Abstract
Continuous sucrose density gradient subfractions from bovine adrenal medullary microsomes were found to accumulate 45Ca 2+ in the presence of ATP and ammonium oxalate mainly in subfractions of intermediate density. (Na + + K +)-ATPase (plasma membrane marker) and Ca 2+-ATPase activities were also concentrated in these intermediate subfractions but thiamine pyrophosphatase (Golgi apparatus marker) was not. NADH oxidase (endoplasmic reticulum marker) activity was distributed throughout all subfractions. 45Ca 2+ accumulation in adrenal cortical microsomes was found to rise and fall in parallel with thiamine pyrophosphatase but not with (Na + + K +)- ATPase or NADH oxidase activities. Accumulation of 45Ca 2+ in membrane vesicles in these experiments suggests the existence of a calcium transfer mechanism in plasma membranes of the adrenal medulla but not adrenal cortex.
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