Abstract
This study examined the effects of 4-methylcatechol (4-MC), a nonamine catechol compound, on the neuropathic process of streptozotocin (STZ)-induced diabetic rats. 4-MC is one of the potent stimulators of nerve growth factor (NGF) synthesis at the cellular level and in cultured sciatic nerve segments of rats. Diabetic rats showed a statistically significant fall in sciatic motor nerve conduction velocity (MNCV) and a significantly reduced NGF content in the sciatic nerve (38.5 ± 2.8% of control, P < 0.01) during the experimental period of 4 weeks. 4-MC treatment of the diabetic rats for 4 weeks starting from the STZ injection elevated the NGF content (140% of untreated diabetic rats, P < 0.05) and prevented the reduction in MNCV, but no effect on high blood glucose levels was seen. These findings suggest that decreased NGF levels in the sciatic nerve of the experimental diabetic rat may be involved in the development of the diabetic neuropathic process and that 4-MC, which can elevate endogenous NGF levels in vivo, may compensate for the inhibitory effect of STZ on the NGF level in progressive diabetic neuropathy.
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