骨髓间充质干细胞移植脑梗死大鼠：神经功能恢复与突触素的表达

BACKGROUND:Synaptophysin plays an important role in the recovery of neural function after cerebral ischemia. OBJECTIVE:To investigate the effects of bone marrow mesenchymal stem cell transplantation on nervous function and expression of synaptophysin after cerebral infarction. METHODS:Totally 60 rats were equivalently randomized into four groups, including sham operation, control, model and stem cell treatment groups. Rats in the control, model and stem cell treatment groups were used for preparing cerebral infarction models, and the remaining underwent the sham operation. After 1 day of modeling, bone marrow mesenchymal stem cells were transplanted into the rat lateral ventricle in the stem cell treatment group, and rats in the control group was given the injection of the same amount of PBS. After 1, 7 and 14 days of treatment, rat’s neurological function was scored on beam-walking test, rotarod test and screen test, and expression of synaptophysin was detected by RT-PCR and immunohistochemical assay. RESULTS AND CONCLUSION:At 7 and 14 days after treatment, the beam-walking test, rotarod test and screen test scores in the stem cell treatment group were significantly lower than those in the control and model groups (P < 0.05), and the above scores showed no significant differences between the control group and model group (P > 0.05). At 1 day after treatment, the mRNA expression of synaptophysin and the number of synaptophysin-positive cells in the sham operation group were significantly higher than those in the other three groups (P < 0.05); at 7 and 14 days after treatment, the mRNA expression of synaptophysin and the number of synaptophysin-positive cells in the stem cell treatment group were significantly increased compared with the other three groups (P < 0.05), and additionally, the mRNA expression of synaptophysin and the number of synaptophysin-positive cells in the sham operation group were significantly lower than those in the model and control groups (P < 0.05). These findings suggest that bone marrow mesenchymal stem cell transplantation can effectively promote the recovery of neurological function in cerebral infarction rats, and partially promote the formation of synaptophysin.     

高压氧联合骨髓间充质干细胞移植修复缺氧缺血性脑损伤

背景：单纯骨髓间充质干细胞移植对脑梗死组织的修复作用并不理想,需要结合药物及生物工程材料等手段进行综合治疗。 目的：验证高压氧结合骨髓间充质干细胞移植修复大鼠缺氧缺血性脑损伤的效果。 方法：体外培养大鼠骨髓间充质干细胞。应用线栓法建立大脑中动脉阻塞大鼠模型,按随机区组法分为3组,即对照组、骨髓间充质干细胞移植组及高压氧+骨髓间充质干细胞移植组。静脉移植后24 h,3 d及伤后1,2 周行Longa行为学评分,检测神经功能的损伤情况。移植2周后,应用RT-PCR法测定生长相关蛋白43 mRNA的表达,并以BrdU免疫组化和苏木精-伊红染色行梗死处组织学检查以证实恢复程度。 结果与结论：移植后1周,高压氧+骨髓间充质干细胞移植组大鼠神经功能障碍评分低于骨髓间充质干细胞移植组,骨髓间充质干细胞移植组低于对照组(P  < 0.05)。2周后脑梗死周围组织生长相关蛋白43 mRNA的表达高压氧+骨髓间充质干细胞移植组高于骨髓间充质干细胞移植组,骨髓间充质干细胞移植组高于对照组(P < 0.05)。BrdU免疫组化和苏木精-伊红切片中的神经元数量高压氧+骨髓间充质干细胞移植组多于骨髓间充质干细胞移植组,骨髓间充质干细胞移植组多于对照组(P < 0.05)。提示高压氧联合骨髓间充质干细胞静脉移植治疗大鼠缺氧缺血性脑损伤可明显改善大鼠的神经功能,效果优于单纯骨髓间充质干细胞移植。     

