Platelet-Activating Factor (PAF) Modulates Peritoneal Mouse Macrophage Infection by Leishmania amazonensis |
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| Authors: | Maria do Socorro S. Rosa Renata B. Vieira Antônio F. Pereira Patricia M.L. Dutra Angela Hampshire C.S. Lopes |
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| Affiliation: | Instituto de Microbiologia Prof. Paulo de Góes, Universidade Federal do Rio de Janeiro, Cidade Universitária, IIha do Fund?o, 21941-590,, Rio de Janeiro, R.J., Brazil, BR
Departamento de Análises Clinicas e Toxicológicas, Faculdade de Farmácia, UFRJ Rio de Janeiro, R.J., Brazil, BR
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| Abstract: | The effects of platelet-activating factor (PAF) on the infection of peritoneal mouse macrophages by Leishmania amazonensis were investigated. Prior to the infection, the parasites and/or the macrophages were treated with PAF and/or one of the following modulators: WEB 2086 (PAF antagonist), and the modulators of protein kinase C, phorbol-12-myristate-13-acetate (PMA), and sphingosine. The infection was inhibited when the macrophages or both the parasites and the macrophages were treated with PAF, but stimulated by PAF-treated parasites. WEB 2086 abrogated PAF effects in both systems. The infection was stimulated when the macrophages were treated with sphingosine plus PAF, but inhibited when the macrophages were treated with sphingosine and the parasites with sphingosine plus PAF. The infection was inhibited by sphingosine-treated parasites, either in the presence or in the absence of PAF. Leishmania amazonensis–macrophage infection was inhibited by PMA in all systems tested. Received: 27 September 2000 / Accepted: 15 December 2000 |
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