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. 1993 Jun;13(6):3350–3358. doi: 10.1128/mcb.13.6.3350

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

T Yi 1, J N Ihle 1
PMCID: PMC359793  PMID: 7684496

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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