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. 1981 Jun;315:21–30. doi: 10.1113/jphysiol.1981.sp013729

Calcium dependency of the inhibitory effect of antidiuretic hormone on in vitro renin secretion in rats.

P C Churchill
PMCID: PMC1249364  PMID: 7031229

Abstract

1. Synthetic arginine-vasopressin (ADH or antidiuretic hormone) inhibited renin secretory rate of rat renal cortical slices. The response was concentration-dependent and was maximal at 0.1 U . ml.-1. 2. Ca depletion (incubation of slices in medium containing Na2EGTA and no added CaCl2) stimulated renin secretion and eventually abolished the inhibitory effect of ADH. Both these effects were reversible. 3. The Ca antagonist D-600, at 0.5 microM, reversed the inhibitory effect of K depolarization on secretory rate but had no effect on secretory rate on on-depolarized slices. In the presence of 0.5 microM-D-600, ADH inhibited the secretory rate of either depolarized or non-depolarized slices. 4. These results confirm and extend previous observations suggesting that Ca plays an inhibitory coupling role in the control of renin secretion. Moreover they suggest that although Ca influx through voltage-sensitive Ca channels influences the secretory activity of juxtaglomerular cells, ADH activates an independent pathway for Ca mobilization.

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Selected References

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