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- W3204301412 abstract "Both human and rat myometrium express stromal interaction molecule (STIM) and Orai/transient receptor potential canonical (TRPC) proteins, which are components of plasma membrane Ca2+ store-operated channels. There are reports that these proteins mediate agonist-induced Ca2+ influx in cultured myometrial cells. In this study, we aimed to determine the effects of Pyr6, an Orai channel blocker, on different agonist-induced contractions in isolated segments of rat uterus.In Ca2+ -free Tyrode's solution, Pyr6 (3 μM) promoted a reduction in both the magnitude and frequency of Ca2+ (1 mM)-induced uterine contractions after the addition of carbachol (CCh, 100 μM), but not after the addition of oxytocin (OT, 150 nM). In Ca2+ (0.18 mM)-Tyrode's solution, Pyr6 completely relaxed uterine contractions induced by both CCh and cloprostenol (300 nM), but not those induced by either KCI (40-80 mM) or OT. The addition of Pyr6 abolished the oscillatory uterine contractions induced by Ca2+ after the addition of cyclopiazonic acid (CPA, 10 μM). When pre-incubated (5 min), Pyr6 reduced the magnitude of both CCh-induced phasic and tonic contractions. The addition of Pyr2 (3 μM), an Orai and TRPC channel blocker, abolished uterine contractions induced by CCh or OT.Considering Pyr6 as an Orai channel blocker and its inhibitory effect on uterine contractions induced by CCh, CPA, and cloprostenol, we suggest that Orai channels are required for the maintenance of contractions induced by these agonists in rat uterus." @default.
- W3204301412 created "2021-10-11" @default.
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- W3204301412 date "2021-09-27" @default.
- W3204301412 modified "2023-10-17" @default.
- W3204301412 title "Inhibitory effect of Pyr6 (an Orai channel blocker) on agonist‐induced contractions in rat uterus" @default.
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- W3204301412 doi "https://doi.org/10.1111/jog.15034" @default.
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