Potassium control of extrarenal renin secretion in transgenic (mRen-2)27 and normal rats

Pei Rong, Jennifer L. Wilkinson-Berka, Sandford L. Skinner

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4 Citations (Scopus)

Abstract

Plasma active renin and prorenin were followed for 12 h after bilateral, unilateral, and sham nephrectomy (BNx, UNx, and SNx) in anesthetized transgenic (mRen-2)27 rats to compare them with Sprague-Dawley and spontaneously hypertensive rats (SDR and SHR). In Ren-2 rats, active renin and prorenin increased with plasma potassium post-BNx and were augmented by potassium infusion. The increase in prorenin but not active renin was abolished by bilateral adrenalectomy (BADRx). However, this did not reduce prorenin below normal, indicating that the high plasma prorenin Ren-2 phenotype is not only of adrenal origin. SNx and UNx also raised plasma active renin and prorenin in Ren-2 rats, with positive correlations to plasma potassium. In SDR and SHR, active renin fell below prorenin post-BNx, and adrenal ablation and potassium loading (in SDR) modified the decreasing active renin profile consistent with low levels of regulated extrarenal secretion. In Ren-2 rats, adrenal but not extra-adrenal prorenin secretion is potassium sensitive and stress related. The unidentified source of active renin in BNx+BADRx Ren-2 rats is also potassium and stress related.

Original languageEnglish
JournalAmerican Journal of Physiology - Endocrinology and Metabolism
Volume277
Issue number4 40-4
Publication statusPublished - Oct 1999
Externally publishedYes

Keywords

  • Adrenal renin
  • Hypertension
  • Prorenin
  • Spontaneously hypertensive rat
  • Tissue renin

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