Peripheral blood mononuclear cell activation induced by Leptospira interrogans glycolipoprotein

Peripheral blood mononuclear cell activation induced by Leptospira interrogans glycolipoprotein

Autor Diament, Decio Autor UNIFESP Google Scholar
Brunialti, Milena Karina Colo Autor UNIFESP Google Scholar
Romero, Eliete Calo Google Scholar
Kallas, Esper Georges Autor UNIFESP Google Scholar
Salomao, Reinaldo Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Inst Infectol Emilio Ribas
Inst Adolpho Lutz
Resumo Leptospira interrogans glycolipoprotein (GLP) has been implicated in pathological and functional derangement seen in leptospirosis. the goal of this study was to evaluate GLP's ability to induce cellular activation, as assessed by cytokine production and expression of surface activation markers. GLP extracted from either pathogenic L. interrogans serovar Copenhageni or nonpathogenic Leptospira biflexa serovar Patoc (GLPp) was used to stimulate peripheral blood mononuclear cell cultures from healthy donors. Supernatant cytokine levels were measured by enzyme-linked immunosorbent assay. Expression of CD69 and HLA-DR on lymphocytes and monocytes, as well as lipopolysaccharide (LPS) binding, were measured by flow cytometry. At 6 h of incubation, GLP induced a significant rise in tumor necrosis factor alpha levels, which dropped progressively until 72 h of incubation. Interleukin-10 peak levels were obtained at between 24 and 48 h, with sustained levels until 72 h of incubation. the response magnitude was proportional to the GLP dose. CD69 expression on T lymphocytes and monocytes increased significantly, as did HLA-DR expression on monocytes. GLPp induced no CD69 or HLA-DR expression. GLP did not block biotinylated LPS binding to monocytes, suggesting that different pathways are used to induce cell activation. in conclusion, GLP induces cellular activation and may play a major role in the pathogenesis of leptospirosis.
Idioma Inglês
Data 2002-04-01
Publicado em Infection and Immunity. Washington: Amer Soc Microbiology, v. 70, n. 4, p. 1677-1683, 2002.
ISSN 0019-9567 (Sherpa/Romeo, fator de impacto)
Editor Amer Soc Microbiology
Extensão 1677-1683
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000174573200002

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