 3; craniopharyngioma, 2; germinoma, 3), and 9 healthy subjects. We further analyzed the endocrine cells targeted by the antibodies using double indirect immunofluorescence. APA were found in 5 of 17 patients with IgG4-RH (29%), and in none of the pituitary controls or healthy subjects. The endocrine cells targeted by the antibodies in the 5 IgG4-RH cases were exclusively corticotrophs. Antibodies were of the IgG1 subclass, rather than IgG4, in all 5 cases, suggesting that IgG4 is not directly involved in the pathogenesis. Finally, antibodies recognized pro-opiomelanocortin in 2 of the cases. Our study suggests that autoimmunity is involved in the pathogenesis of IgG4-RH and that corticotrophs are the main antigenic target, highlighting a possible new diagnostic marker for this condition.

IgG4 Immunostaining and Its Implications in Orbital Inflammatory Disease

Science.gov (United States)

Wong, Amanda J.; Planck, Stephen R.; Choi, Dongseok; Harrington, Christina A.; Troxell, Megan L.; Houghton, Donald C.; Stauffer, Patrick; Wilson, David J.; Grossniklaus, Hans E.; Dailey, Roger A.; Ng, John D.; Steele, Eric A.; Harris, Gerald J.; Czyz, Craig; Foster, Jill A.; White, Valerie A.; Dolman, Peter J.; Kazim, Michael; Patel, Payal J.; Edward, Deepak P.; Katan, Hind al; Hussain, Hailah al; Selva, Dinesh; Yeatts, R. Patrick; Korn, Bobby S.; Kikkawa, Don O.; Rosenbaum, James T.

2014-01-01

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. PMID:25303270

Aplicaciones terapéuticas de las inmunoglobulinas humanas en Pediatría

Directory of Open Access Journals (Sweden)

Amauri Lázaro Noda Albelo

Full Text Available En la actualidad existen diversos productos farmacéuticos constituidos por inmunoglobulinas (fundamentalmente IgG, purificadas por diversos métodos, lo que implica que pueden ser administradas por diversas vías (intramuscular, intravenosa y subcutánea. Estos productos tienen un amplio espectro de indicaciones en diversas enfermedades. Las inmunoglobulinas son los efectores finales de la respuesta inmune humoral, por lo que sus indicaciones fundamentales incluyen la terapia de reemplazo en enfermedades que cursan con déficit en la producción de anticuerpos, las situaciones en que se necesita de manera inmediata la presencia de anticuerpos neutralizantes, como en las terapias posexposición, y en enfermedades que cursan con disrregulación de la respuesta inmune.

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

Directory of Open Access Journals (Sweden)

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

¿Es necesario investigar anticuerpos IgM contra el virus de la hepatitis A cuando el enzimograma hepático es normal? Is it necessary to investigate anti-hepatitis A virus (HAV IgM antibodies when the hepatic enzymogram is normal?

Directory of Open Access Journals (Sweden)

C. Coitinho

2007-09-01

Full Text Available La hepatitis por virus A (VHA es la más frecuente de las hepatitis virales en el mundo, especialmente en los países subdesarrollados. Donde esta enfermedad es endémica, se suelen realizar un gran número de estudios de laboratorio para confirmarla. El objetivo del presente trabajo fue evaluar la utilidad de investigar anticuerpos IgM anti hepatitis A (IgM anti-VHA para el diagnóstico de la VHA en pacientes con niveles séricos normales de aspartato y alanina aminotransferasas (AST/ALT. Todos los pacientes que concurrieron al laboratorio con solicitud de enzimograma hepático y anticuerpos IgM anti-VHA durante el período octubre 2005-marzo 2006 fueron evaluados en este estudio. Los datos clínicos más frecuentes fueron presunción de hepatitis e ictericia (27,5 y 12,7%. La determinación de IgM anti-VHA se realizó por ensayo inmunoenzimático de micropartículas (MEIA; la de enzimas hepáticas en un multianalizador. De los 158 pacientes estudiados, 84 tenían valores elevados de AST/ALT; dentro de este grupo, el 82% fue reactivo para IgM anti-VHA. Los 74 pacientes restantes mostraron niveles normales de AST/ALT y solo 7 de ellos, bajo control de evolución por VHA ya confirmada, fueron reactivos para IgM anti-VHA. El 49% de los pacientes IgM anti-VHA reactivos correspondió a menores de 10 años. De acuerdo con estas observaciones, sugerimos que los estudios de laboratorio para confirmar infección aguda por VHA deberían realizarse en forma secuencial, ya que es innecesaria la determinación de anticuerpos IgM anti-VHA cuando las aminotransferasas séricas son normales.Type A viral Hepatitis (HAV is the most frequent viral hepatitis around the world, especially in low income countries. In order to confirm this disease, a lot of laboratory tests are annually carried out where HAV is endemic. Our objective was to establish the utility of investigating anti-hepatitis A virus (HAV IgM antibodies for HAV diagnosis in patients with normal

IgG4 autoantibodies are inhibitory in the autoimmune disease bullous pemphigoid.

Science.gov (United States)

Zuo, Yagang; Evangelista, Flor; Culton, Donna; Guilabert, Antonio; Lin, Lin; Li, Ning; Diaz, Luis; Liu, Zhi

2016-09-01

The IgG4 subclass of antibodies exhibits unique characteristics that suggest it may function in an immunoregulatory capacity. The inhibitory function of IgG4 has been well documented in allergic disease by the demonstration of IgG4 blocking antibodies, but similar functions have not been explored in autoimmune disease. Bullous pemphigoid (BP) is a subepidermal autoimmune blistering disease characterized by autoantibodies directed against BP180 and an inflammatory infiltrate including eosinophils and neutrophils. Animal models have revealed that the NC16A region within BP180 harbors the critical epitopes necessary for autoantibody mediated disease induction. BP180 NC16A-specific IgG belong to the IgG1, IgG3, and IgG4 subclasses. The purpose of this study was to determine effector functions of different IgG subclasses of NC16A-specific autoantibodies in BP. We find that IgG4 anti-NC16A autoantibodies inhibit the binding of IgG1 and IgG3 autoantibodies to the NC16A region. Moreover, IgG4 anti-NC16A blocks IgG1 and IgG3 induced complement fixation, neutrophil infiltration, and blister formation clinically and histologically in a dose-dependent manner following passive transfer to humanized BP180-NC16A mice. These findings highlight the inhibitory role of IgG4 in autoimmune disease and have important implications for the treatment of BP as well as other antibody mediated inflammatory and autoimmune diseases. Copyright © 2016 Elsevier Ltd. All rights reserved.

Kinetics of IgG antibody to cytomegalovirus (CMV) after birth and seroprevalence of anti-CMV IgG in Chinese children

OpenAIRE

Chen, Jie; Hu, Lingqing; Wu, Meiling; Zhong, Tianying; Zhou, Yi-Hua; Hu, Yali

2012-01-01

Abstract Background Prevalence of cytomegalovirus (CMV) infection is 90–100% in developing countries; however, the kinetics of anti-CMV IgG in infants remains elusive. Methods Sera from 112 mother-newborn pairs and longitudinal samples from 41 infants up to 2-year old were tested for anti-CMV IgG and IgM. Additionally, samples from 837 healthy children were included. Results Of 112 mothers, 108 (96.4%) were anti-CMV IgG positive; their 108 newborns were also seropositive. In a 2-year follow-u...

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

NARCIS (Netherlands)

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

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

Neisseria meningitidis Group A IgG1 and IgG2 Subclass Immune Response in African Children Aged 12–23 Months Following Meningococcal Vaccination

Science.gov (United States)

Holme, Daniel; Findlow, Helen; Sow, Samba O.; Idoko, Olubukola T.; Preziosi, Marie-Pierre; Carlone, George; Plikaytis, Brian D.; Borrow, Ray

2015-01-01

Background. A group A meningococcal conjugate vaccine, PsA-TT, was licensed in 2010 and was previously studied in a phase 2 clinical trial to evaluate its safety and immunogenicity in African children 12–23 months of age. Methods. Subjects received either PsA-TT; meningococcal group A, C, W, Y polysaccharide vaccine (PsACWY); or Haemophilus influenzae type b conjugate vaccine (Hib-TT). Forty weeks following primary vaccination, the 3 groups were further randomized to receive either PsA-TT, one-fifth dose of PsACWY, or Hib-TT. Group A–specific immunoglobulin G (IgG) subclass response was characterized using an enzyme-linked immunosorbent assay. Results. The predominant IgG subclass response, regardless of vaccine, was IgG1. One month following primary vaccination, the geometric mean concentrations (GMCs) of IgG1 and IgG2 in the PsA-TT group were 21.73 µg/mL and 6.27 µg/mL, whereas in the PsACWY group the mean GMCs were 2.01 µg/mL and 0.97 µg/mL, respectively (P Group A–specific IgG1 and IgG2 GMCs remained greater in the PsA-TT group than in the PsACWY group 40 weeks following primary vaccination (P vaccines. Conclusions. Vaccination of African children aged 12–24 months with either PsA-TT or PsACWY elicited a predominantly IgG1 response. The IgG1:IgG2 mean ratio decreased following successive vaccination with PsACWY, indicating a shift toward IgG2, suggestive of the T-cell–independent immune response commonly associated with polysaccharide antigens. Clinical Trials Registration. SRCTN78147026. PMID:26553689

Humoral immune alterations caused by lead: studies on an adult toad model Alteraciones inmunes humorales causadas por plomo: estudios en un modelo de sapo adulto

Directory of Open Access Journals (Sweden)

Carolina E. Rosenberg

2007-07-01

Full Text Available There is evidence that environmental metal levels affect the immune function. In the particular case of the impact of heavy metals, information available suggests that the immune system is a target for low-dose Pb exposure. Among vertebrates it was shown that amphibians are capable of forming antibodies against a variety of antigens, causing several responses such as anaphylactic response and rejecting grafts. In this study, the production of antibodies was assessed against sheep red blood cells (SRBC in the anuran Bufo arenarum after six weekly injections of sublethal doses of lead (50 mg.kg-1, as lead acetate. Natural antibodies (natural heteroagglutinins were also quantified against SRBC. Both assessments were carried out employing an ELISA method developed to this end, measuring absorbance (A. For natural anti-SRBC antibodies in both control (C and Pb treated (T toads, there was a non significant tendency to increase the initial absorbances (C initial: 0.69±0.39 A; T initial: 0.54±0.30 A, relative to those registered at the end of the experiments (C final: 0.89±0.49 A; T final: 0.76±0.31A; the T/C ratios also did not show changes. The only significant difference was found between initial and final samples from lead-treated toads (pExiste evidencia de que los niveles de metal ambientales afectan la función inmune. En el caso particular del impacto de metales pesados, la información disponible sugiere que el sistema inmune es un blanco para la exposición a bajas dosis de Pb. Entre los vertebrados, se ha mostrado que los anfibios son capaces de formar anticuerpos contra una variedad de antígenos, que causan diversas respuestas, tales como respuesta anafiláctica y rechazo de injertos. En este estudio, la producción de anticuerpos fue evaluada contra eritrocitos de oveja (EO en el anuro Bufo arenarum, luego de seis inyecciones semanales de dosis subletales de plomo (50 mg.kg-1, como acetato de Pb. Los anticuerpos naturales

Recurrent Mastoiditis Mimics IgG4 Related Disease: A Potential Diagnostic Pitfall.

Science.gov (United States)

Deshpande, Vikram; Zane, Nicolas A; Kraft, Stefan; Stone, John H; Faquin, William C

2016-09-01

IgG4-related disease (IgG4-RD) is a recently recognized entity that causes progressive fibrosis and formation of mass lesions. IgG4-RD can be diagnosed histologically by its hallmarks of storiform fibrosis, prominent lymphoplasmacytic infiltrate, and obliterative phlebitis, accompanied by the infiltration of excessive numbers of IgG4-positive plasma cells as well as elevations in serum IgG4 concentrations. A recent publication reported a case of IgG4-RD in the mastoid sinus, representing a new anatomic location for this disease. We report two additional cases of IgG4-RD occurring in the mastoid and causing clinical mastoiditis. The presenting symptoms were varied-tinnitus, hearing loss, and cranial nerve palsies. All three cases showed a dense lymphoplasmacytic infiltrate, storiform type fibrosis as well as elevated numbers of IgG4 positive plasma cells. The three patients responded to immunosuppressive therapy that included steroids and Rituximab. We further investigated 162 consecutive mastoiditis cases at our institution in order to determine the frequency of IgG4-RD as a previously unrecognized cause of mastoiditis. Within this latter cohort we identified nine cases of mastoiditis that had two of the histologic features of IgG4-RD, specifically storiform fibrosis and a dense lymphoplasmacytic infiltrate. Two of these cases showed >50 IgG4-positive plasma cells per high-power field with IgG4-IgG ratio of >40 %, thus fulfilling histological criteria for IgG4-RD. However, both were due to severe acute or chronic infection. In conclusion, we reaffirm IgG4 related mastoiditis as a distinct but uncommon cause of recurrent mastoiditis. The diagnosis of IgG4-related mastoiditis should be rendered with caution, and only after the exclusion of potential mimickers, particularly infection.

Inhibition of complement activation by IgG4 antibodies

NARCIS (Netherlands)

van der Zee, J. S.; van Swieten, P.; Aalberse, R. C.

1986-01-01

Prolonged exposure to antigens may result in high IgG4 antibody titres as was shown in a previous paper (Aalberse et al., 1983b). In novice bee keepers, a shift in the IgG1/IgG4 ratio of the response against phospholipase-A (PLA; a major component of bee venom) occurred. This resulted in an

Hybrid IgG4/IgG4 Fc antibodies form upon 'Fab-arm' exchange as demonstrated by SDS-PAGE or size-exclusion chromatography

NARCIS (Netherlands)

Rispens, Theo; den Bleker, Tamara H.; Aalberse, Rob C.

2010-01-01

Human IgG4 antibodies are dynamic molecules that in vivo exchange half-molecules to become bispecific antibodies. Here we show that IgG4 antibodies and IgG4 Fc fragments similarly exchange resulting in hybrid antibodies (a single Fab + Fc) with a molecular weight of ca. 100 kDa. These antibodies can

Structural characterization of the Man5 glycoform of human IgG3 Fc

Energy Technology Data Exchange (ETDEWEB)

Shah, Ishan S.; Lovell, Scott; Mehzabeen, Nurjahan; Battaile, Kevin P.; Tolbert, Thomas J. (Kansas); (HWMRI)

2017-12-01

Immunoglobulin G (IgG) consists of four subclasses in humans: IgG1, IgG2, IgG3 and IgG4, which are highly conserved but have unique differences that result in subclass-specific effector functions. Though IgG1 is the most extensively studied IgG subclass, study of other subclasses is important to understand overall immune function and for development of new therapeutics. When compared to IgG1, IgG3 exhibits a similar binding profile to Fcγ receptors and stronger activation of complement. All IgG subclasses are glycosylated at N297, which is required for Fcγ receptor and C1q complement binding as well as maintaining optimal Fc conformation. We have determined the crystal structure of homogenously glycosylated human IgG3 Fc with a GlcNAc2Man5 (Man5) high mannose glycoform at 1.8 Å resolution and compared its structural features with published structures from the other IgG subclasses. Although the overall structure of IgG3 Fc is similar to that of other subclasses, some structural perturbations based on sequence differences were revealed. For instance, the presence of R435 in IgG3 (and H435 in the other IgG subclasses) has been implicated to result in IgG3-specific properties related to binding to protein A, protein G and the neonatal Fc receptor (FcRn). The IgG3 Fc structure helps to explain some of these differences. Additionally, protein-glycan contacts observed in the crystal structure appear to correlate with IgG3 affinity for Fcγ receptors as shown by binding studies with IgG3 Fc glycoforms. Finally, this IgG3 Fc structure provides a template for further studies aimed at engineering the Fc for specific gain of function.

Factores de riesgo asociados a la seroprevalencia de anticuerpos a Neospora caninum en ganado lechero de Aguascalientes, México

OpenAIRE

Rocío Conzuelo Sierra; Leticia Medina-Esparza; Miguel Ramos Parra; Zeferino García-Vázquez; Carlos Cruz-Vázquez

2011-01-01

El objetivo del presente trabajo fue identificar potenciales factores de riesgo, incluyendo laposible presencia de contaminación del agua de bebida con ooquistes del parásito, asociados con la seroprevalencia de anticuerpos a N. caninum en hatos lecheros de Aguascalientes, México. Se tomaron muestras de suero sanguíneo de 150 vacas, mismas que fueron analizadas por la técnica de ELISA, se detectó la presencia de ADN de N. caninum en el agua de bebida mediante una prueba de PCR anidada, y se a...

