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- W2089260734 abstract "In HIV-infected individuals dysregulation of the immune system is characterized by severe disorders of the cytokine network. Increase secretion of IL-2, the major T cell growth and differentiation cytokine, may play a decisive role in sensitization of T cells for activation induced apoptosis and indirect death of activated T cells through augmented virus replication. We investigated the cause of enhanced IL-2 secretion and found that the HIV Tat induces this effect. We demonstrate that increased IL-2 secretion is due to Tat-enhanced IL-2 promoter activation. Tat derepresses and activates the distal AP-1 site (position -185 to -177) in the IL-2 promoter. In nonstimulated T cells a repressor complex containing NF-IL6, JunB, c-Fos and Fra-1 is formed on the AP-1(IL-2/d) site and represses IL-2 promoter activity. After T cell activation, a heterodimeric activator containing p65 and c-Jun binds to the AP-1(IL-2/d) site. HIV Tat enhances activation of NF-kappaB and consequently, activates the AP-1(IL-2/d) site. Our data provide evidence for a novel mechanism by which HIV Tat dysregulates IL-2 production and therefore may contribute to the HIV-1 infection in a way yet to be clarified." @default.
- W2089260734 created "2016-06-24" @default.
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- W2089260734 date "2001-06-01" @default.
- W2089260734 modified "2023-10-15" @default.
- W2089260734 title "The effect of HIV-1 regulatory proteins on cellular genes: derepression of the IL-2 promoter by Tat" @default.
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- W2089260734 doi "https://doi.org/10.1002/1521-4141(200106)31:6<1790::aid-immu1790>3.0.co;2-g" @default.
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