title: 5-Hydroxytryptamine1A receptor/Gibetagamma stimulates mitogen-activated protein kinase via NAD(P)H oxidase and reactive oxygen species upstream of src in chinese hamster ovary fibroblasts.
abstract: The hypothesis of this work is that the 'serotonin' or 5-hydroxytryptamine (5-HT)(1A) receptor, which activates the extracellular signal-regulated kinase (ERK) through a G(i)betagamma-mediated pathway, does so through the intermediate actions of reactive oxygen species (ROS). Five criteria were shown to support a key role for ROS in the activation of ERK by the 5-HT(1A) receptor. (1) Antioxidants inhibit activation of ERK by 5-HT. (2) Application of cysteine-reactive oxidant molecules activates ERK. (3) The 5-HT(1A) receptor alters cellular redox properties, and generates both superoxide and hydrogen peroxide. (4) A specific ROS-producing enzyme [NAD(P)H oxidase] is involved in the activation of ERK. (5) There is specificity both in the effects of various chemical oxidizers, and in the putative location of the ROS in the ERK activation pathway. We propose that NAD(P)H oxidase is located in the ERK activation pathway stimulated by the transfected 5-HT(1A) receptor in Chinese hamster ovary (CHO) cells downstream of G(i)betagamma subunits and upstream of or at the level of the non-receptor tyrosine kinase, Src. Moreover, these experiments provide confirmation that the transfected human 5-HT(1A) receptor induces the production of ROS (superoxide and hydrogen peroxide) in CHO cells, and support the possibility that an NAD(P)H oxidase-like enzyme might be involved in the 5-HT-mediated generation of both superoxide and hydrogen peroxide.
authors.affiliation: Department of Medicine, Medical University of South Carolina, 96 Jonathan Lucas Street, Charleston, SC 29425, USA.
authors.forename: Y V
authors.initials: YV
authors.lastname: Mukhin
authors.forename: M N
authors.initials: MN
authors.lastname: Garnovskaya
authors.forename: G
authors.initials: G
authors.lastname: Collinsworth
authors.forename: J S
authors.initials: JS
authors.lastname: Grewal
authors.forename: D
authors.initials: D
authors.lastname: Pendergrass
authors.forename: T
authors.initials: T
authors.lastname: Nagai
authors.forename: S
authors.initials: S
authors.lastname: Pinckney
authors.forename: E L
authors.initials: EL
authors.lastname: Greene
authors.forename: J R
authors.initials: JR
authors.lastname: Raymond
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology; D000818:Animals; D016466:CHO Cells; D006224:Cricetinae; D005347:Fibroblasts / Q000378:metabolism; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000378:metabolism*; D006801:Humans; D006861:Hydrogen Peroxide / Q000378:metabolism / Q000494:pharmacology; D007700:Kinetics; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D009247:NADH, NADPH Oxidoreductases / Q000378:metabolism*; D019255:NADPH Oxidases; D010084:Oxidation-Reduction; D010766:Phosphorylation; D017382:Reactive Oxygen Species / Q000502:physiology*; D011985:Receptors, Serotonin / Q000235:genetics / Q000502:physiology*; D044263:Receptors, Serotonin, 5-HT1; D011994:Recombinant Proteins / Q000378:metabolism; D012701:Serotonin / Q000494:pharmacology; D013481:Superoxides / Q000378:metabolism; D014162:Transfection; D010566:Virulence Factors, Bordetella / Q000494:pharmacology; D018909:src Homology Domains
chemical_list: D017382:Reactive Oxygen Species; D011985:Receptors, Serotonin; D044263:Receptors, Serotonin, 5-HT1; D011994:Recombinant Proteins; D010566:Virulence Factors, Bordetella; D013481:Superoxides; D012701:Serotonin; D006861:Hydrogen Peroxide; D009247:NADH, NADPH Oxidoreductases; D019255:NADPH Oxidases; D020928:Mitogen-Activated Protein Kinases; D019206:GTP-Binding Protein alpha Subunits, Gi-Go; D000111:Acetylcysteine