Invasive cervical cancer accompanied by IgG4-related disease.

Science.gov (United States)

Mizuno, Rin; Yamanishi, Yukio; Uda, Satoko; Terashima, Tsuyoshi; Higashi, Tatsuya; Higuchi, Toshihiro

2016-09-01

IgG4-related disease (IgG4-RD) is a systemic disease that affects multiple organs and generates nodules or thickening. Discriminating these diseases from malignancy is important because glucocorticoid treatment is effective for patients with IgG4-RD. Coexistence of IgG4-RD with various malignant diseases has been reported, but there are few reports with regard to gynecologic malignant diseases. We encountered a case of invasive cervical cancer stage IIB accompanied by IgG4-RD. The patient was a 46-year-old woman. On pelvic magnetic resonance imaging, fluorodeoxyglucose-positron emission tomography and computed tomography, systemic multiple lymph node swelling was seen, including in the neck and the mediastinum in addition to uterine cervix. Diagnosis (and hence, appropriate treatment choice) was achieved on pathology of the submandibular gland and uterus, and analysis of serum IgG4. IgG4-RD should be suspected in patients presenting with malignancy and unusual multiple lymph node swelling. © 2016 Japan Society of Obstetrics and Gynecology.

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.

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. © The Japanese Society for Immunology. 2015. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

IgG isotypic antibodies to crude Plasmodium falciparum blood-stage ...

African Journals Online (AJOL)

Methods: Levels of IgG (IgG1-IgG4) and IgM to crude P. falciparum blood stage antigen ... dosage influenced P. falciparum-specific isotypic antibody responses to blood stage .... exposed Swedish donors. ..... with adverse pregnancy outcomes.

IgG4- related disease: an orphan disease with many faces

Science.gov (United States)

2014-01-01

Immunoglobulin G4- related disease (IgG4-RD) is a rare systemic fibro-inflammatory disorder (ORPHA284264). Although patients have been described more than 100 years ago, the systemic nature of this disease has been recognized in the 21st century only. Type 1 autoimmune pancreatitis is the most frequent manifestation of IgG4-RD. However, IgG4-RD can affect any organ such as salivary glands, orbits, retroperitoneum and many others. Recent research enabled a clear clinical and histopathological description of IgG4-RD. Typically, lymphoplasmacellular inflammation, storiform fibrosis and obliterative phlebitis are found in IgG4-RD biopsies and the tissue invading plasma cells largely produce IgG4. Elevated serum IgG4 levels are found in many but not all patients. Consequently, diagnostic criteria for IgG4-RD have been proposed recently. Treatment is largely based on clinical experience and retrospective case series. Glucocorticoids are the mainstay of therapy, although adjunctive immunosuppressive agents are used in relapsing patients. This review summarizes current knowledge on clinical manifestations, pathophysiology and treatment of IgG4-RD. PMID:25026959

Large vessel involvement by IgG4-related disease

Science.gov (United States)

Perugino, Cory A.; Wallace, Zachary S.; Meyersohn, Nandini; Oliveira, George; Stone, James R.; Stone, John H.

2016-01-01

Abstract Objectives: IgG4-related disease (IgG4-RD) is an immune-mediated fibroinflammatory condition that can affect multiple organs and lead to tumefactive, tissue-destructive lesions. Reports have described inflammatory aortitis and periaortitis, the latter in the setting of retroperitoneal fibrosis (RPF), but have not distinguished adequately between these 2 manifestations. The frequency, radiologic features, and response of vascular complications to B cell depletion remain poorly defined. We describe the clinical features, radiology findings, and treatment response in a cohort of 36 patients with IgG4-RD affecting large blood vessels. Methods: Clinical records of all patients diagnosed with IgG4-RD in our center were reviewed. All radiologic studies were reviewed. We distinguished between primary large blood vessel inflammation and secondary vascular involvement. Primary involvement was defined as inflammation in the blood vessel wall as a principal focus of disease. Secondary vascular involvement was defined as disease caused by the effects of adjacent inflammation on the blood vessel wall. Results: Of the 160 IgG4-RD patients in this cohort, 36 (22.5%) had large-vessel involvement. The mean age at disease onset of the patients with large-vessel IgG4-RD was 54.6 years. Twenty-eight patients (78%) were male and 8 (22%) were female. Thirteen patients (36%) had primary IgG4-related vasculitis and aortitis with aneurysm formation comprised the most common manifestation. This affected 5.6% of the entire IgG4-RD cohort and was observed in the thoracic aorta in 8 patients, the abdominal aorta in 4, and both the thoracic and abdominal aorta in 3. Three of these aneurysms were complicated by aortic dissection or contained perforation. Periaortitis secondary to RPF accounted for 27 of 29 patients (93%) of secondary vascular involvement by IgG4-RD. Only 5 patients demonstrated evidence of both primary and secondary blood vessel involvement. Of those treated with

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.

Produção e caracterização de anticorpos monoclonais contra toxina épsilon de Clostridium perfringens Tipo D Production and characterization of monoclonal antibodies against Clostridium perfringens Type D epsilon toxin

Directory of Open Access Journals (Sweden)

Theonys Diógenes Freitas

2009-02-01

Full Text Available Clostridium perfringens tipo D é o agente etiológico da enterotoxemia em ruminantes, causada pela toxina épsilon e caracterizada por edema cardíaco, pulmonar, renal e cerebral. Anticorpos monoclonais contra toxina épsilon de C. perfringens tipo D foram produzidos a partir da fusão da linhagen de mieloma P3-X63-Ag8 653 com células do baço de camundongos Balb/c imunizados com o toxóide épsilon. Seis linhagens de híbridos secretores de anticorpos monoclonais das classes e IgM e IgG foram estabelecidas.Clostridium perfringens type D is the aetiological agent of enterotoxemia in ruminants. The disease is caused by epsilon toxin characterized by cardiac, pulmonary, kidney and brain edema. Monoclonal antibodies were produced by using myeloma cell line P3-X63-Ag8 653 fused with spleen cells from Balb/c mice, immunized with epsilon toxoid of C. perfringens type D. Six hybrids were established secreting monoclonal antibodies of the IgM class and IgG3 subclass.

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

Directory of Open Access Journals (Sweden)

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.

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.

Clinical pathology observation on orbit IgG4 related disease

Directory of Open Access Journals (Sweden)

Ji-Hua Guo

2015-09-01

Full Text Available AIM:To discuss clinical pathological features of orbit IgG4 related disease(IgG4-RD. METHODS: The clinical pathological materials of 23 patients(35 eyeswith orbit IgG4-RD were collected. They were observed in terms of histology and immunohistochemistry, and its clinical and pathologic characteristics were summarized. RESULTS: There were 23 patients(35 eyeswith orbit IgG4-RD(8 male patients, 9 eyes; 15 female patients, 26 eyes, with an average age of 52.1 year-old(from age 28 to 72. 19 patients(30 eyesoccured in lacrimal gland and 4 cases(5 eyesin other places, and they went to hospital for lacrimal gland cyst or exophthalmos. There were 11 cases in one side and 12 cases in both sides. The disease lasted from 1mo to 10a, averaging 27mo. It recureded in one patient(1 eyeafter 1mo. In general inspection: Gray nodular goiter, thin fibrous coat wrapping around the lacrimal gland could be observed. Histologic characteristics: lacrimal gland bubble and catheter group shrinked or even disappeared, substituted by lymphocyte, plasma cells and lymphoid follicle and accompanied with fibrosis. Immunohistochemical staining: IgG4 positive plasma cells of 23 cases(35 eyeswas >50/HPF, and IgG4/IgG ratio of positive plasma cells was >40%. CONCLUSION: Orbit IgG4-RD mainly occures in lacrimal gland tissue, and expression of IgG4 can be detected through histologic characteristics and immunohistochemical staining. IgG4-RD should be screened, prevented and treated in the early phase.

[IgG4-related disease - a case report].

Science.gov (United States)

Milczarek-Banach, Justyna; Brodzińska, Kinga; Jankowska, Anna; Ambroziak, Urszula; Szczepankiewicz, Benedykt; Nałęcz-Janik, Jolanta; Miśkiewicz, Piotr

2017-09-29

Immunoglobulin G4-related disease (IgG4-RD) is a comparatively new condition that may involve more than one organ. The lack of characteristic, pathognomonic clinical symptoms may delay the diagnosis of this disease. The diagnosis is based upon clinical manifestation, elevated serum levels of IgG4 and histopathologic examination with immunohistochemical staining to reveal infiltration of IgG4-positive plasma cells. The first line treatment is oral glucocorticoids. 38-year-old woman with Hashimoto disease, chronic sinusitis and chronic hepatitis of unknown etiology was admitted to the Department of Endocrinology because of moderate eyelids swelling accompanied by redness for 3 years. Graves' orbitopathy and systemic vasculitis were suspected, however both were excluded (negative antibodies results: anty-TSHR, ANCA, ANA). Serologic investigation of Sjögren's syndrome was also negative. In Magnetic Resonance Imaging (MRI) of orbits there were described bilateral mild extension of lateral rectus muscles, normal signal of adipose tissue and bilateral lacrimal glands enlargement. Moreover, increased IgG4 serum levels were detected. The material derived from perinasal sinuses surgery was analyzed in histopathology examination with immunohistochemical staining, which revealed characteristic features of chronic inflammatory process and increased numbers of IgG4 - positive plasma cells (>50 in a large field of view). The diagnosis of IgG4-RD was established. Because of non-effective oral methylprednisolone therapy in the past, the patient was referred to Clinic of Rheumatology for further treatment. After the therapy with methylprednisolone and azathioprine there were observed the significant reduction of symptoms. Because of lack of characteristic symptoms of IgG4- RD, it should be always considered in differential diagnosis of chronic inflammatory diseases of various organs.

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

IgE were detected using 125I-labelled rBet v 1.2801, a recombinant variant of the major allergen of Betula verrucosa pollen. Results show that IgG4-depletion resulted in equivalent reductions in binding and blocking activities. In contrast, a significant but less than two-fold higher relative...... for the clinical efficacy of SIT. In this study, fractionated serum samples from 14 SIT-treated birch pollen allergic individuals enabled determination of the inhibitory capacity of IgG4 alone versus non-IgG4 IgG. Allergen-binding activities of IgG and the IgG-mediated inhibition of allergen binding to autologous...

Prevalence of mild serum vitamin B12 deficiency in rural and urban Costa Rican young adults Prevalencia de la deficiencia moderada de vitamina B12 sérica en jóvenes adultos de zonas rurales y urbanas de Costa Rica

Directory of Open Access Journals (Sweden)

Ileana Holst-Schumacher

2007-12-01

realizó un estudio transversal para determinar los niveles de vitamina B12 en el suero de 400 adultos de 20 a 40 años de edad de zonas urbanas y rurales del valle central de Costa Rica. Adicionalmente, se estudió la ingesta de cobalamina en la dieta y la presencia de anticuerpos IgG contra Helicobacter pylori, como posibles factores determinantes de las concentraciones séricas de vitamina B12. RESULTADOS: La concentración media de vitamina B12 en el suero fue de 268 ± 125 pmol/L; no se encontraron diferencias significativas entre los sexos ni entre las áreas de residencia. Estos datos demostraron una prevalencia general de niveles insuficientes de cobalamina sérica de 42,4% (11,2% con déficit y 31,2% con concentraciones marginales; de las personas estudiadas más de 50% -aunque menos de 75%- tenían una ingesta de vitamina B12 por debajo del valor de las necesidades promedio estimadas para los Estados Unidos de América y 61,2% tenía anticuerpos contra H. pylori. CONCLUSIONES: La prevalencia de deficiencia moderada de vitamina B12 sérica en jóvenes costarricenses es tan elevada como en otros países latinoamericanos. Se necesitan más investigaciones para aclarar los factores etiológicos que producen niveles insuficientes y marginales de cobalamina sérica en los adultos de Costa Rica para poder definir intervenciones sanitarias apropiadas.

Rugas glabelares: estudo piloto dos padrões de contração

OpenAIRE

Ada Regina Trindade de Almeida; Elisa Raquel Martins da Costa Marques; Bogdana Victoria Kadunc

2010-01-01

Introdução: A atividade muscular nd glabela Provocação rugas perpendiculares à Direção decontração dos Músculos, hoje tratadas Pela toxina botulínica.Variações interpessoais nd forma de contração local, São exibidas Durante a Animação facial. Apesar dos Inúmeros artigos publicados Sobre o tema, Os padrões de contração glabelar Ainda Não Foram estudados adequadamente e Classificados. Objetivo: Identificar e classificar Os padrões de contração glabelar encontrados Na população Que recebe Tratam...

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

Science.gov (United States)

Buelli, Simona; Perico, Luca; Galbusera, Miriam; Abbate, Mauro; Morigi, Marina; Novelli, Rubina; Gagliardini, Elena; Tentori, Chiara; Rottoli, Daniela; Sabadini, Ettore; Saito, Takao; Kawano, Mitsuhiro; Saeki, Takako; Zoja, Carlamaria; Remuzzi, Giuseppe; Benigni, Ariela

2015-01-01

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. PMID:26137589

Una aproximación al concepto de crímenes contra la humanidad

Directory of Open Access Journals (Sweden)

José Manuel Díaz Soto

2012-12-01

Full Text Available El presente artículo explora el concepto de “crímenes contra la humanidad”, a partir de una revisión histórica y del análisis de los distintos instrumentos internacionales que han consagrado esta categoría normativa. De igual modo, pretende ilustrar al lector acerca de la teoría de los crímenes contra la humanidad formulada por el profesor de la Universidad de Georgetown David J. Luban, para quien el rasgo definidor de estos delitos es que atentan contra la naturaleza política del ser humano. Por último, se destaca la influencia del pensamiento de Luban en la reciente jurisprudencia de la Corte Suprema de Justicia de Colombia acerca de los crímenes contra la humanidad.

IgG levels in mother-father-cord trios: evidence for a large reduction of maternal IgG at birth

Energy Technology Data Exchange (ETDEWEB)

Williams, R C; Gershowitz, H

1979-01-01

Cord plasmas have a higher concentration of IgG than do the mothers, although autologous, fetal immunoglobulin G is only a small fraction of the neonate's complement. Maternal IgG levels are significantly lower than the nonpregnant adult female, a loss of about one third, which cannot be explained completely by maternal immunization of the fetus.

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

Directory of Open Access Journals (Sweden)

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.

Enhanced IgG4 production by follicular helper 2 T cells and the involvement of follicular helper 1 T cells in the pathogenesis of IgG4-related disease.

Science.gov (United States)

Akiyama, Mitsuhiro; Yasuoka, Hidekata; Yamaoka, Kunihiro; Suzuki, Katsuya; Kaneko, Yuko; Kondo, Harumi; Kassai, Yoshiaki; Koga, Keiko; Miyazaki, Takahiro; Morita, Rimpei; Yoshimura, Akihiko; Takeuchi, Tsutomu

2016-07-13

The aim of this study was to elucidate the function of circulating follicular helper T (Tfh) cell subsets in helping B cells in patients with active, untreated IgG4-related disease (IgG4-RD) and determine their relationship with disease activity. Seventeen consecutive patients with active, untreated IgG4-RD, 20 with primary Sjögren syndrome (pSS), 5 with multicentric Castleman's disease (MCD), and 12 healthy controls (HC) were enrolled. Tfh cell subset function was evaluated by co-culture with naïve B cells in vitro. Activated Tfh cell subsets were defined as a CCR7(low)PD-1(high) subset among Tfh cell subsets. Disease activity was evaluated by IgG4-RD responder index (IgG4-RD RI) score. The number of Tfh2 cells was significantly higher in IgG4-RD compared to pSS, MCD, or HC, and correlated with serum IgG4 level or the number of plasmablasts. In vitro, Tfh2 cells more efficiently induced the differentiation of naïve B cells into plasmablasts compared to Tfh1 or Tfh17 cells. Of note, while IgG production in culture supernatants of Tfh2 cells was comparable between IgG4-RD and HC, IgG4 production was significantly higher with Tfh2 cells from patients with IgG4-RD than in those from HC. Accordingly, the IgG4:IgG ratio in culture supernatants was also significantly higher with Tfh2 cells from IgG4-RD compared to HC. Moreover, the number of activated Tfh2 cells was higher in IgG4-RD compared to pSS, MCD, or HC, and strongly correlated with IgG4-RD RI score in the baseline active phase. Particularly, the number of activated Tfh2 cells was associated with the number of affected organs and serum IgG4 level. Importantly, the number of activated Tfh2 cells was decreased after glucocorticoid treatment and paralleled disease improvement. Moreover, the number of activated Tfh1 cells was also increased in IgG4-RD compared to pSS, MCD, or HC, correlating with IgG4-RD RI score, but not with serum IgG4 level. Tfh2 cells, but not Tfh1 or Tfh17 cells, induce the differentiation of

The Geoepidemiology and Clinical Aspects of IgG4-Related Disease.

