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Molecular and Cellular Biology, March 2003, p. 1896-1909, Vol. 23, No. 6
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.6.1896-1909.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Interleukin-3 Stimulation of mcl-1 Gene Transcription Involves Activation of the PU.1 Transcription Factor through a p38 Mitogen-Activated Protein Kinase-Dependent Pathway

Ju-Ming Wang, Ming-Zong Lai, and Hsin-Fang Yang-Yen*

Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan, Republic of China

Received 2 August 2002/ Returned for modification 11 September 2002/ Accepted 13 December 2002

We have previously demonstrated that the antiapoptotic gene mcl-1 is activated by interleukin-3 (IL-3) in Ba/F3 pro-B cells through two promoter elements designated the CRE-2 and SIE motifs. While the CRE-2-binding complex contains the CREB protein and is activated by IL-3 through the phosphatidylinositol 3-kinase/Akt-dependent pathway, the identity and cytokine activation pathway of the SIE-binding complex remains unclear. In this report, we demonstrated that PU.1 is one component of the SIE-binding complex. A chromatin immunoprecipitation assay further confirmed that PU.1 binds to the mcl-1 promoter region containing the SIE motif in vivo. While IL-3 stimulation does not significantly alter the SIE-binding activity of PU.1, it markedly increases PU.1's transactivation activity. The latter effect coincides with the increased phosphorylation of PU.1 following IL-3 activation of a p38 mitogen-activated protein kinase (p38MAPK)-dependent pathway. A serine-to-alanine substitution at position 142 significantly weakens PU.1's ability to be phosphorylated by the p38MAPK immunocomplex. Furthermore, this S142A mutant is impaired in the ability to be further stimulated by IL-3 to transactivate the mcl-1 reporter through the SIE motif. Taken together, our results demonstrate that IL-3 stimulation of mcl-1 gene transcription through the SIE motif involves phosphorylation of PU.1 at serine 142 by a p38MAPK-dependent pathway.

* Corresponding author. Mailing address: Institute of Molecular Biology, Academia Sinica, 128 Yen-Jiou Yuan Rd., Section 2, Nankang, Taipei 11529, Taiwan, Republic of China. Phone: 886-2-2789-9228. Fax: 886-2-2782-6085. E-mail: imbyy{at}ccvax.sinica.edu.tw.

Molecular and Cellular Biology, March 2003, p. 1896-1909, Vol. 23, No. 6
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.6.1896-1909.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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