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J. Biol. Chem., Vol. 283, Issue 12, 7921-7935, March 21, 2008

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The Interferon Consensus Sequence-binding Protein (ICSBP/IRF8) Represses PTPN13 Gene Transcription in Differentiating Myeloid Cells^*

Weiqi Huang, Chunliu Zhu, Hao Wang, Elizabeth Horvath, and Elizabeth A. Eklund¹

From the The Feinberg School of Medicine and The Robert H. Lurie Comprehensive Cancer Center, Northwestern University, Chicago, Illinois 60611 and Jesse Brown Veterans Health Administration Medical Center, Chicago, Illinois 60612

The interferon consensus sequence-binding protein (ICSBP/IRF8) is an interferon regulatory factor that is expressed in myeloid and B-cells. ICSBP-deficient mice develop a myeloproliferative disorder characterized by cytokine hypersensitivity and apoptosis resistance. To identify ICSBP target genes involved in these effects, we screened a CpG island microarray with chromatin that co-immunoprecipitated with ICSBP from myeloid cells. Using this technique, we identified PTPN13 as an ICSBP target gene. PTPN13 encodes Fas-associated phosphatase 1 (Fap-1), a ubiquitously expressed protein-tyrosine phosphatase. This was of interest because interaction of Fap-1 with Fas results in Fas dephosphorylation and inhibition of Fas-induced apoptosis. In this study, we found that ICSBP influenced Fas-induced apoptosis in a Fap-1-dependent manner. We also found that ICSBP interacted with a cis element in the proximal PTPN13 promoter and repressed transcription. This interaction increased during myeloid differentiation and was regulated by phosphorylation of conserved tyrosine residues in the interferon regulatory factor domain of ICSBP. ICSBP deficiency was present in human myeloid malignancies, including chronic myeloid leukemia. Therefore, these studies identified a mechanism for increased survival of mature myeloid cells in the ICSBP-deficient murine model and in human myeloid malignancies with decreased ICSBP expression.

Received for publication, August 13, 2007 , and in revised form, January 11, 2008.

^* The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

¹ To whom correspondence should be addressed: Dept. of Medicine, The Feinberg School at Northwestern University, 710 N. Fairbanks Ct., Olson 8524, Chicago, IL 60611. Tel.: 312-503-4625; E-mail: e-eklund{at}northwestern.edu.

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