MODULATION of LEISHMANIA (L) AMAZONENSIS GROWTH in CULTURED MOUSE MACROPHAGES BY PROSTAGLANDINS and PLATELET-ACTIVATING-FACTOR

MODULATION of LEISHMANIA (L) AMAZONENSIS GROWTH in CULTURED MOUSE MACROPHAGES BY PROSTAGLANDINS and PLATELET-ACTIVATING-FACTOR

Autor Lonardoni, MVC Google Scholar
Barbieri, C. L. Google Scholar
Russo, Marisa Autor UNIFESP Google Scholar
Jancar, S. Google Scholar
Instituição Universidade de São Paulo (USP)
Universidade Estadual de Maringá (UEM)
Universidade Federal de São Paulo (UNIFESP)
Resumo The role of endogenously synthesized PAF and prostaglandins on the infection of mouse macrophages by Leishmania (L.) amazonensis was investigated, as well as the possible correlation between the effects of these inflammatory mediators with nitric oxide production. It was found that pretreatment of macrophages with 10(-5) M of the PAF antagonists, BN-52021 or WEB-2086, increased macrophage infection by 17 and 59%, respectively. the cyclooxygenase inhibitor, Indomethacin (10 mu g/ml), induced a significant inhibition which was reversed by addition of PGE, (10(-5) M) to the culture medium. These results suggested that the infection of macrophages by Leishmania Is Inhibited by PAF and enhanced by prostaglandins and that these mediators are produced by macrophages during this infection. This was confirmed by addition of these mediators to the culture medium before infection; PAF (10(-6), 10(-9) and 10(-12) M) reduced significantly the infection whereas PGE, (10(-5) M) induced a marked enhancement. This effect of exogenous PAF on macrophage Infection was reversed by the two PAF antagonists used in this study as well as by the inhibitor of nitric oxide synthesis, L-arginine methyl ester (100 mM). Taken together the data suggest that endogenous production of PAF and PGE, exert opposing effects on Leishmania-macrophage interaction and that nitric oxide may be involved in the augmented destruction of parasites induced by PAF.
Palavra-chave LEISHMANIASIS
LEISHMANIA (L) AMAZONENSIS
MACROPHAGE INFECTION
PAF
PROSTAGLANDINS
Idioma Inglês
Data de publicação 1994-04-01
Publicado em Mediators of Inflammation. London: Rapid Science Publishers, v. 3, n. 2, p. 137-141, 1994.
ISSN 0962-9351 (Sherpa/Romeo, fator de impacto)
Publicador Rapid Science Publishers
Extensão 137-141
Fonte http://dx.doi.org/10.1155/S0962935194000177
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:A1994NJ21900006
Endereço permanente http://repositorio.unifesp.br/handle/11600/25390

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