黄芩苷防止肺纤维化大鼠肺内结缔组织生长因子的上调

为探讨黄芩苷(baicalin,Bai)防止肺纤维化的机制,本研究观察了Bai对肺纤维化大鼠肺内结缔组织生长因子(connective tissue growth factor,CTGF)上调的影响。将雄性Sprague-Dawley(SD)大鼠随机分为4组:生理盐水(normal saline,NS)+NS组(气管内滴注NS,随后每天腹腔注射NS一次)、NS+Bai组(气管内滴注NS,随后每天腹腔注射Bai一次)、博莱霉素(bleomycin,BLM)+NS组(气管内滴注BLM,随后每天腹腔注射NS一次)和BLM+Bai组(气管内滴注BLM,随后每天腹腔注射Bai一次)。Bai的剂量分别为每天6、12.5或50mg/kg。各组于气管内一次性滴注BLM或NS后第28天处死动物,取肺组织样本。采用氯胺-T法检测肺组织羟脯氨酸含量(反映肺纤维化程度的指标),用RT-PCR和免疫组织化学方法检测肺CTGF的表达。结果显示,BLM+NS组大鼠肺羟脯氨酸含量、CTGF蛋白及mRNA水平均明显高于NS+NS组大鼠(均P0.01),提示BLM诱导了大鼠的肺纤维化,且纤维化肺内出现CTGF表达的上调。BLM+Bai组大鼠连续28d每天腹腔注射6、12.5或50mg/kgBai后,BLM所致的肺纤维化明显减轻,同时肺CTGF表达的上调也得到明显抑制。以上结果提示,Bai可防止肺纤维化大鼠肺内CTGF表达的上调,这可能是其防止肺纤维化形成的作用机制之一。     

反复铜绿假单胞菌感染诱导大鼠慢性阻塞性肺疾病模型探讨

目的探讨反复铜绿假单胞菌(PA)感染能否诱导大鼠产生慢性阻塞性肺疾病(COPD)的病理生理及病理学改变。方法将120只Wistar大鼠随机分为铜绿假单胞菌感染组(PA组)和对照组(NS组)。PA组通过气管穿刺,多次注入一定剂量铜绿假单胞菌菌液,建立大鼠慢性肺部感染模型,测定大鼠动脉血气,观察肺组织病理改变,测量气管壁厚度和血管壁厚度。结果自感染第4周开始,PA组大鼠体重较NS组显著减轻(P<0.05);自第12周开始,PA组大鼠血气PaO2显著低于NS组(0.01相似文献   

Orexin受体1对摄食条件反射的调控研究

目的:观察Orexin受体1对摄食条件反射的调控研究。方法:将40只大鼠随机分为四组,分别为NS/NS组,SB/SB组,NS/SB组,SB/NS组,每组10只大鼠,给予大鼠八组"条件刺激-无条件刺激(CS-US)"训练,给予无条件刺激后立即进行条件刺激,每组进行训练前30 min给予SB或生理盐水(NS)。获得性训练后,给予2组反射消失性训练,即给予8次条件刺激。条件刺激是给予大鼠10 s,2kHZ声音刺激,无条件刺激是直接给予大鼠食物。结果:给予条件刺激后,四组大鼠摄食行为均明显增加,摄食间隔均明显缩短,当条件刺激强度增加时,摄食行为也增加,而预先给予SB,与NS/NS组相比,其余组大鼠摄食行为相对减少(P0.05),摄食间隔增加。消失性训练中,与NS/NS,NS/SB组相比,SB/NS组和SB/SB组大鼠摄食行为明显减少(P0.05)。与其他三组大鼠相比,SB/NS组大鼠摄食间隔缩短。预先给予SB使后两次刺激后摄食间隔明显增加(P0.05)。结论:OX1R信号通路调控摄食反射的产生和消失。     

