title: Selective regulation of tumor necrosis factor-induced Erk signaling by Src family kinases and the T cell protein tyrosine phosphatase.
abstract: The proinflammatory cytokine tumor necrosis factor (TNF) modulates cellular responses through the mitogen-activated protein kinase (MAPK) and nuclear factor-kappaB (NF-kappaB) signaling pathways, but the molecular mechanisms underlying MAPK activation are unknown. T cell protein tyrosine phosphatase (TCPTP) is essential for hematopoietic development and negatively regulates inflammatory responses. Using TCPTP-deficient fibroblasts, we show here that TCPTP regulates TNF-induced MAPK but not NF-kappaB signaling. TCPTP interacted with the adaptor protein TRAF2, and dephosphorylated and inactivated Src tyrosine kinases to suppress downstream signaling through extracellular signal-regulated kinases and production of interleukin 6. These results link TCPTP and Src tyrosine kinases to the selective regulation of TNF-induced MAPK signaling and identify a previously unknown mechanism for modulating inflammatory responses mediated by TNF.
authors.affiliation: Department of Biochemistry and Molecular Biology, Monash University, Victoria 3800, Australia.
authors.forename: Catherine
authors.initials: C
authors.lastname: van Vliet
authors.forename: Patricia E
authors.initials: PE
authors.lastname: Bukczynska
authors.forename: Michelle A
authors.initials: MA
authors.lastname: Puryer
authors.forename: Christine M
authors.initials: CM
authors.lastname: Sadek
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Shields
authors.forename: Michel L
authors.initials: ML
authors.lastname: Tremblay
authors.forename: Tony
authors.initials: T
authors.lastname: Tiganis
mesh_terms: D000818:Animals; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism; D006801:Humans; D015850:Interleukin-6 / Q000378:metabolism; D020930:MAP Kinase Kinase Kinases / Q000378:metabolism; D020935:MAP Kinase Signaling System; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D054578:Protein Tyrosine Phosphatase, Non-Receptor Type 2; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism*; D013601:T-Lymphocytes / Q000201:enzymology* / Q000276:immunology*; D047992:TNF Receptor-Associated Factor 2 / Q000378:metabolism; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*; D015854:Up-Regulation; D019061:src-Family Kinases / Q000378:metabolism*
chemical_list: D015850:Interleukin-6; D047992:TNF Receptor-Associated Factor 2; D014409:Tumor Necrosis Factor-alpha; D019061:src-Family Kinases; D048049:Extracellular Signal-Regulated MAP Kinases; D048052:Mitogen-Activated Protein Kinase 3; D020930:MAP Kinase Kinase Kinases; C516649:PTPN2 protein, human; D054578:Protein Tyrosine Phosphatase, Non-Receptor Type 2; D017027:Protein Tyrosine Phosphatases