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Mol Cell Biol. 1993 June; 13(6): 3350-3358

Association of hematopoietic cell phosphatase with c-Kit after stimulation with c-Kit ligand.

Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee 38105.

ABSTRACT

Protein tyrosine phosphorylation and dephosphorylation have been implicated in the growth and functional responses of hematopoietic cells. Recent studies have identified a novel protein tyrosine phosphatase, termed hematopoietic cell phosphatase (HCP) or PTP1C, that is predominantly expressed in hematopoietic cells. HCP encodes a cytoplasmic phosphatase that contains two src homology 2 (SH2) domains. Since SH2 domains have been shown to target the association of signal-transducing molecules with activated growth factor receptors containing intrinsic protein kinase activity, we assessed the association of HCP with two hematopoietic growth factor receptors, c-Kit and c-Fms. The results demonstrate that HCP transiently associates with ligand-activated c-Kit but not c-Fms and that this association occurs through the SH2 domains. In both colony-stimulating factor 1- and stem cell factor-stimulated cells, there is a marginal increase in tyrosine phosphorylation of HCP. Lastly, HCP can dephosphorylate autophosphorylated c-Kit and c-Fms in in vitro reactions. The potential role of HCP in stem cell factor signal transduction is discussed.

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