Abstract
The earliest reported endothelin (ET) receptor antagonists were peptide in nature and arose structurally from relatively minor modifications to endothelin-1 (ET-1) (Spinella 1991). The most significant early departure from this paradigm came with the discovery of BE-18257B, a competitive and selective endothelin-A (ETA) receptor antagonist isolated from the fermentation products of Streptomyces misakiensis (Ihara 1991). BE-18257B is a cyclic pentapeptide, cyclo(D-Trp-D-Glu-Ala-D-Allo-Ile-Leu), which binds selectively to ETA receptors with an IC50 of 1.4 μmol/l (porcine aortic smooth muscle cells) and functionally antagonizes ET-1 induced vasoconstriction in the rabbit iliac artery with a pA2 of 5.9. Shortly after the discovery of BE-18257B, a similar series of cyclic pentapeptides was identified from a strain of Streptomyces (Miyata 1992). The most potent compound in this series, WS-7338B, is structurally identical to BE-18257B. In vivo evaluation in the spontaneously hypertensive rat showed that pretreatment with 10 mg/kg of WS-7338B reduced the pressor effect of ET-1 (3.2μg/kg; 55% inhibition), while leaving unaffected the initial depressor response, the pressor and depressor responses being mediated by ETA and endothelin-B (ETB) receptors, respectively. While the selectivity profile of BE-18257B is attractive, the moderate activity and poor water solubility of the compound have restricted its use as a tool in pharmacological studies. Chemical modification of BE-18257B led to a series of antagonists which not only exhibit higher affinity for the ETA receptor but also possess good solubility in aqueous solution.
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Elliott, J.D., Xiang, JN. (2001). Endothelin Receptor Antagonists. In: Warner, T.D. (eds) Endothelin and Its Inhibitors. Handbook of Experimental Pharmacology, vol 152. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56899-2_9
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