Journal article
Contrasting effects of vasopressin on baroreflex inhibition of lumbar sympathetic nerve activity
The American journal of physiology, Vol.249(5 Pt 2), pp.H922-928
11/1985
DOI: 10.1152/ajpheart.1985.249.5.H922
PMID: 4061669
Abstract
Baroreflex inhibition of lumbar sympathetic nerve activity (LSNA) during intravenous infusions of phenylephrine and vasopressin is contrasted in rats and rabbits. In rabbits, vasopressin caused smaller increases in arterial pressure and greater inhibition of LSNA than phenylephrine. In Sprague-Dawley rats, however, both vasopressin and phenylephrine caused equivalent increases in arterial pressure and reflex reductions in LSNA. The inhibition of LSNA was mediated through the arterial baroreceptors in both species because it was abolished by sinoaortic denervation. In rats, the possibility that a high level of endogenous vasopressin may have prevented the demonstration of a facilitated baroreflex with the infusion of exogenous vasopressin is unlikely since vasopressin also did not facilitate the reflex in Brattleboro rats, which lack circulating vasopressin. Further, Sprague-Dawley rats were responsive to exogenous vasopressin since infusion of increasing doses of vasopressin caused significant increases in urinary osmolality as well as progressive increments in arterial pressure. The results indicate that intravenous vasopressin given for a period of 6 min facilitates the reflex inhibition of LSNA mediated through arterial baroreceptors in rabbits, but not in rats. Vasopressin given for a period of up to 45 min to rats also fails to facilitate baroreflexes, emphasizing the difference from rabbits. In rabbits, this facilitation appears to involve a central mechanism.
Details
- Title: Subtitle
- Contrasting effects of vasopressin on baroreflex inhibition of lumbar sympathetic nerve activity
- Creators
- Fouad M SharabiGary B GuoFrancois M AbboudMarc D ThamesPhillip G Schmid
- Resource Type
- Journal article
- Publication Details
- The American journal of physiology, Vol.249(5 Pt 2), pp.H922-928
- Publisher
- United States
- DOI
- 10.1152/ajpheart.1985.249.5.H922
- PMID
- 4061669
- ISSN
- 0002-9513
- eISSN
- 2163-5773
- Grant note
- HL-27068 / NHLBI NIH HHS HL-24227 / NHLBI NIH HHS HL-14388 / NHLBI NIH HHS
- Language
- English
- Date published
- 11/1985
- Academic Unit
- Molecular Physiology and Biophysics; Cardiovascular Medicine; Fraternal Order of Eagles Diabetes Research Center; Internal Medicine
- Record Identifier
- 9984025465002771
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