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. 1993 Jul;67(7):4205–4213. doi: 10.1128/jvi.67.7.4205-4213.1993

Differential expression of Rel family members in human T-cell leukemia virus type I-infected cells: transcriptional activation of c-rel by Tax protein.

C C Li 1, F W Ruscetti 1, N R Rice 1, E Chen 1, N S Yang 1, J Mikovits 1, D L Longo 1
PMCID: PMC237790  PMID: 8510222

Abstract

The Tax protein of the human T-cell leukemia virus type I (HTLV-I) has been shown to induce nuclear expression of Rel family NF-kappa B-binding proteins. However, under different experimental conditions, different J. H. Kim, Y. Daitoku, and W. G. Greene, J. Virol. 65:6892-6899, 1991). In this study, using specific immunological reagents capable of distinguishing individual members of the Rel family proteins, we show that only c-Rel, not NF-kappa B p50 or p65, is induced in HTLV-I-infected cells. Preferential c-rel induction by HTLV-I infection was detected at the protein and RNA levels as well as in the nuclear NF-kappa B-binding form. Induced c-rel expression was also detected in cells stably transfected with tax cDNA, further correlating the c-rel induction with viral Tax expression. An increase in c-rel mRNA was detected within 3 h after induction of Tax expression, suggesting that this effect is at least partially regulated at the level of transcription. Furthermore, using a particle bombardment method for gene cotransfection, we show that Tax can transcriptionally activate the c-rel promoter in a T-cell line, Jurkat.

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