Compliance and smooth muscle reactivity of rainbow trout (Oncorhynchus mykiss) vessels in vitro

D. J. Conklin, Kenneth Olson

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Systemic veins have a profound influence on cardiac output in mammals. Venoregulatory mechanisms have not been adequately studied in fish and their existence has been questioned. In the present study, two characteristics of vascular mechanics, compliance and agonist-induced tension development, were investigated in rainbow trout vessels in vitro. Rapid compliance in the anterior cardinal vein and efferent branchial artery was calculated from step-wise changes in the volume-pressure curve of isolated vessel segments. Agonist-induced tension development was examined in four veins; anterior and posterior cardinals, intestinal and duct of Cuvier. Venous compliance was not altered in response to epinephrine, norepinephrine or angiotensin II, while efferent branchial artery compliance was decreased by 10-6 mol·l-1 epinephrine and norepinephrine but not angiotensin II. The ratios of venous to arterial compliance in vessels from two rainbow trout strains were similar (21:1 and 32:1) and consistent with the ratio reported for mammalian viens (24:1). Trout veins contracted in response to agonists in both an, agonist- and vesselspecific manner. The greatest tension per vessel wet weight was produced in anterior cardinal vein. The response pattern of anterior cardinal vein and duct of Cuvier were similar; acetylcholine, arginine vasotocin, epinephrine and norepinephrine, and the thromboxane A2 agonist, U-44,069, produced approximately identical contractions, whereas angiotensin II was virtually ineffective. Conversely, angiotensin II was more potent than epinephrine in posterior cardinal vein. In cumulative dose-response experiments, epinephrine was equipotent in anterior cardinal vein and duct of Cuvier, whereas the latter was less sensitive to acetylcholine. Both atrial natriuretic peptide and sodium nitroprusside relaxed precontracted veins. This is the first study to determine compliance in fish vessels and the contractile nature of different rainbow trout veins. These findings suggest that venous tone and therefore cardiac output in fish may be regulated by neural or humoral mechanisms.

Original languageEnglish
Pages (from-to)657-663
Number of pages7
JournalJournal of Comparative Physiology B
Volume163
Issue number8
DOIs
StatePublished - Mar 1994

Fingerprint

Oncorhynchus mykiss
compliance
smooth muscle
Compliance
rainbow
epinephrine
Smooth Muscle
Muscle
Veins
muscle
vessel
angiotensin II
Epinephrine
agonists
Angiotensin II
norepinephrine
Ducts
Fish
Norepinephrine
acetylcholine

Keywords

  • Catecholamines
  • Contraction
  • Fish veins
  • Trout, Oncorhynchus
  • Vasoactive peptides

ASJC Scopus subject areas

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

Cite this

Compliance and smooth muscle reactivity of rainbow trout (Oncorhynchus mykiss) vessels in vitro. / Conklin, D. J.; Olson, Kenneth.

In: Journal of Comparative Physiology B, Vol. 163, No. 8, 03.1994, p. 657-663.

Research output: Contribution to journalArticle

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