Science.gov (United States)

Uchida, Kazushige; Tanaka, Toshihiro; Gershwin, M Eric; Okazaki, Kazuichi

2016-08-01

Immunoglobulin G4-related disease (IgG4-RD) is a recently described systemic inflammatory disease characterized by increased serum IgG4 concentrations, lymphoplasmacytic infiltrations, storiform fibrosis, and obliterative phlebitis. However, although IgG4-RD has become increasingly recognized, the number of patients with IgG4-RD remains unclear. Data from several studies indicate that patients who have a T-helper type 2 (Th2-) dominant immune response, which leads to the hyperproduction of Th2 cytokines, then progress to IgG4-RD. Glucocorticoids are the most common treatment for IgG4-RD and generally, patients have a good response-a characteristic of IgG4-RD. However, relapses during the tapering of glucocorticoid therapy are common. Second-line therapy after glucocorticoids includes immunosuppressant agents. Although the long-term outcome still remains unclear, there is increased interest in the relationships between IgG-RD and malignancies. In this review, the authors provide a detailed overview of the geoepidemiology, pathogenesis, diagnostic features, treatment, and prognosis of IgG4-RD. Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

The Emerging Importance of IgG Fab Glycosylation in Immunity

NARCIS (Netherlands)

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

2016-01-01

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

Primary and booster vaccination with DTPw-HB/Hib pentavalent vaccine in Costa Rican children who had received a birth dose of hepatitis B vaccine Vacunación primaria y de refuerzo con la vacuna pentavalente DTPw-HB/Hib en niños costarricenses vacunados al nacer contra la hepatitis B

Directory of Open Access Journals (Sweden)

Idis Faingezicht

2002-10-01

protective/seropositive titers for Hib, HB, and tetanus and about 50% for diphtheria and Bordetella pertussis. At 15 months of age, virtually all the toddlers responded with a strong boost response to all the vaccine antigens, whether they received the DTPw-HB/Hib pentavalent vaccine or the DTPw/Hib vaccine as a booster. Both booster regimens were equally well tolerated, indicating that up to five doses of the HB vaccine can be given without impact on safety. Conclusions. Our study confirms that the DTPw-HB/Hib pentavalent vaccine is highly immunogenic as a primary vaccination in children who received an HB vaccine at birth, with the pentavalent combination inducing both persisting immunity and boostable memory. The pentavalent vaccine was safe both for primary and booster vaccinations. Thus, this study in Costa Rican infants supports the routine use of the pentavalent DTPw-HB/Hib vaccine as part of childhood vaccination programs in Latin America and the Caribbean.Objetivos. La vacuna combinada pentavalente DTPw-HB/Hib ha sido creada siguiendo la recomendación de la Organización Mundial de la Salud de añadir las vacunas contra la hepatitis b (HB y el Haemophilus influenzae tipo b (Hib a los programas de vacunación infantil. Los objetivos del presente estudio consistieron en: 1 analizar la inmunogenicidad y reactogenicidad de la vacuna combinada pentavalente DTPw-HB/Hib en comparación con las inyecciones separadas de las vacunas DTPw-HB e Hib como vacunación primaria en un grupo de niños que habían recibido al nacer una dosis de vacuna contra la HB, y 2 evaluar la persistencia de anticuerpos en el segundo año de vida, así como la respuesta a las dosis de recuerdo de DTPw-HB/Hib o DTPw/Hib. Métodos. En la primera parte del estudio (fase de vacunación primaria, realizada en 1998-1999, se analizó la inmunogenicidad y reactogenicidad de la vacuna combinada DTPw-HB/Hib en comparación con inyecciones separadas de las vacunas DTPw-HB e Hib como vacunación primaria a

Desarrollo de agentes inmunizantes contra el dengue

Directory of Open Access Journals (Sweden)

Francisco J. López Antuñano

2000-05-01

Full Text Available El complejo de los cuatro flavivirus del dengue es transmitido principalmente por el mosquito Aedes aegypti. Se han atribuido epidemias a la actividad de A. albopictus, A. polynesiensis y a varias especies del complejo A. scutellaris. Los factores de riesgo que determinan la probabilidad de enfermar o morir por dengue están relacionados tanto con el huésped (características genéticas, estado inmunitario, forma de vida y condiciones de salud, saneamiento básico de la vivienda y abastecimiento de agua potable como con el virus (variabilidad genética de cepas entre y dentro de los serotipos, diferente capacidad patógena y distribución geográfica. A pesar de la falta de conocimiento sobre la inmunobiopatología del dengue, se han hecho importantes avances para conseguir una respuesta inmunitaria protectora con virus atenuados y con antígenos obtenidos por medio de tecnologías recombinantes. Desde los años 40, se ha intentado desarrollar vacunas contra el dengue. La inmunidad que se adquiere por infección natural es específica para cada serotipo y se han documentado infecciones por tres serotipos diferentes en la misma persona, por lo que probablemente sea necesaria una vacuna tetravalente. En voluntarios se han probado vacunas contra los cuatro serotipos que han sido inmunógenas y seguras. Aunque las vacunas con virus atenuados son prometedoras, son necesarios nuevos estudios sobre su eficacia y seguridad. Actualmente están en curso estudios para producir vacunas contra el virus del dengue mediante tecnologías de ADN recombinante y otras técnicas de biología molecular, utilizando como antígenos proteínas estructurales (principalmente la glicoproteína E y no estructurales. Con el mismo propósito se han usado varios vectores de expresión, como Escherichia coli, baculovirus, virus de la vacuna y virus de la fiebre amarilla. Lamentablemente, no se han obtenido resultados satisfactorios en el hombre. La necesidad de desarrollar

La violencia sexual como un atentado contra la dignidad de la mujer

OpenAIRE

Gil Millan, Maximiliana

2015-01-01

La violencia sexual contra la mujer es la manifestación extrema de la desigualdad y del sometimiento en el que viven las mujeres en el mundo. Constituye un atentado contra el derecho a la vida, a la libertad, y la dignidad de las mujeres. Por tanto, para

Anticuerpos antiprotrombina y resistencia adquirida a la proteína C activada en el síndrome antifosfolipídico

OpenAIRE

Muñoz Rodríguez, Francisco José

2003-01-01

El síndrome antifosfolipídico (SAF) se caracteriza clínicamente por la aparición de fenómenos trombóticos recurrentes, complicaciones obstétricas, tales como abortos o pérdidas fetales recurrentes, y trombocitopenia. Inmunológicamente se define por la presencia de los anticuerpos antifosfolipídicos (AAF), un grupo heterogéneo de autoanticuerpos que reconocen complejos constituidos por fosfolípidos de membrana y proteínas plasmáticas que actúan como cofactores. Los mejor conocidos y que ayudan...

The role of IgG antibodies in allergy and immunotherapy

NARCIS (Netherlands)

Aalberse, R.

2011-01-01

In specific immunotherapy (SIT), a beneficial response is associated with an increase in allergen-specific IgG(4) . This does not indicate that IgE-producing B cells have switched to IgG(4) production, because in human DNA, IgE is downstream from IgG(4) . Thus, by conventional switching, B cells

SEROLOGICAL EVIDENCE OF THE PRESENCE OF CANINE HERPES VIRUS TYPE 1 IN LIMA PROVINCE

OpenAIRE

Góngora A., Vladimir; Sandoval Ch., Nieves; Manchego S., Alberto

2012-01-01

El Virus Herpes Canino tipo 1 (VHC-1) es responsable de la enfermedad hemorrágica canina en cachorros menores de cuatro semanas de vida y de algunos problemas reproductivos en perras adultas. En el Perú, la enfermedad no ha sido reportada, aunque existen hallazgos que sugieren su presencia. El objetivo del presente estudio fue demostrar la presencia de anticuerpos contra el VHC-1 entre la población canina con antecedentes asociados a problemas reproductivos. Se recolectaron muestras de sangre...

Producción y caracterización de anticuerpos monoclonales frente a albúmina humana : Aplicación al estudio de la estructura antigénica de esta proteina

OpenAIRE

García Pacheco, José Marcos

2011-01-01

Se han producido 10 anticuerpos monoclonales frente a albúmina humana, los cuales reconocen 6 epitopos de naturaleza conformacional sobre la superficie de la albúmina de esta molécula, habiéndose detectado diferencias antagónicas entre albúmina humana de diferente procedencia.

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

Directory of Open Access Journals (Sweden)

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

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.

Producción de la proteína de choque térmico HSC70 Recombinante en Escherichia Coli BL21 (DE3 para generar anticuerpos policlonales

Directory of Open Access Journals (Sweden)

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.

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

Directory of Open Access Journals (Sweden)

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

Vacuna Sintética contra la Malaria

Directory of Open Access Journals (Sweden)

Manuel Elkin Patarroyo

1993-12-01

í adelantaron las pruebas en micos Aotus los últimos trece años.

Basados en las enseñanzas del doctor Bruce Merrifield, se hizo la síntesis de una gran cantidad de pedacitos de esas moléculas para averiguar cuáles servían para ser vacunas y de ahí en adelante siempre han seguido trabajando en función del desarrollo de una vacuna químicamente obtenida, nunca jamás volvieron a trabajar con un producto biológico sino con moléculas químicamente hechas de acuerdo a la estructura química.

Luego volvieron al Amazonas a continuar las investigaciones y se dieron cuenta después, de los resultados del primer estudio, que no podían obtener una vacuna que contuviese sólo un pedazo de una proteína y también se dieron cuenta que iba a haber un control genético en la respuesta inmunitaria puesto que unos monitos se infectaban más rápido que otros y unos postergaban su aparición.

Comenta luego el doctor Patarroyo que lo que hicieron a continuación fue efectuar la síntesis química de todas las móleculas y averiguar cuáles de esos pedacitos eran reconocidos por los anticuerpos de los individuos que hubieran tenido malaria o por los glóbulos blancos de los que hubieran tenido malaria o cuáles de ellos eran capaces de inducir algún tipo de respuesta protectora en los monos y fueron comprobados contra un panel de 20 sueros y glóbulos blancos de individuos que hubiesen tenido malaria comparándolos con 20 pacientes que no hubiesen tenido malaria.

Una vez identificados los fragmentos más inmunogénicos se vacunaron nuevamente monitos con mezclas de estos tres fragmentos y se retaron con glóbulos rojos infectados con P. {alciparum, y se obtuvo teniendo así la primera evidencia de que se podría hacer una vacuna química. Posterior a esta evidencia se les ocurrió crear una molécula híbrida tomando los pedazos de varias moléculas que habían sido considerados como importantes resultando así la molécula que es la vacuna actual contra la

IgG and IgE antibodies to Chironomidae in asthmatic patients.

Science.gov (United States)

Yamashita, N; Ito, K; Nakagawa, T; Haida, M; Okudaira, H; Nakada, S; Miyamoto, T; Shibuya, T; Kamei, K; Sasa, M

1987-01-01

IgG antibodies to Chironomidae and its correlations to radioallergosorbent and skin reactions were examined with the aim of clarifying the relationship between asthma and Chironomidae. The level of specific IgG antibody in asthmatic patients (0.698 +/- 0.034, n = 104) was significantly greater than that in normal subjects (0.367 +/- 0.032, n = 52) (P less than 0.01). The specific IgG level was not correlated to skin reaction, nor to IgE RAST scores. Specific IgG1 and IgG4 levels in asthmatic patients were significantly greater than in control subjects (n = 14) (P less than 0.01). Images Fig. 5 PMID:3652516

Ave sol contra excrementum : Kiri / Harri Tibar

Index Scriptorium Estoniae

Tibar, Harri

1996-01-01

Peeter Sauteri novell 'Kõhuvalu'. Vastukaja : Bogovski, Paul. Surun kätt, dotsent hr. Tibar! // Sõnumileht. - 1996. - 24. apr. - Lk.14; Väljataga, Märt. Viisipärasus contra inimlähedus // Sõnumileht. - 1996. - 26. apr. - Lk.14

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.

Retroperitoneal disorders associated with IgG4-related autoimmune pancreatitis

Science.gov (United States)

Hara, Noboru; Kawaguchi, Makoto; Takeda, Keisuke; Zen, Yoh

2014-01-01

IgG4-related autoimmune pancreatitis is frequently accompanied by relevant lesions in the genitourinary tract and retroperitoneal organs, which cause various clinical problems, ranging from non-specific back pain or bladder outlet obstruction to renal failure. The diagnosis of IgG4-related retroperitoneal fibrosis requires a multidisciplinary approach, including serological tests, histological examination, imaging analysis, and susceptibility to steroid therapy. Radiological examinations are helpful to diagnose this condition, but surgical resection is occasionally unavoidable to exclude malignancy, particularly for patients with isolated retroperitoneal involvement. Steroid therapy is the treatment of choice for this condition, the same as for other manifestations of IgG4-related disease. For patients with severe ureteral obstruction, additional ureteral stenting needs to be considered prior to steroid therapy to preserve the renal function. Some papers have suggested that IgG4-related disease can affect male reproductive organs including the prostate and testis. IgG4-related prostatitis usually causes lower urinary tract symptoms, such as dysuria and pollakisuria. Patients sometimes state that corticosteroids given for IgG4-related disease at other sites relieve their lower urinary tract symptoms, which leads us to suspect prostatic involvement in this condition. Because of the limited number of publications available, further studies are warranted to better characterize IgG4-related disease in male reproductive organs. PMID:25469023

A Two-pronged Binding Mechanism of IgG to the Neonatal Fc Receptor Controls Complex Stability and IgG Serum Half-life

DEFF Research Database (Denmark)

Jensen, Pernille Foged; Schoch, Angela; Larraillet, Vincent

2017-01-01

The success of recombinant monoclonal immunoglobulins (IgG) is rooted in their ability to target distinct antigens with high affinity combined with an extraordinarily long serum half-life, typically around 3 weeks. The pharmacokinetics of IgGs is intimately linked to the recycling mechanism...... half-life of ∼8 days. Here we dissect the molecular origins of excessive FcRn binding in therapeutic IgGs using a combination of hydrogen/deuterium exchange mass spectrometry and FcRn affinity chromatography. We provide experimental evidence for a two-pronged IgG-FcRn binding mechanism involving direct...

La persecución jurídica contra Prisciliano

OpenAIRE

Bravo Bosch, María José

2009-01-01

En este trabajo analizamos los motivos reales para encausar a Prisciliano, y la legalidad del proceso llevado a cabo contra el obispo de Ávila, por el que fue condenado a pena de muerte en un proceso civil, extraño a la condición eclesiástica de Prisciliano. La conclusión es que el proceso fue legal desde el punto de vista formal, pero no los motivos que se adujeron para llegar a la pena máxima contra el célebre reo. In this paper we analyze the real reasons to prosecute Prisciliano, and l...

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.

Extrapancreatic findings of IgG4-related disease

International Nuclear Information System (INIS)

Tan, T.J.; Ng, Y.L.; Tan, D.; Fong, W.S.; Low, A.S.C.

2014-01-01

IgG4-related disease is a systemic fibro-inflammatory condition, which includes autoimmune pancreatitis as part of the disease spectrum. Imaging has been demonstrated to play a major role in the diagnosis of autoimmune pancreatitis. Recognizing the wide spectrum of extrapancreatic manifestations of IgG4-related disease coupled with a high clinical index of suspicion will allow for an accurate and timely diagnosis to be made, thus avoiding unnecessary invasive procedures and ensuring that early effective corticosteroid therapy is commenced. This review aims to serve as a concise reference tool for both clinicians and radiologists in the diagnosis of extrapancreatic IgG4-related disease

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.

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.

IgG subclass reactivity to Trypanosoma cruzi in chronic chagasic patients.

