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Pyridoxal-5'-phosphate-6-(2'-naphthylazo-6'-nitro-4',8'-disulfonat e) (PPNDS) potently antagonized P2X(1) receptor-mediated responses in rat vas deferens (pK(B)=7.43) and Xenopus laevis oocytes (pIC(50)=7. 84). It showed lower (up to 20,000-fold) inhibitory potency on ecto-nucleotidase in Xenopus oocytes and on P2Y(1) receptors in guinea-pig ileum(More)
Antagonistic effects of the novel suramin analogue 4,4',4",4"'-(carbonylbis(imino-5,1,3-benzenetriylbis(carbonylimino)))tetrakis-benzene-1,3-disulfonic acid (NF449) were studied on contractions of the rat vas deferens elicited by alpha,beta-methylene ATP (alphabetameATP; mediated by P2X1 receptors), contractions of the guinea-pig ileal longitudinal smooth(More)
Extracellular adenine and uracil 5'-nucleotides are important signalling molecules that exert a great variety of effects in numerous tissues and cell types through the activation of P2 receptors. In the past eight years, an extended series of P2 receptors (P2X(17), ionotropic subunits; P2Y(1,2,4,6,11,12), metabotropic receptors) has been cloned from(More)
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