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. 1979 Aug;25(2):627–634. doi: 10.1128/iai.25.2.627-634.1979

B-lymphocyte activation with an extract of Nocardia brasiliensis.

L Ortiz-Oritz, D E Parks, J S Lopez, W O Weigle
PMCID: PMC414491  PMID: 314931

Abstract

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.

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Selected References

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