神经干细胞移植联合腹腔注射促红细胞生成素对横断性脊髓损伤大鼠神经轴突的修复作用

目的: 探讨神经干细胞(NSCs)与促红细胞生成素(EPO)共同作用于横断性脊髓损伤大鼠后对损伤区轴突的修复作用,为临床治疗脊髓损伤提供理论依据。方法: 40只雌性成年Wistar大鼠,建立T10全横断大鼠脊髓损伤模型后,随机分为对照组、NSCs组、EPO组和联合治疗组,每组10只。术后8周采用BDA皮质脊髓束顺行追踪法和荧光金(FG)皮质脊髓束逆行追踪法评估损伤区脊髓神经轴突再生情况,同时分期采用实验性脊髓损伤运动功能BBB评分法评价大鼠后肢功能恢复情况。结果: BDA 免疫荧光染色和FG免疫荧光染色,联合治疗组可见大量被BDA-cy3红色荧光标记的再生轴突,其中部分再生轴突穿越损伤区到达远端;NSCs组仅见少量轴突再生,无神经轴突通过脊髓损伤区;EPO组偶见散在的神经纤维再生;对照组无明显的轴突再生。联合治疗组大脑皮质中可见少量被FG标记的椎体细胞及轴突发出金黄色荧光,其余3组大脑皮质中无FG标记细胞。大鼠后肢功能BBB评分,在术后1周及1周以后各时段,联合治疗组大鼠BBB评分均高于其他各组(P<0.05)。结论: 脊髓损伤后移植NSCs联合腹腔注射EPO可有效促进脊髓损伤区神经轴突的再生以及脊髓损伤大鼠后肢运动功能的恢复。     

胚胎脊髓移植兼用神经营养因子对大鼠损伤脊髓神经元的影响

目的 探讨胚胎脊髓移植并神经营养因子防止成年大鼠脊髓轴突损伤后引起神经元萎缩的作用。方法 采用大鼠腰脊髓半切洞损伤模型,将实验动物分为６组：Ａ组：单纯脊髓损伤组,Ｂ组;胚胎脊髓移植组;Ｃ组：损伤＋移植＋ＮＧＦ组;Ｄ组：损伤＋移植＋ＣＮＴＦ组;Ｅ组：损伤＋移植＋ＮＭＴ－３组;Ｆ组：损伤＋移植＋ＢＤＮＭＦ组。手术后应用行为学和电生理检查观察大鼠后肢功能恢复情况,应用Ｎｉｓｓｌ染色方法观察脊髓神经元的大     

Functional recovery following traumatic spinal cord injury mediated by a unique polymer scaffold seeded with neural stem cells and Schwann cells

Background The most important objective of transplant studies in the injured spinal cord has been to provide a favorable environment for axonal growth. Moreover, the continuing discovery of new grafts is providing new potentially interesting transplant candidates. Our purpose was to observe the morphological and functional repair effects of the co-transplantation of neural stem cell （NSC）, Schwann ceils （SCs） and poly lactide-co-glycolide acid （PLGA） on the spinal cord injury of rats.Methods A scaffold of PLGA was fabricated. NSCs and SCs were cultured, with the NSCs labeled with 5-bromodeoxyuridine, and the complex of NSC/PLGA or NSC＋SCs/PLGA were constructed. Thirty-six Wistar rats were randomly divided into three groups： group A （transplantation of PLGA）, group B （transplantation of NSC/PLGA） and group C （transplantation of NSC＋SCs/PLGA）. The 3 mm length of the right hemicord was removed under the microscope in all rats. The PLGA or the complex of PLGA-celIs were implanted into the injury site. Basso-Beattie-Bresnahan （BBB）locomotion scores, motor and somatosensory evoked potential of lower limbs were examined to learn the rehabilitation of sensory and motor function at 4 weeks, 8 weeks, 12 weeks and 24 weeks after injury. All the recovered spinal cord injury （SCI） tissues were observed with HE staining, immunohistochemistry, and transelectronmicroscopy to identify the survival, migration and differentiation of the transplanted cells and the regeneration of neural fibres at 4 weeks, 8 weeks,12 weeks and 24 weeks after injury.Results （1） From 4 weeks to 24 weeks after injury, the BBB locomotion scores of cell-transplanted groups were better than those of the non-cell-transplanted group, especially group C （P 〈0.05）. The amplitudes of the somatosensory evoked potential （SEP） and motor-evoked potential （MEP） were improved after injury in groups B and C, but the amplitude of SEP and MEP at 4 weeks was lower than that at 12 weeks and 24 weeks after injury. Compared with group B, the amplitude of SEP and MEP in group C was improved. The amplitude of SEP and MEP was not improved after injury in group A. （2） HE staining revealed the volume of the scaffold decreased and the number of cells in the scaffold increased. Newly-grown capillaries also could be seen. Immunohistochemistry staining showed the transplanted NSCs could survive and migrate until 24 weeks and they could differentiate into neurons and oligodendrocytes. The regenerated axons were observed in the scaffold-cell complex with transelectronmicroscopy. The above manifestations were more extensive in group C.Conclusions The transplanted NSC can survive and migrate in the spinal cord of rats up to 24 weeks after injury, and they can differentiate into various neural cells. Co-transplantation of cells/PLGA can promote the functional recovery of the injured spinal cord. The effect of co-transplanting NSC＋SCs/PLGA is better than transplanting NSC/PLGA alone.     

