title: G alpha(q/11)-coupled P2Y2 nucleotide receptor inhibits human keratinocyte spreading and migration.
abstract: Reepithelialization is a critical step in wound healing. It is initiated by keratinocyte migration at the wound edges. After wounding, extracellular nucleotides are released by keratinocytes and other skin cells. Here, we report that activation of P2Y2 nucleotide receptor by ATP/UTP inhibits keratinocyte cell spreading and induces lamellipodium withdrawal. Kymography analysis demonstrates that these effects correlate with a durable decrease of lamellipodium dynamics. P2Y2 receptor activation also induces a dramatic dismantling of the actin network, the loss of alpha3 integrin expression at the cell periphery, and the dissolution of focal contacts as indicated by the alteration of alpha(v) integrins and focal contact protein distribution. In addition, activation of P2Y2R prevents growth factor-induced phosphorylation of Erk(1,2) and Akt/PkB. The use of a specific pharmacological inhibitor (YM-254890), the depletion of G alpha(q/11) by siRNA, or the expression of a constitutively active G alpha(q/11) mutant (Q209L) show that activation of G alpha(q/11) is responsible for these ATP/UTP-induced effects. Finally, we report that ATP delays growth factor-induced wound healing of keratinocyte monolayers. Collectively, these findings provide evidence for a unique and important role for extracellular nucleotides as efficient autocrine/paracrine regulators of keratinocyte shape and migration during wound healing.
authors.affiliation: CISMET, FRE CNRS 2737, Faculté de Pharmacie, Université d'Aix-Marseille, France.
authors.forename: Salma
authors.initials: S
authors.lastname: Taboubi
authors.forename: Julie
authors.initials: J
authors.lastname: Milanini
authors.forename: Estelle
authors.initials: E
authors.lastname: Delamarre
authors.forename: Fabrice
authors.initials: F
authors.lastname: Parat
authors.forename: Françoise
authors.initials: F
authors.lastname: Garrouste
authors.forename: Gilbert
authors.initials: G
authors.lastname: Pommier
authors.forename: Jun
authors.initials: J
authors.lastname: Takasaki
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Hubaud
authors.forename: Hervé
authors.initials: H
authors.lastname: Kovacic
authors.forename: Maxime
authors.initials: M
authors.lastname: Lehmann
mesh_terms: D045744:Cell Line, Tumor; D002464:Cell Migration Inhibition; D002465:Cell Movement / Q000502:physiology*; D002478:Cells, Cultured; D043802:GTP-Binding Protein alpha Subunits, Gq-G11 / Q000378:metabolism*; D006801:Humans; D015603:Keratinocytes / Q000166:cytology* / Q000378:metabolism*; D011554:Pseudopodia / Q000502:physiology; D018048:Receptors, Purinergic P2 / Q000502:physiology*; D058473:Receptors, Purinergic P2Y2; D014945:Wound Healing / Q000502:physiology
chemical_list: C546385:P2RY2 protein, human; D018048:Receptors, Purinergic P2; D058473:Receptors, Purinergic P2Y2; D043802:GTP-Binding Protein alpha Subunits, Gq-G11