Linked Life Data

10417174

Source:http://linkedlifedata.com/resource/pubmed/id/10417174

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pubmed-article:10417174pubmed:abstractTextIntracellular protozoan parasites of the genus Leishmania antagonize host defense mechanisms by interfering with cell signaling in macrophages. In this report, the impact of Leishmania donovani on mitogen-activated protein (MAP) kinases and nitric oxide synthase (NOS) expression in the macrophage cell line RAW 264 was investigated. Overnight infection of cells with leishmania led to a significant decrease in phorbol-12-myristate-13-acetate (PMA)-stimulated MAP kinase activity and inhibited PMA-induced phosphorylation of the MAP kinase substrate and transcription factor Elk-1. Simultaneously, leishmania infection markedly attenuated the induction of c-FOS and inducible nitric oxide synthase (iNOS) expression in response to PMA and gamma interferon (IFN-gamma), respectively. These effects correlated with decreased phosphorylation of p44 and p42 MAP kinases on tyrosine residues. Consistent with the latter finding, lysates prepared from leishmania-infected cells contained an activity that dephosphorylated MAP kinase in vitro, suggesting the possibility of a phosphatase acting in vivo. Attenuation of both MAP kinase activity and c-FOS and iNOS expression was reversed by treatment of macrophages with sodium orthovanadate prior to infection. It was also found that the specific activity of the Src homology 2 domain containing tyrosine phosphatase (SHP-1) toward MAP kinase was markedly increased in leishmania-infected cells. These findings indicate that infection with L. donovani attenuates MAP kinase signaling and c-FOS and iNOS expression in macrophages by activating cellular phosphotyrosine phosphatases. This may represent a novel mechanism of macrophage deactivation during intracellular infection.lld:pubmed
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pubmed-article:10417174pubmed:authorpubmed-author:ReinerN ENElld:pubmed
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