Role of endothelial nitric oxide synthase and vagal activity in the endothelial protection of atorvastatin in ischemia/reperfusion injury

J Cardiovasc Pharmacol. 2013 May;61(5):391-400. doi: 10.1097/FJC.0b013e318286baf3.

Abstract

Vascular endothelial dysfunction plays a pivotal role in the development and maintenance of ischemia/reperfusion (I/R) injury. Statins, developed as lipid-lowering drugs, partially restore vagal activity and exhibit pleiotropic effects. This study was aimed at determining the effect of atorvastatin (ATV) on endothelial dysfunction in peripheral resistance arteries after I/R injury. After pretreatment with ATV (10 mg·kg·d) or its vehicle for 3 days, the superior mesenteric artery was occluded for 60 minutes and reperfusion for 90 minutes or the rats were anesthetized without being subjected to ischemia. In the ATV-treated I/R group, the increased contractions to KCl and 5-hydroxytryptamine induced by I/R were ameliorated, and attenuated endothelium-dependent relaxations to acetylcholine (ACh) were normalized. The restored relaxation to ACh was abolished by N-nitro-L-arginine methyl ester. ATV prevented the structural damage of vascular endothelial cells. Furthermore, the activities of phosphatidylinositol-3-kinase, Akt, and endothelial nitric oxide synthase were elevated in mesenteric arteries after ATV treatment. In addition, I/R-induced increment of endothelial cells apoptosis was also attenuated by ATV. Intriguingly, ATV also increased baroreflex sensitivity and serum ACh content after I/R. In conclusion, the endothelial protective effect of ATV in peripheral arteries is associated with the activated phosphatidylinositol-3-kinase/Akt/endothelial nitric oxide synthase pathway and restored vagal activity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylcholine / blood
  • Acetylcholine / pharmacology
  • Animals
  • Apoptosis / drug effects
  • Atorvastatin
  • Endothelium, Vascular / drug effects
  • Endothelium, Vascular / enzymology*
  • Endothelium, Vascular / ultrastructure
  • Enzyme Inhibitors / pharmacology
  • Heptanoic Acids / therapeutic use*
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors / therapeutic use*
  • Male
  • Mesenteric Artery, Superior / drug effects
  • NG-Nitroarginine Methyl Ester / pharmacology
  • Nitric Oxide / blood
  • Nitric Oxide Synthase Type III / antagonists & inhibitors
  • Nitric Oxide Synthase Type III / physiology*
  • Phosphatidylinositol 3-Kinase / drug effects
  • Phosphatidylinositol 3-Kinase / metabolism
  • Pyrroles / therapeutic use*
  • Rats
  • Rats, Sprague-Dawley
  • Reperfusion Injury / drug therapy
  • Reperfusion Injury / enzymology*
  • Reperfusion Injury / physiopathology
  • Vagus Nerve / physiology*
  • Vasoconstrictor Agents / pharmacology

Substances

  • Enzyme Inhibitors
  • Heptanoic Acids
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors
  • Pyrroles
  • Vasoconstrictor Agents
  • Nitric Oxide
  • Atorvastatin
  • Nitric Oxide Synthase Type III
  • Phosphatidylinositol 3-Kinase
  • Acetylcholine
  • NG-Nitroarginine Methyl Ester