Mechanisms of altered contractile responses to vasopressin and endothelin in canine coronary collateral arteries

Julie A. Rapps, Allan W. Jones, Michael Sturek, Lawrence Magliola, Janet L. Parker

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Background: Mature coronary collateral arteries are hyperresponsive to vasopressin; in contrast, contractile responses of collaterals to endothelin are attenuated. Our goal was to determine the cellular mechanisms underlying these differences in reactivity using two sizes of canine collateral arteries isolated from hearts subjected to chronic coronary occlusion. Methods and Results: Contractile responses to vasopressin (100 nmol/L) were enhanced threefold to fourfold in near rests lance (≃200 μm lumen diameter) and conduit (≃500 μm lumen diameter) collateral arteries compared with similarly sized non collateral coronary arteries (P2+ (measured by use of fura-2 microfluorometry and Ca2+-dependent 42K+ efflux) in smooth muscle of collateral arteries than in smooth muscle of noncollateral arteries (P2+ were not different in smooth muscle of collateral and noncollateral arteries (P>.05). Conclusions: We conclude that altered contractile responsiveness of collateral arteries to vasopressin and endothelin does not result from altered synthesis/release of nitric oxide or prostaglandins. Parallel enhancement of vasopressin-mediated Ca2+ and contractile responses suggests increases in vasopressin receptor number, affinity, and/or efficiency of coupling mechanisms in collateral smooth muscle. The dissociation between endothelin-induced contractile and Ca2+ responses of collaterals indicates that the mechanisms involved in increasing Ca2+ sensitivity of contractile proteins during endothelin stimulation may be altered in collateral arteries.

Original languageEnglish (US)
Pages (from-to)231-239
Number of pages9
JournalCirculation
Volume95
Issue number1
StatePublished - 1997
Externally publishedYes

Fingerprint

Endothelins
Vasopressins
Canidae
Coronary Vessels
Arteries
Smooth Muscle
Cytophotometry
Contractile Proteins
Vasopressin Receptors
Fura-2
Coronary Occlusion
Prostaglandins
Nitric Oxide

Keywords

  • calcium
  • endothelin
  • muscle, smooth
  • vasopressin

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Mechanisms of altered contractile responses to vasopressin and endothelin in canine coronary collateral arteries. / Rapps, Julie A.; Jones, Allan W.; Sturek, Michael; Magliola, Lawrence; Parker, Janet L.

In: Circulation, Vol. 95, No. 1, 1997, p. 231-239.

Research output: Contribution to journalArticle

Rapps, Julie A. ; Jones, Allan W. ; Sturek, Michael ; Magliola, Lawrence ; Parker, Janet L. / Mechanisms of altered contractile responses to vasopressin and endothelin in canine coronary collateral arteries. In: Circulation. 1997 ; Vol. 95, No. 1. pp. 231-239.
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