KA海马注射对大鼠学习和记忆的影响及雷公藤甲素的保护作用

目的:观察海人藻酸(Kainic acid,KA)海马内注射后大鼠学习记忆的变化及雷公藤甲素(TRP)对其的影响.方法:采用Morris水迷宫筛选空间学习记忆能力正常的SD雄性大鼠90只(200-220g).将实验动物分为:右侧海马注射生理盐水后生理盐水灌胃对照组(NS+NS)、右侧海马注射海人藻酸后生理盐水灌胃干预组(KA+NS)、右侧海马注射海人藻酸后雷公藤甲素灌胃干预组(KA+TRP).动物分别存活1天、3天、5天、7天、14天,用Morris水迷宫检测各组动物空间位置记忆能力:尼氏染色法观察海马CA1区神经元数目和形态.结果:与NS组(NS+NS)比较,KA组(KA+NS)大鼠逃避潜伏期延长(P<0.05).跨越原平台次数减少(P<0.05);CA1区的神经元出现胞体肿胀、排列散乱等形态改变及神经元的丢失(P<0.05);TRP组(TRP+KA)与KA组比较,大鼠的平均逃避潜伏期从第5天起缩短(P＜0.05),跨越原平台次数增多(P<0.05),神经元形态好转,数目增多.结论:KA 海马内注射,可以导致大鼠学习记忆功能障碍及神经元形态的改变;雷公藤甲素干预治疗,能够改善动物的学习和记忆能力,保护海马神经元.     

中枢注射Nesfatin-1与Exendin(9-39)对大鼠摄食和胃肠动力调节的影响

目的:探讨下丘脑室旁核注射GLP-1R拮抗剂Exendin(9-39)对Nesfatin-1所致大鼠摄食和胃肠动力改变的影响及作用机制。方法:选择40只雄性Wistar大鼠,随机分成正常对照组(NC组)、Nesfatin-1组(NS组)、Exendin(9-39)组(ES组)、Nesfatin-1联合Exendin(9-39)组(NE组)。采用下丘脑室旁核(PVN)埋置套管并分别给予以上药物干预,干预前和干预后的12小时、24小时记录和比较各组大鼠的摄食、饮水及体重变化。2天后,采用甲基纤维素-酚红溶液灌胃法测各组大鼠胃排空率,实时荧光定量法(RT-PCR)检测下丘脑及胃组织GLP-1Rm RNA的表达。结果:与基础摄食量比较,NS组大鼠给药后12 h、24 h的摄食量减少(P0.05),NE组大鼠给药后12 h、24 h的摄食量减少(P0.05),但较NS组增加(P0.05);与基础饮水量比较,NS组、NE组给药后12 h饮水量减少(P0.05);与基础体重比较,NS组大鼠给药后12 h、24 h的体重降低(P0.05),NE组大鼠给药后12 h的体重降低(P0.05),但较NS组增加(P0.05);NS组大鼠给药后胃排空率较NC、NE组大鼠显著下降(P0.05),NS组大鼠下丘脑GLP-1Rm RNA的表达量较NC组增加(P0.05)。结论:中枢给予GLP-1R拮抗剂能减弱Nesfatin-1引起的摄食抑制、胃排空延迟及体重下降效应,Nesfatin-1可能通过与GLP-1的协同作用参与摄食及胃肠动力的调节。     

