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Mechanisms by which nephrectomy stimulates adrenal renin
Hypertension (Dallas, Tex. : 1979)
|November 1, 1986
Summary
Nephrectomy stimulates adrenal renin release through pituitary hormones like ACTH, elevated potassium levels, and reduced angiotensin II feedback. These factors collectively regulate adrenal renin response post-nephrectomy.
Area of Science:
- Endocrinology
- Renal Physiology
Background:
- Renin is present in the adrenal gland.
- Nephrectomy is a potent stimulator of adrenal renin.
Purpose of the Study:
- To investigate the mechanism by which nephrectomy stimulates adrenal renin.
- To identify the key factors influencing adrenal renin response to nephrectomy.
Main Methods:
- Hypophysectomy and adrenocorticotropic hormone (ACTH) administration in rats.
- Treatment with sodium polystyrene sulfonate to prevent hyperkalemia.
- Intraperitoneal infusion of angiotensin II.
Main Results:
- Hypophysectomy abolished the adrenal renin response to nephrectomy; ACTH restored it.
- High doses of ACTH in intact rats did not replicate nephrectomy-induced levels.
- Preventing hyperkalemia with sodium polystyrene sulfonate reduced the adrenal renin response.
- Angiotensin II infusion inhibited the rise in adrenal renin despite increased potassium and corticosterone.
Conclusions:
- Adrenal renin response to nephrectomy is influenced by the pituitary (ACTH), high plasma potassium, and lack of angiotensin II feedback.
- The contribution of elevated adrenal renin to high aldosterone post-nephrectomy requires further investigation.