嗅神经鞘细胞移植治疗实验性脊髓损伤的研究

目的:观察移植体外培养的嗅神经鞘细胞(OEC)对大鼠脊髓左半侧横断伤的治疗作用。方法:将应用改良Nash法培养的OECs移植到成年大鼠T10脊髓左半侧横断处,8周后分别采用改良Tarlov法运动学功能评分、辣根过氧化物酶(HRP)顺行示踪、透射电镜观察、P75免疫组织化学染色及HE染色等方法,观察动物的运动功能、脊髓再生的轴突和髓鞘、OEC的存活和脊髓损伤程度。结果:8周时治疗组运动学功能评分高于对照组(P<0.05);治疗组再生轴突穿越损伤区,对照组则无再生轴突穿越;超微结构显示治疗组轴突数量多于对照组,且髓鞘的完整性强于对照组,OEC表现为星形胶质细胞样和雪旺氏细胞样两种,包绕轴突髓鞘;免疫组化染色显示移植后8周OECs仍然存活,在损伤区均匀、散在分布;损伤后8周脊髓损伤区有胶质瘢痕及空洞形成。结论:移植的嗅神经鞘细胞可促进大鼠运动功能的恢复、脊髓轴突的再生和髓鞘的重塑。     

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

目的：观察ｐＳＶＰｏＭｃａｔ微基因修饰雪旺氏细胞（ＳＣ）脊髓内移植对损伤组织的作用的影响。方法：将脊髓半横断损伤ＳＤ大鼠模型随机分为ｐＳＶＰｏＭｃａｔ微基因修饰ＳＣ移植组（Ａ组）、ＳＣ移植组（Ｂ组）、损伤对照组（Ｃ组）和正常对照组（Ｄ组）。８ ｈ 后一半动物取伤段脊髓标本测水离子含量。另一半动物采用联合行为记分（ＣＢＳ）评价其神经功能。结果：脊髓损伤（ＳＣＩ）后组织水肿,Ｎａ＋ 、Ｃａ２＋ 离子浓度升高,Ｋ＋ 、Ｍｇ２＋ 离子浓度降低,ｐＳＶＰｏＭｃａｔ微基因修饰ＳＣ脊髓内移植可显著改善这些变化,且使ＳＣＩ后神经功能有显著改善。结论：ｐＳＶＰｏＭｃａｔ微基因修饰ＳＣ脊髓内移植对ＳＣＩ具有保护作用,其机制可能与减少神经细胞离子失衡,改善细胞内环境有关。     

Human neural stem cells promote corticospinal axons regeneration and synapse reformation in injured spinal cord of rats

