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- W1965710801 abstract "In a solution containing La3+, or one without Ca2+ (Ca2+-free) and containing 1.0 mM ethylene glycol bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid (EGTA), norepinephrine (NE)-induced transient contractions in rabbit aorta attributed to Ca2+ release are depressed 31 and 38%, respectively, by an approximate ED60 relaxing concentration of nicorandil (SG-75). In addition, after 15 min in a Ca2+-free, low-EGTA (0.01 mM) solution, plus D600 to eliminate any potential-dependent Ca2+ entry, NE elicits a similar phasic response that is attenuated 34% by SG-75. Apparently, this is primarily due to inhibition of Ca2+ release rather than to stimulation of rebinding, uptake, and/or extrusion of Ca2+ following release. For, when tissues initially exposed to a Ca2+-free, low-EGTA plus D600 solution with or without SG-75 and NE are then rinsed with the same solution for 20 min to remove SG-75 and/or NE and again exposed to NE there is only a small residual maintained response in tissues not exposed to SG-75. However, in tissues that have been exposed to SG-75 prior to NE, a measurable phasic response is elicited that is approximately 50% of control NE responses. When Ca2+ is added to a Ca2+-free, low-EGTA plus D600 solution after NE-induced Ca2+ release, a rapid and significant increase in tension ensues that is well maintained and is proposed to represent specific alpha-adrenoceptor-mediated Ca2+ entry. This NE-mediated, D600-insensitive Ca2+ entry is readily inhibited or relaxed by SG-75.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1965710801 date "1987-01-01" @default.
- W1965710801 modified "2023-09-24" @default.
- W1965710801 title "Effects of Nicorandil on Receptor-Mediated Ca2+ Release and Ca2+ Entry in Vascular Smooth Muscle" @default.
- W1965710801 doi "https://doi.org/10.1097/00005344-198700108-00008" @default.
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