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- W95802018 abstract "Objective Amlodipine (Aml) has R- and S-isomers with different pharmacological effects. However, no data are available on the influence of (S)-Aml and (R)-Aml on L-type calcium channel current (I(Ca-L)) or cytosolic calcium (Ca2+). This study is to investigate effects on I(Ca-L) and cytosolic Ca2+. Methods I(Ca-L), peak currents, I-V curves, steady state activation curves, steady state inactivation curves and recovery curves from inactivation with (S)-Aml and (R)-Aml were recorded by whole-cell patch clamp configuration. Cytosolic Ca2+ of smooth muscle cells was assayed by Fura-2/AM. Results At the concentrations of 0.1, 0.5, 1, 5, and 10 micromol/L, 1.5 +/- 0.2%, 25.4 +/- 5.3%, 65.2 +/- 7.3%, 78.4 +/- 8.1%, and 94.2 +/- 5.0% of I(Ca-L) were blocked by (S)-Aml. I-V curves were shifted upward. Half-activation voltages were -16.01 +/- 1.65 mV, -17.61 +/- 1.60 mV, -20.17 +/- 1.46 mV, -21.87 +/- 1.69 mV and -24.09 +/- 1.87 mV (P 0.05). Conclusion Only (S)-Aml has calcium channel blockade activity, while (R)-Aml has none of the pharmacologic actions associated with CCBs." @default.
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- W95802018 date "2008-06-01" @default.
- W95802018 modified "2023-09-23" @default.
- W95802018 title "Effects of (S)-amlodipine and (R)-amlodipine on L-type calcium channel current of rat ventricular myocytes and cytosolic calcium of aortic smooth muscle cells." @default.
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