Cardiovascular and renal effects of eel and rat atrial natriuretic peptide in rainbow trout, Salmo gairdneri

Kenneth Olson, Douglas W. Duff

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The renal and in vitro vascular effects of atrial natriuretic peptides have been examined in seveal species of fish. However, comparatively few investigations have described the effects of these peptides on the cardiovascular system in vivo. In the present experiments the dorsal aorta and urinary bladder were cannulated and the effects of atrial natriuretic peptides from rat and eel were monitored in conscious trout during bolus injection or continuous atrial natriuretic peptide infusion. The results show that the initial pressor effect of atrial natriuretic peptides is independent of environmental salinity adaptation (fresh or seawater) and the chemical form of atrial natriuretic peptide injected, but it is affected by the rate of atrial natriuretic peptide administration. This pressor response, and the accompanying diuresis, are mediated through α-adrenergic activation. Continuous infusion of either rat or eel atrial natriuretic peptide produces a steady fall in mean arterial blood pressure, which is temporally preceded by an increase in heart rate and a decrease in pulse pressure. Diuresis induced by atrial natriuretic peptides is only partially sustained during continuous infusion. Propranolol partially blocks the increase induced in heart rate by atrial natriuretic peptides, but does not affect either pulse pressure or mean arterial pressure. Propranolol significantly increases urine flow in saline-infused animals but has no apparent effect on animals subjected to infusions of atrial natriuretic peptides. These results indicate that there are multiple foci for the action of atrial natriuretic peptides in trout and that in many instances the effects of atrial natriuretic peptides are mediated through secondary effector systems.

Original languageEnglish
Pages (from-to)408-415
Number of pages8
JournalJournal of Comparative Physiology B
Volume162
Issue number5
DOIs
StatePublished - Jul 1992

Fingerprint

atrial natriuretic peptide
Eels
Oncorhynchus mykiss
Atrial Natriuretic Factor
eel
peptide
rainbow
kidneys
Kidney
rats
Arterial Pressure
diuresis
Trout
Diuresis
propranolol
Propranolol
trout
Animals
rat atrial natriuretic peptide
effect

Keywords

  • Blood pressure
  • Gill
  • Smooth muscle
  • Trout, Salmo gairdneri
  • Vascular resistance

ASJC Scopus subject areas

  • Physiology (medical)
  • Environmental Science(all)
  • Physiology
  • Animal Science and Zoology

Cite this

Cardiovascular and renal effects of eel and rat atrial natriuretic peptide in rainbow trout, Salmo gairdneri. / Olson, Kenneth; Duff, Douglas W.

In: Journal of Comparative Physiology B, Vol. 162, No. 5, 07.1992, p. 408-415.

Research output: Contribution to journalArticle

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