The effects of calcium and calcium-ionophores (X 537 A and A 23187) on renin release in the isolated perfused rat kidney.

U Schwertschlag, E Hackenthal, R Hackenthal, G H Rohs
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Abstract

1. Calcium depletion from the medium of the isolated perfused kidney reduced renin release and renal perfusate flow. 2. Reintroduction of calcium increased renin release and perfusate flow. 3. The ionophore X 537 A (0.1-4 micromol/1) increased renin release both in the presence and absence of calcium in the medium. 4. The ionophore A 23187 (1-10 nmol/1) increased as well as decreased renin release. There was a positive correlation between direction of this effect and renal perfusate flow. 5. The results are compatible with the view that the effects of calcium and ionophores on renin release are the sum of direct and indirect effects of these agents, the predominant indirect effect being the modification of vascular tone.

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钙和钙离子载体(X 537a和A 23187)对离体灌注大鼠肾脏肾素释放的影响。
1. 离体灌注肾介质中钙的耗竭减少肾素释放和肾灌注血流。2. 重新引入钙增加肾素释放和灌注血流量。3.离子载体x537a(0.1-4微摩尔/1)在培养基中存在和不存在钙时均增加肾素释放。4. 离子载体a23187 (1 ~ 10 nmol/1)的释放量增加,肾素释放量减少。这种效应的方向与肾灌注血流呈正相关。5. 这些结果与钙离子载体对肾素释放的影响是这些药物的直接和间接作用的总和,主要的间接作用是血管张力的改变。
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Proceedings of the Fifth Meeting of the International Society of Hypertension, Paris, 12-14 June 1978. Brain catecholamines and catecholamine-synthesizing enzymes in renovascular hypertension in the rat. Enhanced hypothalamic noradrenaline biosynthesis in Goldblatt I renovascular hypertension. Definitive evidence for renin in rat brain by affinity chromatographic separation from protease. Renal release of active and inactive renin in essential and renovascular hypertension.
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