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J Biol Chem. 2002 Oct 25;277(43):40375-83. Epub 2002 Aug 12.

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.

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  • 1INSERM U388, Institut Louis Bugnard, Institute Fédératif de Recherche 31, Centre Hospitalier Universitaire Rangueil, 1 Avenue J. Poulhes, 31403 Toulouse Cedex, France.

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.

PMID:
12177051
[PubMed - indexed for MEDLINE]
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