Galanin and its receptor system promote the repair of injured sciatic nerves in diabetic rats  

作　　者：Xiao- feng Xu Dan-dan Zhang Jin-chi Liao Li Xiao Qing Wang Wei Qiu 

机构地区：[1]The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, Guangdong Province, China [2]South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, Guangdong Province, China

出　　处：《Neural Regeneration Research》2016年第9期1517-1526,共10页中国神经再生研究（英文版）

基　　金：supported by the National Natural Science Foundation of China,No.31440047;the Natural Science Foundation of Guangdong Province in China,No.2015A030310152

摘　　要：Various studies have reported that galanin can promote axonal regeneration of dorsal root ganglion neurons in vitro and inhibit neuropathic pain. However, little is known about its effects on diabetic peripheral neuropathy, and in vivo experimental data are lacking. We hypothesized that repeated applications of exogenous galanin over an extended time frame may also repair nerve damage in diabetic peripheral neuropathy, and relieve pain in vivo. We found that neuropathic pain occurred in streptozotocin-induced diabetic rats and was more severe after sciatic nerve pinch injury at 14 and 28 days than in diabetic sham-operated rats. Treatment with exogenous galanin alleviated the neuropathic pain and promoted sciatic nerve regeneration more effectively in diabetic rats than in non-diabetic rats after sciatic nerve pinch injury. This was accompanied by changes in the levels of endogenous galanin, and its receptors galanin receptor 1 and galanin receptor 2 in the dorsal root ganglia and the spinal dorsal horn when compared with nerve pinch normal rats. Our results show that application of exogenous galanin daily for 28 days can promote the regeneration of injured sciatic nerves, and alleviate neuropathic pain in diabetic rats.Various studies have reported that galanin can promote axonal regeneration of dorsal root ganglion neurons in vitro and inhibit neuropathic pain. However, little is known about its effects on diabetic peripheral neuropathy, and in vivo experimental data are lacking. We hypothesized that repeated applications of exogenous galanin over an extended time frame may also repair nerve damage in diabetic peripheral neuropathy, and relieve pain in vivo. We found that neuropathic pain occurred in streptozotocin-induced diabetic rats and was more severe after sciatic nerve pinch injury at 14 and 28 days than in diabetic sham-operated rats. Treatment with exogenous galanin alleviated the neuropathic pain and promoted sciatic nerve regeneration more effectively in diabetic rats than in non-diabetic rats after sciatic nerve pinch injury. This was accompanied by changes in the levels of endogenous galanin, and its receptors galanin receptor 1 and galanin receptor 2 in the dorsal root ganglia and the spinal dorsal horn when compared with nerve pinch normal rats. Our results show that application of exogenous galanin daily for 28 days can promote the regeneration of injured sciatic nerves, and alleviate neuropathic pain in diabetic rats.

关 键 词：nerve regeneration peripheral nerve injury DIABETES sciatic nerve GALANIN galanin receptor 1 galanin receptor 2 neuropathicpain dorsal root ganglion spinal dorsal horn neural regeneration 

分 类 号：R587.2[医药卫生—内分泌] R745[医药卫生—内科学]