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- W2000436995 abstract "The possibility that Ca2+ store depletion can stimulate contraction of the rat portal vein was investigated in functional experiments. Ca2+ stores were depleted with phenylephrine or cyclopiazonic acid in the absence of extracellular Ca2+ and then washed out for 30 min. Upon re-addition of extracellular Ca2+, a tonic contraction was produced, showing the stimulus for contraction was Ca2+ store depletion. The contractions were abolished by niflumic acid and nifedipine however, indicating they were dependent on depolarization resulting from opening of Ca2+-activated Cl- channels and Ca2+ influx through voltage-gated channels. Cumulative additions of phenylephrine below 3x10(-6) M did not produce tonic contractions but did in high K+ Krebs solution, where levcromakalim had no effect. This showed the tonic contractions were initially prevented by K+ channel opening. Increased Ca2+ entry through voltage-gated channels may therefore stimulate Ca2+-activated Cl- channels. Ca2+ store depletion could stimulate this by opening store-operated non-selective cation channels, resulting in depolarization." @default.
- W2000436995 created "2016-06-24" @default.
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- W2000436995 date "2005-03-01" @default.
- W2000436995 modified "2023-09-27" @default.
- W2000436995 title "Depletion of Ca2+ from intracellular stores of the rat portal vein stimulates a tonic contraction" @default.
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- W2000436995 doi "https://doi.org/10.1016/j.ejphar.2005.01.021" @default.
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