title: Platelet-activating factor (PAF) modulates peritoneal mouse macrophage infection by Leishmania amazonensis.
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.
authors.affiliation: Instituto de Microbiologia Prof. Paulo de Góes, Universidade Federal do Rio de Janeiro, Cidade Universitária, IIha do Fundão, 21941-590, Rio de Janeiro, R.J., Brazil.
authors.forename: M S
authors.initials: MS
authors.lastname: Rosa
authors.forename: R B
authors.initials: RB
authors.lastname: Vieira
authors.forename: A F
authors.initials: AF
authors.lastname: Pereira
authors.forename: P M
authors.initials: PM
authors.lastname: Dutra
authors.forename: A H
authors.initials: AH
authors.lastname: Lopes
mesh_terms: D000818:Animals; D001381:Azepines / Q000494:pharmacology; D005260:Female; D007891:Leishmania / Q000187:drug effects* / Q000472:pathogenicity*; D017737:Macrophages, Peritoneal / Q000187:drug effects* / Q000469:parasitology*; D051379:Mice; D008807:Mice, Inbred BALB C; D010972:Platelet Activating Factor / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology; D011493:Protein Kinase C / Q000378:metabolism; D013110:Sphingosine / Q000494:pharmacology; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014230:Triazoles / Q000494:pharmacology
chemical_list: D001381:Azepines; D010972:Platelet Activating Factor; D010975:Platelet Aggregation Inhibitors; D014230:Triazoles; C052518:WEB 2086; D011493:Protein Kinase C; D013110:Sphingosine; D013755:Tetradecanoylphorbol Acetate