Abstract
Ca 2+ channels involved in the endothelin-1-induced mitogenic response of cultured rat thoracic aorta smooth muscle cells, A7r5 cells, were characterized using the Ca 2+ channel blockers, LOE 908 and SK&F 96365. Stimulation of A7r5 cells with endothelin-1 induced a mitogenic response as well as a biphasic increase in the intracellular-free Ca 2+ concentration. Based on the sensitivity to nifedipine, a specific blocker of L-type voltage-operated Ca 2+ channel (VOCC), Ca 2+ influx through VOCC has a minor role in endothelin-1-induced mitogenic responses. On the other hand, Ca 2+ influx through voltage-independent Ca 2+ channels (VICCs) plays an important part in endothelin-1-induced mitogenesis. Moreover, based on their sensitivity to SK&F 96365 and LOE 908, VICCs consist of two types of Ca 2+-permeable nonselective cation channels (designated NSCC-1 and NSCC-2) and a store-operated Ca 2+ channel (SOCC). Ca 2+ influx through NSCC-1, NSCC-2 and SOCC contributes to 35%, 30% and 35%, respectively, to the nifedipine-resistant component of the endothelin-1 mitogenic response.
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