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- W2043970416 abstract "Endothelins (ET-1, ET-2, ET-3) are a family of regulatory peptides with diverse biological functions, including modulation of smooth muscle tone. To evaluate the possible role of endothelins in the control of the detrusor smooth muscle of urinary bladder, we have investigated the responses of isolated strips of bladder dome and base to endothelins, in organ chambers, and characterized the receptors for these isopeptides in bladder membranes. ET-1, ET-2 and to a lesser extent ET-3 caused sustained concentration-dependent contraction of bladder dome and base. The contraction to endothelins, unlike the short-lived contraction produced by cholinergic agents, was long lasting and difficult to wash out. Equilibrium binding studies demonstrated that endothelin isoforms bound to bladder membrane receptors specifically, with high affinity (KD of 0.4–0.6 nM) and limited capacity (60-420 fmol/mg protein). Competition analysis showed two populations of receptors: one with high affinity for ET-1 and ET-2 and low affinity for ET-3 and another with high affinity for ET-1, ET-2 and ET-3. Chemical affinity labeling of endothelins to bladder membranes demonstrated that ET-1 and ET-2 were cross-linked to three proteins (75, 52 and 34 kDa, respectively), whereas ET-3 was cross-linked mainly to a 34 kDa protein. The data obtained from equilibrium binding studies, competition analysis and cross-linking experiments suggest that at least two endothelin receptor subtypes exist in bladder tissue. These observations further suggest that bladder smooth muscle tone may be modulated by endothelin or an endothelin-like substance via interaction with specific receptor sites." @default.
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- W2043970416 date "1990-07-01" @default.
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- W2043970416 title "Endothelins induced the acute release of tissue-type plasminogen activator and of von Willebrand factor from endothelial cells" @default.
- W2043970416 doi "https://doi.org/10.1016/0014-2999(90)92129-7" @default.
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