Artículos de revistas
Leucocyte Recruitment Induced By Type Ii Phospholipases A2 Into The Rat Pleural Cavity
Registro en:
Toxicon. , v. 38, n. 12, p. 1773 - 1785, 2000.
410101
10.1016/S0041-0101(00)00107-0
2-s2.0-0034594344
Autor
De Castro R.C.
Landucci E.C.T.
Toyama M.H.
Giglio J.R.
Marangoni S.
De Nucci G.
Antunes E.
Institución
Resumen
Bothropstoxin-I (BthTX-I) and bothropstoxin-II (BthTX-II) are Lys-49 and Asp-49 phospholipases A2 (PLA2s), respectively, isolated from Bothrops jararacussu venom. Piratoxin-I (PrTX-I) is a Lys-49 PLA2 isolated from Bothrops pirajai venom. In this study, the ability of BthTX-I, BthTX-II and PrTX-I to recruit leucocytes into the rat pleural cavity and potential mechanisms underlying this effect were investigated. Intrapleural injection of either BthTX-I or PrTX-I (10-100 μg/cavity each) caused a significant leucocyte infiltration at 12 h after injection. The maximal cell migration was observed with the dose of 30 μg/cavity (14.9±15.5 and 17.6±1.6x106 cells/cavity, respectively). Leucocyte counts consisted mainly of mononuclear cells, but significant amounts of neutrophils and eosinophils were also observed. Intrapleural injection of BthTX-II (10-100 μg/cavity) caused a marked leucocyte infiltration at 6 and 12 h after injection. The maximal response was observed with the dose of 100 μg/cavity (57.3±3.4x106 cells/cavity, 6 h). The leucocyte counts were mainly composed of neutrophils and mononuclear cells. The treatment of either BthTX-I (30 μg/cavity, 12 h) or BthTX-II (30 μg/cavity, 6 h) with the PLA2 inhibitor p-bromophenacyl bromide (p-BPB) had no effect on the total and differential leucocyte counts induced by these proteins. The same treatment partially reduced the PrTX-I-induced pleural leucocyte infiltration. In rats depleted of the histamine and 5-hydroxytryptamine (5-HT) stores by chronic treatment with compound 48/80, the total leucocyte counts in response to BthTX-I, BthTX-II and PrTX-I was not significantly affected compared to control animals. 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