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Dual regulation of L-selectin (CD62L) by HIV-1: Enhanced expression by Vpr in contrast with cell-surface down-modulation by Nef and Vpu.

Virology. 2018 Oct;523:121-128. Epub 2018 Aug 14
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摘要


The HIV-1 accessory protein Vpr displays various activities that can favor viral replication such as G2 cell cycle arrest. Vpr also modulates host gene expression, although this property is poorly characterized. Here, we investigated the effect of Vpr on L-selectin (CD62L), which crucially controls leukocytes circulation and generation of immune responses against pathogens. We report that Vpr up-regulates CD62L mRNA level when individually expressed in Jurkat T cells as well as during HIV-1 infection of primary CD4+ T cells. Vpr mutant analysis and use of inhibitors suggest that the effect of Vpr on CD62L occurs independently of G2 arrest but requires activation of the ATR kinase. Yet, induction of CD62L expression by Vpr is contrasted by down-regulation of CD62L protein by Nef that, together with Vpu, induces a net reduction of cell-surface CD62L on HIV-1-infected cells, which may impact viral spread and evasion of immune responses.

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