中国修复重建外科杂志

中国修复重建外科杂志

肌外膜导管中细胞对周围神经再生影响的实验研究

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目的 探讨小鼠腹外斜肌外膜制备的肌外膜导管(epimysium conduit,EMC)中的细胞成分对坐骨神经再生影响。 方法 取 8 周龄雄性 C57BL/6J 增强绿色荧光蛋白(enhanced green fluorescent protein,EGFP)小鼠的腹外斜肌外膜,修剪成 5 mm×3 mm,制备成管状(即 EMC)。取部分肌外膜采用不同照射剂量(0、15、20、25、30、35 Gy)进行细胞迁移抑制处理,并计数迁移细胞,选择迁移细胞数最少的肌外膜制备 EMC;另取部分肌外膜行脱细胞处理,常规 HE 和 Masson 染色鉴定脱细胞效果后制备 EMC。取 24 只 C57BL/6J 野生型小鼠制备右后肢 3 mm 长坐骨神经缺损模型后,随机分为 3 组(n=8),分别采用 EMC(A 组)、经细胞迁移抑制处理后的 EMC(B 组)、脱细胞处理后的 EMC(C 组)修复缺损。术后 16 周取再生神经中段行大体、甲苯胺蓝染色、免疫荧光染色以及透射电镜观察。 结果 肌外膜细胞迁移抑制观察示,15 d 时随照射剂量增大,细胞迁移数逐渐减少;除 30 Gy 组与 35 Gy 组间比较差异无统计学意义(P>0.05)外,其余各组间比较,差异均有统计学意义(P<0.05)。选用经 35 Gy 照射剂量处理后的肌外膜进行体内实验。肌外膜脱细胞处理后均未见细胞核,且可缝合成导管状,制备 EMC。术后 16 周各组 EMC 中神经均再通,A 组修复后的坐骨神经最粗,B 组次之,C 组最细;免疫荧光染色可见 A 组 EMC 中 EGFP 细胞包绕再生轴突;甲苯胺蓝及透射电镜观察,A 组再生神经轴突数及再生有髓神经鞘厚度显著优于 B、C 组(P<0.05),B、C 组间比较差异无统计学意义(P>0.05)。 结论 EMC 中的细胞成分参与并促进了小鼠坐骨神经的再生。

Objective To investigate the effect of cells in the epimysium conduit (EMC) on the regeneration of sciatic nerve of mice. Methods The epimysium of the 8-week-old male C57BL/6J enhanced green fluorescent protein (EGFP) mouse was trimmed to a size of 5 mm×3 mm, and prepared in a tubular shape (ie, EMC). Some epimysia were treated with different irradiation doses (0, 15, 20, 25, 30, 35 Gy) to inhibit cells migration. Then the number of migrating cells were counted, and the epimysia with the least migrating cells were selected to prepare EMC. Some epimysia were subjected to decellularization treatment and prepared EMC. HE and Masson staining were used to identify the decellularization effect. Twenty-four C57BL/6J wild-type mice were used to prepare a 3-mm-long sciatic nerve defect of right hind limb model and randomly divided into 3 groups (n=8). EMC (group A), EMC after cell migration inhibition treatment (group B), and decellularized EMC (group C) were used to repair defects. At 16 weeks after operation, the midline of the regenerating nerve was taken for gross, toluidine blue staining, immunofluorescence staining, and transmission electron microscopy. Results At 15 days, the number of migrating cells gradually decreased with the increase of irradiation dose. There was no significant difference between 30 Gy group and 35 Gy group (P>0.05); there were significant differences between the other groups (P<0.05). The epimysium after treatment with 35 Gy irradiation dose was selected for thein vivo experiment. After the decellularization of the epimysium, no nucleus was found in the epimysium and the epimysium could be sutured to prepare EMC. At 16 weeks after operation, the nerves in all groups were recanalized. The sciatic nerve was the thickest in group A, followed by group B, and the finest in group C. Immunofluorescence staining showed that the EGFP cells in group A were surrounded by regenerated axons. Toluidine blue staining and transmission electron microscopy observation showed that the number of regenerated axons and the thickness of regenerated myelin sheath in group A were significantly better than those in groups B and C (P<0.05). There was no significant difference between groups B and C (P>0.05). Conclusion The cellular components of the epimysium participate in and promote the regeneration of the sciatic nerve in mice.

关键词: 肌外膜导管; 神经再生; 细胞迁移抑制; 脱细胞

Key words: Epimysium conduit; nerve regeneration; cell migration inhibition; decellularization

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