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- W2046512980 abstract "The mechanism of calcium transport across the plasma membrane of chromaffin cells was studied using plasma membrane vesicles prepared from cells of adrenal medulla. Purification of the plasma membrane was about 30-fold, based on the alpha-bungarotoxin binding activity. The isolated membrane vesicles have both Na+/Ca2+ exchange and calcium pump activities. The Na+/Ca2+ exchange activity increased with the free calcium concentration and was not saturated at 1 mM, the highest concentration tried. The K1/2 of the calcium pump for calcium is 0.06 microM. Part of the Na+/Ca2+ exchange activity was inhibited by preincubation of the membrane vesicles with veratridine and the effect of veratridine was reversed by tetrodotoxin. The calcium taken up by the calcium pump was released by 0.005% saponin, but was not affected by oxalate. The calcium taken up by the calcium pump was released by exchanging with the external sodium, which suggests that the two calcium transport systems are located on the same population of membrane vesicles. The above evidence indicates that both calcium transport activities are located on the plasma membrane and not on contaminating organelle membranes. The significance of the two calcium transport systems in regulation of cytosolic calcium concentration of chromaffin cells is discussed." @default.
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- W2046512980 date "1990-06-01" @default.
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- W2046512980 title "Mechanism of Calcium Transport Across the Plasma Membrane of Bovine Chromaffin Cells" @default.
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- W2046512980 doi "https://doi.org/10.1111/j.1471-4159.1990.tb04900.x" @default.
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