Affordable Access

Publisher Website

The Mitochondrial K-ATP Channel Opener, Diazoxide, Prevents Ischemia-Reperfusion Injury in the Rabbit Spinal Cord

Authors
Journal
American Journal Of Pathology
0002-9440
Publisher
Elsevier
Publication Date
Volume
168
Issue
5
Identifiers
DOI: 10.2353/ajpath.2006.050569
Keywords
  • Cell Injury
  • Repair
  • Aging And Apoptosis
Disciplines
  • Biology
  • Design
  • Medicine

Abstract

Paraplegia resulting from ischemia is a catastrophic complication of thoracoabdominal aortic surgery. The current study was designed to investigate the effects of diazoxide (DZ) on mitochondrial structure, neurological function, DNA damage-repair, and apoptosis in spinal cord ischemia-reperfusion injury. Rabbits were subjected to 30 minutes of spinal cord ischemia and reperfusion (1 hour) with or without diazoxide ( n = 6 in each group) by clamping and releasing the infrarenal aorta. The neurological functional score was significantly improved in the DZ-treated ischemia-reperfusion injury group. Electron microscopic studies demonstrated that mitochondrial damage in the spinal cord after injury was significantly reduced by DZ. Mitochondrial superoxide and hydrogen peroxide levels were also markedly decreased in the DZ-treated injury group compared with the untreated group. DZ decreased levels of the oxidative DNA damage product 8-oxoG and increased levels of the DNA repair enzyme OGG-1. Furthermore, DZ inhibited apoptosis via caspase-dependent and -independent pathways. These studies indicate for the first time that the mitochondrial K-ATP channel opener diazoxide improves neurological function after spinal cord ischemia and reperfusion by diminishing levels of reactive oxygen species, decreasing DNA oxidative damage, and inhibiting caspase-dependent and -independent apoptotic pathways while preserving mitochondrial structure.

There are no comments yet on this publication. Be the first to share your thoughts.