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Calcium dependent and independent endothelin-1-induced contraction of human omentum vessels

P A Watt1, A R Baker, H Thurston

  • 1Department of Medicine, Leicester Royal Infirmary, UK.

Journal of Human Hypertension
|June 1, 1991
PubMed

Insights

Endothelin-1 causes artery contraction through calcium channels and protein kinase C. Blocking both pathways fully prevents this vasoconstrictor effect.

Area of Science:

  • Vascular biology
  • Pharmacology

Background:

  • Endothelin-1 is a potent vasoconstrictor peptide derived from the endothelium.
  • Understanding its mechanisms is crucial for managing vascular tone.

Purpose of the Study:

  • To investigate the mechanisms underlying Endothelin-1-induced contraction in human omental resistance arteries.
  • To determine the roles of calcium influx and protein kinase C in this response.

Main Methods:

  • Isolated human omental resistance arteries were used.
  • Concentration-dependent contractions were measured.
  • Effects of calcium antagonists (nicardipine), calcium depletion, and protein kinase C inhibitor (H7) were assessed.

Main Results:

  • Endothelin-1 induced concentration-dependent contractions.
  • Nicardipine and calcium depletion partially reduced the contractile response.
  • Combined calcium depletion and H7 abolished the contraction.

Conclusions:

  • Endothelin-1-induced contraction involves both calcium-dependent and calcium-independent pathways.
  • The calcium-dependent component is mediated by dihydropyridine-sensitive channels.
  • Protein kinase C activation contributes significantly to the calcium-independent component.

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