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J Biol Chem, Vol. 275, Issue 10, 7343-7350, March 10, 2000

Regulation of c-myc Transcription by Interleukin-2 (IL-2)
IDENTIFICATION OF A NOVEL IL-2 RESPONSE ELEMENT INTERACTING WITH STAT-4^*

Irina Grigorieva, Vitalii G. Grigoriev, Michelle K. Rowney, and Richard G. Hoover

From the Department of Pathology, St. Louis University, St. Louis, Missouri 63104

Regulation of c-myc expression is known to occur at the level of transcription initiation. However, the participating promoter elements and their cognate binding proteins have not been fully characterized. c-myc transcription can be stimulated by a number of cytokines including interleukin-2 (IL-2). We have identified a novel IL-2-responsive element, located in the 5'-flanking region of the c-myc gene, between nucleotides 1406 and 1387 (relative to the P2 promoter). This element belongs to the family of interferon- activation site-like responsive elements and has the core sequence TTCCAATAA. We confirmed that IL-2-mediated signaling involves activation by phosphorylation of Jak2 tyrosine kinase and subsequently STAT4. The transcription factor STAT4 binds the TTCCAATAA motif within this responsive element and, therefore, is probably involved in enhancing c-myc transcription upon IL-2 stimulation. Our results propose participation of Jak2 and STAT4 in IL-2-induced up-regulation of c-myc.

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