title: Peroxiredoxin-4 interacts with and regulates the thromboxane A(2) receptor.
abstract: We identified peroxiredoxin-4 (Prx-4) as a protein interacting with the beta isoform of the thromboxane A(2) receptor (TPbeta) by yeast two-hybrid analysis. Prx-4 co-immunoprecipitated constitutively with TPbeta in HEK293 cells. The second and third intracellular loops as well as the C-terminus of TPbeta interacted directly with Prx-4. Co-expression of Prx-4 caused a 60% decrease in cell surface expression of TPbeta. Prx-4 and TPbeta predominantly co-localized in the endoplasmic reticulum. Co-expression of Prx-4 in cells treated with H(2)O(2) targeted TPbeta for degradation. We show for the first time an interaction between a receptor involved in oxidative stress and Prx-4, an anti-oxidative enzyme.
authors.affiliation: Service de Rhumatologie, Département de Médecine, Faculté de Médecine and Centre de Recherche Clinique-Etienne Lebel, Québec, Canada.
authors.forename: Patrick
authors.initials: P
authors.lastname: Giguère
authors.forename: Marie-Eve
authors.initials: ME
authors.lastname: Turcotte
authors.forename: Emilie
authors.initials: E
authors.lastname: Hamelin
authors.forename: Audrey
authors.initials: A
authors.lastname: Parent
authors.forename: Jessy
authors.initials: J
authors.lastname: Brisson
authors.forename: Geneviève
authors.initials: G
authors.lastname: Laroche
authors.forename: Pascale
authors.initials: P
authors.lastname: Labrecque
authors.forename: Gilles
authors.initials: G
authors.lastname: Dupuis
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Parent
mesh_terms: D002460:Cell Line; D004721:Endoplasmic Reticulum / Q000378:metabolism; D019084:Fluorescent Antibody Technique, Indirect; D005786:Gene Expression Regulation; D049452:Green Fluorescent Proteins / Q000378:metabolism; D006801:Humans; D006861:Hydrogen Peroxide / Q000494:pharmacology; D007295:Inositol Phosphates / Q000032:analysis / Q000378:metabolism; D016877:Oxidants / Q000494:pharmacology; D018384:Oxidative Stress; D010544:Peroxidases / Q000235:genetics / Q000378:metabolism*; D054464:Peroxiredoxins; D011233:Precipitin Tests; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D021381:Protein Transport; D044244:Receptors, Thromboxane A2, Prostaglandin H2 / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D015398:Signal Transduction; D014162:Transfection; D020798:Two-Hybrid System Techniques
chemical_list: D007295:Inositol Phosphates; D016877:Oxidants; D020033:Protein Isoforms; D044244:Receptors, Thromboxane A2, Prostaglandin H2; D011993:Recombinant Fusion Proteins; D049452:Green Fluorescent Proteins; D006861:Hydrogen Peroxide; D010544:Peroxidases; C515980:PRDX4 protein, human; D054464:Peroxiredoxins