title: A novel protein-protein interaction between a G protein-coupled receptor and the phosphatase SHP-2 is involved in bradykinin-induced inhibition of cell proliferation.
abstract: Mitogenic G protein-coupled receptor (GPCR) signaling has been extensively studied. In contrast, little is known about anti-mitogenic GPCR signaling. We show here that anti-mitogenic signaling of a GPCR, the bradykinin B2 receptor, involves a novel direct protein-protein interaction. The antiproliferative effect of bradykinin was accompanied by a transient increase in protein-tyrosine phosphatase activity. Using surface plasmon resonance analysis, we observed that an immunoreceptor tyrosine-based inhibitory motif (ITIM) located in the C-terminal part of the B2 receptor interacted specifically with the protein-tyrosine phosphatase SHP-2. The interaction was confirmed in primary culture renal mesangial cells by co-immunoprecipitation of a B2 receptor.SHP-2 complex. The extent of the interaction was transiently increased by stimulation with bradykinin, which was accompanied by an increase in specific SHP-2 phosphatase activity. Mutational analysis of the key ITIM residue confirmed that the B2 receptor ITIM sequence is required for interaction with SHP-2, SHP-2 activation, and the anti-mitogenic effect of bradykinin. Finally, in mesangial cells transfected with a dominant-negative form of SHP-2, bradykinin lost the ability to inhibit cell proliferation. These observations demonstrate that bradykinin inhibits cell proliferation by a novel mechanism involving a direct protein-protein interaction between a GPCR (the B2 receptor) and SHP-2.
authors.affiliation: INSERM U388, Institut Louis Bugnard, Institute Fédératif de Recherche 31, Centre Hospitalier Universitaire Rangueil, 1 Avenue J. Poulhes, 31403 Toulouse Cedex, France.
authors.forename: Johan
authors.initials: J
authors.lastname: Duchene
authors.forename: Joost P
authors.initials: JP
authors.lastname: Schanstra
authors.forename: Christiane
authors.initials: C
authors.lastname: Pecher
authors.forename: Anne
authors.initials: A
authors.lastname: Pizard
authors.forename: Christiane
authors.initials: C
authors.lastname: Susini
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Esteve
authors.forename: Jean-Loup
authors.initials: JL
authors.lastname: Bascands
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Girolami
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001920:Bradykinin / Q000494:pharmacology*; D002455:Cell Division / Q000187:drug effects*; D002478:Cells, Cultured; D017931:DNA Primers; D019204:GTP-Binding Proteins / Q000378:metabolism*; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008969:Molecular Sequence Data; D010766:Phosphorylation; D011233:Precipitin Tests; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D017027:Protein Tyrosine Phosphatases / Q000378:metabolism*; D043782:Receptor, Bradykinin B2; D018002:Receptors, Bradykinin / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D014443:Tyrosine / Q000378:metabolism
chemical_list: D017931:DNA Primers; D047908:Intracellular Signaling Peptides and Proteins; D043782:Receptor, Bradykinin B2; D018002:Receptors, Bradykinin; D014443:Tyrosine; C516724:PTPN11 protein, human; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D017027:Protein Tyrosine Phosphatases; D019204:GTP-Binding Proteins; D001920:Bradykinin