Ischemia-reperfusion injury of peripheral nerve in experimental diabetic neuropathy

Yanping Wang, James D. Schmelzer, Ann Schmeichel, Haruyasu Iida, Phillip A. Low

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

The pathogenesis of human diabetic neuropathy likely involves the interplay of hyperglycemia, ischemia, and oxidative stress. Mild-moderate ischemia-reperfusion to streptozotocin (STZ)-induced diabetes results in florid fiber degeneration in diabetic but not in normal nerves. Uncertainty exists as to the influence of duration of diabetes on this susceptibility. We therefore studied diabetic tibial and sciatic nerves using a rat ischemia-reperfusion (IR) model after 1 month and 4 months of diabetes utilizing electrophysiological, behavioral, and neuropathological methods. Electrophysiological abnormalities were present in 1-month diabetic rats (D) and persisted over 4 months. Behavioral scores were decreased markedly at 4 months (p<0.05). Endoneurial edema and ischemia fiber degeneration (IFD) were observed at both the 1-month (p<0.01 and p<0.001) and 4-month (p<0.001) durations in diabetic nerves, whereas only mild or no damage was observed in age-matched control nerves. These findings demonstrate that STZ-induced diabetes exacerbates the morphological and electrophysiological pathology in peripheral nerve to IR injury both in the early timepoint of 1 month and late timepoint of 4 months, although there was a gradation of injury, which is more severe at the later timepoint. Reperfusion exaggerated morphological pathology in 1-month STZ-induced diabetic peripheral nerve.

Original languageEnglish (US)
Pages (from-to)101-107
Number of pages7
JournalJournal of the neurological sciences
Volume227
Issue number1
DOIs
StatePublished - Dec 15 2004

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Keywords

  • Experimental diabetic neuropathy (EDN)
  • Ischemia
  • Peripheral nerve
  • Reperfusion

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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