灯盏花素注射液对骨髓间充质干细胞的诱导分化

目的探索灯盏花素注射液体外诱导大鼠骨髓间充质细胞(BMSCs)分化为神经元和胶质细胞的可行性。方法贴壁法分离纯化SD大鼠骨髓间充质细胞。第4代细胞行表型鉴定后,用灯盏花素注射液诱导,每6h倒置相差显微镜观察形态变化,免疫细胞化学染色鉴定诱导后细胞的神经元特异性稀醇化酶(NSE)、神经胶质纤维酸性蛋白(GFAP)的表达情况,四甲基偶氮唑盐(MTT)检测不同浓度灯盏花素注射液诱导后细胞的活力,流式细胞术及RT-PCR检测诱导前后细胞中NSE、GFAP mRNA的表达变化。结果BMSCs表型鉴定为CD44+、CD54+、CD34-,诱导18h后BMSCs胞体开始收缩,有突起伸出,24h后突起增多形成网络结构。免疫细胞化学染色,NSE阳性表达率为(48.7±3.4)%,GFAP阳性表达为(56.8±4.2)%,流式细胞仪检测诱导24h后的细胞NSE及GFAP蛋白表达量均较未诱导组升高,RT-PCR检测诱导后细胞表达NSE、GFAP mRNA,未诱导的细胞则不表达。结论灯盏花素注射液可诱导大鼠骨髓间充质细胞在体外分化为神经元和神经胶质细胞。     

灯盏细辛联合骨髓间充质干细胞移植对脑梗死的保护作用机制

背景：通过细胞移植重建损伤脑组织成为治疗脑梗死的新途径,骨髓间充质干细胞成为近年来细胞移植治疗领域的重要种子细胞之一。 目的：探讨灯盏细辛注射液联合骨髓间充质干细胞移植对急性脑梗死大鼠S100B蛋白及超氧化物歧化酶表达的影响。 方法：采用线栓法制作大鼠急性脑梗死模型,建模成功后将80只SD大鼠随机分为对照组、灯盏细辛组、骨髓间充质干细胞组及联合组。分别于治疗前后用酶联免疫法检测各组大鼠血清S100B蛋白水平,黄嘌呤氧化酶法检测各组大鼠血清超氧化物歧化酶的表达;通过NIHSS神经功能评分观察模型大鼠的神经行为学变化,通过TTC染色测定脑梗死体积。 结果与结论：在治疗后第3,7,14天,灯盏细辛组、骨髓间充质干细胞组的S100B蛋白水平明显低于对照组,但高于联合组,差异有显著性意义(P < 0.05);灯盏细辛组、骨髓间充质干细胞的超氧化物歧化酶表达水平明显高于对照组,低于联合组,差异有显著性意义(P < 0.05);治疗后第1,2,3周各组的NIHSS神经功能评分比较,联合组<灯盏细辛组及骨髓间充质干细胞组<对照组,差异有显著性意义(P < 0.05);在治疗后2周联合组的脑梗死体积明显小于灯盏细辛组及骨髓间充质干细胞组,灯盏细辛组及骨髓间充质干细胞组又明显小于对照组,差异有显著性意义(P < 0.05)。结果表明灯盏细辛注射液联合骨髓间充质干细胞移植能够抑制急性脑梗死大鼠S100B蛋白表达,提高超氧化物歧化酶活性,从而起到脑保护作用。 中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

丹红注射液联合骨髓间充质干细胞移植治疗大鼠脑梗死

背景：单纯骨髓间充质干细胞移植修复受损脑组织的作用并不十分理想。 目的：观察丹红注射液联合骨髓间充质干细胞移植治疗大鼠脑梗死的效果。 方法：用线栓法制备大鼠大脑中动脉阻塞模型,随机分为3组,模型组尾静脉注射PBS、丹红注射液组尾静脉注射2 mL/kg丹红注射液、联合治疗组联合注射2 mL/kg丹红注射液+2.0×10⁹ L^-1的骨髓间充质干细胞悬液,连续5 d,1次/d。 结果与结论：在骨髓间充质干细胞移植后2周,联合治疗组神经功能评分明显优于模型组及丹红注射液组(P < 0.05);移植后3周联合治疗组大鼠脑梗死体积明显小于模型组和丹红注射液组(P < 0.05);病理组织学观察也可见联合治疗组的组织损伤减轻程度大于丹红注射液组和模型组。结果可见丹红注射液联合骨髓间充质干细胞移植治疗大鼠脑梗死疗效显著,可以对脑细胞起到保护作用。     

