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Nerve glucose, fructose, sorbitol, myo-inositol, and fiber degeneration and regeneration in diabetic neuropathy.

Dr. Alan Shih
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Dyck PJ, Zimmerman BR, Vilen TH, Minnerath SR, Karnes JL, Yao JK, Poduslo JF.

We measured the alcohol sugars in sural nerves from 11 controls, 21 conventionally treated patients with diabetes and neuropathy, and 4 diabetics without neuropathy. The results were related to metabolic control and to clinical, neuropathological, and morphometric abnormalities in the nerves. The mean endoneurial glucose, fructose, and sorbitol values were higher in diabetic patients than in controls. Linear regression analysis revealed that nerve sorbitol content in the diabetics was inversely related to the number of myelinated fibers (P = 0.003). Mean nerve levels of myo-inositol were not decreased in the diabetic patients, with or without neuropathy, and were not associated with any of the neuropathological end points of diabetes. Our results indicate that myo-inositol deficiency is not part of the pathogenesis of human diabetic neuropathy, as had been hypothesized. Other accumulated alcohol sugars, however, were increased in diabetes and were associated with the severity of neuropathy. On repeat biopsy, six diabetics, treated for a year with the aldose reductase inhibitor sorbinil, had decreased endoneurial levels of sorbitol (P less than 0.01) and fructose (0.05 less than P less than 0.1), but unchanged levels of myo-inositol.

N Engl J Med. 1988 Sep 1;319(9):542-8.