Background Axonal regeneration in lesioned mammalian central nervous system is abortive, and this causes permanent disabilities in individuals with spinal cord injuries. This paper studied the action of neural stem cell （NSC） in promoting corticospinal axons regeneration and synapse reformation in rats with injured spinal cord. Methods NSCs were isolated from the cortical tissue of spontaneous aborted human fetuses in accordance with the ethical request. The cells were discarded from the NSC culture to acquire NSC-conditioned medium. Sixty adult Wistar rats were randomly divided into four groups （n=15 in each）： NSC graft, NSC medium, graft control and medium control groups. Microsurgical transection of the spinal cord was performed in all the rats at the T11. The NSC graft group received stereotaxic injections of NSCs suspension into both the spinal cord stumps immediately after transection; graft control group received DMEM injection. In NSC medium group, NSC-conditioned medium was administered into the spinal cord every week; NSC culture medium was administered to the medium control group. Hindlimb motor function was assessed using the BBB Locomotor Rating Scale. Regeneration of biotin dextran amine （BDA） labeled corticospinal tract was assessed. Differentiation of NSCs and the expression of synaptophysin at the distal end of the injured spinal cord were observed under a confocal microscope. Group comparisons of behavioral data were analyzed with ANOVA. Results NSCs transplantation resulted in extensive growth of corticospinal axons and locomotor recovery in adult rats after complete spinal cord transection, the mean BBB scores reached 12.5 in NSC graft group and 2.5 in graft control group （P〈 0.05）. There was also significant difference in BBB score between the NSC medium （11.7） and medium control groups （3.7, P〈 0.05）. BDA traces regenerated fibers sprouted across the lesion site and entered the caudal part of the spinal cord. Synaptophysin expression colocalized with BDA positive axons and neurons distal to the injury site. Transplanted cells were found to migrate into the lesion, but not scatter along the route of axon grows. The cells differentiated into astrocytes or oligodendrocytes, but not into the neurons after transplantation. Furthermore, NSC medium administration did not limit the degree of axon sprouting and functional recovery of the injured rats compared to the NSC graft group. Conclusions Human embryonic neural stem cells can promote functional corticospinal axons regeneration and synapse reformation in the injured spinal cord of rats. The action is mainly through the nutritional effect of the stem cells on the spinal cord.     

骨髓基质干细胞不同移植方式治疗脊髓损伤的实验研究

目的探讨MSCs不同的移植方法对脊髓损伤修复的影响．方法90只成年大鼠，随机分为对照组、静脉移植组和腹腔移植组（每组再分为1、3、7、14、21d组），．在脊髓损伤后2d，经腹腔及静脉移植带绿色荧光的MSCs，，大鼠于移植后1、3、7、14、21d分批处死．连续冰冻切片观察细胞是否能够通过觑脑屏障并迁移到损伤部位，同时用体视学方法观察MSCs在脊髓损伤与非损伤部位的密度，用BBB评分法和爬网格法观察大鼠后肢运动功能的恢复．结果静脉移植后第1天，在损伤部位仅有少量的MSCs，而腹腔移植组未见MSCs。第3天有少量的MSCs．腹腔移植组与静脉移植相比7，14d有显著差异（P〈0．05）．21d后两种移植方法在损伤部位的细胞无差异（P〉0．05）．BBB评分，移植后7d无差异，14d后有明显差异（P〈0．05）．脊髓损伤处的细胞密度明显多于非损伤部位（P〈0．05）．结论MSCs经静脉和腹腔移植均能透过血脑屏障迁移到脊髓损伤部位并对脊髓损伤有一定的修复作用，静脉移植优于腹腔移植．     

