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• W2034972443 abstract "Inhibition of the K+-stimulated increase in cytosolic free Ca2+ by a series of 1,4-dihydropyridines was evaluated in A7r5 vascular smooth muscle cells loaded with the fluorescent Ca2+ indicator fura-2 acetoxymethyl ester. The IC50 of the drugs, added to suspended cells 3 min before 150 mM KCl, gave the following order of potency: lacidipine (2.76 nM) > nitrendipine (3.81 nM) > amlodipine (4.56 nM) > nifedipine (10.08 nM). A7r5 cells were also exposed to the 1,4-dihydropyridines, at their IC50, for 25 min, and then repeated washout cycles were performed before adding KCl. The Ca2+ channel blocking activity of nifedipine and nitrendipine gradually diminished, disappearing after four washout cycles 25, 55, 115 and 175 min after drug treatment. Amlodipine and lacidipine displayed slow onset and offset of antagonism, their activity becoming stronger with time, in spite of the repeated washes. [3H]Lacidipine was avidly and promptly entrapped in A7r5 cells and was not removed by washout. However, its potency as a Ca2+ channel blocker was not directly related to the amount of drug locked in the cell since it increased with time, indicating that lacidipine binds to the lipid bilayer of the cell membrane and then gradually diffuses towards a specific binding site. This model can, therefore, predict the Ca2+ blocking properties of 1,4-dihydropyridines with slow onset and offset of antagonism and could be employed to evaluate compounds selective for vascular smooth muscle." @default.
• W2034972443 created "2016-06-24" @default.
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• W2034972443 date "1993-01-01" @default.
• W2034972443 modified "2023-09-27" @default.
• W2034972443 title "Ca2+ channel blocking activity of lacidipine and amlodipine in A7r5 vascular smooth muscle cells" @default.
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• W2034972443 doi "https://doi.org/10.1016/0922-4106(93)90019-6" @default.
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