The effects of diminishing albumin binding to some endothelin receptor antagonists

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Abstract

As a pharmacological class, Endothelin-A receptor (ET(A)) antagonists are highly bound (>98%) to serum albumin. In the presence of physiological concentrations of albumin, their affinities for ET(A) decrease 10 to 100 fold. We have prepared ET(A) antagonists which exhibit lower degrees of binding to albumin, while maintaining potency and selectivity for the ET(A) receptor. The protein induced IC50shift is reduced or eliminated in this new series of compounds. The compounds also display altered in vivo and pharmacokinetic profiles which may be consistent with their lower degree of protein binding.

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Szczepankiewicz, B. G., Bal, R. B., Von Geldern, T. W., Wu-Wong, J. R., Chiou, W. J., Dixon, D. B., … Nguyen, B. N. (1998). The effects of diminishing albumin binding to some endothelin receptor antagonists. Life Sciences, 63(21), 1905–1912. https://doi.org/10.1016/S0024-3205(98)00466-4

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