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• W2050760003 abstract "The non-steroidal anti-inflammatory drug nimesulide is a selective inhibitor of cyclooxygenase-2 which relaxes spontaneously contracting human myometrium in vivo and is potentially a useful tocolytic drug. Part of the relaxant action of nimesulide may be via block of myometrial Ca2+ channels. Here, we describe the Ca2+ channel blocking properties of nimesulide in freshly dispersed human term-pregnant myometrial smooth muscle cells (HMSMCs). Both L- and T-components of the whole cell Ca2+ channel current were inhibited by 100 microM nimesulide (38+/-3 and 35+/-1% block, respectively). At physiological pH inside and outside the cell (pHo/pHi = 7.4/7.2), this block did not depend on the holding or test potential, although a degree of use-dependence was observed during high frequency stimulation at a higher concentration of drug (300 microM). At pHo/pHi = 6.8, under which condition the concentration of the non-ionized form of the drug is increased 3 fold compared to pH 7.4, nimesulide blocked the L-type current more potently (58+/-3% inhibition at 100 microM, P<0.01) compared to physiological pH. Nimesulide caused a 7 mV leftward shift in the availability curve of the current at pH 6.8, suggesting that the affinity of the drug for the inactivated channel is approximately 4 fold higher than its affinity for the closed channel. We speculate that acidification and depolarization of the myometrium during the intense and prolonged contractions of labour might increase the potency of nimesulide as a Ca2+ channel antagonist, promoting its action as a tocolytic agent." @default.
• W2050760003 created "2016-06-24" @default.
• W2050760003 creator A5039134827 @default.
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• W2050760003 date "1999-07-01" @default.
• W2050760003 modified "2023-10-17" @default.
• W2050760003 title "Calcium antagonistic properties of the cyclooxygenase-2 inhibitor nimesulide in human myometrial myocytes" @default.
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• W2050760003 doi "https://doi.org/10.1038/sj.bjp.0702685" @default.
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