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Halothane attenuates nitroglycerin-induced vasodilation and a decrease in intracellular Ca2+ in the rat thoracic

H Tsuchida1, S Tanaka, S Seki

  • 1Department of Anesthesiology, Sapporo Medical University School of Medicine, Japan. tsuchida@kanazawa-med.ac.jp

Anesthesia and Analgesia
|July 2, 1999
PubMed
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Halothane inhibits nitroglycerin-induced vasodilation by affecting smooth muscle cell calcium levels. This study investigated halothane

Area of Science:

  • Pharmacology
  • Cardiovascular Physiology
  • Cellular Biology

Background:

  • Halothane is known to inhibit endothelium-mediated vasorelaxation, but its precise mechanism remains debated.
  • Cytosolic calcium concentration ([Ca2+]i) plays a critical role in smooth muscle contraction and relaxation.

Purpose of the Study:

  • To investigate the effects of halothane on nitroglycerin-induced vasorelaxation.
  • To determine if halothane's inhibitory effects are related to changes in cytosolic calcium ([Ca2+]i).

Main Methods:

  • Isolated rat thoracic aorta strips without endothelium were used for isometric tension recordings.
  • Nitroglycerin-induced vasorelaxation was measured in the presence of varying halothane concentrations (1.5% and 3%).
  • Cytosolic calcium ([Ca2+]i) was measured using fura-2 fluorescence during these experiments.

Related Experiment Videos

Main Results:

  • Nitroglycerin dose-dependently reduced muscle contractions, with [Ca2+]i decreasing to a plateau.
  • Halothane inhibited nitroglycerin-induced decreases in both muscle tension and [Ca2+]i.
  • This inhibition occurred regardless of the initial contraction level induced by norepinephrine.

Conclusions:

  • Halothane attenuates endothelium-independent vasorelaxation induced by nitroglycerin.
  • The mechanism involves the suppression of calcium dynamics within smooth muscle cells.
  • Halothane's action on [Ca2+]i contributes to its inhibitory effects on vasodilation.