Diabetes, Vol 41, Issue 5 587-591, Copyright © 1992 by American Diabetes Association
Effect of niceritrol on streptozocin-induced diabetic neuropathy in rats
N Hotta, H Kakuta, H Fukasawa, N Koh, F Sakakibara, H Komori and N Sakamoto
Third Department of Internal Medicine, Nagoya University School of Medicine, Japan.
Niceritrol, a drug with peripheral tissue vasodilatory and serum
lipid-lowering activity, was administered for 2 mo to rats with
streptozocin-induced diabetes. Physiological and biochemical studies were
subsequently conducted on rat nerve tissue. A markedly lower value of
approximately 47% in sciatic nerve blood flow (SNBF) was detected in an
untreated diabetic (DC) group than in a nondiabetic control group (CC). A
significant delay in caudal motor nerve conduction velocity (MNCV) and
significantly higher glucose, sorbitol, and fructose values were observed
in the sciatic nerve and serum lipids. In contrast, a niceritrol-treated
diabetic (DN) group had significantly higher SNBF, MNCV, and sciatic nerve
myo-inositol values and lower serum triglyceride levels than group DC. No
differences between these two groups were noted in glucose, sorbitol, and
fructose levels in the sciatic nerve, or in cholesterol and glucose in
serum. These findings suggest that niceritrol has a clear inhibitory effect
on the development of delayed MNCV in the diabetic rat, which may be due to
reduced nerve blood flow and/or decreased nerve myo-inositol levels.