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B-lymphocyte activation with an extract of Nocardia brasiliensis.
Infect Immun ; 25(2): 627-34, 1979 Aug.
Article em En | MEDLINE | ID: mdl-314931
An extract from the pathogenic actinomycete Nocardia brasiliensis was mitogenic for murine lymphocytes. This deoxyribonucleic acid-synthetic response of whole spleen cells peaked after 48 h in culture at concentrations of Nocardia extract ranging from 10 to 200 micrograms/ml. The extract appeared to be a mitogen for B lymphocytes since cultures of spleen cells from congenitally athymic nude (nu/nu) mice and of antithymocyte serum plus complement-treated spleen cells from conventional (+/+) mice responded as well as untreated spleen cells from normal +/+ mice. Furthermore, thymocytes did not respond mitogenically to the extract. Mitogenic responses were stimulated in spleen cells from H-2(a), H-2(b), H-2(d), and H-2(k) mice, including lipopolysaccharide-nonresponder C3H/HeJ mice. This Nocardia extract also stimulated polyclonal B-cell activation to the hapten trinitrophenyl, serum protein human gamma globulin, and several mammalian erythrocytes in cultures of cells from both euthymic and nude mice. Additionally, the requirement for helper T cells in the primary in vitro immune response to sheep erythrocytes could be circumvented by the addition of this Nocardia extract. These results indicate that an extract from the pathogen N. brasiliensis can nonspecifically activate murine B lymphocytes and raise the possibility that polyclonal activation of B lymphocytes may contribute to the pathogenesis of nocardiosis.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Linfócitos B / Ativação Linfocitária / Formação de Anticorpos / Nocardia Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Infect Immun Ano de publicação: 1979 Tipo de documento: Article País de publicação: Estados Unidos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Linfócitos B / Ativação Linfocitária / Formação de Anticorpos / Nocardia Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Infect Immun Ano de publicação: 1979 Tipo de documento: Article País de publicação: Estados Unidos