text: Aspirin and sodium salicylate inhibit endothelin ETA receptors by an allosteric type of mechanism.
  Aspirin is a commonly used drug with a wide pharmacological spectrum including antiplatelet, anti-inflammatory, and neuroprotective actions. This study shows that aspirin and sodium salicylate, its major blood metabolite, reverse contractile actions of endothelin-1 (ET-1) in isolated rat aorta and human mammary arteries. They also prevent the intracellular Ca(2+) mobilizing action of ET-1 in cultured endothelial cells but not those of neuromedin B or UTP. Inhibition of the actions of ET-1 by salicylates is apparently competitive. Salicylates inhibit (125)I-ET-1 binding to recombinant rat ETA receptors. Salicylic acid promotes dissociation of (125)I-ET-1 ETA receptor complexes both in the absence and the presence of unlabeled ET-1. It has no influence on the rate of association of (125)I-ET-1 to ETA receptors. Salicylates do not promote dissociation of (125)I-ET-1 ETB receptor complexes. Salicylates potentiate relaxing actions of receptor antagonists such as bosentan. It is concluded that salicylates are allosteric inhibitors of ETA receptors. The results also suggest that: 1) irreversible ET-1 binding probably limits actions of receptor antagonists in vivo, and 2) an association of salicylates and ETA receptor antagonists should be used to evaluate the physiopathological role of ET-1 and may be of therapeutic interest in the treatment of ischemic heart disease.
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entities.type: CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL GENE-Y CHEMICAL GENE-Y GENE-Y GENE-Y GENE-N GENE-N GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y CHEMICAL GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y GENE-Y CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL CHEMICAL
entities.text: Salicylic acid (125)I (125)I Salicylates (125)I Salicylates bosentan Aspirin sodium salicylate ETA receptors Aspirin ET-1 ETA receptor ET-1 endothelin-1 ET-1 ET-1 neuromedin B ET-1 ET-1 rat ETA receptors salicylates ET-1 ETA receptor ET-1 ET-1 ETA receptors ET-1 ETB receptor ETA receptors salicylates aspirin sodium salicylate Ca(2+) salicylates Salicylates (125)I