神经干细胞移植联合促红细胞生成素对大鼠脊髓损伤的修复作用

目的:观察神经干细胞(NSCs)联合促红细胞生成素(EPO)对横断性大鼠脊髓损伤的修复作用,为临床治疗脊髓损伤提供理论依据。方法:40只成年雌性Wistar大鼠建立大鼠T10全横断脊髓损伤模型,并随机分为对照组、NSCs组、EPO组和NSCs+EPO组,每组10只。术后8周采用NF-200免疫组织化学染色和免疫荧光染色对各组大鼠损伤区脊髓神经纤维再生情况进行形态学观察;应用BBB评分评估各组大鼠后肢运动功能恢复情况。结果:组织形态学观察,对照组大鼠横断处脊髓组织残端萎缩,脊髓白质和灰质间可见大量空洞形成,未见有明显的神经纤维再生;NSCs+EPO组大鼠横断处脊髓组织残端轻度萎缩,横断区可见大量呈杂乱、无序生长的神经纤维,可见有连续性神经纤维通过脊髓横断区,脊髓白质和灰质间可见少量空洞形成。NSCs+EPO组大鼠中,FITC共轭抗神经丝蛋白抗体NF-200标记的再生神经纤维在横断区头侧大量再生,呈无序状生长,并通过损伤区到达尾侧;NSCs组大鼠可见少量神经纤维再生,未通过损伤区到达尾侧。NSCs+EPO组大鼠后肢运动功能BBB评分,术后7 d内均高于其他各组(P<0.05);NSCs组大鼠后肢运动功能BBB评分术后7 d内均高于对照组和EPO组(P<0.05)。结论:NSCs移植联合腹腔注射EPO可有效促进大鼠损伤脊髓功能的恢复、轴突的存活和再生。     

神经干细胞移植治疗大鼠脊髓损伤的活体示踪研究

目的:探索利用MR技术活体追踪干细胞的可行性及神经干细胞(NSCs)移植对大鼠脊髓损伤(SCI)后功能恢复的影响。方法:66只SD大鼠随机分为假损伤组(A组)、SCI对照组(B组)和细胞移植治疗组(C组)3组,应用已包被多聚左旋赖氨酸(PLL)的SPIO标记NSCs,对标记细胞进行普鲁士蓝染色,分别在细胞移植后第1、2、3、4、5周对各组动物进行BBB评分,细胞移植后1、3、5周行MRI检查。结果:(1)普鲁士蓝染色证实该方法标记NSCs的有效率为100%。(2)细胞移植后1~5周,B、C组动物运动功能均有不同程度恢复,但B组恢复较慢,BBB评分差异有统计学意义(P<0.05)。(3)1.5 T MRI检查见移植处在T2WI序列呈低信号改变,第3周时低信号向损伤区扩大,第5周时可在损伤区见到低信号改变。结论:MR技术可以活体追踪干细胞,NSCs移植治疗SCI有利于大鼠后肢功能的恢复。     

嗅鞘细胞移植后脊髓挫伤大鼠几种神经营养因子的表达变化

目的探讨嗅鞘细胞移植脊髓挫伤大鼠后,在其神经损伤及修复过程中三种神经营养因子（脑源性神经营养因子、神经生长因子、睫状神经营养因子）的表达变化及意义。方法体外分离培养大鼠嗅球嗅鞘细胞。40只健康SD大鼠,雌雄不拘,在移植前一星期使用NYU-撞击机,利用10g-25mm的致伤力,制作T10脊髓挫伤模型。40只脊髓挫伤大鼠随机分为OECs移植组和对照组（注射无血清培养液组）,又根据取材时间不同分为术后1天、7天、14天、21天组。动物处死前进行BBB评分评估后肢运动功能的变化。取手术部位头端和尾端0.5cm脊髓,采用免疫组织细胞化学染色检测技术检测三种神经营养因子（BDNF、CNTF、NGF）在各组脊髓中的表达变化。结果行为学评分随着损伤时间的推移呈小幅度增加,但后肢无运动功能恢复;免疫组织化学检测显示,嗅鞘细胞移植能部分改善大鼠脊髓灰质神经细胞的凋亡程度,延缓白质神经纤维的减少,促进髓鞘的修复与再生。与对照组比较,嗅鞘细胞移植治疗后脊髓组织中三种神经营养因子表达明显增加（P〈0.05）。结论嗅鞘移植能够部分改善脊髓损伤后脊髓组织的病理形态,促进脊髓组织中多种神经营养因子的表达。     

骨髓间充质干细胞移植促进大鼠损伤脊髓的功能恢复

 目的研究骨髓间充质干细胞(MSCs)移植对大鼠脊髓损伤的作用。方法将大鼠MSCs移植到大鼠脊髓损伤处,移植后评估大鼠行为学改变,免疫组织化学染色法观察BrdU标记的MSCs在脊髓损伤处存活情况,辣根过氧化物酶(HRP)逆行示踪,观察脊髓损伤处神经通路的重构建,皮层体感诱发电位(CSEP)测定脊髓损伤处神经通路传导功能的恢复。结果术后移植组评分均高于损伤组,移植组大鼠脊髓损伤区远端检测到BrdU阳性细胞,脊髓损伤近侧端检测到HRP阳性细胞,CSEP波形恢复但波幅减低,潜伏时延长。结论MSCs可在损伤区存活并分化为神经元,在损伤局部形成神经元通路,使损伤脊髓的远端和近端建立联系,神经纤维传导功能部分恢复。     

