Nucleic Acids Research, 1988, Vol. 16, No. 14 6547-6566
© 1988
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Activation of T cell-derived lymphokine genes in T cells and fibroblasts: effects of human T cell leukemia virus type I p40x protein and bovine papilloma virus encoded E2 protein
Department of Molecular Biology, DNAX Research Institute of Molecular and Cellular Biology 901 California Avenue, Palo Alto, CA 94304-1104, USA 1Department of Viral Oncology, Cancer Institute Kami-Ikebukuro, Toshima-ku, Tokyo 170, Japan 2UNICET, Centre de Recherche 27 Chemin des Peupliers, BP11, 69572 Dardilly, France
Received March 9, 1988. The effects of p40x, a product of an human T cell leukemia virus type I, on the activation of lymphokine genes were examined. The mouse GM-CSF and IL-3 genes were activated by cotransfection with a pX containing plasmid both in Jurkat and CV1 cells. Mouse GM-CSF gene was also activated by phytohaemagglutinin A (PHA)/phorbol myristate acetate (PMA) or PMA/calcium ionophore A23187 [GenBank] stimulation. The 5'-flanking region of the mouse GM-CSF gene which is required for activation by pX or mitogen was mapped within 226 bp upstream from the transcription initiation site. Action of pX was not restricted to T cells. pX activated exogenously added GM-CSF, IL-2, IL-3 and IL-4 genes in fibroblasts. Activation of the GM-CSF gene in fibroblasts appears to require the same regulatory region as in T cells. Similar results were obtained using bovine papilloma virus encoded E2 protein. We propose that pX or E2 protein, both in T cells and fibroblasts, activates cellular component(s) in the signal transduction pathway which results in the activation of lymphokine genes in the absence of extracellular stimuli.
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