title: PEST domain-enriched tyrosine phosphatase (PEP) regulation of effector/memory T cells.
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.
authors.affiliation: Department of Immunology, Genentech, Inc., One DNA Way, South San Francisco, CA 94080, USA.
authors.forename: Kiminori
authors.initials: K
authors.lastname: Hasegawa
authors.forename: Flavius
authors.initials: F
authors.lastname: Martin
authors.forename: Guangming
authors.initials: G
authors.lastname: Huang
authors.forename: Dan
authors.initials: D
authors.lastname: Tumas
authors.forename: Lauri
authors.initials: L
authors.lastname: Diehl
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Chan
mesh_terms: D000818:Animals; D015551:Autoimmunity; D001402:B-Lymphocytes / Q000502:physiology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000502:physiology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology / Q000502:physiology; D002453:Cell Cycle; D018390:Gene Targeting; D018858:Germinal Center / Q000502:physiology; D006863:Hydrogen-Ion Concentration; D007136:Immunoglobulins / Q000097:blood; D007156:Immunologic Memory; D008213:Lymphocyte Activation; D018655:Lymphocyte Count; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck) / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008822:Mice, Transgenic; D010766:Phosphorylation; D054594:Protein Tyrosine Phosphatase, Non-Receptor Type 12; D017027:Protein Tyrosine Phosphatases / Q000235:genetics / Q000378:metabolism*; D011948:Receptors, Antigen, T-Cell / Q000235:genetics / Q000276:immunology; D015398:Signal Transduction; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology* / Q000502:physiology
chemical_list: D007136:Immunoglobulins; D011948:Receptors, Antigen, T-Cell; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck); D054594:Protein Tyrosine Phosphatase, Non-Receptor Type 12; D017027:Protein Tyrosine Phosphatases; C516739:Ptpn12 protein, mouse