脑源性神经营养因子mRNA在胚胎脊髓修复成鼠脊髓损伤过程中的变化

观察脑源性神经营养因子（ＢＤＮＦ）在胚胎脊髓修复成鼠损伤脊髓过程中的变化。方法将妊娠１４天胚胎脊髓植入急性损伤的成体脊髓后１、３、５、７、１０、１５和３０天，用原位和斑点分子杂交技术对胚胎脊髓和正常脊髓内ＢＤＮＦｍＲＮＡ的表达变化作了定性和定量观察。结果在正常脊髓内，ＢＤＮＦｍＲＮＡ以前角运动神经元和少量胶质细胞分布为主；脊髓损伤后，杂交产物扩大到中小型神经元，同时更多的胶质细胞参与了反应；胚胎脊髓移植后，除移植物本身继续维持表达外，正常脊髓阳性反应神经元和胶质细胞数量进一步增加。损伤组原位和斑点分子杂交的反应强度明显高于正常组，而移植组的分子杂交反应又在很多时相点上显著高于损伤组。结论移植的胚胎脊髓除为自身和宿主脊髓提供神经营养外，也诱发了正常脊髓在发生过程中曾经拥有的合成机制，以增强神经营养因子表达的方式为自身的再生提供营养，同时也为移植物的发育分化提供合适的营养环境。     

Experimental study on regeneration of ascending tract after spinal cord injury with predegenerated peripheral nerve graft and NGF infusion

Objective：To explore the effects of predegenerated peripheral nerve graft （PPNG） combined with nerve growth factor （NGF） infusion on ascending sensory tract regeneration after spinal cord injury. Methods： Fifty female SD rats were randomly divided into 5 groups. Group A was treated with PPNG and NGF infusion, group B with PPNG, group C with NGF infusion, group D and group E were blank and normal control, respectively. Horseradish peroxidase-labled （HRP） tracing method was employed to evaluate the regeneration of injured nerves after 8 weeks. The extent of regeneration in and beyond the nerve graft was determined by counting the number of HRP-labeled fibers intersecting imaginary lines perpendicular to the axis of the graft and cord. For the sake of convenience, according to the relation of the PNG and spinal cord, 6 model zones were divided, including caudal of spinal cord, caudal transition zone, caudal zone in graft, rostral zone in graft, rostral transition zone and rostral of spinal cord. Results： On the transverse section of caudal zone in graft, rostral zone in graft, rostral transition zone, the fibers in group A were significantly higher than that in group B and C （P〈0.05）. Conclusion： PPNG combined with NGF may significantly promote the regeneration of ascending long tract after spinal cord injury. The regenerative fibers can penetrate the 2 graft-host interface scars.     

嗅鞘细胞移植对大鼠脊髓损伤后水通道蛋白-4的影响

目的：探索大鼠嗅鞘细胞（olfactory ensheathing cells,OECs）移植对大鼠脊髓损伤（spinal cord injurySCI）后水通道蛋白-4（AQP-4）和后肢功能的影响。方法：取Wistar大鼠150只,随机分为正常组（50只）、模型组（50只）、OECs移植组（50只）,模型组和OECs移植组用改良的Allen法制成脊髓损伤模型,造模成功后,其中OECs移植组在损伤处移植嗅鞘细胞,模型组移植DF-12培养液。于术后1、3、7、14、21、28 d进行BBB（Basso-Beattle-Bresnahan）运动功能评分,应用免疫组织化学技术检测脊髓组织AQP-4的表达,并用图像分析仪进行定量分析。结果：术后3~28 d,OECs移植组的BBB评分较模型对照组明显提高,术后第1天,模型组和OECs移植组受损脊髓灰质、白质中AQP-4的表达明显增加;第3天时均达到高峰,但OECs移植组低于模型组（P〈0.05）。第7、14、21、28天,与模型组比较,OECs移植组AQP-4表达也较低（P〈0.01）。结论：OECs移植使脊髓损伤后AQPa表达减少,这可能有利于抑制脊髓水肿、消除脊髓继发性损伤,保存残存正常脊髓组织并促进神经轴突再生,改善其肢体运动功能。     

