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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Effects of sorbinil, dietary myo-inositol supplementation, and insulin on resolution of neuroaxonal dystrophy in mesenteric nerves of streptozocin-induced diabetic rats.

Previous studies indicate that experimental diabetic autonomic neuropathy can be largely prevented by initiating therapy at the onset of diabetes. More clinically relevant, however, is the ability of therapy to reverse established neuropathy produced by long-standing diabetes. We have examined the effect of selected therapies on established neuroaxonal dystrophy (NAD) in ileal mesenteric nerves, a rat model of diabetic autonomic neuropathy. Groups of 3-mo-old rats were made diabetic with streptozocin (STZ-D) and allowed to survive untreated for 5 mo, at which time they were begun on sorbinil, dietary myo-inositol, and daily insulin therapies or left untreated for an additional 2 or 4 mo. Ultrastructural evidence of NAD was demonstrated in ileal mesenteric nerves of rats with untreated 5-mo STZ-D and increased with the duration of diabetes. No lesions were demonstrated in control rats of any age. myo-Inositol or sorbinil administration failed to alter the severity of diabetes as measured by its metabolic indices. Institution of sorbinil or insulin treatment at 5 mo of diabetes prevented the increase in, but did not normalize, NAD at 7 or 9 mo. Dietary myo-inositol failed to significantly reverse established NAD or prevent its initial development. Morphometric examination of ileal mesenteric nerves demonstrated a decrease in the number of axons comprising each diabetic Schwann cell unit, suggestive of chronic cycles of axonal degeneration and regeneration. This parameter, clearly abnormal by 5 mo of diabetes, was not normalized by 2 or 4 mo of insulin, sorbinil, or myo-inositol treatment.(ABSTRACT TRUNCATED AT 250 WORDS)[1]


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