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- W2078352804 abstract "Endothelin-1 (ET-1) contracted the rabbit tracheal smooth muscle (RTSM), yielding a bell-shaped tension-concentration curve. Moreover, ET-1 induced concentration- and time-dependent increases in cAMP concentrations in RTSM (EC(50), 58 nM; t(1/2), 2.4 min). Pretreatment with the AC inhibitors, SQ-22536, or 2'-5'-dideoxyadenosine, enhanced contraction to ET-1 and converted its bell-shaped tension curve into a sigmoidal one, but left contraction to carbachol and KCl unaltered. The potent ET(B)-receptor agonists, ET-3 or sarafotoxin-c, mimicked ET-1's effects on cAMP levels (EC(50) values 55 and 50 nM). Further, cAMP formation by ETs was inhibited by BQ-788 (selective ET(B) receptor blocker; IC(50), 8 nM), but not by BQ-610 (selective ET(A) receptor blocker). Removal of the epithelium did not prevent ET-induced increases in cAMP levels. Unlike isoproterenol, ETs failed to activate AC in membrane fractions from RTSM. In intact RTSM, the c-PLA(2) inhibitor, AACOCF3, and the cyclooxygenase inhibitor, indomethacin, blocked ET-induced increases in cAMP levels. These findings reveal a novel, nonepithelial, c-PLA(2)-mediated, regulatory mechanism downstream from ET(B) receptors." @default.
- W2078352804 created "2016-06-24" @default.
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- W2078352804 date "2001-08-01" @default.
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- W2078352804 title "ETB Receptor Activates Adenylyl Cyclase via a c-PLA2-Dependent Mechanism: A Novel Counterregulatory Mechanism of ET-Induced Contraction in Airway Smooth Muscle" @default.
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- W2078352804 doi "https://doi.org/10.1006/bbrc.2001.5389" @default.
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