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. 1997 Mar;71(3):1975–1983. doi: 10.1128/jvi.71.3.1975-1983.1997

Transrepression of lck gene expression by human T-cell leukemia virus type 1-encoded p40tax.

I Lemasson 1, V Robert-Hebmann 1, S Hamaia 1, M Duc Dodon 1, L Gazzolo 1, C Devaux 1
PMCID: PMC191281  PMID: 9032329

Abstract

To understand the mechanism of p56lck protein downregulation observed in human T cells infected by human T-cell leukemia virus type 1 (HTLV-1), we have investigated the ability of the 3' end of the HTLV-1 genome as well as that of the tax and rex genes to modulate p56lck protein expression and p56lck mRNA synthesis. By using Jurkat T cells stably transfected with constructs that expressed either the 3' end of the HTLV-1 genome (JK C11-pMTEX), the tax gene (JK52-Tax) or the rex gene (JK9-Rex), we found that the expression of p40tax (Tax) was sufficient to modulate p56lck protein expression. Similarly, we found that the expression of the mRNA which encoded p56lck was repressed in Jurkat T cells which expressed Tax. This downregulation was shown to be proportional to the amount of tax mRNA found in the transfected cells, as evidenced by experiments that used cells (JPX-9) stably transfected with a tax gene driven by a cadmium-inducible promoter. Furthermore, cadmium induction of Tax in JPX-9 cells transiently transfected with a construct containing the chloramphenicol acetyltransferase (CAT) gene under control of the lck distal promoter (lck DP-CAT) resulted in the downregulation of CAT gene expression. In contrast, cadmium induction of Tax in JPX-9 cells transiently transfected with a CAT construct driven by a lck DP with a deletion extending from position -259 to -253 (a sequence corresponding to a putative E-Box) did not modulate CAT gene expression, suggesting that the effect of Tax on p56lck is mediated through an E-Box binding protein.

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Selected References

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