银杏达莫注射液联合骨髓间充质干细胞移植改善脑梗死后的神经功能

背景：通过细胞移植重建损伤脑组织成为治疗脑梗死的新途径,骨髓间充质干细胞成为近年来细胞移植治疗领域的研究热点。 目的：探讨银杏达莫注射液联合骨髓间充质干细胞移植对脑梗死大鼠神经功能的改善作用及相关机制。 方法：利用线栓法制作大鼠大脑中动脉闭塞模型,建模成功后60只SD大鼠随机分为对照组、细胞移植组及联合组。对照组尾静脉注射PBS、细胞移植组尾静脉注射2.5×109 L-1的骨髓间充质干细胞悬液、联合组尾静脉注射2.5×109 L-1的骨髓间充质干细胞悬液和银杏达莫2 mL/kg,1次/d,连续注射5 d。于移植后的1,3 d及1,2 周进行mNSS行为学评分,以观察大鼠神经功能缺损状况。移植后2周RT-PCR检测脑组织中脑源性神经生长因子、生长相关蛋白43基因表达变化,TUNEL法检测细胞凋亡情况,免疫组化法检测BrdU阳性细胞数。 结果与结论：移植后的1,3 d各组大鼠神经功能缺损评分差异无显著性意义(P > 0.05),在移植后1,2周,联合组神经功能缺损评分低于细胞移植组及对照组(P < 0.05);移植后2周,联合组脑源性神经生长因子、生长相关蛋白43 mRNA表达明显高于细胞移植组及对照组(P < 0.05),联合组凋亡细胞数目明显少于细胞移植组及对照组(P < 0.05),联合组BrdU阳性细胞数量明显多于细胞移植组及对照组(P < 0.05)。结果表明骨髓间充质干细胞联合银杏达莫干预能促进脑梗死组织脑源性神经生长因子、生长相关蛋白43 mRNA的表达,抑制细胞凋亡,改善大鼠神经功能。  中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程      

促红细胞生成素基因修饰骨髓间充质干细胞移植治疗大鼠脑梗死

背景：促红细胞生成素具有神经元的保护及促进神经再生的作用。目的：观察促红细胞生成素修饰的骨髓间充质干细胞尾静脉移植对大鼠脑梗死的治疗效果。方法：用Western blot鉴定外源人促红细胞生成素基因在骨髓间充质干细胞中的表达。采用线栓法建立大鼠大脑中动脉阻塞模型,模型组尾静脉注射PBS、骨髓间充质干细胞组注射骨髓间充质干细胞悬液,促红细胞生成素-骨髓间充质干细胞组注射转染了促红细胞生成素的骨髓间充质干细胞悬液。移植后3 d及移植后1,2,3,4 周行改良神经功能评分,检测神经功能的损伤情况。移植后4 周将大鼠麻醉后断头取脑,RT-PCR检测脑组织中bcl-2/bax基因表达变化,用原位末端标记法测定细胞凋亡情况、苏木精-伊红染色及荧光显微镜观察PKH26标记的骨髓间充质干细胞的存活和分布情况。结果与结论：Western blot结果显示,转染人促红细胞生成素基因的骨髓间充质干细胞体外能表达促红细胞生成素蛋白。移植后1-4周,骨髓间充质干细胞组和促红细胞生成素-骨髓间充质干细胞组神经缺损评分明显低于模型组(P < 0.05,P < 0.01)。与骨髓间充质干细胞组及模型组相比,大鼠脑梗死区组织促红细胞生成素-骨髓间充质干细胞组bcl-2基因的表达明显增高(P < 0.05),bax基因的表达明显降低(P < 0.05),凋亡细胞明显减少,PKH26阳性细胞数明显增多(P < 0.05)。结果证实,促红细胞生成素修饰的骨髓间充质干细胞尾静脉移植对脑梗死大鼠脑梗死疗效较好。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程全文链接：     

