中国神经再生研究(英文版) ›› 2015, Vol. 10 ›› Issue (8): 1324-1331.doi: 10.4103/1673-5374.162770

• 原著:周围神经损伤修复保护与再生 • 上一篇    下一篇

拮抗瞬间电压感受器阳离子通道V1可促进损伤坐骨神经再生

  

  • 收稿日期:2015-07-04 出版日期:2015-08-24 发布日期:2015-08-24
  • 基金资助:

    国家自然科学基金(81171178),山西省自然科学基金(2012011036-3),山西省归国人员科研资助项目(2013011054-2)

Blockade of transient receptor potential cation channel subfamily V member 1 promotes regeneration after sciatic nerve injury

Fei Ren, Hong Zhang, Chao Qi, Mei-ling Gao, Hong Wang, Xia-qing Li   

  1. Department of Pathophysiology, School of Basic Medical Sciences, Shanxi Medical University, Taiyuan, Shanxi Province, China
  • Received:2015-07-04 Online:2015-08-24 Published:2015-08-24
  • Contact: Xia-qing Li, M.D., xqli2013@126.com.
  • Supported by:

    This study was supported by the National Natural Science Foundation of China, No. 81171178; the Natural Science Foundation of Shanxi Province in China, No. 2012011036-3; Scientific Research Foundation of Shanxi Province of China for the Returned Overseas Chinese Scholars, No. 2013011054-2.

摘要:

瞬间电压感受器阳离子通道V1(transient receptor potential cation channel, subfamily V, member 1,TRPV1),主要参与痛觉的产生,又被称为伤害性感应器。然而,周围神经损伤后TRPV1是否被激活、激活的TRPV1是否会对损伤后的神经再生产生影响目前研究甚少。实验采用免疫荧光染色法检测发现,坐骨神经压榨性损伤大鼠,损伤远端发生Wallerian变性,随后由损伤近端逐渐开始出现神经突起及许旺细胞的再生。但损伤前60 min于同侧足掌皮下注射辣椒素受体拮抗剂AMG517(300 ?g/kg)后,损伤近端(距损伤中心0.3 cm)、损伤中心及损伤远端(距损伤中心0.3 cm)部位有髓和无髓神经簇再生的数量明显多于未用药组,尤以损伤后2周时表现更为明显。单纯坐骨神经损伤后1,2周,损伤侧坐骨神经TRPV1表达以及背根神经节TRPV1阳性神经细胞的百分比均明显增加,与此同时,损伤前同侧足掌注射AMG517阻断TRPV1后,此增加趋势可受到抑制。结果说明坐骨神经压榨性损伤时TRPV1可能过度表达或激活,阻断TRPV1可以加快或促进损伤坐骨神经的再生。

关键词: 神经再生, 周围神经再生, 瞬间电压感受器阳离子通道V1, 辣椒素受体, 香草素受体, 伤害性感受器, TRPV1拮抗剂, 神经压榨性损伤, Wallerian变性, 轴突, 神经突起, 国家自然科学基金

Abstract:

The transient receptor potential cation channel subfamily V member 1 (TRPV1) provides the sensation of pain (nociception). However, it remains unknown whether TRPV1 is activated after peripheral nerve injury, or whether activation of TRPV1 affects neural regeneration. In the present study, we established rat models of unilateral sciatic nerve crush injury, with or without pretreatment with AMG517 (300 mg/kg), a TRPV1 antagonist, injected subcutaneously into the ipsilateral paw 60 minutes before injury. At 1 and 2 weeks after injury, we performed immunofluorescence staining of the sciatic nerve at the center of injury, at 0.3 cm proximal and distal to the injury site, and in the dorsal root ganglia. Our results showed that Wallerian degeneration occurred distal to the injury site, and neurite outgrowth and Schwann cell regeneration occurred proximal to the injury. The number of regenerating myelinated and unmyelinated nerve clusters was greater in the AMG517-pretreated rats than in the vehicle-treated group, most notably 2 weeks after injury. TRPV1 expression in the injured sciatic nerve and ipsilateral dorsal root ganglia was markedly greater than on the contralateral side. Pretreatment with AMG517 blocked this effect. These data indicate that TRPV1 is activated or overexpressed after sciatic nerve crush injury, and that blockade of TRPV1 may accelerate regeneration of the injured sciatic nerve.

Key words: nerve regeneration, peripheral nerve regeneration, transient receptor potential cation channel subfamily V member 1, capsaicin receptor, vanilloid receptor, TRPV1 antagonist, nociceptor, nerve crush injury, Wallerian degeneration, axon, NSFC grant, neurites, neural regeneration