Science.gov (United States)

Hernández-Becerril, N; Nava, A; Reyes, P A; Monteón, V M

2001-01-01

The anti-Trypanosoma cruzi antibodies isotype profile in Chagas' disease has been studied in relation to different clinical manifestations. A high titer of IgG anti-T. cruzi antibodies is found in patients with cardiac involvement, while a high titer of IgA anti-T. cruzi antibodies is associated with digestive forms. The aim of this work was to analyze the IgG subclass reactivity of anti-T. cruzi antibodies in patients with chronic Chagasic cardiomyopathy. Twelve consecutive chagasic patients were analyzed for IgG subclass reactivity to a T. cruzi antigenic extract. They had a complete clinical evaluation, peripheral EKG, echocardiography, left ventriculogram, and coronariography. All patients came from rural areas of Mexico and had lived in endemic zones for over seven years. They presented left ventricular endsystolic dimension above 42 mm in 58% (7/12) and ejection fraction below 50% in 58% (7/12). We found that IgG1 and IgG2 anti-T. cruzi antibodies showed higher titer than IgG3 antibodies, with consistently low titer of IgG4 antibodies. Expression of the four IgG subclasses of anti-T. cruzi antibodies suggest a mixed Th1/Th2-like immune response under a probably continuous chronic antigenic stimulation. On the other hand, high levels of IgG2 anti-T. cruzi antibodies showed a tendency to be associated with severe cardiomegaly. Our results suggest that a mixed Th1/Th2-like immune response may take place in chronic chagasic patients under a chronic antigenic stimulation.

Estudio de inmunogenicidad de la vacuna antitifoídica cubana de polisacárido Vi vax-TyVi® en ratones

Directory of Open Access Journals (Sweden)

Juan Carlos Ramírez

2006-08-01

Full Text Available Salmonella enterica serovar Typhi es un microorganismo que provoca más de 16 millones de casos de fiebre tifoidea con aproximadamente 600 000 muertes al año en todo el mundo. Dentro de las vacunas antitifoídicas la de polisacárido capsular Vi ha encontrado, gracias a sus incuestionables ventajas, una gran aceptación entre productores y consumidores. El presente trabajo aborda el estudio de inmunogenicidad de la vacuna antitifoídica cubana de polisacárido Vi vax-TyViâ en ratones. El estudio estuvo conformado por un grupo control no inoculado y un segundo grupo que recibió 0,05 mL de la vacuna por vía intramuscular. Se tomaron muestras de sangre a los -3, 7, 14, 21, 28, 42, 56 y 84 días. La actividad de anticuerpos IgG antipolisacárido Vi de los sueros individuales fue determinada por ELISA. Los datos fueron analizados por grupo y por sexo y se calculó el porcentaje de seroconversión, considerándose respondedor aquel animal que al menos aumentara en cuatro veces su título inicial. La respuesta de anticuerpos inducida por la vacuna mostró un aumento notable de los títulos de IgG antipolisacárido Vi en el grupo vacunado (100% de seroconversión, mientras que el grupo control no incrementó sus niveles mínimos iniciales (0% de respondedores. Aunque más dispersa, la respuesta de anticuerpos antiVi fue significativamente mayor en las hembras que en los machos.

Presencia del virus del oeste del Nilo en el noreste de México Presence of west Nile virus in northeast Mexico

Directory of Open Access Journals (Sweden)

Ildefonso Fernández-Salas

2007-06-01

Full Text Available OBJETIVO: Detectar la presencia del virus del oeste del Nilo (VON en aves, equinos y seres humanos en el noreste de México. MATERIAL Y MÉTODOS: Se buscó en diferentes localidades del noreste de México la presencia de anticuerpos antivirus del oeste del Nilo (anti-VON en suero de 33 aves, 24 caballos y 237 personas mediante pruebas de ELISA durante el periodo de julio de 2003 a julio de 2006. En los sueros humanos se buscó también el RNA-VON mediante RT-PCR. RESULTADOS: Se encontraron tres aves seropositivas y 15 equinos. En el hombre, 40% de los sueros fue positivo para anticuerpos IgG y ninguno para anticuerpos IgM. CONCLUSIONES: El VON se encuentra activo en México y se suma a otras enfermedades emergentes transmitidas por vectores que representan un reto a la investigación y a los programas de prevención.OBJECTIVE: To investigate the presence of WNV in birds, horses and humans in northeast Mexico. MATERIAL AND METHODS: Serum samples from 33 birds, 24 horses and 237 humans were screened by ELISA for Anti-WNV antibodies. Human serum samples were also screened for WNV RNA using an RT-PCR assay. RESULTS: Positive sera were found in three birds and 15 horses. Forty percent of the human serum samples were positive for IgG antibodies and 0% for IgM antibodies and viral RNA. CONCLUSIONS: The results of this study show that WNV is present in northeast Mexico and it is a new emergent infectious agent that represents a challenge for research and prevention programs in Mexico.

The apparent monovalency of human IgG4 is due to bispecificity

NARCIS (Netherlands)

Aalberse, R. C.; Schuurman, J.; van Ree, R.

1999-01-01

A hypothesis is put forward to explain the apparent monovalency of human IgG4. It is based upon the known instability of the IgG4 hinge. IgG4 is secreted as a regular bivalent antibody, but after secretion interacts with another IgG4 molecule. This interaction results in the exchange of half

Salivary Gland Pathology in IgG4-Related Disease: A Comprehensive Review

Directory of Open Access Journals (Sweden)

Ilaria Puxeddu

2018-01-01

Full Text Available IgG4-related disease (IgG4-RD is a rare fibroinflammatory condition that can affect almost any organ, characterized by swollen lesions and often by eosinophilia and elevated serum IgG4 concentrations. The diagnosis of IgG4-RD is a challenging task: in fact, single or multiple organs can be affected and clinical, serological, and histological findings can be heterogeneous. In IgG4-RD, the involvement of salivary glands is observed in 27% to 53% of patients. Several organ-specific conditions, now recognized as different manifestations of IgG4-related sialadenitis (IgG4-RS, were viewed in the past as individual disease entities. The study of salivary glands may sometimes be complex, because of the number of pathological conditions that may affect them, often with overlapping clinical pictures. Integration of different imaging techniques is often required in the case of swelling of salivary glands, even though biopsy remains the gold standard for a definite diagnosis of IgG4-RS. Thus, in this review, we discuss new insights in the pathogenesis of IgG4-RD, focusing on its clinical aspects and the tools that are currently available for a correct differential diagnosis when the salivary glands are involved.

IgG4-related disease-experience of 100 consecutive cases from a specialist centre.

Science.gov (United States)

Bateman, Adrian C; Culver, Emma L

2017-04-01

To describe the features of 100 consecutive cases referred to a single UK institution in which a diagnosis of IgG4-related disease (IgG4-RD) was under consideration. The histological features were reviewed by a single histopathologist, and cases were categorized according to the 2012 Boston criteria: Category 1-histologically highly suggestive of IgG4-RD; Category 2-probable histopathological features of IgG4-RD; and Category 3-insufficient histopathological evidence of IgG4-RD. A 'global assessment' was performed with the available clinical information: Assessment group 1-'definite/very likely IgG4-RD'; Assessment group 2-'possible IgG4-RD'; Assessment group 3-'not IgG4-RD'; and Assessment group 4-insufficient information. The mean IgG4+ plasma cell count and IgG4+/IgG+ ratio were highest in Category 1 [134/high-power field (HPF); 57%] and Assessment group 1 (113/HPF; 52%), and lowest in Category 3 (11/HPF; 18%) and Assessment group 3 (43/HPF; 31%) (Category comparison of IgG4+ count and ratio, both P IgG4+ count, P IgG4-RD diagnosis was rare in Category 1 (7%) but common in Category 2 (60%) and Category 3 (47%). Stromal reactions to neoplasia and chronic oral ulceration were simulants of IgG4-RD. The Boston criteria are linked to the likelihood of IgG4-RD. Other conditions may show some histological features of IgG4-RD. The likelihood of IgG4-RD is much greater when the histological features reach the threshold for Category 1 than when they reach the thresholds for Categories 2 and 3. Despite the utility of the Boston criteria, this study highlights the crucial importance of careful clinicopathological correlation when a diagnosis of IgG4-RD is under consideration. © 2016 John Wiley & Sons Ltd.

Flexibility and conformational change of IgG molecule

International Nuclear Information System (INIS)

Alpert, Y.; Ostanevich, Yu.M.

1982-12-01

The dynamic behaviour of pig anti-Dnp-immunoglobulin (IgG) investigated by the neutron spin echo technique gave evidence of internal motion of a biological macromolecule. It is suggested that this motion belongs to the wobbling of the Fab parts of the investigated IgG molecule around its so called hinge region. (author)

Seropositivity and determinants of immunoglobulin-G (IgG ...

African Journals Online (AJOL)

Background: This study is the first documented prevalence of IgG antibody against HSV-1&-2 in Port Harcourt, Nigeria and thus provides baseline data for future in-depth studies on HSV infection in South-South, Nigeria. Objective: This study determined the seropositivity and determinants of serum IgG antibody against ...

Abnormal serum IgG subclass pattern in children with Down's syndrome.

Science.gov (United States)

Annerén, G; Magnusson, C G; Lilja, G; Nordvall, S L

1992-05-01

Susceptibility to infections is a well known feature of Down's syndrome. The possible relation between this predisposition and the serum concentrations of the IgG subclasses was studied in 38 children with Down's syndrome aged 1-12 years. An age matched group of 50 healthy children served as controls. The serum concentrations of IgG1 and IgG3 were significantly raised among children with Down's syndrome in all three age groups studied (that is 1-2.5, 4-8, and 9-12 years). The serum concentrations of IgG2 were normal in the first two groups but significantly reduced in the third age group. In contrast, the concentrations of IgG4 among children with Down's syndrome were significantly reduced in all three age groups. Moreover, among the children with Down's syndrome aged 4-12 years 68% (15/22) had IgG4 concentrations below 2 SDs of the geometrical mean of the controls. The results may partially explain the proneness of children with Down's syndrome to infections with encapsulated bacteria. Although the underlying cause of these abnormalities is unknown, IgG subclass determination seems relevant in the clinical evaluation of children with Down's syndrome.

The Relationship of Gamma Immunoglobin (IgG) Density and Apgar ...

African Journals Online (AJOL)

The transfer of maternal IgG provides the neonate with humoral immunity during early life. The population of transferred IgG or IgG density (IgGρ) was estimated to find out if it has any relevance to the condition of an infant 1-5 minutes after birth or APGAR score which gives an insight into the state of health of the infant and ...

Factores asociados a una respuesta inadecuada a la vacunación contra la hepatitis B en personal sanitario

Directory of Open Access Journals (Sweden)

Tolosa Martínez Natividad

1998-01-01

Full Text Available FUNDAMENTO: La vacuna recombinante contra la hepatitis B confiere inmunidad aproximadamente en el 95 % de los casos, pero existe un porcentaje que responde insuficientemente. El objetivo de este trabajo es evaluar los factores que se asocian con una inadecuada respuesta inmunitaria. MÉTODOS: Se trata de un estudio observacional y analítico en el que se sigue retrospectivamente una cohorte de sujetos vacunados frente al virus de la hepatitis B (VHB. Se recogieron las variables de interés del personal sanitario que cumplía los criterios de inclusión, del Área de Salud 9 de la Comunidad Valenciana (n=827. Tras la vacunación se determinó la titulación de anticuerpos de superficie (antiHBs para comprobar la respuesta, considerándose niveles protectores los superiores a 10 mUI/ml. RESULTADOS: Se produjo una adecuada seroconversión en el 94,4% de los vacunados. La baja o nula respuesta a la vacuna se asoció significativamente y de forma independiente con variables como el sexo masculino, la edad, el índice de masa corporal (IMC y el tabaquismo. El consumo de alcohol y los niveles de GPT, aunque no se relacionaron de forma significativa con la respuesta a la vacuna, actuaron como posibles factores de confusión. CONCLUSIONES: La inmunogenicidad de la vacuna es satisfactoria. Es importante cuantificar los niveles de antiHBs, sobretodo cuando hay factores predictivos de mala respuesta. De esta manera, es posible identificar a aquellos que precisan dosis de recuerdo y a los no respondedores, evitándose así situaciones de falsa sensación de protección frente al VHB.

Characteristic tubulointerstitial nephritis in IgG4-related disease.

Science.gov (United States)

Yamaguchi, Yutaka; Kanetsuna, Yukiko; Honda, Kazuho; Yamanaka, Nobuaki; Kawano, Mitsuhiro; Nagata, Michio

2012-04-01

Nephropathy associated with IgG4-related disease is characterized by tubulointerstitial nephritis. To better identify its pathology, the present study analyzed clinicopathologic features of IgG4-related tubulointerstitial nephritis cases from across Japan. Sixteen cases were identified as IgG4-related nephropathy using the criterion of high serum IgG4 levels (>135 mg/dL) with abnormal kidney computed tomography or elevated serum creatinine levels. Male predominance (75%) and advanced age (average, 62.0 years) were noted. Eight cases displayed no autoimmune pancreatitis. Renal computed tomography abnormalities were found in 12 of 13 cases examined. Renal dysfunction was found in 15 of 16 cases at biopsy. Distinctive features of tubulointerstitial lesions included (1) well-demarcated borders between involved and uninvolved areas; (2) involvement of the cortex and medulla, often extending beyond the renal capsule and with occasional extension to retroperitoneal fibrosis; (3) interstitial inflammatory cells comprising predominantly plasma cells and lymphocytes, with a high prevalence of IgG4-positive cells often admixed with fibrosis; (4) peculiar features of interstitial fibrosis resembling a "bird's-eye" pattern comprising fibrosis among inter-plasma cell spaces; and (5) deposits visible by light and immunofluorescent microscopy in the tubular basement membrane, Bowman capsule, and interstitium that are restricted to the involved portion, sparing normal parts. Ultrastructural analysis revealed the presence of myofibroblasts with intracellular/pericellular collagen accompanied by plasma cell accumulation from an early stage. Histology could not discriminate between IgG4-related tubulointerstitial nephritis with and without autoimmune pancreatitis. In conclusion, the distinctive histologic features of IgG4-related tubulointerstitial nephritis can facilitate the differential diagnosis of tubulointerstitial nephritis, even without autoimmune pancreatitis or an abnormal

Atypical IgG4+ Plasmacytic Proliferations and Lymphomas: Characterization of 11 Cases.

Science.gov (United States)

Bledsoe, Jacob R; Wallace, Zachary S; Deshpande, Vikram; Richter, Joshua R; Klapman, Jason; Cowan, Andrew; Stone, John H; Ferry, Judith A

2017-09-01

To report the clinicopathologic features of monotypic immunoglobulin G4+ (IgG4+) lymphoid and plasmacytic proliferations. Cases were identified from the pathology files. Pathology and clinical materials were reviewed. Eleven cases of monotypic IgG4+ proliferations were identified at nodal, orbital, or salivary sites. Six cases (three men, three women; age, 57-94 years) met criteria for lymphoma or plasma cell neoplasia. Most contained frequent Mott cells. Five cases (three men, two women; age, 40-80 years) had restricted proliferations of atypical/monotypic IgG4+ plasma cells in a background of reactive lymphoid hyperplasia or inflammation. Monotypic IgG4+ proliferations include lymphomas, plasmacytic neoplasms, and a previously uncharacterized group of proliferations not meeting criteria for conventional hematolymphoid neoplasia. Distinct features included prominent Mott cells and/or monotypic plasma cells within follicles. The proliferations were infrequently associated with IgG4-related disease (IgG4-RD). Our findings raise questions regarding the relationship between clonal IgG4+ proliferations, reactive/inflammatory processes, and IgG4-RD. © American Society for Clinical Pathology, 2017. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com

Enfermedad injerto contra huesped: sus manifestaciones bucales

Directory of Open Access Journals (Sweden)

Claudia Marcela Hernández Cancino

Full Text Available La enfermedad injerto contra huésped es la principal complicación que sufren los pacientes que han recibido trasplante alogénico. Se produce como consecuencia de una reacción inflamatoria exagerada mediada por los linfocitos del donante y estimulada por aquellos tejidos que han sido lesionados por la enfermedad de base, por las infecciones previas o por el tratamiento de acondicionamiento. El diagnóstico es clínico e histopatológico. Los pacientes presentan rash maculopapular pruriginoso y doloroso que puede extenderse por toda la superficie corporal, fiebre, vómito, náuseas, diarrea y anorexia. En la mucosa bucal se observan erosiones ulceradas, extremamente dolorosas y pueden ser la primera o la única manifestación detectable clínicamente de esta enfermedad. El objetivo es presentar un caso de enfermedad de injerto contra huésped. Se trata de una mujer de 54 años de edad con linfoma no-Hodgking, que recibió tratamiento con quimioterapia, radioterapia y trasplante de células madre hematopoyéticas en el 2009. Tres meses después, presentó lesiones en la piel diagnosticadas como enfermedad injerto contra huésped y tratadas con corticoesteroides, a los seis meses fue remitida al odontólogo porque se quejaba de ardor en la boca, xerostomía y dificultad para masticar, tenía úlceras en la mucosa bucal y en la lengua. En la ocasión recibió tratamiento con corticoesteroides, clorhexidina, orientaciones de higiene bucal y controles clínicos permanentes. Aunque existen protocolos para la prevención y el tratamiento de la enfermedad injerto contra el huésped, su frecuencia ha aumentado en los últimos años debido al incremento en el número de trasplantes. Por esta razón, es fundamental que el odontólogo forme parte del grupo multidisciplinario que asiste al paciente y que esté familiarizado con los signos y síntomas de esta enfermedad en la mucosa bucal, pues las manifestaciones clínicas pueden ser las únicas para

Bilateral IgG4-related ophthalmic disease: a strong indication for systemic imaging.

