The effect of microgene pSVPoMcat to modify Schwann cell on GAP -43 expression after spinal cord injury in adult rats

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pSVPoMCAT微基因修饰雪旺氏细胞移植治疗实验性脊髓损伤的酶及免疫组化评价

Forthefirsttime，weconstructedmicrogeneforbaseproteinofmyelinsheath（transientlycalledpSVPoMcat）．Usingcationliposome，pSVPoMcatwasinducedintohighlypurifiedschwanncells（SC）．ItwasprovedthatmicrogenepSVPoMcatimplantedtomodifySCcansurviveforalongtimeafterimplantationtoinjuredspinalcord．SCcanpromotemovementfunctionrecoveryafterspinalcordinjury（SCI），butthetherapeuticeffectcannotbeconfirmedmorphologically犤１－２犦．So，theauthorperformedspecificmorphologicalstudyonaxoninthespinalwhi…     

Effect of Microgene pSVPoMcat Implantation to Modify Genetically Schwann Cells on Central Conduction Function after Spinal Cord Injury

We have tested cortical somatasensory evoked potentials (CSEP)after spinal cord injury treated by pSVPoMcat modified Schwann cells implantation and the change of combined behavior score introduced by Gale et al.to explain its effect on central condution after experimental SCI.1 Materials and Methods1.1 SCI model and implantation process Adult SD rats( weighing 200－230g,with no gender regarded,provided by the animal Center of the West China University of medical)were made hemi－transe…     

微基因修饰雪旺氏细胞移植对脊髓损伤中枢传导功能的作用

Objective To approach the effect of microgene pSVPoMcat to modify genetically Schwann cells (SC) on central conduction functionafter spinal cord injury (SCI) . Method Experimental animals were divided into three groups: the group of microgene pSVPoMcat implanted to genetically modify SC (group A), SC implanted group (group B), and the control group (group C). The cortical somatasensory evoked potentials (CESP) and combined behavioral score (CBS) were continuous monitored from operation second week to twelfth week Result The result showed that the peak latency and peak amplitudes of group A, B have a recovery tendency and it was constant with CBS. Conclusion We concluded that the microgene pSVPoMcat to modify genetically Sc may play a promotion role in recovery of central conduction function after SCI.     

pSVPoMCAT微基因修饰雪旺氏细胞移植治疗实验性脊髓损伤的酶及免疫组化评价

Genetherapyofspinalcordinjury（SCI）remainsintheexper－imentalstage．Now，neurotrophicfactortomodifySchwanncell（SC）orfibroblastsareimplantedintoSCIregiontoobservetheregenera－tionsofaxons犤１犦．WefirstbuildPo－５＇－flankinginducedmicrogeneforbasicproteinofmyelinsheathwhichistransientlynamedaspSVPoMcat．ThepSVPoMcatgenewasintroducedintoSCthroughcationliposome．ItwasprovedthatpSVPoMcatcouldenhancefunc－tionofSCandelongateitssurvivalperiodinvitro犤２犦．pSVPoMcatwasimplantedintoS…     

应用MRI和电镜观察pSVPoMact微基因修饰雪氏细胞移植对损伤脊髓的修复作用

Objective To approach the effect of microgene pSVPoMcat modified Schwann cell (SC) on the regeneration and repair of injured spinal cord.Method Spinal cord hemi－ transection models were made with the cutting method in healthy SD rats. Microgene pSVPoMcat modified SC(group A),highly purified SC(group B),and glutin sponge (control group C)were randomly implanted into the cut. After 3 month living ,the host rats were scanned by MRI, and observed under EM. Result Spinal signals at the injury region nearly recovered to normal in group A.No recovery was found in group B.Malacosis was found in group C.TEM findings: regeneration of large number of myelinated and nonmyelinated axons and SC proliferation in group A, myelinated axon regeneration and SC necrosis in group B, non myelinated and nonmyelinated axon in group C.Conclusion Implantation of microgene pSVPoMcat modified SC could promote the repair of injured spinal cord.     