血管活性肠肽对脓毒性休克大鼠肝损伤的保护作用

采用盲肠结扎穿孔(cecal ligation and puncture,CLP)法制备脓毒性休克大鼠模型,探讨血管活性肠肽(vasoactive intestinal peptide,VIP)对脓毒性休克大鼠肝损伤的保护作用及其可能机制.将48只雄性SD大鼠随机分成4组:假手术组(SO,n=12)、CLP组(n=12)、VIP组(n=12)和生理盐水组(NS,n=12).VIP组大鼠在行CLP术后即刻给予6 nmol VIP,应用酶联免疫吸附试验(ELISA)检测各组大鼠血清谷丙转氨酶ALT和谷草转氨酶AST水平,同时检测血清炎症因子:促炎因子肿瘤坏死因子-α(TNF-α),抑炎因子白介素-10(IL-10)的变化;取大鼠肝脏组织行病理检查.在6 h以后的各时间点,与NS组比较,VIP组TNF-α水平明显降低,IL-10水平持续升高,VIP组AST和ALT水平自12 h始明显降低,肝脏病理损伤明显改善.实验表明,VIP通过抑制促炎因子的生成并促进抗炎因子的产生在大鼠脓毒性休克肝损伤中发挥保护作用.     

罗格列酮对肺纤维化大鼠肺动脉壁结缔组织生长因子表达的影响

目的:观察过氧化物酶体增殖活化受体γ(PPAR-γ)激动剂罗格列酮(RSG)对肺纤维化大鼠肺动脉壁结缔组织生长因子(CTGF)上调、Ⅰ型和Ⅲ型胶原沉积的影响。方法:48只雄性SD大鼠,随机分为以下4组:博莱霉素(BLM)+生理盐水(NS)组(n=21)、BLM+RSG组(n=9)、NS+NS组(n=9)和NS+RSG组(n=9)。气管内一次性滴注BLM(5mg/kgbw),RSG灌胃(3mg/(kg.d),14d)。整体实验,气管滴注后第14天观察;离体实验,气管滴注BLM后第14天,分离大鼠的肺动脉,并用RSG培养液和单纯培养液孵育(37℃,5%CO2,24h)。结果:在整体水平,与对照大鼠相比,BLM模型大鼠肺动脉壁的CTGF免疫阳性表达增强,CTGF蛋白含量、Ⅰ型和Ⅲ型胶原含量、Ⅰ/Ⅲ胶原比值均增高(均P0.05);RSG能阻止上述指标的异常变化(均P0.05);在离体水平,RSG能阻止BLM模型大鼠肺动脉壁CTGF的上调(P0.05),但对Ⅰ型和Ⅲ型胶原沉积无明显影响(P0.05)。结论:RSG能直接作用于肺动脉壁,阻止肺纤维化大鼠肺动脉壁CTGF的上调,这可能是其减轻动脉壁结构重塑的机制之一。     

甘草酸二铵对百草枯致急性肾损伤大鼠IL-17表达的影响

目的探讨甘草酸二铵(DG)对百草枯(PQ)中毒致急性肾损伤大鼠的保护作用及其可能机制。方法将50只SD大鼠按随机数字表法分为模型组(PQ组,n=20)、空白对照组(NS组,n=10)和干预组(DG组,n=20),PQ组和DG组大鼠给予PQ 100mg/kg一次性灌胃,NS组大鼠则给予等量生理盐水灌胃。DG组大鼠灌胃后立即给予甘草酸二铵50mg/kg于腹腔注射,每24h重复给药1次,直至72h后处死大鼠。取大鼠腹主动脉血,评估肾功能;病理学观察大鼠肾组织形态学改变情况,ELISA检测血清和肾组织IL-17及IL-16的含量。结果 HE染色结果显示,NS组大鼠肾组织结构正常;PQ染毒组大鼠可见肾小管管腔狭窄,甚至管腔闭锁,间质充血,细胞核固缩,细胞结构消失,肾小球结构紊乱;DG干预组大鼠肾组织病理改变较PQ染毒组大鼠明显减轻。肾功能结果显示,DG组大鼠血清Cr、BUN的水平明显低于PQ组(P0.01),但显著高于NS组(P0.01)。Elisa结果显示,DG组大鼠血清和肾组织中IL-6和IL-17的含量明显低于PQ组(P0.05),但显著高于NS组(P0.05)。结论甘草酸二铵可以减轻百草枯中毒大鼠的急性肾损伤,其机制可能与降低血清和肾组织中IL-6和IL-17的表达水平相关。     