Science.gov (United States)

Wu, Albert; Andrew, Nicholas H; McNab, Alan A; Selva, Dinesh

2016-10-01

To investigate whether bilateral or unilateral IgG4-related ophthalmic disease (IgG4-ROD) is associated with extra-ophthalmic IgG4-related disease (IgG4-RD). Twin-centre retrospective observational case series of biopsy-confirmed IgG4-ROD. Clinical and radiology data were reviewed for laterality of IgG4-ROD and presence of extra-ophthalmic disease. The literature was reviewed for case series of IgG4-ROD. 40 IgG4-ROD cases were identified, with median follow-up of 36 months. At diagnosis of IgG4-ROD, all cases were screened for extra-ophthalmic disease with physical examination and blood testing. Systemic imaging was performed in 20 (50%) cases due to clinical suspicion of extra-ophthalmic disease. Of the 21 unilateral IgG4-ROD cases, 3 (14%) had extra-ophthalmic involvement. Of the 19 bilateral cases, 15 (79%) had extra-ophthalmic involvement. Extra-ophthalmic involvement was strongly associated with bilateral IgG4-ROD (pIgG4-ROD is strongly associated with extra-ophthalmic IgG4-RD. We recommend that imaging of the neck, chest, abdomen and pelvis be performed for all bilateral cases. Systemic imaging should also be considered in unilateral cases as a significant proportion of these patients will also have extra-ophthalmic disease. Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

Induced transdifferentiation of human B-leukemia/lymphoma cell lines and inhibition of leukemogenicity

OpenAIRE

Rapino, Francesca, 1982-

2013-01-01

Las neoplasias malignas de células B abarcan una amplia variedad de enfermedades diferentes, incluyendo el linfoma no Hodgkin (LNH) y leucemia. Actualmente, la quimioterapia, la radiación y el tratamiento con anticuerpos anti-CD20 son los pilares de la terapia contra el linfoma y la leucemia de células B. Sin embargo, el hecho de que un gran porcentaje de pacientes no se cura con estos tratamientos, justifica la búsqueda de nuevas terapias más eficaces. Aunque la inducció...

Evaluation of the immune response after vaccination against distemper at a mink (Mustela vison) farm in Argentina

OpenAIRE

Jar, A. M.; Ramayo, L. G.; Stempler, A.; Goldman, L. H.; Mundo, S. L.

2010-01-01

El virus del distemper produce una enfermedad en los visones que cursa con síntomas respiratorios, gastrointestinales, neurológicos y cutáneos y presenta alta morbilidad y mortalidad, principalmente en los cachorros. La enfermedad se controla mediante la aplicación de vacunas destinadas a esta especie. El objetivo del trabajo fue determinar el título de anticuerpos neutralizantes contra el virus del distemper en visones vacunados y no vacunados de un criadero de Argentina. Se analizó la cinét...

Detection of FMD virus type specific IgG1, IgG2 and IgA antibodies in milk and serum of buffaloes vaccinated with oil adjuvanted polyvalent FMD vaccine

Directory of Open Access Journals (Sweden)

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.

Plan de defensa contra incendios en la comarca Boedo - Ojeda.

OpenAIRE

Blanco Esteban, Beatriz del

2014-01-01

El proyecto de defensa contra incendios de la comarca Boedo - Ojeda pretende realizar una planificación de la prevención y la defensa contra incendios en la comarca. La comarca es de especial interés debido a su situación de transición entre los campos y las montañas, lo que la hace especialmente variable en ecosistemas y con una gran diversidad de flora y fauna. Se trata además de una zona con campos de cultivo adyacentes a los montes, lo que configura una alta probabilidad...

IgG4-related retroperitoneal fibrosis: a newly characterized disease.

Science.gov (United States)

Lian, Linjuan; Wang, Cong; Tian, Jian-Li

2016-11-01

Retroperitoneal fibrosis (RPF) is a rare disease characterized by chronic, nonspecific inflammatory and sclerotic or fibrotic tissue in the periaortic or periiliac retroperitoneum that encases adjacent structures. There will be a series of clinical manifestations once the proliferated fibrous tissues encase the abdominal aorta, iliac arteries and urinary duct. RPF is generally divided into two types: idiopathic retroperitoneal fibrosis (IRPF) without identified pathogenesis, making up about two-thirds of cases, and secondary retroperitoneal fibrosis. Recent studies on Immunoglobulin G4-related disease (IgG4-RD) reveal that abundant infiltration of IgG4 positive plasma cells is found in biopsies on the mass of RPF of some IRPF patients, which is identified as one spectrum of IgG4-RD and is named IgG4-related RPF. IgG4-related RPF is often misdiagnosed as retroperitoneal visceral malignancy and is treated with surgery. In addition, because of its good response to glucocorticoid, early detection and treatment is important. We review the definition, epidemiology, clinical features, diagnostic criteria, treatment and prognosis of IgG4-related RPF in this article to raise awareness of this newly characterized disease. © 2016 Asia Pacific League of Associations for Rheumatology and John Wiley & Sons Australia, Ltd.

IgG4-related sclerosing cholangitis overlapping with autoimmune hepatitis: Report of a case.

Science.gov (United States)

Li, Hongyan; Sun, Li; Brigstock, David R; Qi, Lina; Gao, Runping

2017-05-01

IgG4-related sclerosing cholangitis (IgG4-SC) is the biliary manifestation of IgG4-related disease (IgG4-RD) but the presence of IgG4-SC in the porta hepatis is difficult to differentiate from hilar cholangiocarcinoma (HCCA). IgG4-related autoimmune hepatitis (IgG4-related AIH) is extremely rare and it is not fully clear whether IgG4-related AIH is a hepatic manifestation of IgG4-RD or a subtype of AIH. We present a rare case of a 52-year-old male who was admitted with obstructive jaundice and itchy skin. He primarily presented a severe bile duct stricture in the porta hepatis and an elevated serum level of carbohydrate antigen 19-9 (CA19-9) mimicking HCCA. The patient underwent a surgical resection of the left hepatic lobular and cholecyst as well as common bile duct with a right hepatico-jejunostomy. He was finally diagnosed as IgG4-SC accompanied with IgG4-related AIH by immunohistochemistry, but he lacked conventional autoantibodies. The patient responded well to steroid therapy and remains healthy with no signs of recurrence at six-month follow-up. This is the first case report that hepatic portal IgG4-SC overlapping with IgG4-related AIH without the presence of conventional autoantibodies. Additionally, we suggest that IgG4-RD should be always considered in case of a bile duct stricture in the porta hepatis to avoid unnecessary surgical operation. Copyright © 2017 Elsevier GmbH. All rights reserved.

Molecular cloning and differential IgG responses to a histidine-rich ...

African Journals Online (AJOL)

C1 immunoglobulin G (IgG) subclass levels were assessed by ELISA in 15 pairs and 18 pairs of selected and cross-matched infected and putatively immune subjects from Cameroon and Ecuador, respectively. IgG3 and IgG4 levels were shown to be significantly higher in putatively immune (immune protected) subjects.

IgG4-related disease of the biliary tract and pancreas: clinical and experimental advances.

Science.gov (United States)

Hubers, Lowiek M; Beuers, Ulrich

2017-07-01

IgG4-related disease (IgG4-RD) is an immune-mediated disease of unknown cause. It predominantly affects the biliary tract [IgG4-associated cholangitis (IAC)] and pancreas [autoimmune pancreatitis (AIP)] of mostly elderly men. Accurate diagnostic tests are lacking. Patients benefit from predniso(lo)ne treatment. However, disease relapse is often seen. This review will address pathophysiological aspects and advances in diagnostic and therapeutic strategies. The role of IgG1 and IgG4 in the pathophysiology of IgG4-RD was studied in mice which showed more intense organ damage of pancreas and salivary glands when IgG1 rather than IgG4 of patients with IgG4-RD was injected. Coadministration of IgG1+IgG4 led to dampening of IgG1-mediated injury supporting the view that IgG4 exerts immune-dampening effects. IgG4+ B-cell receptor clones identified by next-generation sequencing and the IgG4/IgG RNA ratio in human blood assessed by quantitative PCR were able to accurately distinguish IAC/AIP from primary sclerosing cholangitis or pancreatobiliary malignancies. Long-term treatment with low-dose prednisolone was safe and reduced the number of flare-ups in patients with AIP. Early diagnosis by a novel accurate and easy-to-use qPCR test may prevent life-threatening complications, unnecessary interventions and fatal course because of misdiagnosis. Prednisolone treatment remains the standard of care in patients with IgG4-RD.

Some histopathological aspects of the disease related to IgG-4

Directory of Open Access Journals (Sweden)

Minerva Lazos-Ochoa

2015-04-01

Full Text Available The IgG4-related disease (IgG4-RD is a recurrent chronic fibroinflammatory disease, probably of autoimmune origin, recently recognised. Its diagnosis is based on a combination of clinical, radiological, serological, histopathological and immunohistochemical data. However, the histopathology is considered as the golden “standard” for diagnosis. In most of the cases, the sum of lymphoplasmacytic inflammatory infiltrate with abundant IgG4+ plasma cells, storiform fibrosis and obliterative phlebitis makes a reliable diagnosis. Patients usually show elevated serum IgG4 concentrations and respond well to steroid therapy. Nowadays, IgG4-RD has been described in almost every organ: pancreatobiliary tract, liver, salivary glands, nasopharynx, bone marrow, lacrimal gland, extra-ocular muscles and retrobulbar space, kidney, lung, lymph nodes, meninges, aorta, skin, breast, prostate, thyroid gland and pericardium.

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

Directory of Open Access Journals (Sweden)

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.

Clinical Features of Patients with Basedow's Disease and High Serum IgG4 Levels.

Science.gov (United States)

Torimoto, Keiichi; Okada, Yosuke; Kurozumi, Akira; Narisawa, Manabu; Arao, Tadashi; Tanaka, Yoshiya

2017-01-01

Objective IgG4-related disease is a recently characterized condition presenting with high blood IgG4 levels, swelling of organs, and hypertrophic lesions. This disease is associated with thyroid disease, Hashimoto's disease, and Riedel's thyroiditis. However, there is little information on the association between IgG4-related disease and Basedow's disease. We herein defined the clinical features of patients with Basedow's disease and high IgG4 levels. Methods We compared two groups of patients with Basedow's disease (n=72) who had either normal IgG4 levels (IgG4 levels (≥135 mg/dL; n=5 [6.9%], mean IgG4: 206±116 mg/dL, IgG4/IgG ratio: 10.6%±3.3%). Patients Seventy-two newly diagnosed, untreated patients with Basedow's disease. Results Compared to the normal IgG4 group, patients in the high IgG4 group were predominantly male and showed a significantly higher thyroid low-echo score (1.8±0.4 vs. 1.2±0.5) and eosinophil count (363±354/mm 2 vs. 136±122/mm 2 ). Five patients had high IgG4 levels: one had a pancreatic lesion, and four had thyroid lesions. Conclusion Patients with Basedow's disease and high IgG4 levels may represent a new subtype of Basedow's disease. Further studies with larger sample sizes are needed.

Development of a polyclonal anti-dugong immunoglobulin G (IgG) antibody with evaluation of total plasma IgG in a living dugong (Dugong dugon) population.

Science.gov (United States)

Wong, Arthur; Lanyon, Janet M; McKee, Sara J; Linedale, Richard; Woolford, Lucy; Long, Trevor; Leggatt, Graham R

2018-06-01

Species-specific antibodies (Ab) for the measurement of immunoglobulins (Ig) are valuable tools for determining the humoral immune status of threatened and endangered wildlife species such as dugongs. However, no studies have reported antibody reagents against dugong immunoglobulin. The object of this study was to develop an Ab with specificity for dugong IgG and apply this tool to survey total IgG levels in plasma samples from a live wild population of dugongs in southern Queensland, Australia. Dugong IgG was isolated from plasma by protein A/G column chromatography and a polyclonal antiserum was successfully raised against the dugong IgG through immunization of mice. The anti-dugong antiserum was reactive with dugong serum but not immunoglobulin from other species such as rats and humans. When tested against a panel of dugong plasma samples, relative IgG levels from dugongs (n = 116) showed biologically relevant relationships with pregnancy status and a principal component of Body Mass Index (BMI)/globulin/fecal glucocorticosteroid (chronic stress) levels combined, which together accounted for 9.2% of the variation in total Ig levels. Together these data suggest that dugongs show variation in total IgG and that this correlates with some physiological parameters of dugong health. Copyright © 2018 Elsevier B.V. All rights reserved.

A new support material for IgG adsorption: Syntrichia papillosissima (Copp.) Loeske.

Science.gov (United States)

Demir, Mithat Evrim; Aktaş Uygun, Deniz; Erdağ, Adnan; Akgöl, Sinan

2017-11-01

In this presented work, Syntrichia papillosissima (Copp.) Loeske (S. papillosissima) was used as a natural phytosorbent for IgG purification. These moss species were collected for the natural habitat and prepared for IgG adsorption studies by cleaning, drying, and grinding to uniform size. Syntrichia papillosissima samples were characterized by using FTIR and SEM studies. Functional groups of S. papillosissima were identified by FTIR analysis, while surface characteristics were determined by SEM studies. A batch system was used for the adsorption of IgG onto S. papillosissima surface and physical conditions of the IgG adsorption medium were investigated by modifying the pH, IgG concentration and temperature. Maximum IgG adsorption onto S. papillosissima was found to be 68.01 mg/g moss by using pH 5.0 buffer system. Adsorption kinetic isotherms were also studied and it was found that, Langmuir adsorption model was appropriate for this adsorption study. Reusability profile of S. papillosissima was also investigated and IgG adsorption capacity did not decrease significantly after 5 reuse studies. Results indicated that S. papillosissima species have the capacity to be used as biosorbent for IgG purification, with its low cost, natural and biodegradable structure.

Desarrollo de improntas para el diagnóstico del virus Epstein-Barr por inmunofluorescencia indirecta Development of slides for Epstein-Barr virus diagnosis by indirect immunofluorescence

Directory of Open Access Journals (Sweden)

Germán R. Pérez

2005-08-01

Full Text Available El virus de Epstein-Barr (VEB es el principal agente oncogénico linfotrópico dentro de la familia Herpesviridae y se encuentra mundialmente distribuido. La primoinfección se produce en adultos jóvenes y se manifiesta como mononucleosis infecciosa. La detección de anticuerpos anti-viral capside antigen (VCA indica infección previa o presente con VEB. Además, se observan títulos elevados de anticuerpos anti-VCA en las enfermedades neoplásicas asociadas al VEB como los linfomas, en individuos HIV-positivos. El objetivo de este estudio fue el desarrollo y puesta a punto de improntas de células P3HR1 para la detección serológica del VEB por técnicas de inmunofluorescencia indirecta (IFI. Se estimularon cultivos de células P3HR1 en crecimiento exponencial con phorbol-12-mirystoil-13-acetato, y se recolectaron alícuotas a distintos tiempos para realizar improntas. Se realizó una IFI con cada impronta usando como anticuerpo primario un suero VEB-positivo. Se observó un aumento del 11% en la expresión del VCA a las 40 horas post-estimulación, decayendo al 3.5% a las 48 horas. Estos datos fueron corroborados por ensayo de western blot con inmunodetección. La precisión intra- e inter-lote de las improntas fue evaluada para anticuerpos IgM e IgG, con sueros probados previamente por equipos para esta determinación disponibles en el mercado para el VEB y con sueros reactivos para otros miembros de la familia Herpesviridae. No se obtuvieron resultados falsos-negativos ni falsos-positivos para el VEB ni se observó reactividad cruzada con otros herpesvirus. Las improntas desarrolladas constituyen un instrumento para el diagnóstico de la primoinfección del VEB y la detección serológica de anticuerpos IgG anti-VCA de neoplasias asociadas al VEB.Epstein-Barr virus (EBV is the main oncogenic lymphotropic agent of the Herpesviridae family and is globally distributed. EBV acute infection occurs in young adults producing infectious

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.

