海藻纤维膜片促进大鼠损伤坐骨神经的再生

背景：课题组和青岛大学高分子材料研究所合作研制的海藻纤维生物膜，具有优良的生物相容性，常被用作制备各种复合材料。目的：观察海藻纤维膜片包绕覆盖神经断端吻合口对大鼠坐骨神经损伤后再生的影响。方法：切断36只雄性Wistar大鼠右侧坐骨神经，随机分组：对照组行神经外膜端端吻合；实验组行神经外膜端端缝合，将海藻纤维膜片包绕并覆盖神经吻合口远近端各约0.5 cm，形成封闭再生室。术后观察海藻纤维膜片降解吸收规律及缝合处粘连情况，组织学切片行苏木精-伊红染色、锇酸染色、白细胞介素2及白细胞介素4免疫组织化学染色。结果与结论：术后4-6周，实验组海藻纤维膜片逐渐被降解吸收，与周围组织粘连较少，炎性细胞浸润程度较轻，纤维组织增生较少。两组术后1，7，14 d的白细胞介素2及白细胞介素4含量比较差异无显著性意义。实验组术后6周再生神经纤维分布规则且大小较为均一，其神经纤维数量、轴突大小及髓鞘厚度等指标均显著优于对照组（P 〈0.05）。表明海藻纤维膜片具有良好的生物降解性和组织相容性，其包绕覆盖坐骨神经形成的神经再生密闭室可促进大鼠损伤坐骨神经再生。

Sodium alginate film promotes the regeneration of injured sciatic nerve in rats

BACKGROUND：The sodium alginate film, jointly developed by our research team and the Institute of Polymer Material of Qingdao University, has good biocompatibility and is often used for the preparation of a variety of composite materials. OBJECTIVE： To observe the effect of sodium alginate film wrapping and covering nerve anastomotic stoma on the regeneration of injured sciatic nerve in rats. METHODS： A total of 36 male Wistar rats were randomly divided into two groups after the right sciatic nerve was cut. Control group： The nerve stump was sutured through epineurial end-to-end anastomosis; Experimental group： The nerve stump was sutured through epineurial end-to-end anastomosis, and wrapped with sodium alginate film, forming a regenerative environment for sciatic nerve regeneration. The degradation and absorption of sodium alginate film, as wel as the adhesion at suture site were observed post-operation. Interleukin-2 and interleukin-4 positive expression was detected with immunohistochemistry method. The histological sections were also detected with hematoxylin-eosin staining and osmium tetroxide staining. RESULTS AND CONCLUSION：At 4-6 weeks post-operation, sodium alginate film was mostly degraded and absorbed in the experimental group. The experimental group rats had less local adhesion, slighter infiltration of inflammatory cels, and fewer fiber tissue hyperplasia than control group rats. The contents of interleukin-2 and interleukin-4 were almost the same between the control and experimental groups at 1, 7, 14 days post-operation. At 6 weeks, the regenerated nerve fibers were distributed evenly with uniform shape, the number of nerve fibers, axons and myelin sheath were significantly better than the control group （P 〈 0.05）. Sodium alginate film has good biological degradability and histocompatibility and plays an important role in promoting sciatic nerve regeneration.