Activation of human immunodeficiency virus 1 gene expression by the src oncoprotein.
Several genes are induced constitutively in cells transformed by the v-src oncoprotein. This induction is generally dependent on the activation of transcription factors binding to src-responsive elements of the promoter. In previous studies, we showed that the induction of the CEF-4/9E3 cytokine gene by pp60v-src is dependent on the PRDII/kappa B domain of the promoter (Dehbi et al., 1992). In this investigation, we describe the activation of the HIV-1 LTR by pp60v-src and show that a region of 30 bp containing the two NF-kappa B binding sites is critical for activation of the promoter. The induction was dependent on transformation since non-transforming forms of pp60v-src had little or no effect on the promoter. The expression of proviral DNA and the release of p24 antigen were also increased by v-src indicating that viral replication was stimulated in src-transformed cells. The effect of v-src on HIV-1 gene expression occurred in the presence or in the absence of the tat viral trans-activator, in fibroblasts and in Jurkat T lymphocytes. These results indicate that several promoters controlled by PRDII/kappa B may be activated constitutively in v-src transformed cells and suggest that oncogenic tyrosine kinases may play a role in the induction of viruses with a PRDII/kappa B-controlled promoter.
Dehbi
M
M
Département de Biochimie, Université de Montréal, Québec, Canada.
Beaulieu
S
S
Cohen
E A
EA
Bédard
P A
PA
D000818:Animals; D001483:Base Sequence; D002642:Chick Embryo; D015967:Gene Expression Regulation, Viral; D016325:HIV Long Terminal Repeat; D015497:HIV-1 / Q000235:genetics*; D008969:Molecular Sequence Data; D016328:NF-kappa B / Q000502:physiology; D015688:Oncogene Protein pp60(v-src) / Q000502:physiology*; D011401:Promoter Regions, Genetic; D016385:TATA Box
D016328:NF-kappa B; D015688:Oncogene Protein pp60(v-src)