Summary
The effects of three experimental conditions on the concentration of plasma renin substrate were studied with special reference to plasma renin concentration in unilaterally nephrectomized rats.
After simultaneous bilateral nephrectomy the maximum increase in plasma renin substrate was 17 times higher than normal within 24 h, while in rats which were unilaterally nephrectomized 10 days previously, followed by the removal of the remaining kidney (two-step bilateral nephrectomy), the maximum increase in plasma renin substrate was markedly suppressed (6-fold of normal). The maximum increases in plasma renin substrate by estradiol treatment in normal and unilaterally nephrectomized rats were about the same, associated with similarly decreased plasma renin concentrations. The similar increase in plasma renin substrate was found after ureteral ligation in unilaterally nephrectomized rats and bilateral ligation of the ureters in normal rats. This was the case where the plasma renin concentrations changed differently after ureteral ligation. After two-step bilateral nephrectomy plus estradiol treatment the maximum increase in plasma renin substrate was found to be higher than that found after two-step bilateral nephrectomy, but was lower than that after simultaneous bilateral nephrectomy.
It is suggested that under the pathological conditions that stimulate renin substrate production, the plasma rein substrate concentration is less affected by circulating renin.
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This work was supported in part by a grant No. 048212 from the Japanese Ministry of Education
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Hiwada, K., Tanaka, H. & Kokubu, T. The influence of nephrectomy, ureteral ligation, and of estradiol on plasma renin substrate in unilaterally nephrectomized rats. Pflugers Arch. 365, 177–182 (1976). https://doi.org/10.1007/BF01067016
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DOI: https://doi.org/10.1007/BF01067016