The role of phosphotyrosine phosphatases in haematopoietic cell signal transduction

BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology
J A Frearson, D R Alexander

Abstract

Phosphotyrosine phosphatases (PTPases) are the enzymes which remove phosphate groups from protein tyrosine residues. An enormous number of phosphatases have been cloned and sequenced during the past decade, many of which are expressed in haematopoietic cells. This review focuses on the biochemistry and cell biology of three phosphatases, the transmembrane CD45 and the cytosolic SH2-domain-containing PTPases SHP-1 and SHP-2, to illustrate the diverse ways in which PTPases regulate receptor signal transduction. The involvement of these and other PTPases has been demonstrated in haematopoietic cell development, apoptosis, activation and nonresponsiveness. A common theme in the actions of many haematopoietic cell PTPases is the way in which they modulate the thresholds for receptor signalling, thereby regulating critical events in the positive and negative selection of lymphocytes. There is growing interest in haematopoietic PTPases and their associated regulatory proteins as targets for pharmaceutical intervention and in the involvement of these enzymes in human disease.

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