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Circulating angiotensin II mediates sodium appetite in adrenalectomized rats
G H Schoorlemmer1, A K Johnson, R L Thunhorst
1Department of Psychology, University of Iowa, 11 Seashore Hall E., Iowa City, IA 52242-1407, USA.
Summary
Circulating angiotensin II (ANG II) significantly drives sodium appetite in adrenalectomized rats. Blocking ANG II production reduces salt intake, while ANG II infusion restores it, highlighting its critical role in salt regulation.
Area of Science:
- Physiology
- Endocrinology
- Neuroscience
Background:
- Adrenalectomy disrupts hormonal regulation of fluid and electrolyte balance.
- Sodium appetite is a critical behavior for maintaining homeostasis.
Purpose of the Study:
- To investigate the role of circulating angiotensin II (ANG II) in mediating sodium appetite following adrenalectomy.
- To determine if peripheral ANG II production is essential for salt seeking behavior.
Main Methods:
- Adrenalectomized rats were subjected to sodium deprivation.
- Captopril was administered intravenously to inhibit ANG II production.
- Sodium intake and blood pressure were measured.
- Intracerebroventricular injections of ANG I and intravenous infusions of ANG II were used to assess responses.
Main Results:
- Captopril treatment significantly reduced sodium intake without altering sodium depletion or hypovolemia.
- Peripheral ANG II blockade inhibited sodium appetite, while ANG II reinfusion restored it.
- Central ANG I administration stimulated water and salt intake, indicating intact brain pathways.
Conclusions:
- Circulating ANG II plays a major role in mediating sodium appetite in adrenalectomized rats.
- Peripheral ANG II production is crucial for the expression of salt appetite after adrenalectomy.