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- W309871470 abstract "The changes in intracellular free calcium concentration ([Ca2+]i) induced by oxytocin in single cells of cultured human puerperal myometrium were measured with the calcium-sensitive fluorescent dye fura 2 in a digital imaging fluorescence microscopic system. Oxytocin at concentrations of 30-300 nmol/L induced a dose-dependent increase in [Ca2+]i with a peak at 20 seconds. This increase depended mainly on extracellular calcium ([Ca2+]ex) at concentrations of 0.6-4.8 mmol/L. In the absence of [Ca2+]ex, the increase was only 16% of that in its presence. The voltage-sensitive calcium channel blockers nicardipine, nifedipine, and nitrendipine had similar effects, causing significant suppression of the increase in [Ca2+]i induced by oxytocin. Diltiazem also suppressed the increase in [Ca2+]i, though less than the other calcium channel blockers. These data indicate that the increase in [Ca2+]i induced by oxytocin is predominantly dependent upon [Ca2+]ex. Furthermore, the data explain why calcium channel blockers are effective for weakening uterine muscle contractions and indicate which type of blocker is most effective." @default.
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- W309871470 date "1991-01-01" @default.
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- W309871470 title "Direct measurement of intracellular free calcium in cultured human puerperal myometrial cells stimulated by oxytocin: effects of extracellular calcium and calcium channel blockers." @default.
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