1887

Abstract

Expression of the human immunodeficiency virus type 1 (HIV-1) provirus in T lymphocytic and monocytic cells can be induced by treatment with hexamethylene bisacetamide (HMBA). The induction occurs at the transcriptional level within 1 to 3 h after the addition of the drug, and is not associated with detectable changes in the binding of transcription factors to the enhancer, TATA box or other regulatory regions of the HIV-1 long terminal repeat (LTR). Using the 5′ deletion mutants of HIV-1 LTR controlling the expression of the chloramphenicol acetyltransferase gene, we found that the deletion of the B enhancer did not affect HIV-1 inducibility, whereas the deletion of the Sp1 binding sites abolished transcriptional activation. However, the presence of the HIV-1 LTR Sp1 binding sites in the context of the heterologous promoter did not induce responsiveness to HMBA. We conclude that HMBA increases transcription through the secondary modification of the basal transcription complex suggesting the existence of a regulatory pathway that circumvents the requirement for the induction of NF-B or other DNA-specific binding proteins.

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1993-11-01
2022-01-25
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