永生化的BMSCs移植促进大鼠脊髓损伤后功能恢复

目的探讨神经生长因子(Nervegrowthfactor,NGF)和脑源性神经生长因子(BrainDerivednervegrowthfactor,BDNF)基因修饰后永生化的骨髓基质细胞(Bonemarrowstemcells,BMSCs)移植促进大鼠脊髓损伤后功能恢复。方法SD大鼠制备成脊髓损伤动物模型。随机分为损伤对照组(A组)、BMSCs移植组(B组)和NGF、BDNF基因修饰后永生化的BMSCs移植组(C组)。治疗后2、4、6周,每组动物分别进行联合行为评分(GBS)、运动诱发电位(MEP)、感觉诱发电位(SEP)检查、双下肢功能测定(爬坡试验),评价脊髓损伤功能恢复情况。结果随时间的延长,B组GBS、MEP、SEP及下肢功能明显改善,与其它组相比较,差异有显著性,P<0.05。结论NGF、BDNF基因修饰后永生化的BMSCs移植能恢复损伤脊髓的功能。     

Transplantation of human amniotic epithelial cells improves hindlimb function in rats with spinal cord injury

Background Human amniotic epithelial cells (HAECs), which have several characteristics similar to stem cells, therefore could possibly be used in cell therapy without creating legal or ethical problems. In this study, we transplanted HEACs into the injured spinal cord of rats to investigate if the cells can improve the rats’ hindlimb motor function. Methods HAECs were obtained from a piece of fresh amnion, labeled with Hoechst33342, and transplanted into the site of complete midthoracic spinal transections in adult rats. The rats (n=21) were randomly divided into three groups: Sham-operation group (n=7), cells-graft group (n=7), and PBS group (n=7). One rat of each group was killed for histological analysis at the second week after the transplantation. The other six rats of each group were killed for histological analysis after an 8-week behavioral testing. Hindlimb motor function was assessed by using the open-field BBB scoring system. Survival rate of the graft cells was observed at second and eighth weeks after the transplantation. We also detected the myelin sheath fibers around the lesions and the size of the axotomized red nucleus. A one-way ANOVA was used to compare the means among the groups. The significance level was set at P&lt;0.05.Results The graft HAECs survived for a long time (8 weeks) and integrated into the host spinal cord without immune rejection. Compared with the control group, HAECs can promote the regeneration and sprouting of the axons, improve the hindlimb motor function of the rats (BBB score: cells-graft group 9.0±0.89 vs PBS group 3.7±1.03, P&lt;0.01), and inhibit the atrophy of axotomized red nucleus [cells-graft group (526.47±148.42) &micro;m(2 )vs PBS group (473.69±164.73) &micro;m(2), P&lt;0.01]. Conclusion Transplantation of HAECs can improve the hindlimb motor function of rats with spinal cord injury.     

大鼠脊髓慢性受压后脊髓组织神经生长因子及其受体的表达

目的:观察大鼠脊髓慢性受压后脊髓组织中神经生长因子(NGF)及其受体(TrkA)表达的变化。方法:采用大鼠后路渐进性压迫的方法制作大鼠轻、中、重度脊髓压迫损伤动物模型,用免疫组化检测脊髓组织中NGF及其受体的表达的变化。结果:正常大鼠脊髓组织中的脊髓神经元和灰、白质中的胶质细胞NGF和TrkA表达较弱;脊髓受压后NGF和TrkA表达增强(P<0.05)。受压程度越重,其表达越明显,免疫反应强度与脊髓受压程度呈正相关。结论:大鼠脊髓慢性受压后,NGF及其受体表达增多,这可能对脊髓神经元的存活和保留具有重要作用。     

