Angiotensin-induced steroidogenesis in rabbit adrenal: effects of pH and calcium.


The effect of variations in pH and Ca2+ on angiotensin II (A-II)-induced steroidogenesis was tested on isolated adrenal glomerulosa cell suspensions. The results show that a reduction in pH from 7.4 to 6.5 produces both a shift to the left of the A-II dose-response curve as well as an increase in maximum steroid production. In contrast, removal of Ca2+ from the incubation medium virtually abolished steroidogenesis to A-II (5 X 10(-9)M(, KCl(10mM) and ACTH (250 microU/ml). The Ca2+ antagonist D-600, however, was less effective than simple removal of Ca2+ as 10(-4) M was required to block the steroidogenic response to these same agonists. The results indicate that the response characteristics of this system to A-II resemble most closely those seen with isolated arterial smooth muscle - especially rabbit aortic strips.

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@article{Chiu1979AngiotensininducedSI, title={Angiotensin-induced steroidogenesis in rabbit adrenal: effects of pH and calcium.}, author={Andrew T. Chiu and R J Freer}, journal={Molecular and cellular endocrinology}, year={1979}, volume={13 2}, pages={159-66} }