Abstract
ADP is an important platelet agonist causing shape change from smooth discoid shape to spiculated spheres and platelet aggregation. However, the molecular mechanisms involved in ADP-induced platelet activation have not been elucidated. We demonstrated earlier the existence of two distinct ADP receptors on platelets, one coupled to phospholipase C, P2TPLC, and the other to inhibition of adenylyl cyclase, P2TAC (Daniel, J. L., Dangelmaier, C., Jin, J., Ashby, B., Smith, J. B., and Kunapuli, S. P. (1998) J. Biol. Chem. 273, 2024-2029), in addition to the previously described P2X1 receptor. Here we report the cloning of a cDNA clone encoding the P2Y1 receptor from a human platelet cDNA library by homology screening with radiolabeled P2Y1-P2Y6 receptor cDNAs. ADP or 2-methyl(thio)-ADP-induced intracellular calcium increases were inhibited by the P2Y1 receptor-specific antagonists, adenosine 3'-phosphate 5'-phosphosulfate (A3P5PS), adenosine 3'-phosphate 5'-phosphate (A3P5P), and adenosine 2'-phosphate 5'-phosphate (A2P5P), in a concentration-dependent manner, but not by ARL 66096 or alpha, beta-MeATP. A3P5PS, A3P5P, and A2P5P also inhibited the shape change of aspirinated platelets induced by 10 microM ADP or 3 microM 2-methyl-(thio...Continue Reading
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