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. 1994 Dec 6;91(25):12022–12026. doi: 10.1073/pnas.91.25.12022

Participation of the ascending serotonergic system in the stimulation of atrial natriuretic peptide release.

L C Reis 1, M J Ramalho 1, A L Favaretto 1, J Gutkowska 1, S M McCann 1, J Antunes-Rodrigues 1
PMCID: PMC45368  PMID: 7991577

Abstract

Results obtained in our laboratories have provided evidence for the participation of the hypothalamic atrial natriuretic peptide (ANP) neuronal system in the regulation of water and electrolyte homeostasis. The anterior ventral third ventricular (AV3V) region, a site of the perikarya of the ANP neurons, receives important afferent input from ascending serotoninergic axons. We hypothesized that the ascending serotoninergic tract might be involved in control of the liberation of ANP. Therefore, electrolytic lesions were produced in the mesencephalic dorsal raphé nucleus (DRN), the site of perikarya of serotonin (5-HT) neurons whose axons project to the AV3V region. Rats with sham lesions constituted the control group. In a second group of animals, the serotoninergic system was depleted of 5-HT by lateral ventricular administration of p-chlorophenylalanine (PCPA), an amino acid that causes depletion of 5-HT from the serotoninergic neurons. Control animals were injected with an equal amount of isotonic saline. The DRN lesions induced an increase of water intake and urine output beginning on the first day that lasted for 1 week after lesions were produced. There was a concomitant sodium retention that lasted for the same period of time. When water-loaded, DRN-lesioned and PCPA-injected animals showed diminished excretion of sodium, accompanied by a decrease in basal plasma ANP concentrations, and blockade of the increase in plasma ANP, which followed blood volume expansion by intraatrial injection of hypertonic saline. The results are interpreted to mean that ascending stimulatory serotoninergic input into the ANP neuronal system in the AV3V region produces a tonic stimulation of ANP release, which augments sodium excretion and inhibits water intake. Therefore, in the absence of this serotoninergic input following destruction of the serotoninergic neurons by DRN lesions or intraventricular injection of PCPA, an antinatriuretic effect is obtained that is associated with increased drinking, either because of sodium retention per se or removal of ANP-induced inhibition of release of the dipsogenic peptide, angiotensin II. The serotoninergic afferents also play an essential, stimulatory role in volume expansion-induced release of ANP and the ensuing natriuresis.

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Selected References

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