首页> 外文期刊>Life sciences >Adrenomedullin stimulates calcium efflux from adrenal chromaffin cells in culture: possible involvement of an Na+/Ca2+ exchange mechanism.
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Adrenomedullin stimulates calcium efflux from adrenal chromaffin cells in culture: possible involvement of an Na+/Ca2+ exchange mechanism.

机译:肾上腺髓质素刺激培养物中肾上腺嗜铬细胞的钙外流:可能涉及Na + / Ca2 +交换机制。

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摘要

The effect of adrenomedullin, a hypotensive peptide, on Ca2+ efflux from cultured bovine adrenal chromaffin cells was examined. Adrenomedullin stimulated the efflux of 45Ca2+ from the cells in a concentration-dependent manner (10(-7)M - 3x10(-6)M). Adrenomedullin did not increase the intracellular free Ca2+ ([Ca2+]i) level and catecholamine secretion. The adrenomedullin-stimulated 45Ca2+ efflux was not inhibited by incubation with Ca2+-free medium, but was inhibited by incubation with Na+-free medium. These results indicate that adrenomedullin stimulates extracellular Na+-dependent 45Ca2+ efflux from cultured bovine adrenal chromaffin cells, probably through its stimulatory effect on membrane Na+/Ca2+ exchange.
机译:检查了降肾上腺素肾上腺髓质素对培养的牛肾上腺嗜铬细胞钙离子流出的影响。肾上腺髓质素以浓度依赖性方式(10(-7)M-3x10(-6)M)刺激细胞中45Ca2 +的流出。肾上腺髓质素不增加细胞内游离Ca2 +([Ca2 +] i)水平和儿茶酚胺分泌。肾上腺髓质素刺激的45Ca2 +外排不受无Ca2 +培养基孵育的抑制,但受无Na +培养基孵育的抑制。这些结果表明肾上腺髓质素可能通过其对膜Na + / Ca 2+交换的刺激作用而刺激了培养的牛肾上腺嗜铬细胞的胞外Na +依赖性45 Ca 2 +外排。

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