Abstract:
:The trans-activator protein, tax, from the human T leukemia virus type 1 (HTLV-1) trans-activates both viral and cellular genes. It has previously been shown that granulocyte macrophage-colony stimulating factor (GM-CSF) is constitutively expressed in HTLV-1 infected cells and in cells artificially expressing tax. We show here that the GM-CSF promoter is tax responsive in fibroblasts and T cells, whereas the granulocyte (G)-CSF promoter is tax responsive only in fibroblasts. The tax protein can activate cellular genes through a least two families of transcription factors; the NF-kB/rel and CREB/ATF families. We have used mutant tax proteins to show that the activation of NF-kB proteins is essential for tax trans-activation of both the GM-CSF and G-CSF promoters. The ability of tax to activate CREB/ATF proteins is also essential for GM-CSF transactivation. We have identified a 44 bp region of the GM-CSF promoter that contains tax responsive elements. This region contains a classical NF-kB site, a CK-1 element that can bind the NF-kB p65 protein, as well as a putative ATF binding site. The tax response of the G-CSF promoter requires not only the conserved CK-1 sequence but also an adjacent NF-IL6 binding site that may explain the cell restricted function of the G-CSF promoter.
journal_name
Oncogenejournal_title
Oncogeneauthors
Himes SR,Coles LS,Katsikeros R,Lang RK,Shannon MFsubject
Has Abstractpub_date
1993-12-01 00:00:00pages
3189-97issue
12eissn
0950-9232issn
1476-5594journal_volume
8pub_type
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