Avaliação da capacidade fagocitária, produção de peróxido de hidrogênio e fator de necrose tumoral por monócitos de pacientes com leishmaniose tegumentar americana

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Leishmaniasis threatens 350 million people in 88 countries and remains a serious public health problem in several parts of the world with more than 12 million infected individuals by some species of the parasite, and about 1,5 million clinical cases by year. Macrophages are important in defense against parasite through phagocytosis and microbicidal mechanisms. This work aimed to evaluate the phagocytosis, hydrogen peroxide and TNF- production by monocytes from leishmaniasis individuals. Phagocytosis was assessed in 18 infected individuals and 15 normal control using Saccharomyces cerevisiae, through pattern recognition receptors and opsonin receptors. The hydrogen peroxide production was assessed by the phenol red oxidation technique. Tumor necrosis factor-a was assessed in the supernatant of monocyte cultures by an immunoassay test. Phagocytosis was decreased in leishmaniasis individuals, through pattern recognition receptors and opsonin receptors. However, hydrogen peroxide and TNF-a production were increased in leishmaniasis individuals. Our data showed for the first time that phagocytic index of monocytes were decreased in leishmaniasis individuals. However, TNF-a production and the microbicidal hydrogen peroxide were increased in these individuals. These data suggest these alterations in monocytes might play a role both in defense against parasites as in pathogenesis of the disease.

ASSUNTO(S)

macrófagos medicina imunopatologia leishmaniose

ACESSO AO ARTIGO

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