Quick stretch increases the production of inositol 1,4,5-trisphosphate (IP3) in porcine coronary artery

Life Sci. 1994;55(3):227-35. doi: 10.1016/0024-3205(94)00884-1.

Abstract

The present study was undertaken to know whether the formation of inositol 1,4,5-trisphosphate (IP3) is increased by quick stretch, a dynamic mechanical stimulus in porcine coronary artery in order to inquiry the possibility that IP3 could mediate Ca2+ release in the stretch-induced contraction. Quick stretching of a helical strip of porcine coronary artery at a rate of 10 cm/sec, the amount of stretch equivalent to 140% of the initial muscle length (= 100%), and the stimulus period of 30 sec with 20-min intervals, produced delayed contraction. Quick stretching increased the content of IP3 about three-fold over the control basal level, which always preceded the contraction. A putative phospholipase C inhibitor, 2-nitro-4-carboxyphenyl-N,N-diphenylcarbamate (NCDC), abolished the increase in the formation of IP3 and partially inhibited the stretch-induced contraction. The results suggest that quick stretching increases the formation of IP3 through a possible mechanism for activation of phospholipase C, which may lead to release of Ca2+ into myoplasm and to further activation of the contractile elements.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylcholine / pharmacology
  • Adrenergic beta-Antagonists / pharmacology
  • Animals
  • Atropine / pharmacology
  • Carbamates / pharmacology
  • Coronary Vessels / metabolism*
  • Coronary Vessels / physiology
  • Female
  • In Vitro Techniques
  • Inositol 1,4,5-Trisphosphate / metabolism*
  • Male
  • Muscle Contraction / drug effects
  • Muscle, Smooth, Vascular / physiology*
  • Nicardipine / pharmacology
  • Phenylcarbamates*
  • Swine
  • Type C Phospholipases / antagonists & inhibitors

Substances

  • Adrenergic beta-Antagonists
  • Carbamates
  • Phenylcarbamates
  • 2-nitro-4-carboxyphenyl-N,N-diphenylcarbamate
  • Atropine
  • Inositol 1,4,5-Trisphosphate
  • Nicardipine
  • Type C Phospholipases
  • Acetylcholine