Enhanced inflammatory response via activation of NF-kappaB in acute experimental diabetic neuropathy subjected to ischemia-reperfusion injury

Journal of the Neurological Sciences
Yanping WangPhillip A Low

Abstract

Reperfusion following ischemia increases ischemic fiber degeneration (IFD) in diabetic nerves compared to control normoglycemic nerves. The mechanism of this excessive susceptibility is unclear. Since reperfusion injury results in an inflammatory response, we tested the hypothesis that the diabetic state increases the inflammatory cascade. We used an animal model of unilateral ischemia-reperfusion (IR) injury to streptozotocin (STZ)-induced diabetic nerve to evaluate the density and localization of mediators of the inflammatory response using selective immunolabeling methods (for nuclear factor kappa B (NF-kappaB), intercellular adhesion molecule-1 (ICAM-1), cytokines and inflammatory cells). We studied a 1-month diabetic group and an age-matched control group (n=6 each). The right limb underwent 3 h ischemia at 35 degrees C and 7 days reperfusion. This was achieved by ligating the supplying arteries and collaterals to the right sciatic-tibial nerve for 3 h, followed by releasing the ties. Immunohistochemistry was performed on proximal sciatic and mid tibial nerves. NF-kappaB expression in diabetic sciatic endothelial cell and Schwann cell (SC) was significantly increased over that of controls subjected to identical IR injury. ...Continue Reading

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