title: Regulatory effects of nitric oxide on Src kinase, FAK, p130Cas, and receptor protein tyrosine phosphatase alpha (PTP-alpha): a role for the cellular redox environment.
abstract: The role of NO in regulating the focal adhesion proteins, Src, FAK, p130 Cas, and PTP-alpha, was investigated. Fibroblasts expressing PTP-alpha (PTP-alpha(WT) cells), fibroblasts "knockout" for PTP-alpha (PTP-alpha(-/-) cells), and "rescued" "knockout" fibroblasts (PTP-alpha A5/3 cells) were stimulated with either S-nitroso-N-acetylpenicillamine (SNAP) or fetal bovine serum (FBS). FBS increased inducible NO synthase in both cell lines. Activation of Src mediated either by SNAP or by FBS occurred independent of dephosphorylation of Tyr527 in PTP-alpha(-/-) cells. Both stimuli promoted dephosphorylation of Tyr527 and activation of Src kinase in PTP-alpha(WT) cells. NO-mediated activation of Src kinase affected the activities of FAK and p130Cas and was dependent on the expression of PTP-alpha. Analogous to tyrosine phosphorylation, SNAP and FBS stimulated differential generation of NO and S-nitrosylation of Src kinase in both cell lines. Incubation with SNAP resulted in higher levels of NO and S-nitrosylation of immunoprecipitated Src in PTP-alpha(-/-) cells (oxidizing redox environment) as compared with the levels of NO and S-nitrosylated Src in PTP-alpha(WT) cells (reducing redox environment). SNAP differentially stimulated cell proliferation of both cell lines is dependent on the intracellular redox environment, Src activity, and PTP-alpha expression. This dependence also is observed with FBS-stimulated cell migration.
authors.affiliation: Department of Biochemistry/Molecular Biology, CINTERGEN, Universidade Federal de São Paulo , São Paulo, Brazil.
authors.forename: Marli F
authors.initials: MF
authors.lastname: Curcio
authors.forename: Wagner L
authors.initials: WL
authors.lastname: Batista
authors.forename: Edlaine
authors.initials: E
authors.lastname: Linares
authors.forename: Fabio D
authors.initials: FD
authors.lastname: Nascimento
authors.forename: Miriam S
authors.initials: MS
authors.lastname: Moraes
authors.forename: Roberta E
authors.initials: RE
authors.lastname: Borges
authors.forename: Jan
authors.initials: J
authors.lastname: Sap
authors.forename: Arnold
authors.initials: A
authors.lastname: Stern
authors.forename: Hugo P
authors.initials: HP
authors.lastname: Monteiro
mesh_terms: D000818:Animals; D002417:Cattle; D002465:Cell Movement; D049109:Cell Proliferation; D002478:Cells, Cultured; D050719:Crk-Associated Substrate Protein / Q000235:genetics / Q000378:metabolism*; D005347:Fibroblasts / Q000166:cytology / Q000502:physiology; D051416:Focal Adhesion Protein-Tyrosine Kinases / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D009569:Nitric Oxide / Q000235:genetics / Q000378:metabolism*; D020030:Nitric Oxide Donors / Q000378:metabolism; D052247:Nitric Oxide Synthase Type II / Q000235:genetics / Q000378:metabolism; D010084:Oxidation-Reduction; D054630:Receptor-Like Protein Tyrosine Phosphatases, Class 4 / Q000235:genetics / Q000378:metabolism*; D026423:S-Nitroso-N-Acetylpenicillamine / Q000378:metabolism; D019061:src-Family Kinases / Q000235:genetics / Q000378:metabolism*
chemical_list: C493842:Bcar1 protein, mouse; D050719:Crk-Associated Substrate Protein; D020030:Nitric Oxide Donors; D009569:Nitric Oxide; D026423:S-Nitroso-N-Acetylpenicillamine; D052247:Nitric Oxide Synthase Type II; D051416:Focal Adhesion Protein-Tyrosine Kinases; D019061:src-Family Kinases; D054630:Receptor-Like Protein Tyrosine Phosphatases, Class 4