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PEST domain-enriched tyrosine phosphatase (PEP) regulation of effector/memory T cells.

Authors:
Hasegawa K, Martin F, Huang G, Tumas D, Diehl L, Chan AC
Affiliation:
Journal:
Science (New York, N.Y.)

Abstract

Protein tyrosine kinases and phosphatases cooperate to regulate normal immune cell function. We examined the role of PEST domain-enriched tyrosine phosphatase (PEP) in regulating T cell antigen-receptor function during thymocyte development and peripheral T cell differentiation. Although normal naïve T cell functions were retained in pep-deficient mice, effector/memory T cells demonstrated enhanced activation of Lck. In turn, this resulted in increased expansion and function of the effector/memory T cell pool, which was also associated with spontaneous development of germinal centers and elevated serum antibody levels. These results revealed a central role for PEP in negatively regulating specific aspects of T cell development and function.

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