带血管蒂周围神经在联合移植修复脊髓损伤中的作用

目的探讨带血管蒂周围神经促进胚胎脊髓修复成鼠脊髓损伤的能力。方法成鼠胸段脊髓损伤后，分别移植带血管蒂正中神经(VPN组)、孕14天胚胎脊髓(FSC组)、带血管蒂正中神经加胚胎脊髓(V+F组)。术后8周行组织学及电生理检查。结果V+F组移植神经与脊髓连接紧密，有较多新生轴突长入，雪旺氏细胞大量存活和增殖，神经丝蛋白、100％饱和硫蛋白阳性反应均明显高于VPN组(P＜0.01)；胚胎移植物与受体融合佳，体积增长速度、神经纤维和神经元数目显著高于FSC组(P＜0.01)，大部分细胞分化较好，突触较成熟；SEP检查示P1、N1波波伏期显著缩短(P＜0.01)。结论带血管蒂周围神经与胚胎脊髓联合移植，对FSC的生长发育、对损伤神经元的再生能力均有一定的促进作用。

The effect of vascular pediceled peripheral nerve tissue grafting in repair spinal cord injury

Objective:To observe the repairment effects of vascular pediceled nervous tissue on adult rat＇s spinal cord injury. Method:A 5mm cord defect of the left lateral column was made at Ti-3 vertebral level,and then the defect was grafted randomly using vascdarized peripheral nerve (Group VPN),embryonic day 14 fetal spinal cord(Group FSC) or vascular pediceled peripheral nerve and fetal spinal cord(Group V + F).8 weeks after surgery, the survival,differentiation of the grafts, and the ability of repaired host spinal cord were assessed. Result: In VPN-FSC co-graft group, peripheral nerve segment was extensively vascularized and well innervated,plenty of Schwann cells survived and proliferated. In this group, anti-NF, S-100 positives fibers were significantly greater than group VPN (P＜0.01). The fetal implant was intimately fused with the host CNS parenchyma, the volume, nerve fibers and neurons density of the fetal implant were significantly higher than Group FSC(P＜0.01). The majority of neurons in this group were well differentiated, well-developed and synapses were scattered throughout the neuropil. SEP assessments showed that the latgncy of P1 ,N1 wave was significantly decreased in this group (P＜0.01).Conclusion:The vascular pediceled peripheral nerve could prompt the development of fetal implant and support the regeneration of central injured axons to certain degrees.