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  • Title: Pharmacology of endothelin receptor antagonists ABT-627, ABT-546, A-182086 and A-192621: ex vivo and in vivo studies.
    Author: Wessale JL, Adler AL, Novosad EI, Calzadilla SV, Dayton BD, Marsh KC, Winn M, Jae HS, von Geldern TW, Opgenorth TJ, Wu-Wong JR.
    Journal: Clin Sci (Lond); 2002 Aug; 103 Suppl 48():112S-117S. PubMed ID: 12193067.
    Abstract:
    Endothelins (ETs), 21-amino-acid peptides involved in the pathogenesis of various diseases, bind to ET(A) and ET(B) receptors to initiate their effects. Based on the same core structure, we have developed four small-molecule ET receptor antagonists, ABT-627 (atrasentan), ABT-546, A-182086 and A-192621, which exhibit differences in selectivity for ET(A) and ET(B) receptors. In this report, we compare the efficacy, potency and pharmacokinetic properties of these four antagonists, including potency in inhibiting ET-1- or Sarafotoxin 6c-induced vessel constriction in isolated arteries and efficacy in antagonizing ET-1-, big ET-1- or Sarafotoxin 6c-induced pressor responses in rats.
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