title: The P2Y2 nucleotide receptor interacts with alphav integrins to activate Go and induce cell migration.
abstract: Extracellular ATP and UTP induce chemotaxis, or directed cell migration, by stimulating the G protein-coupled P2Y(2) nucleotide receptor (P2Y(2)R). Previously, we found that an arginine-glycine-aspartic acid (RGD) integrin binding domain in the P2Y(2)R enables this receptor to interact selectively with alpha(v)beta(3) and alpha(V)beta(5) integrins, an interaction that is prevented by mutation of the RGD sequence to arginine-glycine-glutamic acid (RGE) (Erb, L., Liu, J., Ockerhausen, J., Kong, Q., Garrad, R. C., Griffin, K., Neal, C., Krugh, B., Santiago-Perez, L. I., Gonzalez, F. A., Gresham, H. D., Turner, J. T., and Weisman, G. A. (2001) J. Cell Biol. 153, 491-501). This RGD domain also was found to be necessary for coupling the P2Y(2)R to G(o)- but not G(q)-mediated intracellular calcium mobilization, leading us to investigate the role of P2Y(2)R interaction with integrins in nucleotide-induced chemotaxis. Here we show that mutation of the RGD sequence to RGE in the human P2Y(2)R expressed in 1321N1 astrocytoma cells completely prevented UTP-induced chemotaxis as well as activation of G(o), Rac, and Vav2, a guanine nucleotide exchange factor for Rac. UTP also increased expression of vitronectin, an extracellular matrix protein that is a ligand for alpha(v)beta(3)/beta(5) integrins, in cells expressing the wild-type but not the RGE mutant P2Y(2)R. P2Y(2)R-mediated chemotaxis, Rac and Vav2 activation, and vitronectin up-regulation were inhibited by pretreatment of the cells with anti-alpha(v)beta(5) integrin antibodies, alpha(v) integrin antisense oligonucleotides, or the G(i/o) inhibitor, pertussis toxin. Thus, the RGD-dependent interaction between the P2Y(2)R and alpha(v) integrins is necessary for the P2Y(2)R to activate G(o) and to initiate G(o)-mediated signaling events leading to chemotaxis.
authors.affiliation: Department of Biochemistry, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: Sriparna
authors.initials: S
authors.lastname: Bagchi
authors.forename: Zhongji
authors.initials: Z
authors.lastname: Liao
authors.forename: Fernando A
authors.initials: FA
authors.lastname: Gonzalez
authors.forename: Nataliya E
authors.initials: NE
authors.lastname: Chorna
authors.forename: Cheikh I
authors.initials: CI
authors.lastname: Seye
authors.forename: Gary A
authors.initials: GA
authors.lastname: Weisman
authors.forename: Laurie
authors.initials: L
authors.lastname: Erb
mesh_terms: D000077329:Agammaglobulinaemia Tyrosine Kinase; D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D001483:Base Sequence; D002460:Cell Line; D002633:Chemotaxis / Q000502:physiology*; D019206:GTP-Binding Protein alpha Subunits, Gi-Go / Q000378:metabolism*; D006801:Humans; D039564:Integrin alphaV / Q000378:metabolism*; D016297:Mutagenesis, Site-Directed; D017434:Protein Structure, Tertiary; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D051567:Proto-Oncogene Proteins c-vav / Q000378:metabolism; D016372:RNA, Antisense / Q000235:genetics; D018048:Receptors, Purinergic P2 / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D058473:Receptors, Purinergic P2Y2; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D015398:Signal Transduction; D014544:Uridine Triphosphate / Q000378:metabolism; D019096:Vitronectin / Q000378:metabolism; D020744:rac GTP-Binding Proteins / Q000378:metabolism
chemical_list: D039564:Integrin alphaV; C546385:P2RY2 protein, human; D051567:Proto-Oncogene Proteins c-vav; D016372:RNA, Antisense; D018048:Receptors, Purinergic P2; D058473:Receptors, Purinergic P2Y2; D011994:Recombinant Proteins; C093651:VAV2 protein, human; D019096:Vitronectin; D011505:Protein-Tyrosine Kinases; D000077329:Agammaglobulinaemia Tyrosine Kinase; D019206:GTP-Binding Protein alpha Subunits, Gi-Go; D020744:rac GTP-Binding Proteins; D014544:Uridine Triphosphate