pSVPoMcat微基因修饰雪旺细胞脊髓内移植对损伤脊髓细胞的保护作用

Objective To study the protective effects of the intracord transplantation of microgene pSVPoMcat－ genetically－ modified Schwann cells (MSCs)on spinal cord injury (SCI).Method Rats with semi－ division(SD) of the spinal cord was divided into 4 groups.Group S consisted of the rats with SD treated with the transplantation of MSCs, Group B of the rats with SD treated with the transplantation of SCs without genetic modification,Group C of the rats with SD without treatment and Group D was the normal control. 8 hours after operation,the half of the rats of each group were killed and the injured segment of the spinal cord was resected to be examined with atomic absorption spectrophotometry . Another half of the rats of all the groups were examined with neurological function tests to have a combined behavioral score (CBS).Result There was a significant increase of water content and Na＋ and Ca2＋ ions and a decrease of K＋ and Mg 2＋ ions in the injured cord segment of Group C and a statistically significant recovery was observed in Group A. The intracord transplantation of pSVPoMcat genetically modidied SCs improved the neurological outcome of spinal cord injury.Conclusion Our findings indicate that intracord transplantation of pSVPoMcat－ genetically－ modified－ Schwanncells exerts protective effects on the injured segment of the spinal cord through the improvement of the internal ion environment of the spinal cord.     

pSVPoMcat微基因修饰雪旺细胞脊髓内移植对操作脊髓再生的影响

Objective In order to observe the role of genetically modified Schwann cell (SC) with pSVPoMcat in the regeneration of injured spinal cord.Method The cells were implanted into the spinal cord.Ninety SD rats were used to establish a model of hemi- transection of spinal cord at the level of T8,and were divided into three groups,randomly, that is,pSVPoMcat modified SC implantation(Group A), SC implantation(Group B),and without cell implantation as control(Group C).After three months the presence of axonal regeneration of the injured spinal cord was examined by means of horseradish peroxidase(HRP)retrograde labeling technique and stereography.Result The results indicated that HRP labeled cells in Group A and B could be found in the superior region of injured spinal cord and the brain stem such as the red nuclei and oculomotor nuclei. The density of ventral horn neurons of the spinal cord and the number of myelinated axons in 100 μ m of the white matter was A >B >C group.Conclusion In brief,the pSVPoMcat modified SC intraspinal implantation could promote regeneration of the injured spinal cord.     

氦氖激光照射对大鼠神经损伤后脊髓内生长相关蛋白表 …

目的　研究 10mW氦氖 (He Ne)激光照射对大鼠神经损伤后脊髓生长相关蛋白 (growthassociatedprotein ,GAP 43 )表达的影响。 方法　将 96只SD大鼠制成坐骨神经损伤模型 ,用免疫组化方法观察脊髓内GAP 43表达的变化。结果　 1周内激光照射组和对照组无明显差异。 2、4周时照射组脊髓内GAP 43表达明显高于对照组。 8周时激光照射组脊髓内GAP 43表达下降。结论　激光照射可引起损伤神经GAP 43表达的变化 ,有促进完成神经再生的作用。     

实验性大脑皮层梗死后中枢神经系统相关部位的神经可塑性

目的 :探讨实验性大脑皮层梗塞后同侧纹状体、丘脑及对侧脊髓前角的神经结构可塑性。方法 :采用易卒中型肾血管性高血压大鼠制作右侧大脑中动脉皮层支闭塞模型 ,分别于术后第 1周、2周、3周和 4周 ,取鼠脑行免疫组化检查 ,检测大鼠不同时点纹状体、丘脑腹后外侧核及对侧脊髓前角的微管相关蛋白 2 (MAP 2 )、突触生长素(SYN)和生长相关蛋白 (GAP 43)表达的变化。结果 :大脑皮层梗塞后第 1周 ,同侧纹状体、丘脑腹后外侧核和对侧脊髓前角GAP 43阳性信号开始增加 ,第 2周达到高峰 ,之后增加幅度逐渐减弱 ;这些部位SYN阳性信号第 1周较对照组高 ,至第 2周恢复正常 ,第 3周和第 4周逐渐降低 ,且显著低于对照组 ;脑皮层梗塞后第 2周 ,同侧纹状体和丘脑腹后外侧核MAP 2阳性细胞数开始减少 ,至 3周、4周显著低于对照组。结论 :大脑皮层梗死后早期远离梗塞灶的相关神经组织有明显的可塑性 ,后期神经细胞继发性死亡且可塑减缓