Deconstructing IgG4-related disease involvement of midline structures: Comparison to common mimickers.

Science.gov (United States)

Lanzillotta, Marco; Campochiaro, Corrado; Trimarchi, Matteo; Arrigoni, Gianluigi; Gerevini, Simonetta; Milani, Raffaella; Bozzolo, Enrica; Biafora, Matteo; Venturini, Elena; Cicalese, Maria Pia; Stone, John H; Sabbadini, Maria Grazia; Della-Torre, Emanuel

2017-07-01

A series of destructive and tumefactive lesions of the midline structures have been recently added to the spectrum of IgG4-related disease (IgG4-RD). We examined the clinical, serological, endoscopic, radiological, and histological features that might be of utility in distinguishing IgG4-RD from other forms of inflammatory conditions with the potential to involve the sinonasal area and the oral cavity. We studied 11 consecutive patients with erosive and/or tumefactive lesions of the midline structures referred to our tertiary care center. All patients underwent serum IgG4 measurement, flow cytometry for circulating plasmablast counts, nasal endoscopy, radiological studies, and histological evaluation of tissue specimens. The histological studies included immunostaining studies to assess the number of IgG4 + plasma cells/HPF for calculation of the IgG4+/IgG + plasma cell ratio. Five patients with granulomatosis with polyangiitis (GPA), three with cocaine-induced midline destructive lesions (CIMDL), and three with IgG4-RD were studied. We found no clinical, endoscopic, or radiological findings specific for IgG4-RD. Increased serum IgG4 and plasmablasts levels were not specific for IgG4-RD. Rather, all 11 patients had elevated blood plasmablast concentrations, and several patients with GPA and CIMDL had elevated serum IgG4 levels. Storiform fibrosis and an IgG4+/IgG + plasma cell ratio >20% on histological examination, however, were observed only in patients with IgG4-RD. Histological examination of bioptic samples from the sinonasal area and oral cavity represents the mainstay for the diagnosis of IgG4-RD involvement of the midline structures.

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

alloimmunity, which may be lethal. A novel strategy to control pathogenic antibodies would be administration of a non-destructive IgG antibody blocking antigen binding while retaining binding to FcRn. We report on two human IgG3 antibodies with a hinge deletion and a C131S point mutation (IgG3ΔHinge...

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

Directory of Open Access Journals (Sweden)

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

Timothy-specific IgG antibody levels vary with the pollen seasons.

Science.gov (United States)

Nordvall, S L; Larsson, P H; Johansson, S G

1986-11-01

Serum samples were collected from eight grass pollen hypersensitive children during a 4-year period. The sera were assayed for contents of timothy-specific IgE antibodies by RAST. Timothy-specific IgG and IgA antibodies were quantified by a refined ELISA in which covalent binding of the antigen to the polystyrene solid phase had been performed. IgG antibodies were also assayed by a Sepharose-protein-A technique with radiolabelled timothy allergens as the antigen. It was possible to register clearcut seasonal variations with postseasonally boosted antibody levels not only of timothy-specific IgE but also of IgG antibody. Both IgG1 and IgG4 antibodies specific for timothy showed seasonal variations of a similar degree. It was not possible to register seasonal variations of the same magnitude of timothy-specific IgA antibodies.

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

Directory of Open Access Journals (Sweden)

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

The emerging mysteries of IgG4-related disease

NARCIS (Netherlands)

Smit, Wouter; Barnes, Eleanor

2014-01-01

IgG4-related disease (IgG4-RD) is increasingly recognised in Western societies as a multi-system, inflammatory, fibrosing disease of unknown aetiology that typically, though not exclusively, presents in older men. The clinical manifestations are diverse and almost any organ may be affected. The

What is IgG4? A review of the biology of a unique immunoglobulin subtype.

Science.gov (United States)

Nirula, Ajay; Glaser, Scott M; Kalled, Susan L; Taylor, Frederick R; Taylora, Frederick R

2011-01-01

Recent descriptions of the group of clinical disorders collectively defined as IgG4-related systemic disease (IgG4-RSD) have prompted this review of the unique biology of the IgG4 antibody. This article will discuss IgG4 structure and function, the unique phenomenon of half-antibody exchange, and the implications of IgG4 biology for its proposed role in immunologic diseases. IgG4 antibodies have unique structural and functional properties and undergo 'half-antibody exchange' in vivo, resulting in recombined antibodies composed of two different binding specificities. The production of IgG4 antibodies appears to be driven in part by T helper 2 (Th2) cytokines that mediate allergic responses and IgE production. Although serum IgG4 levels in healthy individuals vary significantly, data from multiple sclerosis (MS) patients suggest tight regulation of individual IgG4 levels over time. IgG4-RSD represents a diverse group of clinical disorders unified by elevated IgG4 levels and specific histopathologic findings. A key unanswered question is whether IgG4, a relatively weak activator of effector cells, is pathogenic in these disorders. IgG4 is a unique antibody biologically and structurally. Increased understanding of its precise role in the clinical syndromes that comprise IgG4-RSD may ultimately elucidate the underlying pathogenesis.

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

Directory of Open Access Journals (Sweden)

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.

Multiple nuclear dots and rim-like/membranous IgG isotypes in primary biliary cirrhosis.

Science.gov (United States)

Muratori, Paolo; Granito, Alessandro; Ferri, Silvia; Pappas, Georgios; Volta, Umberto; Menichella, Rita; Bianchi, Francesco B; Lenzi, Marco; Muratori, Luigi

2009-03-01

Anti nuclear (ANA) immunomorphological patterns such as multiple nuclear dots (MND) and rim-like/membranous (RL/M) are considered highly specific but little sensitive for primary biliary cirrhosis (PBC) diagnosis. To evaluate frequency and clinical significance of MND and RL/M in PBC patients when investigated at the level of immunoglobulin G isotypes. MND and RL/M pattern have been tested in 141 PBC sera and 230 pathological controls using HEp-2 cells as substrate and anti- total IgG and individual IgG subclasses (IgG1, IgG2, IgG3, IgG4) as specific antisera. One hundred and fourteen of 141 (80%) PBC patients had RL/M or MND pattern when IgG subclasses were used as revealing reagents (vs. 34% when anti total IgG were used, p < 0.0001). The prevalent isotype was IgG1 for RL/M, and IgG2 for MND pattern. None of controls was positive. No clinical differences in terms of severity and outcome of disease have been observed in PBC patients positive for MND and RL/M when investigated with IgG isotypes. The research for RL/M and MND pattern at level of IgG isotype determines a wide gain in terms of sensitivity without a loss of specificity. In Italian PBC patients MND and RL/M pattern did not seem to characterize any subgroup of patients with a poorer prognosis.

Persistent Lymphadenopathy due to IgG4-Related Disease

Science.gov (United States)

2012-10-01

capsid IgM negative), CMV (IgM negative, IgG negative), parvovirus B19 (IgM negative, IgG negative), Hepatitis (HBs Ag negative, HBc Ab negative, HBs...lymphadenopathy). Figure 2: Hematoxylin and eosin stain of a resected lymph node, 2x magnification. This preparation shows nonspecific reactive follicular

Application of Food-specific IgG Antibody Detection in Allergy Dermatosis

Directory of Open Access Journals (Sweden)

Yine Hu

2015-01-01

Full Text Available The application of food-specific IgG antibody detection in allergy dermatoses was explored. 181 patients with allergy dermatoses were diagnosed from January to September 2014 and 20 healthy subjects were selected. Fourteen kinds of food-specific IgG antibodies were detected by ELISA method among all the subjects. The positive rates of IgG antibody of the patient group and the healthy group were respectively 65.2% and 5.0%. The positive rates of IgG antibody of egg, milk, shrimp and crab took a large proportion in three groups of patients with three kinds of allergy dermatoses of urticaria, eczema and allergic dermatitis, the proportion of which was respectively 70.2%, 77.8% and 71.7%. Among urticaria and allergic dermatitis patients with positive antibody, the positive rate of children was significantly higher than that of adults (p0.05. Allergy dermatoses are closely related to food-specific IgG antibodies, and the allergy dermatoses patients have a high incidence rate of food intolerance; detecting IgG antibody in the serum of patients is of great significance for the diagnosis and treatment of allergy dermatoses.

La imprescriptibilidad de los crímenes contra la humanidad en Uruguay

Directory of Open Access Journals (Sweden)

José Manuel Sánchez Patrón

2014-06-01

Full Text Available La ratificación del Convenio sobre la imprescriptibilidad de los crímenes de guerra y de los crímenes de lesa humanidad por parte de Uruguay, constituye un primer paso dirigido a limitar la impunidad de los partícipes en la comisión de estas infracciones internacionales. Para la consecución de esta misma finalidad, el Estado Uruguayo ha dado un segundo paso, consistente en la ratificación del Estatuto de la Corte Penal Internacional, lo que ha llevado a efecto casi un año después del anterior. Ambas decisiones demuestran la intención de Uruguay de comprometerse Internacionalmente con el fin de evitar la impunidad de los responsables de la comisión de determinadas figuras delictivas, especialmente los crímenes de guerra y los crímenes contra la humanidad, ya que en tomo a estas dos infracciones internacionales gravitan los convenios internacionales a los que nos acabamos de referir.Contenido: imprescriptibilidad de los crímenes contra la humanidad en el pasado. Imprescriptibilidad de los crímenes contra la humanidad en el presente. Imprescriptibilidad de los crímenes contra la humanidad en el futuro. Conclusiones

Terapia combinada con Trastuzumab en el tratamiento del Cáncer de mama: eficacia y efectos adversos

OpenAIRE

Hernández Martín, María Sol

2015-01-01

Introducción: El cáncer de mama es el más frecuente entre la población femenina. Entre un 25-30% de los cánceres de mama son HER2-positivo. Este tipo de cáncer, se ha relacionado con una mayor agresividad clínica e histológica, mayor riesgo de recurrencia y muerte asociada al cáncer de mama. Trastuzumab, es un anticuerpo monoclonal humanizado contra este receptor. Actualmente se dispone de cuatro agentes anti-HER2 autorizados: Trastuzumab, Pertuzumab, Lapatinib y Trastuzumab...

Leptospirosis porcina: prevalencia serológica en establecimientos productores de la República Argentina

OpenAIRE

Petrakovsky M, Jessica; Tinao, Julio; Esteves M, Jorge

2013-01-01

RESUMENObjetivo. Detectar la presencia de anticuerpos contra Leptospira sp en cerdos que no presentaban sintomatología clínica, pertenecientes a establecimientos de producción porcina ubicados en todo el territorio de la República Argentina. Materiales y métodos. La asignación de predios y muestras se realizó en forma proporcional a los registrados en cada provincia a lo largo de todo el país. En total se estudiaron 1.524 predios, de los cuales se tomaron 19.872 muestras de suero y en la prim...

Prevalencia de leucemia viral felina, inmunodeficiencia viral felina y dirofilariosis felina en gatos refugiados en un albergue de animales en Maracaibo, Venezuela

OpenAIRE

Avila P., Nancy; Parra, Omaira; Barrios Mantilla, Liliana T.; Bello Gil, María del R.; Zambrano Guerrero, María Lourdes; González, Alberto

2015-01-01

A 95 gatos mestizos de ambos sexos, con edades comprendidas entre seis meses y un año, ubicados en un refugio de animales en el municipio Maracaibo, Venezuela, se les tomó muestra de sangre para realizar la detección del antígeno del virus de Leucemia Felina (vLF) y Dirofilaria inmitis (dirofilariosis felina) (DF), y anticuerpos contra el virus de Inmunodeficiencia viral felina (vIVF) a través de pruebas de SNAP® triple felino, además de realizar hemograma y detección de ...

Utilidad clinica de biomarcadores en el diagnóstico y tratamiento de la enfermedad glomerular del adulto

OpenAIRE

Jatem Escalante, Elias

2015-01-01

Con el presente proyecto de tesis, mediante el desarrollo de estudios observacionales con inclusión de grupos de pacientes afectos de formas primarias y secundarias de glomerulopatías causantes de síndrome nefrótico, específicamente gloméruloesclerósis focal y segmentaria,(GFS), y la nefropatía membranosa (NM), donde se practican mediciones séricas y urinarias de determinadas moléculas (receptor soluble de la urokinasa y anticuerpos contra el receptor tipo M de la fosfolipasa A2), para determ...

In-depth analysis of subclass-specific conformational preferences of IgG antibodies

DEFF Research Database (Denmark)

Tian, Xinsheng; Vestergaard, Bente; Thorolfsson, Matthias

2015-01-01

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 designe...... 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....

Monoclonal IgG in MGUS and multiple myeloma targets infectious pathogens

Science.gov (United States)

Bosseboeuf, Adrien; Feron, Delphine; Tallet, Anne; Rossi, Cédric; Charlier, Cathy; Garderet, Laurent; Caillot, Denis; Moreau, Philippe; Cardó-Vila, Marina; Pasqualini, Renata; Nelson, Alfreda Destea; Wilson, Bridget S.; Perreault, Hélène; Piver, Eric; Weigel, Pierre; Harb, Jean; Bigot-Corbel, Edith; Hermouet, Sylvie

2017-01-01

Subsets of mature B cell neoplasms are linked to infection with intracellular pathogens such as Epstein-Barr virus (EBV), hepatitis C virus (HCV), or Helicobacter pylori. However, the association between infection and the immunoglobulin-secreting (Ig-secreting) B proliferative disorders remains largely unresolved. We investigated whether the monoclonal IgG (mc IgG) produced by patients diagnosed with monoclonal gammopathy of undetermined significance (MGUS) or multiple myeloma (MM) targets infectious pathogens. Antigen specificity of purified mc IgG from a large patient cohort (n = 244) was determined using a multiplex infectious-antigen array (MIAA), which screens for reactivity to purified antigens or lysates from 9 pathogens. Purified mc IgG from 23.4% of patients (57 of 244) specifically recognized 1 pathogen in the MIAA. EBV was the most frequent target (15.6%), with 36 of 38 mc IgGs recognizing EBV nuclear antigen-1 (EBNA-1). MM patients with EBNA-1–specific mc IgG (14.0%) showed substantially greater bone marrow plasma cell infiltration and higher β2-microglobulin and inflammation/infection–linked cytokine levels compared with other smoldering myeloma/MM patients. Five other pathogens were the targets of mc IgG: herpes virus simplex-1 (2.9%), varicella zoster virus (1.6%), cytomegalovirus (0.8%), hepatitis C virus (1.2%), and H. pylori (1.2%). We conclude that a dysregulated immune response to infection may underlie disease onset and/or progression of MGUS and MM for subsets of patients. PMID:28978808

IgG4-related disease and its pathogenesis—cross-talk between innate and acquired immunity

Science.gov (United States)

Nakajima, Akio; Nakamura, Takuji; Kawanami, Takafumi; Tanaka, Masao; Dong, Lingli; Kawano, Mitsuhiro

2014-01-01

IgG4-related disease (IgG4-RD) is a novel clinical entity proposed in Japan in the 21th century and is attracting strong attention over the world. The characteristic manifestations of IgG4-RD are increased serum IgG4 concentration and tumefaction by IgG4+ plasma cells. Although the clinical manifestations in various organs have been established, the pathogenesis of IgG4-RD is still unknown. Recently, many reports of aberrant acquired immunity such as Th2-diminated immune responses have been published. However, many questions still remain, including questions about the pathogenesis of IgG4-RD and the roles of IgG4. In this review, we discuss the pathogenesis of IgG4-RD by focusing on the cross-talk between innate and acquired immunity. PMID:25024397

Literatura contra desarraigo.

Directory of Open Access Journals (Sweden)

Xosé A. Perozo Ruiz.

