Abstract
Antiparasitic effect of a lectin isolated from Synadenium carinatum latex (ScLL) was evaluated against Leishmania (Leishmania) amazonensis promastigotes/amastigotes. Pretreatment of murine inflammatory peritoneal macrophages with ScLL reduced by 65.5% the association index of macrophages and L. (L) amazonensis promastigotes. Expression of cytokines (IL-12, IL-1 and TNF-α) was detected in infected macrophages pretreated with ScLL (10μg/mL). ScLL also reduced the growth of L. (L) amazonensis amastigote intracellular forms, showing no in vitro cytotoxic effects in mammalian host cells. ScLL treatment in infected murine inflammatory peritoneal macrophages did not induce nitric oxide production, suggesting that a nitric oxide independent pathway is activated to decrease the number of intracellular Leishmania.
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