上海交通大学学报(医学版)

• 论著(基础研究) • 上一篇    下一篇

大鼠胫神经瘤移置模型的建立及其神经系统中神经营养素的表达变化

田金阁,于婷婷,张昕,杜冬萍   

  1. 上海交通大学附属第六人民医院疼痛科,上海 200233
  • 出版日期:2017-01-28 发布日期:2017-01-19
  • 通讯作者: 杜冬萍,电子信箱:dudp@sjtu.edu.cn。
  • 作者简介:田金阁(1989—),女,硕士生;电子信箱:tianjinge@163.com。
  • 基金资助:

    国家自然科学基金(81370933,81400803,81672237)

Construction of a rat tibial neuroma transposition model and changes of neurotrophin expressions in the nervous system

TIAN Jin-ge, YU Ting-ting, ZHANG Xin, DU Dong-ping   

  1. Pain Management Center, Shanghai Sixth People’s Hospital, Shanghai Jiao Tong University, Shanghai 200233, China
  • Online:2017-01-28 Published:2017-01-19
  • Supported by:

    National Natural Science Foundation of China,881370933,81400803,81672237

摘要:

目的 ·建立大鼠胫神经瘤移置(TNT)模型,观察损伤神经水平及背根神经节(DRG)和脊髓内神经营养素(NTs)家族中神经生长因子(NGF)和脑源性神经营养因子(BDNF)的表达变化,初步探讨外周神经损伤后NTs表达变化对神经瘤形成和疼痛相关行为学的影响。方法 ·将大鼠胫神经横断并经皮下隧道移置在外踝上方皮下,建立TNT模型。于术后不同时间点应用Von Frey纤维丝测量神经瘤压痛和足底机械刺激反应阈值(PWT);实验终点处死大鼠,取损伤胫神经断端,Neurofilament-200荧光标记神经纤维观察胫神经断端神经瘤形成情况。再次造模,并分别于第7、21、42、49日处死大鼠,取损伤侧胫神经、DRG和脊髓,ELISA检测胫神经和DRG中NGF和BDNF的表达变化,Western blotting检测脊髓中NGF和BDNF的表达变化。结果 ·术后第7日,神经瘤压痛反应频率和评分显著升高;术后第3日,足底外侧缘PWT开始降低且神经瘤压痛和足底外侧机械痛持续整个实验周期;但足底中部PWT无明显变化。胫神经免疫荧光染色表明损伤神经断端神经瘤形成。ELISA检测结果显示:胫神经内NGF表达增加,BDNF在术后第7、21日表达升高后逐渐降至正常水平;DRG内NGF在术后第7、21日表达升高后逐渐降至正常水平,BDNF在术后第7日表达升高后逐渐降至正常水平。在脊髓水平,在术后不同时间点NGF和BDNF的表达均升高并持续整个实验周期。结论 · TNT可导致大鼠损伤神经断端神经瘤形成及神经病理性疼痛(神经瘤压痛和足底机械痛觉高敏),其发生和发展过程可能与NGF和BDNF有关。

关键词: 胫神经瘤移置模型, 神经瘤压痛, 神经营养素, 神经生长因子, 脑源性神经营养因子

Abstract:

Objective · To construct a rat tibial neuroma transposition (TNT) model, observe changes in expressions of neurotrophins (NTs) family [nerve growth factor (NGF) and brain derived neurotrophic factor (BDNF)] in injured nerves, dorsal root ganglions (DRGs), and spinal cord, and investigate the effects of changes in NTs expression after peripheral nerve injury on the formation of neuroma and pain-related behavior. Methods · TNT model was built by transecting the tibial nerve and transposing it in upper lateral ankle subcutis through a transcutaneous channel. Neuroma pain and plantar mechanical paw withdrawal threshold (PWT) were measured with Von Frey filaments at different time points after TNT surgery. Rats were sacrificed and injured tibial nerves were harvested at the end of the experiment. The formation of neuroma at the broken end of tibial nerves was observed by fluorescent labeling of nerve fibers with Neurofilament-20. Animal models were built again. Rats were sacrificed and tibial nerves, DRGs, and spinal cords at injured side were collected on days 7, 21, 42 and 49. Changes in NGF and BDNF expressions in tibial nerves and DRGs were measured with ELISA kit. Changes in NGF and BDNF expressions in spinal cords were detected with Western blotting. Results · The rate and score of neuroma pain at day 7 after surgery significantly increased. The PWT level in lateral plantar skin started to decrease at day 3 after surgery. The neuroma pain and mechanical pain in lateral plantar skin lasted the whole experimental period, while the PWT level in middle plantar skin has no significant changes. The immunofluorescence staining revealed neuroma was formed at the broken end of injured nerves. ELISA results showed that in tibial nerves the NGF expression was increased, while the BDNF expression was increased at days 7 and 21 after surgery and then gradually decreased to normal level. The NGF expression in DRG was increased at days 7 and 21 and then gradually decreased to normal level, while the BDNF expression was increased at day 7 after surgery and gradually decreased to normal level. NGF and BDNF expressions in spinal cords were increased at different time points after surgery and lasted the whole experimental period. Conclusion · TNT can cause the formation of neuroma at the broken end of nerves and neuropathic pain in rats (neuroma pain and mechanical allodynia). NGF and BDNF may be associated with the occurrence and development of neuroma and neuropathic pain.

Key words: tibial neuroma transposition model, neuroma pain, neurotrophins, nerve growth factor, brain derived neurotrophic factor