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Transcriptional Regulation of Src Homology 2 Domain-Containing Leukocyte Phosphoprotein of 76 kDa: Dissection of Key Promoter Elements ¹

Xiao-Ping Zhong^*,, Jonathan S. Maltzman^*,, Ehmonie A. Hainey^*, and Gary A. Koretzky^2,*,

^* Signal Transduction Program, The Abramson Family Cancer Research Institute, and Departments of Cancer Biology, Medicine, and Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104

SLP-76 (Src homology 2 domain-containing leukocyte phosphoprotein of 76 kDa) is an adaptor molecule expressed in all hemopoietic cell lineages except mature B cells and is known to play critical roles in the function of T cells, mast cells, and platelets and in vascular differentiation. Although great progress has been achieved in our understanding of SLP-76 function, little is known about the mechanisms regulating its expression. In this study we report the initial characterization of essential elements that control SLP-76 transcription. We identify several DNase I-hypersensitive sites in the SLP-76 locus, with a prominent site located in its promoter region. This site exists in T cells and monocytic cells, but not in B cells or fibroblasts. Using transient transfection assays, we identify a 507-bp fragment containing the 5'-untranslated region of the first exon and the immediate upstream sequence that confers transcriptional activation in T cells and monocytic cells, but not in B cells. Analysis of the 5' ends of SLP-76 transcripts reveals differential regulation of SLP-76 transcription initiation between T cells and monocytic cells. Mutational and gel-shift analyses further indicate a critical role within this region for a binding site for Ets family transcription factors. The present study provides the first data to address the mechanisms controlling SLP-76 transcription by providing evidence for several key cis-regulatory elements in the promoter region.