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. 1994 Jun 7;91(12):5632–5636. doi: 10.1073/pnas.91.12.5632

A synthetic retinoid antagonist inhibits the human immunodeficiency virus type 1 promoter.

M O Lee 1, P D Hobbs 1, X K Zhang 1, M I Dawson 1, M Pfahl 1
PMCID: PMC44050  PMID: 8202539

Abstract

Retinoids regulate a broad range of biological processes and affect cell growth and differentiation of many cell types, including the immune system. Recently, it was reported that human immunodeficiency virus type 1 (HIV-1) expression in macrophages is enhanced by retinoic acid (RA). Retinoid signals are mediated by the RA receptors (RARs) and retinoid X receptors (RXRs) that bind to specific RA responsive elements (RAREs) in the promoter region of susceptible genes. Here, we report on a RARE in the long terminal repeat (LTR) region that allows activation of the HIV-1 LTR. The RARE is composed of two consensus RARE half-sites (A/GGGTCA) arranged as a palindrome separated by 9 nucleotides and is activated by both RAR/RXR heterodimers and RXR homodimers. We show that the COUP (chicken ovalbumin upstream promoter) orphan receptors also bind to the HIV-1 RARE and repress the retinoid response of the HIV-1 RARE or the HIV-1 LTR. Furthermore, a newly discovered synthetic retinoid is shown to be a potent inhibitor of retinoid-induced activation of the HIV-1 RARE. These observations suggest additional approaches for the inhibition of HIV replication.

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Selected References

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