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The binding site within the L-type Ca 2+ channel Ca v 1.2 for neutral dihydropyridines is well characterized. However, the contributions of the alkylamino side chains of charged dihydropyridines such as amlodipine and nicardipine to channel block are not clear. We tested the hypothesis that the distinct locations of the charged side chains on amlodipine and nicardipine would confer...
The whole-cell patch clamp technique was used to investigate the effect of the dihydropyridine antagonist nicardipine and its two enantiomers on calcium and outward currents in rat pars intermedia cells. Inward voltage-activated calcium currents as well as outward currents were blocked by nicardipines (enantiomers and racemic substance). We found a highly significant correlation between the blockage...
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