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IL-16 represses HIV-1 promoter activity

Maciaszek, Joseph Walter
Parada, Nereida A.
Cruikshank, William W.
Center, David M.
Kornfeld, Hardy
Viglianti, Gregory A.
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Joseph Walter Maciaszek
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Immunology and Virology
Document Type
Journal Article
Publication Date
1997-01-01
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Abstract

IL-16 is produced by CD8+ lymphocytes and has been reported to inhibit HIV-1 and SIV replication in infected PBMCs. CD4 serves as a receptor for the secreted form of IL-16, and IL-16 binding to CD4 induces signal transduction, which affects the activation state of the cell. We hypothesized, therefore, that the effect of IL-16 on HIV-1 replication might occur at the level of virus expression. In transient transfection studies with HIV-1 LTR-reporter gene constructs we found that pretreatment of CD4+ lymphoid cells with recombinant IL-16 repressed HIV-1 promoter activity up to 60-fold, preventing both PMA and Tat activation. This effect of IL-16 required sequences contained within the core enhancer, but was not simply due to the down-regulation of transcription factors binding to this element.

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J Immunol. 1997 Jan 1;158(1):5-8.

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8977168
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