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Central dipsogenic effect of vasopressin
The American Journal of Physiology
|March 1, 1982
Summary
This study explored how vasopressin (antidiuretic hormone, ADH) influences thirst. Findings suggest ADH may trigger thirst centrally, as direct brain administration increased water intake in dogs.
Area of Science:
- Neuroscience
- Endocrinology
- Physiology
Background:
- Thirst regulation is complex, involving hormonal and neural signals.
- Vasopressin, or antidiuretic hormone (ADH), is known for its role in water balance.
- Its potential role in directly stimulating thirst (dipsogenesis) requires further investigation.
Purpose of the Study:
- To investigate the potential role of vasopressin (ADH) in the central control of thirst.
- To determine if ADH administration into specific brain regions affects water intake.
Main Methods:
- Conscious dogs underwent electrical stimulation of the basal forebrain to induce ADH release.
- Antidiuretic hormone (ADH) was injected into the third cerebral ventricle (3rd V), lateral cerebral ventricle (LV), and carotid artery (CA).
- Water intake (WI), urine output, plasma osmolality (Posmol), and renal free-water reabsorption were monitored.
Main Results:
- Electrical stimulation increased blood ADH, decreased urine output, and induced spontaneous drinking.
- Intraventricular injection of ADH into the 3rd V significantly increased water intake, with peak effect at 0.10-0.15 mU.
- ADH administration into the LV and CA showed minimal or no effect on water intake.
Conclusions:
- The results indicate that vasopressin (ADH) may exert central dipsogenic effects.
- ADH appears to act within the brain, specifically the third ventricle region, to stimulate thirst.
- This suggests a direct role for ADH in the neural pathways controlling water intake.