丙型肝炎病毒NS3/4A丝氨酸蛋白酶瞬时表达小鼠模型的建立

目的:建立丙型肝炎病毒NS3/4A丝氨酸蛋白酶体内活性评价模型。方法:利用NS4A/B是NS3/4A丝氨酸蛋白酶作用底物的特性,构建融合基因NS3/NS4A/B-SEAP,底物片段NS4A/B插在NS3/4A和人分泌性碱性磷酸酶(SEAP)之间,融合基因表达后SEAP的分泌依赖于有活性的NS3/4A在NS4A/B位点的切割。将含融合基因的质粒NS3/4A(△4AB)SEAP通过水动力转染技术转染到小鼠体内,检测小鼠血清中SEAP的活性,高活性的SEAP是该评价体系成立的证据。结果与结论:在瞬时表达NS3/4A的小鼠血清中检测到了高活性的SEAP,建立了可用于评价抗NS3/4A的小鼠体内瞬时模型。     

雷公藤甲素对KA损伤大鼠星形胶质细胞的影响

目的:观察海人藻酸(Kainic acid,KA)海马内注射后星形胶质细胞的变化及雷公藤甲素(TRP)对其的影响.方法:90只SD大鼠(200～220g)随机分为3组:右侧海马注射生理盐水后生理盐水灌胃作为对照组(NS+NS),右侧海马注射海人藻酸后生理盐水灌胃干预组(KA+NS),右侧海马注射海人藻酸后雷公藤甲素灌胃干预组(KA+TRP).动物存活1天,3天,5天,7天,14天后免疫组织化学结合图像分析技术观察海马内星形胶质细胞形态和数目的变化.结果:(KA+NS)组海马内星形胶质细胞数目明显增多,胞体明显增大,突起变短,变粗,与(NS+NS)组相比差别具有显著性(p＜0.05);(KA+TRP)组星形胶质细胞数量明显减少,胞体变小,突起变细长,与(KA+NS)组相比差别具有显著性(P＜0,05).结论:KA注射后可导致大鼠海马内星形胶质细胞的激活,雷公藤甲素对KA诱导的星形胶质细胞的活化有抑制作用.     

蛇毒神经生长因子对大鼠脊髓损伤后Caspase-3表达影响

目的 探讨大鼠脊髓损伤后应用蛇毒神经生长因子对Caspase-3表达的影响.方法 将55只成年SD雄性大鼠随机分为蛇毒神经生长因子组（A组）、生理盐水组（B组）、假手术组（C组）,按改良Allen打击法建立大鼠脊髓不完全损伤模型,通过动物神经运动功能BBB评分评价神经损伤程度及神经功能恢复情况;脊髓损伤后不同时间点（6 h、1 d、3 d、7 d、14 d）取材,HE染色观察损伤脊髓组织病理变化,免疫组化染色检测Caspase-3阳性细胞的表达,来比较分析两组的差异性.结果 HE染色镜检发现脊髓组织病理学改变A组明显轻于B组;BBB评分A组相对B明显提高,差异有显著性意义（P〈0.05）.A组和B组均发现凋亡细胞及Caspase-3表达,神经细胞凋亡指数及Caspase-3表达均为B组〉A组（P〈0.05）.结论蛇毒神经生长因子能抑制大鼠脊髓损伤后Caspase-3表达及细胞凋亡,能改善脊髓损伤后的功能表现.     

