ETS1, NFkappaB and AP1 synergistically transactivate the human GM-CSF promoter

Oncogene
R S ThomasI Kola

Abstract

Activation of helper T cells results in coordinate expression of a number of cytokines involved in differentiation, proliferation and activation of the haematopoietic system. Granulocyte-macrophage colony stimulating factor (GM-CSF) is one such cytokine, whose increased expression results mostly from increases in transcription. Cis-acting elements with NFkappaB, AP1 and ETS-like binding motifs have been identified in the promoter region of the GM-CSF gene, and are important or essential for transcriptional activity following T cell activation. ETS1 is a transcription factor of the ETS family that is expressed in T cells. We have previously shown that ETS1 can transactivate GM-CSF in Jurkat T cells, but only after the cells have been stimulated by treatment with PMA and ionomycin, agents that mimic T cell activation. Thus we proposed that ETS1, which is expressed constitutively in Jurkat cells, may act in concert with PMA/ionomycin inducible factors. Here we show that ETS1 can transactivate a GM-CSF reporter construct in unstimulated Jurkat cells, providing that either NFkappaB or AP1 transcription factors are supplied by co-transfection. We confirm that binding of endogenous NFkappaB and AP1 is induced following PMA/ionomycin t...Continue Reading

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