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- W1589424342 abstract "Abstract Among the different factors which can contribute to CNS alterations associated with HIV infection, Tat protein is considered to play a critical role. Evidence indicates that Tat can contribute to brain vascular pathology through induction of endothelial cell activation. In the present study, we hypothesized that Tat can affect expression of P‐glycoprotein (P‐gp) in brain microvascular endothelial cells (BMEC). P‐gp is an ATP‐dependent cellular efflux transporter which is involved in the removal of specific non‐polar molecules, including drugs used for highly active antiretroviral therapy (HAART). Treatment of BMEC with Tat 1−72 resulted in P‐gp overexpression both at mRNA and protein levels. These alterations were confirmed in vivo in brain vessels of mice injected with Tat 1−72 into the hippocampus. Furthermore, pre‐treatment of BMEC with SN50, a specific NF‐κB inhibitor, protected against Tat 1−72 ‐stimulated expression of mdr1a gene, i.e. the gene which encodes for P‐gp in rodents. Tat 1−72 ‐mediated changes in P‐gp expression were correlated with increased rhodamine 123 efflux, indicating the up‐regulation of transporter functions of P‐gp. These results suggest that Tat‐induced overexpression of P‐gp in brain microvessels may have significant implications for the development of resistance to HAART and may be a contributing factor for low efficacy of HAART in the CNS." @default.
- W1589424342 created "2016-06-24" @default.
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- W1589424342 date "2005-04-26" @default.
- W1589424342 modified "2023-10-18" @default.
- W1589424342 title "HIV‐Tat protein induces P‐glycoprotein expression in brain microvascular endothelial cells" @default.
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- W1589424342 doi "https://doi.org/10.1111/j.1471-4159.2005.03114.x" @default.
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