L-NNA对大鼠急性脊髓损伤的影响

实验采用雌性 Wistar大鼠 41只 ,分为正常对照组、生理盐水对照组和 L - NNA治疗组 ,后两组制成不完全性(2 18克厘米力 )急性脊髓 (第 10胸髓 )损伤模型 ,于术后每天一次腹腔注射 L - NNA (2 0 m g/ kg)或等量生理盐水 ,连续四周 ,然后处死动物 ,行脊髓 NOS染色和超微结构观察。结果显示 ,L - NNA治疗组脊髓 NOS阳性神经元染色较生理盐水对照组浅 ,两组光密度比较 P<0 .0 5 ;超微结构观察 ,生理盐水对照组脊髓神经元胞质呈空泡样变 ,线粒体等细胞器变性 ,髓鞘严重变形 ,少数髓鞘呈线团状改变 ,常伴有高电子密度的块状沉积物。但 L - NNA治疗组脊髓神经元及大部分神经纤维的髓鞘结构清晰。因此我们认为 ,大鼠急性脊髓损伤可诱导神经元 NOS表达 ,L - NNA对其损伤修复起促进作用。     

Local Delivery of High-Dose Chondroitinase ABC in the Sub-Acute Stage Promotes Axonal Outgrowth and Functional Recovery after Complete Spinal Cord Transection

Chondroitin sulfate proteoglycans (CSPGs) are glial scar-associated molecules considered axonal regeneration inhibitors and can be digested by chondroitinase ABC (ChABC) to promote axonal regeneration after spinal cord injury (SCI). We previously demonstrated that intrathecal delivery of low-dose ChABC (1 U) in the acute stage of SCI promoted axonal regrowth and functional recovery. In this study, high-dose ChABC (50 U) introduced via intrathecal delivery induced subarachnoid hemorrhage and death within 48 h. However, most SCI patients are treated in the sub-acute or chronic stages, when the dense glial scar has formed and is minimally digested by intrathecal delivery of ChABC at the injury site. The present study investigated whether intraparenchymal delivery of ChABC in the sub-acute stage of complete spinal cord transection would promote axonal outgrowth and improve functional recovery. We observed no functional recovery following the low-dose ChABC (1 U or 5 U) treatments. Furthermore, animals treated with high-dose ChABC (50 U or 100 U) showed decreased CSPGs levels. The extent and area of the lesion were also dramatically decreased after ChABC treatment. The outgrowth of the regenerating axons was significantly increased, and some partially crossed the lesion site in the ChABC-treated groups. In addition, retrograde Fluoro-Gold (FG) labeling showed that the outgrowing axons could cross the lesion site and reach several brain stem nuclei involved in sensory and motor functions. The Basso, Beattie and Bresnahan (BBB) open field locomotor scores revealed that the ChABC treatment significantly improved functional recovery compared to the control group at eight weeks after treatment. Our study demonstrates that high-dose ChABC treatment in the sub-acute stage of SCI effectively improves glial scar digestion by reducing the lesion size and increasing axonal regrowth to the related functional nuclei, which promotes locomotor recovery. Thus, our results will aid in the treatment of spinal cord injury.     

Recovery of baroreflex control of renal sympathetic nerve activity after spinal lesions in the rat

Spinal cord injury (SCI) has serious long-term consequences on sympathetic cardiovascular regulation. Orthostatic intolerance results from insufficient baroreflex regulation (BR) of sympathetic outflow to maintain proper blood pressure upon postural changes. Autonomic dysreflexia occurs due to insufficient inhibition of spinal sources of sympathetic activity. Both of these conditions result from the inability to control sympathetic activity caudal to SCI. It is well established that limited motor ability recovers after incomplete SCI. Therefore, the goal of this study was to determine whether recovery of BR occurs after chronic, left thoracic spinal cord hemisection at either T(3) or T(8). Baroreflex tests were performed in rats by measuring the reflex response of left (ipsilateral) renal sympathetic nerve activity to decreases and increases in arterial pressure produced by ramped infusions of sodium nitroprusside and phenylephrine, respectively. One week after a T(3) left hemisection, BR function was modestly impaired. However, 8 wk after a T(3) left hemisection, BR function was normal. One week after a T(8) left hemisection, BR function was significantly impaired, and 8 wk after a T(8) left hemisection, BR function was significantly improved. These results indicate that BR of renal sympathetic nerve activity in rats may partially recover after spinal cord hemisections, becoming normal by 8 wk after a T(3) lesion, but not after a T(8) lesion. The nature of the spinal cord and/or brain stem reorganization that mediates this recovery remains to be determined.     

