Sample records for precipitins
from WorldWideScience.org

Sample records 1 - 3 shown.



2

Imunidade e permeabilidade celular

Lagôa, F. da Rocha
1945-12-01

Resumo em inglês After going through the more important theories on cellular permeability, researches were undertaken with the purpose of proving the actual influence of the various degrees of cellular permeability on the phenomena of organic resistance against infections, and on the production of antibodies. Three groups of substances known to have action on cellular permeability were used; the first consisting of the following permeable substances: testos-terona, acetylcholine, and the (mais) spreading-factor of the staphyloccocus. The second group included substances which help in developing low cellular permeability: atropin, adrenalin and calcium. Finally, the third group consisted of a substance which helps to maintain normal permeability: cortin (an extract of the suprarenal cortex). In order to study the process developed by these elements with regard to organic resistance against infections, adult mice were inoculated with the following germs: K. pneumoniae, P. aeruginosa, S. enteriditis and D. pneumoniae, in the smallest possible amount capable of starting a mortal sep infection in approximately 24 hours, exception made of D. pneumonias which causes death in 48 hours. The animals were divided into groups of 10, a before taking the injections containing the germs, they were given the sub lances under observation, through their peritoneum of intramuscularly. T. animals that died were autopsied and blood was taken from their hearts an aseptic process so as not to introduce extraneous organisms. For the purpose of determining the development of antibodies (hem lysins, precipitins and aglutinins), rabbits were used, which had been prep ously immunized by a treatment consisting of 6 intravenous injections of polyvolent antigen made of sheep blood cells, fresh human serum, and of suspension of S. enteriditis. It was concluded that: Cellular permeability plays a very important part in the development infections. Permeable substances help the development of germ infections. Substances helping to develop low permeability proved not to have any influence worth mentioning. Substances helping to maintain normal permeability, such as coffin, it crease resistance against infections. The different substances used which have action on cellular permeability had no influence worth mentioning on the development of certain ant bodies (hemolysins, precipitins and aglutinins). It was admitted that the phenomena under study relative to resistance against infections are closely connected to the dynamics of the cellular elements, which circumstance is basically dependent on the permeability of Citations of cells.

Scientific Electronic Library Online (Portuguese)

3

Atopia e auto-imunidade: A propósito de um caso clínico/ Atopy and autoimmunity: A case report

Alfaro, M; Tapadinhas, F; Neves, AM; Trindade, J Costa
2007-09-01

Resumo em português Atopia, imunodeficiência e auto- imunidade são manifestações de disfunção do sistema imunológico. A atopia e a auto-imunidade são classicamente referidas como reacções imunológicas distintas. Estudos recentes sugerem a existência de possíveis mecanismos patogénicos comuns. Descrevemos o caso de uma adolescente com antecedentes familiares de asma brônquica e de miastenia gravis materna (HLA-B8) e com antecedentes pessoais de infecções respiratórias altas (mais) de repetição dos dois aos quatro anos, iniciando as pneumonias desde os cinco anos (3-4 por ano, em 3 anos consecutivos), associados a dispneia e hipoxemia, necessitando com frequência de internamento hospitalar. Na investigação efectuada os marcadores de atopia revelaram-se inicialmente negativos, sendo excluídas outras hipóteses, como tuberculose, fibrose quística, défice de α-1 anti-tripsina, cardiopatia congénita, malformações broncopulmonares ou aspiração de corpo estranho. Mais tarde, a repetição das análises confirmou finalmente atopia com IgE, RAST e testes de sensibilidade cutânea positivos (ácaros e pólenes). Foram detectados imunocomplexos circulantes e défice de IgG2, 3 e 4. O estudo dos auto-anticorpos mais frequentes e das precipitinas foi negativo e o estudo dos antigénios de histocompatibilidade revelou a presença de HLA-B8 (idêntico ao materno). A cintigrafia de ventilação-perfusão e as provas de função respiratória foram normais. Fez terapêutica com anti-histamínicos, corticóides tópicos e broncodilatadores, verificando-se a diminuição progressiva do número de infecções respiratórias e boa evolução clínica. Aos 16 anos voltou a ser internada, desta vez com o diagnóstico de eritema nodoso e suspeita clínica de sindroma de Sweet, com boa evolução. A relação entre atopia e auto-imunidade é enfatizada pelos autores, não correspondendo a sua ocorrência concomitante a uma associação meramente estatística, mas a um desequilíbrio global do sistema imunológico, com envolvimento simultâneo de diferentes tipos de hipersensibilidade. Resumo em inglês Atopy, immunodeficiency and autoimmunity are manifestations of immune system dysfunction. Classically atopy and autoimmunity are referred as distinct immunological reactions. Recent studies suggest the existence of common pathogenic mechanisms. We report the case of a teenager with familial history of asthma and miasthenia gravis in her mother (HLAB8+) and personal history of recurrent upper respiratory infections from two to four years old, and pneumonia since five years (mais) old (3 or 4 episodes/ year, in three consecutive years), with associated dyspnoea and hypoxemia, requiring frequently hospital admission. Investigation was initially negative for atopy markers, and excluded other hypothesis as tuberculosis, cystic fibrosis, α-1 antitrypsin deficiency, congenital heart disease, bronchopulmonary malformations or foreign body aspiration. Latter, further exams finally confirmed atopy with a rised IgE, positive RAST and cutaneous sensitivity tests (for house dust mites and pollen) and revealed circulating immune complexes and IgG 2, 3 e 4 deficit. Most frequent autoantibodies and precipitins study were negative, and histocompatibility antigens study revealed HLA- B8 (as her mother). Ventilation-perfusion scintigraphy and respiratory function tests were normal. Antihistamines, topical corticoids and bronchodilators were done with an excellent clinical response. At 16 years- old she is admitted again with the diagnosis of erythema nodosum and the clinical suspicion of Sweet’s syndrome, having a good evolution. The relation between atopy and autoimmunity is enfatized by the authors. This simultaneous occurrence does not correspond merely to a statistical association, but may represent a global immune system impairment, with the involvement of different types of hypersensibility.

Scientific Electronic Library Online (Portuguese)