NGF and sciatic neuropathy: Deng and Zhang [9] investigated the effects of Qitengtongluoyin on protein expression of NGF and neuropeptide substance P (SP) in sciatic nerves of STZ-induced diabetic multiple neuropathy rats, and proved that Qitengtongluoyin can prevent and treat sciatic neuropathy in STZ-induced diabetic multiple neuropathy rats, probably via promoting the expression of NGF and SP protein.