title: ADP stimulates human endothelial cell migration via P2Y1 nucleotide receptor-mediated mitogen-activated protein kinase pathways.
abstract: Extensive research on the role of ADP in platelet activation led to the design of new anti-thrombotic drugs, such as clopidogrel (Plavix; sanofi-aventis); however, very little is known about the ADP-preferring nucleotide receptors (P2Y1, P2Y12, and P2Y13) in endothelium. Here, we show that ADP stimulates migration of cultured human umbilical vein endothelial cells (HUVECs) in both Boyden chamber and in vitro wound repair assays. This promigratory effect was mimicked by 2-MeSADP, but not by AMP, and was inhibited by MRS2179 (P2Y1 receptor antagonist) but not by AR-C69931MX (P2Y12/13 receptor antagonist). RT-PCR revealed abundant P2Y1, barely detectable P2Y12, and absent P2Y13 receptor message in these cells. In addition, both ADP and 2-MeSADP, but not AMP, activated the mitogen-activated protein kinase pathways as evidenced by increased phosphorylation of extracellular signal-regulated kinase (ERK)1/2, c-Jun N-terminal kinase (JNK), and p38 kinase. ADP also stimulated phosphorylation of p90RSK, a downstream substrate of phosphorylated ERK1/2, and induced phosphorylation of such transcription factors downstream of the JNK and p38 pathways as c-Jun and activating transcription factor-2. These signaling events were inhibited by MRS2179 but not by AR-C69931MX. Furthermore, blockade of the ERK or JNK pathways by U0126 and SP600125, respectively, abolished ADP- and 2-MeSADP-stimulated HUVEC migration. However, inhibition of the p38 pathway by SB203580 partially suppressed ADP- and 2-MeSADP-induced HUVEC migration. We conclude that ADP promotes human endothelial cell migration by activating P2Y1 receptor-mediated MAPK pathways, possibly contributing to reendothelialization and angiogenesis after vascular injury.
authors.affiliation: Department of Cell Biology, Lerner Research Institute, Cleveland Clinic Lerner College of Medicine, Cleveland Clinic Foundation, 9500 Euclid Ave, Cleveland, OH 44195, USA.
authors.forename: Jianzhong
authors.initials: J
authors.lastname: Shen
authors.forename: Paul E
authors.initials: PE
authors.lastname: DiCorleto
mesh_terms: D000244:Adenosine Diphosphate / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology*; D002465:Cell Movement / Q000187:drug effects / Q000502:physiology*; D002478:Cells, Cultured; D002633:Chemotaxis / Q000187:drug effects / Q000502:physiology; D042783:Endothelial Cells / Q000166:cytology* / Q000187:drug effects / Q000201:enzymology*; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D020935:MAP Kinase Signaling System / Q000187:drug effects / Q000502:physiology*; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D018048:Receptors, Purinergic P2 / Q000378:metabolism*; D058472:Receptors, Purinergic P2Y1; D013873:Thionucleotides / Q000494:pharmacology; D014471:Umbilical Veins / Q000166:cytology; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: C546382:P2RY1 protein, human; D018048:Receptors, Purinergic P2; D058472:Receptors, Purinergic P2Y1; D013873:Thionucleotides; C002480:methylthio-ADP; D000244:Adenosine Diphosphate; D048031:JNK Mitogen-Activated Protein Kinases; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D048051:p38 Mitogen-Activated Protein Kinases