Chondroitinase ABC treatment and the phenotype of neural progenitor cells isolated from injured rat spinal cord

The aim of the present study was to investigate whether enzyme chondroitinase ABC (ChABC) treatment influences the phenotype of neural progenitor cells (NPCs) derived from injured rat spinal cord. Adult as well as fetal spinal cords contain a pool of endogenous neural progenitors cells, which play a key role in the neuroregenerative processes following spinal cord injury (SCI) and hold particular promise for therapeutic approaches in CNS injury or neurodegenerative disorders. In our study we used in vitro model to demonstrate the differentiation potential of NPCs isolated from adult rat spinal cord after SCI, treated with ChABC. The intrathecal delivery of ChABC (10 U/ml) was performed at day 1 and 2 after SCI. The present findings indicate that the impact of SCI resulted in a decrease of all NPCs phenotypes and the ChABC treatment, on the contrary, caused an opposite effect.     

L-NAME对大鼠急性脊髓损伤的影响

实验采用雌性Wistar大鼠15只,分为正常对照组、生理盐水对照组L－NAME治疗组,后两组制成急性脊髓损伤模型,于术后每天一次腹腔注射L－NAME（20kg/kg）或等量生理盐水,连续七天,然后处死动物,行脊髓NOS和Nissl染色。结果显示,L－NAME治疗组脊髓NOS阳性神经元染色较生理盐水对照组浅,组间光密度比较P＜0.05。此外,生理盐水对照组脊髓神经元还出现尼氏体位、减少,甚至消失等现象;这些改变在L－NAME治疗组较轻,因此我们认为,大鼠急性脊髓损伤可诱导神经元NOS表达,L－NAME可对其损伤修复起促进作用。     

补阳还五汤对脊髓损伤后大鼠大脑皮层运动神经元IL-17表达的影响

目的:通过观察补阳还五汤大鼠急性脊髓损伤后大脑神经元细胞凋亡及IL-17的表达的影响,探讨其神经保护机制。方法:SD大鼠24只,分成正常组、假手术组、SCI组、BYHWD组,通过在T3-T4横突间横断右侧半脊髓制备SCI模型,分别于手术前1d及术后1 d、1 w、4 w、8 w运动BBB评分评定大鼠后肢运动功能;术后8 w用Tunnel法检测神经细胞凋亡、免疫组化法检测大鼠神经细胞IL-17的表达。结果:BBB评分比较:SCI组、BYHWD组BBB评分明显低于正常组与假手术组,差异有统计学意义(P0.01);BYHWD组在术后4 w、8 w两个时间点均高于SCI组,差异有统计学意义(P0.05)。细胞凋亡率比较:SCI组与BYHWD组细胞凋亡率均高于正常组与假手术组,且差异有统计学意义(P0.01)。BYHWD组凋亡率低于SCI组且差异有统计学意义(P0.01)。IL-17阳性细胞率比较:SCI组、BYHWD组IL-17阳性细胞率均显著高于正常组与假手术组(P0.01)。BYHWD组IL-17阳性细胞率显著低于SCI组,差异有统计学意义(P0.01)。结论:SCI后大脑皮层神经元的凋亡可能与IL-17的表达增加有关,补阳还五汤可能通过下调IL-17的表达从而减少细胞凋亡。     

Examination of the Combined Effects of Chondroitinase ABC,Growth Factors and Locomotor Training following Compressive Spinal Cord Injury on Neuroanatomical Plasticity and Kinematics