肋间神经移植加NGF、BDNF基因修饰的OECs修复大鼠脊髓损伤

目的探讨自体肋间神经移植加NGF、BDNF基因修饰的嗅神经鞘细胞（OECs）修复大鼠脊髓损伤（Spinal cord injury,SCI）。方法SD大鼠72只,经T11、T12间隙平面切取2mm的半侧脊髓,制成半切伤模型。动物分为A、B、C三组,每组24只。A组：将自体肋间神经纤维损伤脊髓近端前角灰质与远端前索白质桥接连接,伤侧L1、L2、L3、L4脊神经节与近端后索白质及远端后角灰质与近端后索白质桥接连接,并植入NGF、BDNF基因修饰的OECs;B组：同上述方法移植肋间神经,不植入OECs;C组：单纯脊髓损伤,脊髓半切缺损处填充明胶海棉,术后4、8周对各组动物进行神经功能检查（斜板实验检查,BBB评分）,感觉诱发电位（SEP）和运动诱发电位（MEP）检测以及组织学检查。结果术后4周时,A、B组和动物神经功能,斜板试验,BBB评分及SFP、MEP检测结果均优于C组,8周时,A组动物神经功能,斜板试验,BBB评分,SEP、MEP检测结果均优于B组和C组,镜下见移植组织存活,充填于缺损处,部分脊髓组织融合,结论肋间神经移植加NGF、BDNF基因修饰的OECs对SCI的修复有一定的疗效。     

振荡电场对脊髓损伤大鼠β-catenin蛋白表达和神经元再生的影响

目的 观察振荡电场对脊髓损伤大鼠β-catenin蛋白表达规律和神经元再生的影响.方法 60只SD大鼠采用改良Allen′s打击法建立脊髓损伤模型,随机分为对照组和实验组.实验组施加振荡电场干预,对照组只置入振荡电场刺激器而不给予干预.建模成功后分别在3、7、14 d取大鼠脊髓,行HE染色观察脊髓大体形态变化,采用Western blot和免疫组化技术检测脊髓中β-catenin蛋白表达规律,行免疫荧光检测观察神经元变化情况,并在取材前对两组大鼠行Basso-Beattle-Bresnahan(BBB)行为学评分.结果 Western blot和免疫组化结果均显示,3 d时两组脊髓灰质内β-catenin蛋白均高表达,随时间延长表达量逐渐减少,同时实验组在各时间点β-catenin蛋白表达量均高于对照组(P<0.05).神经元的表达在3~14 d时呈现递增的趋势,但实验组神经元在表达数量上明显优于对照组,同时细胞形态更加规则.两组BBB评分3、7 d时差异无统计学意义,而14 d时,实验组BBB评分明显高于对照组(P<0.05).结论 振荡电场可以提高大鼠脊髓损伤区域β-catenin蛋白表达量,并促进神经元再生,从而改善受损脊髓神经功能.     

羊膜间充质干细胞静脉移植治疗脊髓损伤的实验

目的:探讨羊膜间充质干细胞静脉移植对脊髓损伤修复的影响。方法:90只成年SD大鼠按改良Allen′s打击方法建立脊髓损伤模型,随机分为3组:对照组、假移植组和移植组,每组30只。于脊髓损伤后1周经尾静脉移植Brdu标记的羊膜间充质干细胞。3组大鼠分别于损伤后第1 d、3 d、1周及移植后1 d、3 d、1周、2周、4周采用BBB评分法对行为学进行评价。并于移植后1 d、3 d、1周、2周、4周分批处死,切片观察Brdu标记的细胞能否迁移到损伤区。结果:脊髓损伤后第1 d,3组实验动物后肢运动功能BBB评分皆为0分;细胞移植1周后移植组动物BBB评分为5.6±0.6,对照组和假移植组动物BBB评分分别为5.3±0.4和5.2±0.6;细胞移植2周后移植组、假移植组和对照组BBB评分分别为11.3±0.9、6.4±0.5和6.5±0.8;4周后3组实验动物评分分别为13.4±0.9、8.3±0.6和8.5±0.7;在损伤部位出现了Brdu标记的羊膜间充质干细胞。结论:经静脉移植的羊膜间充质干细胞能够迁移到损伤区并对脊髓损伤有一定的修复作用。