2008-01-01

Full Text Available Las reflexiones contenidas en Literatura contra desarraigo son una clara interpretación propia realizadas por Xosé A. Perozo. Nacidas del ejercicio literario constante y productivo nos acerca a conceptos actuales como el nacionalismo o la España de las Autonomías. Desde la lejanía, asistimos a la recuperación de la memoria social extremeña, que se trasluce en las novelas del autor son expuestas de manera biográfica en este artículo metaliterario, donde se detiene en la saga de Los Lancharro, o el personaje de Cerrato, ambientadas en la zona geográfica de la Campiña Sur de la Guerra Civil y posguerra.

Estudo piloto dos padrões de contração do músculo frontal

Directory of Open Access Journals (Sweden)

Andre Vieira Braz

2010-09-01

Full Text Available Introdução: Características anatômicas distintas e espectros cinéticos variados determinam padrões de contração da musculatura frontal peculiares a cada pessoa.Objetivo: Identificar e classificar os padrões de contração da musculatura frontal depacientes que procuraram atendimento para tratamento de rugas frontais.Métodos: Análise retrospectiva de fotografias de 83 pacientes. O padrão de contraçãomuscular foi classificado de acordo com a área hipercinética predominante, observada nafotografia em contração máxima do músculo frontal.Resultados: Foram identificados três padrões de contração: total, medial e lateral. Opadrão total foi observado em 50,6% dos casos.As rítides horizontais presentes no centroda fronte avançam lateralmente além da linha mediopupilar, até o final da cauda dassobrancelhas. O padrão medial foi observado em 25,3% dos casos.As rítides horizontaisconcentram-se na região central da fronte, contidas predominantemente entre as linhasmediopupilares. O padrão lateral foi observado em 24% dos casos.As rítides horizontaispredominam nas laterais da fronte, a maioria ocorrendo após a linha mediopupilar.Conclusões: A identificação e classificação dos padrões de contração do músculo frontalpermitem avaliação mais individualizada de cada paciente, o que é um dos pilares maisimportantes para um plano terapêutico bem-sucedido.

Circulating plasmablasts/plasma cells: a potential biomarker for IgG4-related disease.

Science.gov (United States)

Lin, Wei; Zhang, Panpan; Chen, Hua; Chen, Yu; Yang, Hongxian; Zheng, Wenjie; Zhang, Xuan; Zhang, Fengxiao; Zhang, Wen; Lipsky, Peter E

2017-02-10

Immunoglobulin G4 (IgG4)-related disease (IgG4-RD) is a multisystem fibroinflammatory disease. We previously reported that a circulating cell population expressing CD19 + CD24 - CD38 hi was increased in patients with IgG4-RD. In this study, we aimed to document that this cell population represented circulating plasmablasts/plasma cells, to identify the detailed phenotype and gene expression profile of these IgG4-secreting plasmablasts/plasma cells, and to determine whether this B-cell lineage subset could be a biomarker in IgG4-related disease (IgG4-RD). A total of 42 untreated patients with IgG4-RD were evaluated. Peripheral B-cell subsets, including CD19 + CD24 - CD38 hi plasmablasts/plasma cells, CD19 + CD24 + CD38 - memory B cells, CD19 + CD24 int CD38 int naïve B cells, and CD19 + CD24 hi CD38 hi regulatory B cells, were assessed and sorted by flow cytometry. Microarray analysis was used to measure gene expression of circulating B-cell lineage subsets. Further characterization of CD19 + CD24 - CD38 hi plasmablasts/plasma cells was carried out by evaluating additional surface markers, including CD27, CD95, and human leukocyte antigen (HLA)-DR, by flow cytometric assay. In addition, various B-cell lineage subsets were cultured in vitro and IgG4 concentrations were measured by cytometric bead array. In untreated patients with IgG4-RD, the peripheral CD19 + CD24 - CD38 hi plasmablast/plasma cell subset was increased and positively correlated with serum IgG4 levels, the number of involved organs, and the IgG4-related Disease Responder Index. It decreased after treatment with glucocorticoids. Characterization of the plasmablast/plasma cell population by gene expression profiling documented a typical plasmablast/plasma cell signature with higher expression of X-box binding protein 1 and IFN regulatory factor 4, but lower expression of paired box gene 5 and B-cell lymphoma 6 protein. In addition, CD27, CD95, and HLA-DR were highly expressed on CD19 + CD24 - CD38 hi

Exposure to occupational antigens might predispose to IgG4-related disease

NARCIS (Netherlands)

de Buy Wenniger, Lucas J. Maillette; Culver, Emma L.; Beuers, Ulrich

2014-01-01

Evidence is mounting that the immune system of patients with IgG4-related disease (IgG4-RD) shows indications of chronic antigenic stimulation. Hypothesizing a possible role for occupational antigenic exposure, we observed in two independent cohorts of patients with IgG4-RD that the majority had had

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. Copyright © 2016 by The American Association of Immunologists, Inc.

Case report: A female case of isolated IgG4-related sclerosing cholangitis mimicking cholangiocarcinoma.

Science.gov (United States)

Xiao, Jianchun; Li, Guanqiao; Yang, Gang; Jia, Congwei; Li, Binglu

2017-04-01

IgG4-related disease is a newly recognized fibroinflammatory disorder, characterized by tumefactive lesions, storiform fibrosis and IgG4-positive plasma cells infiltration. IgG4-related sclerosing cholangitis (IgG4-SC) is the most common extrapancreatic manifestation of IgG4-related disease, but it is frequently associated with autoimmune pancreatitis(AIP). Only few case was reported to be diagnosed with IgG4-SC in the absence of AIP, with a striking male preponderance. Here we report a female case of isolated IgG4 related sclerosing cholangitis mimicking cholangiocarcinoma. A 58-year-old woman complaint of one-month history of jaundice and right upper quadrant discomfort, and the biliary reconstruction showed full-length wall thickening and segmental stenosis. Cholangiocarcinoma was then diagnosed. Choledochoplasty was performed, followed by Roux-en-Y anastomosis. However, pathological examination revealed IgG4-related sclerosing cholangitis (IgG4-SC) and the retrospective measurement of serum IgG4 was 346 mg/dL post-operatively. The patient was followed for another nine monthswithout recurrence. The differential diagnosis between cholangiocarcinoma and IgG4-SC is challenging due to significant overlap of clinical manifestations, lab tests and imaging characteristics. However, as an afterthought of this case, typical cholangiocarcinoma rarely presents full-length wall thickening. What the case taught us was pre-operative IgG4 measurement for patients with long bile duct involvement was highly recommended in order to rule out IgG4-SC.

Estado de salud y violencia contra la mujer en la pareja

OpenAIRE

Belén Sanz-Barbero; Lourdes Rey; Laura Otero-García

2014-01-01

Objetivo: Describir la prevalencia de violencia contra la mujer en la pareja en España, sus determinantes durante el último año y alguna vez en la vida. Describir el estado de salud de las mujeres según hayan sufrido o no violencia en la pareja. Analizar las variables individuales asociadas a la violencia contra la mujer en la pareja en España. Métodos: Estudio transversal de la Macroencuesta de Violencia de Género 2011, que incluyó 7898 mujeres mayores de 18 años. Variables dependientes: ...

IgG4-related pleural disease presenting as a massive bilateral effusion.

Science.gov (United States)

Ishida, Atsuko; Furuya, Naoki; Nishisaka, Takashi; Mineshita, Masamichi; Miyazawa, Teruomi

2014-07-01

A 74-year-old woman with massive bilateral pleural effusion, which was exudative in nature, and with mononuclear cell predominance underwent a pleuroscopy. Parietal pleura were thickened and partly reddish in color. Biopsy specimens taken from the parietal pleura revealed lymphoplasmacytic inflammation with fibrosis. As her performance status rapidly worsened with thoracentesis, we performed bilateral pleurodesis using talc. Pathologic evaluation of the pleural biopsy specimen with immunohistochemical staining revealed 91 IgG4-positive plasma cells per high-power field and an IgG4/IgG ratio of 91%. Thus, the diagnosis of pleuritis from IgG4-related disease was established. Our case suggests that IgG4-related disease is one of the causes of pleural effusion, and it should be included in the differential diagnosis of unexplained pleuritis.

Prohibitin Is Involved in Patients with IgG4 Related Disease.

Directory of Open Access Journals (Sweden)

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.

Prevalência de anticorpos IgG antiparvovírus B19 em gestantes durante o atendimento pré-natal e casos de hidropisia fetal não imune atribuídos ao parvovírus B19, na Cidade do Rio de Janeiro Anti-parvovirus B19 IgG antibody prevalence in pregnant women during antenatal follow-up and cases of non-immune hydropsis fetalis due to parvovirus B19, in the City of Rio de Janeiro

Directory of Open Access Journals (Sweden)

André Ricardo Araujo da Silva

2006-10-01

Full Text Available Com o objetivo de medir a prevalência de anticorpos IgG contra o parvovírus B19 em gestantes com até 24 semanas de idade gestacional e detectar a ocorrência de casos de hidropisia fetal não-imune atribuídos a esse vírus, coletamos 249 amostras de soro em uma maternidade de referência na cidade do Rio de Janeiro, entre junho de 2003 e março de 2005. As gestantes foram acompanhadas até o termo da gestação, sendo detectados 17 casos de hidropisia fetal. Quatro casos foram atribuídos ao parvovírus B19 e dois destes ocorreram em gestantes residentes na zona oeste da cidade, em fevereiro de 2005. Resultados positivos para anticorpos IgG antiparvovírus B19 foram encontrados em 172 (71,6% gestantes (IC 95% 65,5-77,7%, sendo esta prevalência de anticorpos comparável à encontrada em outras cidades brasileiras. A única variável associada com aquisição prévia de anticorpos IgG foi número de gestações anteriores maior que um(p= 0,02, IC 95% 0,36-0,94.With the aim of measuring the prevalence of anti-parvovirus B19 IgG antibodies during pregnancy up to 24 weeks of gestation and detecting cases of nonimmune hydrops fetalis, 249 sera from pregnant women attending a reference hospital in Rio de Janeiro city, from June 2003 to November 2004 were collected. They were followed-up until the end of pregnancy, with 17 cases of fetal hydrops detected. Four cases were caused by parvovirus B19 and two of them occurred in pregnant women living in the western zone of the city, during February 2005. Anti-parvovirus B19 IgG antibodies were found in 172 (71.6% pregnant women (CI 95% 65.5%-77.7%; this antibody prevalence is similar to results found for others Brazilian cities. The only variable associated with previous acquisition of IgG antibodies to parvovirus B19 was number of pregnancies greater than one (p= 0.02, CI 95% 0.36-0.94.

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

Rugas glabelares: estudo piloto dos padrões de contração

Directory of Open Access Journals (Sweden)

Ada Regina Trindade de Almeida

2010-03-01

Full Text Available Introdução: A atividade muscular nd glabela Provocação rugas perpendiculares à Direção decontração dos Músculos, hoje tratadas Pela toxina botulínica.Variações interpessoais nd forma de contração local, São exibidas Durante a Animação facial. Apesar dos Inúmeros artigos publicados Sobre o tema, Os padrões de contração glabelar Ainda Não Foram estudados adequadamente e Classificados. Objetivo: Identificar e classificar Os padrões de contração glabelar encontrados Na população Que recebe Tratamento cosmético toxina botulínica com.Métodos: Análise retrospectiva de Fotografías de 30 pacientes receberam toxina botulínica n Que glabelares Tratamento de rugas. De acordo com De hum Predominância de Movimentosde Depressão, Aproximação OU Elevação da glabela, Os padrões de contração Foram identificados e Classificados.Resultados: Cinco Padrões identificados foram: 1 "U", 2 "V", 3 "Omega", 4 "Setas convergentes" e 5 "Omega" invertido. A Classificação OS permitiu identificar Músculos Mais Importantes em CADA Padrão de contração.Discussão CONCLUSÃO /: Existem Diferenças interpessoais nd Animação facial. A Classificação das rugas glabelares Permite, Tratamento Mais INDIVIDUALIZADO com acurado e toxina botulínica Uma. recebem doses Mais Músculos recrutados Maiores OU Maior numero de Pontos de Aplicação. Os Menos requisitados poupados São OU recebem doses menores, permitindo resultados eficazes Mais e Naturais.

Canakinumab: un anticuerpo monoclonal prometedor en el tratamiento de enfermedades cardiovasculares Canakinumab: a promising monoclonal antibody in the treatment of cardiovascular diseases

Directory of Open Access Journals (Sweden)

Fernando Manzur

2013-02-01

Full Text Available El canakinumab es un anticuerpo monoclonal anti-IL-1β totalmente humano desarrollado por Novartis, cuyo mecanismo de acción se basa en la neutralización de la señalización IL-1β, lo cual conduce a la supresión de la inflamación en pacientes con trastornos de origen autoinmune. La IL-1β actúa como un mediador de la respuesta inmune periférica durante la infección y la inflamación. Mediante la unión antígeno-anticuerpo el canakinumab inhibe la acción de la IL1-β evitando sus efectos pro-inflamatorios. En la actualidad, está en evaluación como un nuevo posible agente dirigido frente a la IL-1β, con el objetivo de reducir la tasa de eventos cardiovasculares y la diabetes de aparición reciente (estudio CANTOS.Canakinumab is a totally human monoclonal antibody anti-IL-1β developed by Novartis, whose mode of action is based on the neutralization of IL-1β signaling, which leads to suppression of inflammation in patients with autoimmune disorders. The IL-1β acts as a mediator of the peripheral immune response during infection and inflammation. By the antigen-antibody binding, canakinumab inhibits the action of IL1-β avoiding its pro-inflammatory effects. Currently, it is being evaluated as a new possible agent directed against IL-1β, with the goal of reducing the rate of cardiovascular events and new onset diabetes (study CANTOS.

Violência contra idosos: uma questão nova?

Directory of Open Access Journals (Sweden)

Ana Paula R. Amadio Sanches

Full Text Available O envelhecimento da população mundial é um fato concreto e de conhecimento público. O Brasil inicia seu processo de transição demográfica seguindo o padrão mundial: o aumento do número de idosos com possibilidade de atingir elevadas faixas etárias, o que traz a necessidade de pesquisas nesse campo, devido à demanda apresentada por essa nova parcela da população. A questão da violência doméstica contra idosos tem se ampliado e sugere necessidade de maior campo de investigação nessa área, dado o risco suposto ao qual essa população mais idosa está submetida. O objetivo deste artigo é verificar os estudos relacionados ao tema já realizados no Brasil e em diferentes países, com enfoque epidemiológico. O trabalho apresenta diversos pontos de abordagem da violência contra idosos, considerando questões relacionadas à cultura do envelhecimento, ações de políticas públicas, atuação de equipes de saúde, definição do termo abordado, aspectos legais e éticos da violência contra o idoso. Tal estudo permite ao pesquisador analisar os diferentes aspectos que envolvem a temática, demonstrando a necessidade de pesquisas específicas direcionadas ao tema.

Antineutrophil cytoplasmic antibody-associated vasculitides and IgG4-related disease: A new overlap syndrome.

Science.gov (United States)

Danlos, François-Xavier; Rossi, Giovanni Maria; Blockmans, Daniel; Emmi, Giacomo; Kronbichler, Andreas; Durupt, Stéphane; Maynard, Claire; Luca, Luminita; Garrouste, Cyril; Lioger, Bertrand; Mourot-Cottet, Rachel; Dhote, Robin; Arlet, Jean-Benoit; Hanslik, Thomas; Rouvier, Philippe; Ebbo, Mikael; Puéchal, Xavier; Nochy, Dominique; Carlotti, Agnès; Mouthon, Luc; Guillevin, Loïc; Vaglio, Augusto; Terrier, Benjamin

2017-10-01

Atypical manifestations have been described in patients with ANCA-associated vasculitides (AAV), such as pachymeningitis, orbital mass or chronic periaortitis. Because these manifestations have been associated to the spectrum of IgG4-related disease (IgG4-RD), we hypothesized that both diseases could overlap. We conducted a European retrospective multicenter observational study including patients fulfilling ACR and Chapel Hill criteria for AAV and IgG4-RD Comprehensive Diagnostic Criteria. Eighteen patients were included (median age 55.5years, 13 men). AAV and IgG4-RD were diagnosed concomitantly in 13/18 (72%) patients; AAV preceded IgG4-RD in 3/18 (17%) while IgG4-RD preceded AAV in 2/18 (11%). AAV diagnoses included granulomatosis with polyangiitis in 14 (78%), microscopic polyangiitis in 3 (17%), and eosinophilic granulomatosis with polyangiitis in one case. IgG4-RD diagnosis included definite IgG4-RD in 5 (28%) cases, probable IgG4-RD in 5 (28%) and possible IgG4-RD in 8 (44%). IgG4-RD manifestations were chronic periaortitis in 9/18 (50%) patients, orbital mass and tubulointerstitial nephritis in 4 (22%) cases, prevertebral fibrosis in 3 (17%), pachymeningitis and autoimmune pancreatitis in 2 (11%) cases. Patients required median number of 2 (range 0-4) lines of immunosuppressants in combination with glucocorticoids. During the follow-up (median 49,8months, range 17,25-108months), AAV manifestations relapsed in 10/18 (56%) cases and IgG4-RD lesions in 5/18 (28%). When used, mainly for relapses, rituximab showed response in all cases. AAV and IgG4-RD may overlap. Clinicians should consider that atypical manifestations during AAV could be related to IgG4-RD rather than to refractory granulomatous or vasculitic lesions. Copyright © 2017 Elsevier B.V. All rights reserved.

