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Ca(2+) channel blockers, such as amlodipine, inhibit vascular smooth muscle cell (VSMC) growth through interactions with targets other than L-type Ca(2+) channels. The effects of amlodipine on Ca(2+) movements in thrombin- and thapsigargin-stimulated VSMCs were therefore investigated by determining the variations of intracellular free Ca(2+) concentration in fura 2-loaded cultured VSMCs. Results indicated that 10-1,000 nM amlodipine inhibited 1) thrombin-induced Ca(2+) mobilization from a thapsigargin-sensitive pool and 2) thapsigargin-induced Ca(2+) responses, including Ca(2+) mobilization from internal stores and store-operated Ca(2+) entry. These effects of amlodipine do not involve L-type Ca(2+) channels and could not be reproduced with 100 nM isradipine, diltiazem, or verapamil. The inhibition by amlodipine of Ca(2+) mobilization appears therefore to be a specific property of the drug, in addition to its Ca(2+) channel-blocking property. It is suggested that amlodipine acts in this capacity by interacting with Ca(2+)-ATPases of the sarcoplasmic reticulum, thus modulating the enzyme activity. This mechanism might participate in the inhibitory effect of amlodipine on VSMC growth.

Amlodipine inhibits thapsigargin-sensitive Ca2+stores in thrombin-stimulated vascular smooth muscle cells

Amlodipine inhibits thapsigargin-sensitive Ca²⁺stores in thrombin-stimulated vascular smooth muscle cells