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pubmed-article:11022134pubmed:abstractTextChemokine receptors are not only able to bind chemokines but, together with CD4, they serve as an entry door for the human immunodeficiency virus type 1 (HIV-1). The signalling capacity of chemokine receptors, which is of fundamental importance for chemokine-induced chemotaxis, is not used by HIV-1 to enter a target cell, nor by chemokines or chemokine-derived ligands to inhibit viral entry. In addition, an ill-defined signal triggered by chemokines can, under some circumstances, lead to an increase in HIV-1 expression. We show here that, in infected cells, exposure to SDF-1 leads to an increased expression of a X4 strain of HIV-1. A similar increase can be induced by an N-terminal peptide of SDF-1 which had previously been shown to elicit an intracellular calcium response and to inhibit the entry of X4 strains of HIV-1. We demonstrate the involvement of extracellular signal-regulated kinases (ERK) in this phenomenon. SDF-1 activates ERK-1 and ERK-2 in Jurkat cells. In HeLa cells, ERK-2 only is activated by SDF-1 or by a SDF-derived peptide. This ERK activation can be blocked by pertussis toxin and by the MEK inhibitor U0126. Most importantly, SDF-1-dependent HIV-1 expression is abolished by pretreating the cells with pertussis toxin or with U0126. The consequences of this SDF-1-induced, ERK-dependent modulation of HIV-1 expression in infected cells may have a clinical relevance for eradicating latent viruses.lld:pubmed
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pubmed-article:11022134pubmed:articleTitleSDF-1-induced activation of ERK enhances HIV-1 expression.lld:pubmed
pubmed-article:11022134pubmed:affiliationCNRS UMR 7627, CERVI, CHU Pitié-Salpêtrière, 75013 Paris, France.lld:pubmed
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