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.

Associations between an IgG3 polymorphism in the binding domain for FcRn, transplacental transfer of malaria-specific IgG3, and protection against Plasmodium falciparum malaria during infancy: A birth cohort study in Benin.

Directory of Open Access Journals (Sweden)

Celia Dechavanne

2017-10-01

Full Text Available Transplacental transfer of maternal immunoglobulin G (IgG to the fetus helps to protect against malaria and other infections in infancy. Recent studies have emphasized the important role of malaria-specific IgG3 in malaria immunity, and its transfer may reduce the risk of malaria in infancy. Human IgGs are actively transferred across the placenta by binding the neonatal Fc receptor (FcRn expressed within the endosomes of the syncytiotrophoblastic membrane. Histidine at position 435 (H435 provides for optimal Fc-IgG binding. In contrast to other IgG subclasses, IgG3 is highly polymorphic and usually contains an arginine at position 435, which reduces its binding affinity to FcRn in vitro. The reduced binding to FcRn is associated with reduced transplacental transfer and reduced half-life of IgG3 in vivo. Some haplotypes of IgG3 have histidine at position 435. This study examines the hypotheses that the IgG3-H435 variant promotes increased transplacental transfer of malaria-specific antibodies and a prolonged IgG3 half-life in infants and that its presence correlates with protection against clinical malaria during infancy.In Benin, 497 mother-infant pairs were included in a longitudinal birth cohort. Both maternal and cord serum samples were assayed for levels of IgG1 and IgG3 specific for MSP119, MSP2 (both allelic families, 3D7 and FC27, MSP3, GLURP (both regions, R0 and R2, and AMA1 antigens of Plasmodium falciparum. Cord:maternal ratios were calculated. The maternal IgG3 gene was sequenced to identify the IgG3-H435 polymorphism. A multivariate logistic regression was used to examine the association between maternal IgG3-H435 polymorphism and transplacental transfer of IgG3, adjusting for hypergammaglobulinemia, maternal malaria, and infant malaria exposure. Twenty-four percent of Beninese women living in an area highly endemic for malaria had the IgG3-H435 allele (377 women homozygous for the IgG3-R435 allele, 117 women heterozygous for the IgG

IgG4-related disease: a systemic condition with characteristic microscopic features

DEFF Research Database (Denmark)

Detlefsen, Sönke

2013-01-01

that a significant proportion of the AIP patients had a variety of extrapancreatic fibroinflammatory lesions, and that AIP therefore was the pancreatic manifestation of a systemic disease. Among these extrapancreatic manifestations, the extrahepatic bile ducts, salivary glands, thyroid, lymph nodes......During the first decade of the 21st century, IgG4-related disease (IgG4-RD), a fibroinflammatory condition occurring at multiple sites of the body, has been newly recognized. As indicated by its name, elevation of IgG4 in the serum and tissue is a common denominator of IgG4-RD. Since...... diseases on their own, others have been included under the umbrella of "multifocal fibrosclerosis". Biopsies or resection specimens from affected organs in IgG4-RD reveal several common microscopic features irrespective of the site of the lesion. Cellular and storiform fibrosis, lymphoplasmacytic...

Tutela contra sentencias de las altas cortes o choque de vanidades

Directory of Open Access Journals (Sweden)

Rubén Darío Henao Orozco

2006-01-01

Full Text Available La acción de tutela – o el llamado recurso de amparo o recurso de constitucionalidad- contra sentencias constituye uno de los ejes centrales de todo el sistema de garantía de los derechos 1 fundamentales.” Se limita el tema a la tutela contra sentencias de las Altas Cortes, porque ya es claro y no suscita ninguna controversia, el amparo contra sentencias emanadas por los Tribunales de Distrito Judicial, Contencioso Administrativos y los demás Jueces de la República. En cambio, cuando se produce una acción de tutela que protege derechos fundamentales vulnerados por una sentencia de una Alta Corte, la Corte accionada se rasga las vestiduras y protagoniza el respectivo espectáculo ante los medios de comunicación, y el argumento que inequívocamente trae a cuento en este show publicitario, es que dicha Corporación es un órgano límite y sus competencias emanan de la Constitución Política, además de ser exclusivas y excluyentes.

Increased number of IgG4-positive plasma cells in chronic rhinosinusitis.

Science.gov (United States)

Ohno, Keiko; Kimura, Yurika; Matsuda, Yoko; Takahashi, Masatoki; Honjyou, Motomu; Arai, Tomio; Tsutsumi, Takeshi

2017-02-01

High levels of IgG4-positive plasma cells were observed in tissue samples from ∼30% of patients with chronic rhinosinusitis who satisfied the comprehensive diagnostic criteria for IgG4-related disease. Detection of increased numbers of IgG4-positive plasma cells in the nasal cavity or paranasal sinuses might not be sufficient to make a diagnosis of IgG4-related rhinosinusitis, and a comprehensive evaluation is required. This study aimed to clarify the clinicopathological characteristics of IgG4-positive plasma cells in patients with chronic rhinosinusitis. This study examined nasal mucosal specimens from 35 patients and assigned them to high-IgG4 and low-IgG4 groups based on infiltration of IgG4-positive plasma cells. It compared the pathological characteristics of the two groups, including the presence of fibrosis, phlebitis, hyperplasia of the nasal glands and infiltration of inflammatory cells. No cases of chronic rhinosinusitis showed storiform fibrosis or obliterative phlebitis. The mean number of IgG4-positive plasma cells in samples from all patients was 29.8 ± 40.3/high-power field. Eleven of the 35 cases (31.4%) were classified as high-IgG4. Hyperplasia of the nasal glands was observed significantly more frequently in the high-IgG4 group than in the low-IgG4 group (p = .03).

El estado actual de las vacunas contra las drogas

Directory of Open Access Journals (Sweden)

Maura Epifanía Matus Ortega

2017-12-01

Full Text Available Introducción: por lo común, la adicción a las drogas se trata con psicoterapia y farmacología que evita la unión de las sustancias psicoactivas a receptores específicos en el cerebro. El resultado de estos tratamientos no ha sido del todo satisfactorio, por lo que el desarrollo de terapias más eficaces representa un reto constante para tratar las adicciones. Una alternativa a la farmacología antiadictiva es la vacunación activa dirigida contra las sustancias de abuso. Objetivo: esta revisión reúne la información disponible sobre los fundamentos y avances científicos en la generación de una terapia inmunológica, que coadyuve al tratamiento de la adicción a sustancias como la heroína-morfina, la cocaína, la nicotina y la anfetamina. Método: se consideraron los reportes científicos disponibles en PubMed –de 2005 a abril de 2017–, sobre los fundamentos, la metodología empleada, los estudios preclínicos y clínicos, y los resultados obtenidos en dichas investigaciones para generar vacunas contra las drogas. Resultados: las vacunas lograron mitigar los efectos producidos por las sustancias en los estudios preclínicos en modelos de estudio en animales; sin embargo, con pacientes humanos los resultados no han sido del todo satisfactorios. Discusión y conclusiones: a pesar de los esfuerzos realizados por diferentes grupos de investigación y compañías farmacéuticas para generar vacunas terapéuticas contra el uso de diferentes drogas, ninguna ha alcanzado la fase III de estudios clínicos. En la actualidad, se continúa con los esfuerzos para lograr que las vacunas contra las adicciones alcancen su máxima eficiencia y eficacia, y contribuyan al tratamiento de la adicción a las drogas.

Thoracic Paravertebral Mass as an Infrequent Manifestation of IgG4-Related Disease

Directory of Open Access Journals (Sweden)

Melissa Matzumura Kuan

2017-01-01

Full Text Available Case. A 50-year-old African American male presented with abdominal pain and significant weight loss. On physical examination, he had parotid and submandibular gland enlargement associated with right eye proptosis. Computed tomography showed a thoracic paravertebral soft tissue mass, enlarged lymph nodes, and ascending aortic aneurysm. Laboratory results were remarkable for elevated total IgG and IgG4 subclass. The submandibular gland pathology revealed chronic sclerosing sialadenitis, with a large subset of inflammatory cells positively staining for IgG4. The histology of the paravertebral mass demonstrated fibrosclerosis with increased lymphocytic infiltrate, associated with increased IgG4 plasma cells. He was diagnosed with immunoglobulin G4-related disease (IgG4-RD. Steroid therapy initially yielded improvement; however, after steroids were stopped, there was disease recurrence. Prednisone was restarted, and the plan was to start him on rituximab. Interestingly, the patient’s brother also had IgG4-RD. Conclusion. IgG4-RD can present as a paravertebral mass which is usually responsive to steroids; however, recurrent and resistant disease can be seen for which steroid-sparing agents such as rituximab should be considered. In addition, to the best of our knowledge, this is the first reported case of IgG4-RD in two family members presenting as a paravertebral mass, highlighting an exciting area for more research in the future.

IgG4-related Pleuritis with Elevated Adenosine Deaminase in Pleural Effusion: A Case Report.

Science.gov (United States)

Nagayasu, Atsushi; Kubo, Satoshi; Nakano, Kazuhisa; Nakayamada, Shingo; Iwata, Shigeru; Miyagawa, Ippei; Fukuyo, Shunsuke; Saito, Kazuyoshi; Tanaka, Yoshiya

2018-03-09

An 81-year-old man was admitted with bilateral pleural effusion. A clinical examination showed lymphocytic pleura effusion and elevated serum IgG4 levels, so that IgG4-related disease was suggested, whereas tuberculous pleurisy was suspected because of high adenosine deaminase (ADA) levels in the pleural effusion. A surgical pleural biopsy revealed that there were large numbers of IgG4-positive cells and IgG4/IgG positive cell ratio exceeded 40% in several sites. Accordingly, we diagnosed IgG4-related pleuritis and treated with the patient with glucocorticoid therapy. The ADA levels in pleural effusion can increase in IgG4-related pleuritis, and it is therefore important to perform a pleural biopsy.

Enterocolic lymphocytic phlebitis as a newly recognized manifestation of IgG4-related disease.

Science.gov (United States)

Laco, Jan; Örhalmi, Július; Bártová, Jolana; Zimandlová, Dana

2015-04-01

Herein we present a case of a 65-year-old woman with enterocolic lymphocytic phlebitis (ELP) who presented with anemic syndrome and in whom severe stenosis of the right flexure of large bowel was detected. The microscopic examination revealed fibrosis of the submucosa and lymphoplasmacytic phlebitis of small veins and venules, whereas arteries were spared. There were 110 IgG4-positive and 160 IgG-positive plasma cells in 1 high-power field, respectively, with corresponding IgG4/IgG ratio of 0.69. The IgG4 serum level was 2.42 g/L. According to the currently proposed criteria, this ELP case is the first that may be diagnosed as definite IgG4-related disease (IgG4-RD). Although based on the sole case description, taken together with a recent review and a case report, we presume that a subset of ELPs is a manifestation of IgG4-RD. © The Author(s) 2014.

Internal Flow of Contra-Rotating Small Hydroturbine at Off- Design Flow Rates

Science.gov (United States)

SHIGEMITSU, Toru; TAKESHIMA, Yasutoshi; OGAWA, Yuya; FUKUTOMI, Junichiro

2016-11-01

Small hydropower generation is one of important alternative energy, and enormous potential lie in the small hydropower. However, efficiency of small hydroturbines is lower than that of large one. Then, there are demands for small hydroturbines to keep high performance in wide flow rate range. Therefore, we adopted contra-rotating rotors, which can be expected to achieve high performance. In this research, performance of the contra-rotating small hydroturbine with 60mm casing diameter was investigated by an experiment and numerical analysis. Efficiency of the contra-rotating small hydroturbine was high in pico-hydroturbine and high efficiency could be kept in wide flow rate range, however the performance of a rear rotor decreased significantly in partial flow rates. Then, internal flow condition, which was difficult to measure experimentally, was investigated by the numerical flow analysis. Then, a relation between the performance and internal flow condition was considered by the numerical analysis result.

[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.

Absolute Quantitation of Glycoforms of Two Human IgG Subclasses Using Synthetic Fc Peptides and Glycopeptides

Science.gov (United States)

Roy, Rini; Ang, Evelyn; Komatsu, Emy; Domalaon, Ronald; Bosseboeuf, Adrien; Harb, Jean; Hermouet, Sylvie; Krokhin, Oleg; Schweizer, Frank; Perreault, Hélène

2018-05-01

Immunoglobulins, such as immunoglobulin G (IgG), are of prime importance in the immune system. Polyclonal human IgG comprises four subclasses, of which IgG1 and IgG2 are the most abundant in healthy individuals. In an effort to develop an absolute MALDI-ToF-MS quantitative method for these subclasses and their Fc N-glycoforms, (glyco)peptides were synthesized using a solid-phase approach and used as internal standards. Tryptic digest glycopeptides from monoclonal IgG1 and IgG2 samples were first quantified using EEQYN(GlcNAc)STYR and EEQFN(GlcNAc)STFR standards, respectively. For IgG1, a similar glycopeptide where tyrosine (Y) was isotopically labelled was used to quantify monoclonal IgG1 that had been treated with the enzyme Endo-F2, i.e., yielding tryptic glycopeptide EEQYN(GlcNAc)STYR. The next step was to quantify single subclasses within polyclonal human IgG samples. Although ion abundances in the MALDI spectra often showed higher signals for IgG2 than IgG1, depending on the spotting solvent used, determination of amounts using the newly developed quantitative method allowed to obtain accurate concentrations where IgG1 species were predominant. It was observed that simultaneous analysis of IgG1 and IgG2 yielded non-quantitative results and that more success was obtained when subclasses were quantified one by one. More experiments served to assess the respective extraction and ionization efficiencies of EEQYNSTYR/EEQFNSTFR and EEQYN(GlcNAc)STYR/EEQFN(GlcNAc)STFR mixtures under different solvent and concentration conditions.

IgG4-related hypophysitis is highly prevalent among cases of histologically confirmed hypophysitis.

Science.gov (United States)

Bernreuther, Christian; Illies, Christopher; Flitsch, Jörg; Buchfelder, Michael; Buslei, Rolf; Glatzel, Markus; Saeger, Wolfgang

2017-11-01

IgG4-related disease is an immune-mediated disease with manifestations in most organ systems among them the pituitary gland. To date, few cases of histologically confirmed cases of IgG-related hypophysitis have been reported. The aim of this study was to retrospectively determine the prevalence of IgG4-related hypophysitis among cases previously diagnosed as primary hypophysitis (lymphocytic hypophysitis, granulomatous hypophysitis and hypophysitis not otherwise specified). Histological and immunohistochemical analysis revealed that 12 of 29 cases (41.4%) previously diagnosed as primary hypophysitis fulfilled the criteria for IgG4-related disease and, thus, IgG4-related hypophysitis should always be considered in the differential diagnosis of primary hypophysitis. All cases of IgG4-related hypophysitis showed a dense lymphoplasmacytic infiltrate with more than 10 IgG4-positive cells per high power field and a ratio of IgG4/IgG-positive cells of more than 40%, whereas storiform fibrosis was an inconsistent histological feature and was also seen in few cases of non-IgG-related hypophysitis, thus lacking sensitivity and specificity. Obliterative phlebitis was not seen in any case. Thus, histological criteria defined for IgG4-related disease in other organs should be modified for IgG4-related hypophysitis, accordingly. © 2016 International Society of Neuropathology.