中国组织工程研究 ›› 2019, Vol. 23 ›› Issue (10): 1564-1569.doi: 10.3969/j.issn.2095-4344.1625

• 细胞外基质材料 extracellular matrix materials • 上一篇    下一篇

构建Ⅰ型胶原蛋白神经导管及其在前臂正中神经损伤重建中的作用机制

申智敏,段宜强,叶 川,庄 勇   

  1. 贵州医科大学附属医院骨科,贵州省贵阳市 550004
  • 收稿日期:2018-12-05 出版日期:2019-04-08 发布日期:2019-04-08
  • 通讯作者: 段宜强,硕士生导师,副主任医师。贵州医科大学附属医院骨科,贵州省贵阳市 550004
  • 作者简介:申智敏,硕士,主治医师,主要从事骨关节、创伤骨科及数字化骨科研究。
  • 基金资助:

    贵阳市科技局资助项目(GY2018-1-80),项目负责人:申智敏

Construction of type I collagen nerve conduit and its mechanism of action in reconstruction of median nerve injury of the forearm

Shen Zhimin, Duan Yiqiang, Ye Chuan, Zhuang Yong   

  1. Department of Orthopedics, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, Guizhou Province, China
  • Received:2018-12-05 Online:2019-04-08 Published:2019-04-08
  • Contact: Duan Yiqiang, Master’s supervisor, Associate chief physician, Department of Orthopedics, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, Guizhou Province, China
  • About author:Shen Zhimin, Master, Attending physician, Department of Orthopedics, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, Guizhou Province, China

摘要:

文章快速阅读:

 

文题释义:
胶原蛋白:胶原蛋白是生物高分子,动物结缔组织中的主要成分,也是哺乳动物体内含量最多、分布最广的功能性蛋白,占蛋白质总量的25%-30%,某些生物体甚至高达80%以上。胶原蛋白因具有良好的生物相容性、可生物降解性以及生物活性,因此在食品、医药、组织工程及化妆品等领域获得广泛的应用。
正中神经损伤:正中神经由C5-8与T1神经根的纤维构成。从臂丛神经外侧索分出的外侧根,和从内侧索分出的内侧根,两者共同组成正中神经,正中神经支配前臂屈侧的大部分肌肉,以及手内桡侧半的大部分肌肉和手掌桡侧皮肤感觉,正中神经损伤较多见,少数病例与尺神经同时受伤。
 
 
背景:Ⅰ型胶原蛋白是一种高分子材料,生物相容性、细胞亲和力强,能在特定的条件下发生降解。同时,经过交联处理、干预后能获得良好的机械性能,但是在前臂正中神经损伤中的重建效果缺乏研究。
目的:探讨Ⅰ型胶原蛋白神经导管制备方法及在前臂正中神经损伤重建中的作用机制。
方法:选择由贵州医科大学附属医院医学动物实验中心提供的SD大鼠40只,随机取10只大鼠设为假手术组,剩余30只SD大鼠采用激光诱导光化学反应建立大鼠前臂正中神经损伤动物模型,建模成功后随机分为阳性对照组10只、Ⅰ型胶原蛋白组10只和自体神经组10只。假手术组常规喂养,不参与建模;阳性对照组建模成功后不采取特殊处理,自行修复;Ⅰ型胶原蛋白组采用Ⅰ型胶原蛋白神经导管进行桥接,自体神经组采用自体神经进行桥接,比较各组修复效果。

结果与结论:①倒置显微镜下可见交联前Ⅰ型胶原蛋白排列松散,呈蜂窝状不规则的孔隙及孔径,孔径大小为10-100 μm,孔隙20-200 μm,孔隙间质相对较薄,交联后Ⅰ型胶原蛋白排列致密,胶原纤维之间能形成相对规则的孔径、孔隙,大小为50-100 μm,孔隙为20-200 μm,孔隙间质增厚,空间结构发生明显的变化;②Ⅰ型胶原蛋白组与自体神经组修复后4,8,12周翻转及放置明尼苏达手灵巧度评定方法评分,均低于阳性对照组(P < 0.05),高于假手术组(P < 0.05);③Ⅰ型胶原蛋白组、自体神经组修复后12周波幅、潜伏期差异无显著性意义(P > 0.05),但均高于阳性对照组(P < 0.05);④修复12周后,阳性对照组可见神经损伤部位明显,周围可见坏死组织;自体神经组未见损伤部位,周围坏死面积减少,恢复良好;Ⅰ型胶原蛋白组甲苯胺蓝染色下未见损伤部位,恢复良好;⑤结果提示,通过自制模具能成功制备Ⅰ型胶原蛋白神经导管,将其用于大鼠前臂正中神经损伤重建中能获得良好的修复效果,有助于促进神经损伤修复。

ORCID: 0000-0003-3784-5333(段宜强)

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

关键词: Ⅰ型胶原蛋白神经导管, 前臂正中神经损伤, 自制模具, 激光诱导光化学反应, 自体神经桥接, 周围神经损伤修复

Abstract:

BACKGROUND: Type I collagen is a polymer material that has good biocompatibility and good cell affinity, and can degrade under certain conditions. It can also develop good mechanical properties after cross-linking, but it is less reported in the reconstruction of the injured median nerve of the forearm.

OBJECTIVE: To explore the preparation method of type I collagen nerve conduit and its mechanism in the reconstruction following median nerve injury in the forearm.
METHODS: A total of 40 Sprague-Dawley rats were selected from the Medical Animal Experimental Center, the Affiliated Hospital of Guizhou Medical University, 10 of which were randomly selected as sham surgery group. The remaining 30 rats were used to establish a rat model of median nerve injury in the forearm by laser-induced photochemical reaction. After successful modeling, the model rats were randomly divided into positive control group (n=10), type I collagen group (n=10) and autologous nerve group (n=10). The sham surgery group was routinely fed and did not participate in the modeling; the positive control group did not take special treatment after the successful modeling; the type I collagen group was subjected to bridging with type I collagen nerve conduit; and the autologous nerve group was subjected to bridging with autologous nerve. The repair effects were compared among groups.

RESULTS AND CONCLUSION: (1) Under the inverted microscope, the type I collagen was loosely arranged before cross-linking, and it had honeycomb-shaped irregular pores with the pore size of 10-100 μm and the porosity of 20-200 μm, and the pore interstitial was relatively thin. After cross-linking, the type I collagen was densely arranged, the collagen fibers could form relatively regular pores with the pore size of 50-100 μm and the porosity of 20-200 μm, the interstitial mass was thickened, and the spatial structure changed significantly. (2) After 4, 8 and 12 weeks of repair, the scores on the Minnesota Manual Dexterity Test in the type I collagen and autologous nerve groups were significantly lower than those in the positive control group (P < 0.05) and higher than those in the sham surgery group (P < 0.05). (3) At 12 weeks after repair, there was no significant difference in amplitude and latency between the type I collagen group and the autologous nerve group (P > 0.05), but the amplitude and latency in both groups were significantly higher than those in the positive control group (P < 0.05). (4) At 12 weeks after repair, the nerve injury site surrounded by necrotic tissues was visible in the positive control group; no injury was found in the autologous nerve group, and the surrounding necrotic area decreased, indicating good recovery; no injury was shown by toluidine blue staining in the type II collagen group, indicating good recovery. Overall, the type I collagen nerve conduit can be successfully prepared by the self-made mold, and it can be used for the reconstruction following median nerve injury in the rat forearm, helping nerve repair.

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

Key words: Collagen, Median Nerve, Inflammation, Tissue Engineering

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