While several cellular and pharmacological treatments have been evaluated following spinal cord injury (SCI) in animal models, it is increasingly recognized that approaches to address the glial scar, including the use of chondroitinase ABC (ChABC), can facilitate neuroanatomical plasticity. Moreover, increasing evidence suggests that combinatorial strategies are key to unlocking the plasticity that is enabled by ChABC. Given this, we evaluated the anatomical and functional consequences of ChABC in a combinatorial approach that also included growth factor (EGF, FGF2 and PDGF-AA) treatments and daily treadmill training on the recovery of hindlimb locomotion in rats with mid thoracic clip compression SCI. Using quantitative neuroanatomical and kinematic assessments, we demonstrate that the combined therapy significantly enhanced the neuroanatomical plasticity of major descending spinal tracts such as corticospinal and serotonergic-spinal pathways. Additionally, the pharmacological treatment attenuated chronic astrogliosis and inflammation at and adjacent to the lesion with the modest synergistic effects of treadmill training. We also observed a trend for earlier recovery of locomotion accompanied by an improvement of the overall angular excursions in rats treated with ChABC and growth factors in the first 4 weeks after SCI. At the end of the 7-week recovery period, rats from all groups exhibited an impressive spontaneous recovery of the kinematic parameters during locomotion on treadmill. However, although the combinatorial treatment led to clear chronic neuroanatomical plasticity, these structural changes did not translate to an additional long-term improvement of locomotor parameters studied including hindlimb-forelimb coupling. These findings demonstrate the beneficial effects of combined ChABC, growth factors and locomotor training on the plasticity of the injured spinal cord and the potential to induce earlier neurobehavioral recovery. However, additional approaches such as stem cell therapies or a more adapted treadmill training protocol may be required to optimize this repair strategy in order to induce sustained functional locomotor improvement.     

乙酰左旋肉碱对大鼠脊髓损伤的神经保护作用及其机制*

目的:观察不同剂量乙酰左旋肉碱(ALC)对脊髓损伤大鼠后肢运动功能恢复和脊髓组织结构的影响,为临床治疗脊髓损伤提供实验和理论依据。方法:将55只8～10周SD大鼠随机分为高(300 mg/kg)、中(200 mg/kg)、低剂量(100 mg/kg)药物干预(SCI+ALC)组、损伤(SCI)组和假手术(Sham)组共5组用于行为学评价、MAD和SOD检测、HPLC检测和HE染色。BBB评分和改良Rivlin斜板实验评价各组大鼠后肢运动功能。HE染色观察对脊髓组织形态结构的影响。另外9只大鼠随机分为Sham组、SCI组和ALC组,用于TUMEL法检测细胞凋亡情况。结果:高、中、低剂量SCI+ALC组干预后BBB评分与SCI组比较,其中中、高剂量ALC组具有显著性差异(P＜ 0.01),大鼠后肢运动功能得以明显改善;Rivlin斜板实验最大倾斜角,SCI+ALC组较SCI组角度明显增加(P＜ 0.05),其中中、高剂量ALC组具有显著性差异(P＜0.01)。HE染色ALC高剂量组较SCI组,组织结构明显改善,炎性细胞和红细胞数量减少,神经细胞核仁部分显示不清。ELISA法检测大鼠损伤节段脊髓组织中SOD活力和MDA含量。结果提示,SCI+ALC组较SCI组SOD活力明显增加,而MDA含量明显降低(P＜0.05),其中中、高剂量ALC组具有显著性差异(P＜0.01)。HPLC色谱显示SCI+ALC组新鲜血清样品与ALC标准品溶液在 260 nm处具有相同的紫外吸收光谱,而Sham组和SCI组血清样品在该处未出现光谱值,说明SCI+ALC组样品中存在与标准品相同的物质。TUNEL染色显示Sham组可偶见凋亡信号,ALC高剂量组较SCI组细胞凋亡信号明显减少(P＜ 0.05)。结论:ALC能促进脊髓损伤大鼠后肢运动功能的恢复,抑制氧化应激和细胞凋亡、对受损脊髓组织具有修复作用。