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- W2022016511 abstract "We describe here the pharmacology of (E)-N-[6-methoxy-5-(2-methoxyphenoxy)[2,2'-bipyrimidin]-4-yl]-2-phenylethenesulfonamide monopotassium salt (YM598), a novel selective endothelin ET(A) receptor antagonist synthesized through the modification of the ET(A)/ET(B) non-selective antagonist, bosentan. YM598 inhibited [125I]endothelin-1 binding to cloned human endothelin ET(A) and ET(B) receptor, with K(i) of 0.697 and 569 nM, and inhibited endothelin-1-induced increases in intracellular Ca(2+) concentration in human and rat endothelin ET(A) receptor. YM598 also inhibited endothelin-1-induced vasoconstriction in isolated rat aorta with a pA(2) value of 7.6. In vivo, YM598 inhibited the pressor response to big endothelin-1, a precursor peptide of endothelin-1. DR(2) values of YM598 in pithed rats were 0.53 mg/kg, i.v. and 0.77 mg/kg, p.o., and its antagonism in conscious rats was maintained for more than 6.5 h at 1 mg/kg, p.o. In contrast, YM598 had no effect on the sarafotoxin S6c-induced depressor or pressor responses. YM598 showed not only superior antagonistic activity and higher-selectivity for endothelin ET(A) receptor in vitro, but at least a 30-fold higher potency in vivo than bosentan. In conclusion, YM598 is a potent and orally active selective endothelin ET(A) receptor antagonist." @default.
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- W2022016511 date "2003-09-01" @default.
- W2022016511 modified "2023-09-27" @default.
- W2022016511 title "Pharmacological characterization of YM598, an orally active and highly potent selective endothelin ETA receptor antagonist" @default.
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- W2022016511 doi "https://doi.org/10.1016/j.ejphar.2003.08.031" @default.
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