Linked Life Data

16920714

Source:http://linkedlifedata.com/resource/pubmed/id/16920714

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pubmed-article:16920714pubmed:abstractTextHuman immunodeficiency virus (HIV)-Tat plays an important role in virus replication and in various aspects of host immune responses, including dysregulation of cytokine production. IL-10, an anti-inflammatory cytokine, is up-regulated during the course of HIV infection representing an important pathway by which HIV may induce immunodeficiency. Here we show that extracellular as well as intracellular Tat induced IL-10 expression in normal human monocytes and promonocytic THP-1 cells. The signaling pathways involved in the regulation of IL-10 production by endogenous Tat remain unknown. To understand the molecular mechanism underlying intracellular Tat-induced IL-10 transcription, we employed a retroviral expression system to investigate the role of MAPKs and the transcription factor(s) involved. Our results suggest that an inhibitor specific for the ERK1/2, PD98059, selectively blocked intracellular Tat-induced IL-10 expression in THP-1 cells. Furthermore, intracellular Tat activated the CREB-1 transcription factor through Ser(133) phosphorylation that was regulated by ERK MAPK as determined by IL-10 promoter analysis and gel shift assays. Overall, our results suggest that intracellular HIV-Tat induces IL-10 transcription by ERK MAPK-dependent CREB-1 transcription factor activation through Ser(133) phosphorylation.lld:pubmed
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pubmed-article:16920714pubmed:articleTitleIntracellular HIV-Tat expression induces IL-10 synthesis by the CREB-1 transcription factor through Ser133 phosphorylation and its regulation by the ERK1/2 MAPK in human monocytic cells.lld:pubmed
pubmed-article:16920714pubmed:affiliationDepartment of Pathology, Division of Virology, Research Institute, Children's Hospital of Eastern Ontario, Ottawa K1H 8L1, Canada.lld:pubmed
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pubmed-article:16920714pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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