Key result
The subfornical organ contains dipsogenic receptors for circulating angiotensin II, as demonstrated by drinking responses to direct application and elimination of responses following ablation.
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Experimental animal study demonstrates subfornical organ mediates angiotensin II–induced drinking in rats, indicating it houses central receptors for bloodborne thirst signals.
The proposal of the subfornical organ (SFO) as a site of receptors for drinking induced by angiotensin II (AII) was investigated with several mutually confirmatory experiments. Intracranial injections of physiological doses of AII elicited drinking if and only if applied directly to the SFO (Experiment I). Ablation of the SFO selectively (Experiment 2) and permanently (Experiment 4) eliminated drinking elicited by physiological doses of intravenously infused AII. Animals in which SFO had been ablated responded normally to cellular dehydration but reduced responding to the extracellular thirsts of beta-adrenergic activation and hyperoncotic colloid dialysis (Experiment 3). Infusion of saralasin, an AII antagonist, directly into the SFO selectively and reversibly antagonized intravenous AII drinking (Experiment 5). The hypothesis that the SFO contains dipsogenic receptors for circulating AII is strongly supported.
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Simpson et al. (1978) studied Thirst induced by angiotensin II. Intracranial injections of angiotensin II, SFO ablation, and saralasin infusion was evaluated on Drinking elicited by angiotensin II. The subfornical organ contains dipsogenic receptors for circulating angiotensin II, as demonstrated by drinking responses to direct application and elimination of responses following ablation.
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