骨髓间充质干细胞移植联合依达拉奉治疗大鼠脑梗死

背景：依达拉奉具有清除自由基和抑制脂质过氧化反应的作用,能够改善中枢神经系统损伤区的微环境。 目的：观察骨髓间充质干细胞移植联合依达拉奉治疗大鼠脑梗死的效果。 方法：采用线栓法建立大鼠大脑中动脉阻塞模型,随机分为3组,对照组经尾静脉注射细胞培养液,骨髓间充质干细胞组经尾静脉注射2.0×109 L^-1的骨髓间充质干细胞悬液,依达拉奉+骨髓间充质干细胞组经尾静脉注射2.0×109 L^-1骨髓间充质干细胞悬液同时经腹腔注射依达拉奉3 mg/(kg•d),连续5 d。移植后行神经功能缺损评分,应用RT-PCR测定脑梗死组织水通道蛋白9及水通道蛋白4 mRNA的表达,并经全脑冷冻切片苏木精-伊红染色及荧光显微镜观察细胞自然存活及分布情况。 结果与结论：移植后24 h,3 d各组间神经功能缺损评分差异无显著性意义(P > 0.05),移植后2周,依达拉奉+骨髓间充质干细胞组大鼠神经功能缺损评分低于骨髓间充质干细胞组及对照组(P < 0.05-0.01)。骨髓间充质干细胞组大鼠脑梗死周围组织水通道蛋白9 及水通道蛋白4 mRNA的表达高于依达拉奉+骨髓间充质干细胞组,却低于对照组(P < 0.05)。依达拉奉+骨髓间充质干细胞组CM-Dil阳性细胞和神经元数量多于骨髓间充质干细胞组及对照组(P < 0.05)。提示移植的骨髓间充质干细胞可移行至大鼠脑梗死灶周围并存活,分化为神经元样细胞。联合注射用依达拉奉治疗可明显改善脑梗死大鼠的神经学功能。     

同种异体骨髓间充质干细胞移植上调急性心肌梗死大鼠Cx43的表达

目的研究同种异体骨髓间充质干细胞(MSCs)移植心肌梗死(MI)大鼠后缝隙连接蛋白43(Cx43)在不同时期的动态变化。方法建立大鼠MI模型。将同种异体MSCs用5-氮胞苷诱导成心肌样细胞并行荧光标记,经二次开胸注射入MI大鼠梗死区和梗死边缘区。各亚组分别于移植后4、8和12周在荧光显微镜下跟踪MSCs移植情况。同时用免疫组化分析Cx43表达与缝隙连接(GJ)分布。结果MSCs体外诱导可分化为自发搏动的心肌样细胞,表达心肌特异性肌钙蛋白T(cTnT)和形成肌丝结构。MSCs移植后可长期存活并在4、8和12周,并有效上调缺血区Cx43的表达,改善GJ分布紊乱状态。在梗死区Cx43无特殊改变。结论MSCs具有分化为心肌样细胞的可塑性,移植后上调MI后缺血区Cx43表达,改善GJ分布紊乱。     

三七皂苷联合骨髓间充质干细胞移植促进急性脑损伤的恢复

BACKGROUND:Studies have shown that Panax notoginseng saponins (PNS) has extensive pharmacological basis for the treatment of cerebral ischemic injury, and animal experiments for treatment of brain injury by bone marrow mesenchymal stem cell transplantation are ongoing. However, little is reported about the combined use of PNS and bone marrow mesenchymal stem cell transplantation. OBJECTIVE:To investigate the effect of PNS combined with bone marrow mesenchymal stem cell transplantation on traumatic brain injury in rats. METHODS:Traumatic brain injury models were made in 60 Sprague-Dawley rats by hydraulic shock method. Then, model rats were randomized into model group, cell transplantation group receiving bone marrow mesenchymal stem cell transplantation and combined treatment group undergoing PNS combined with bone marrow mesenchymal stem cell transplantation. Nerve function recovery of the rats and protein expression of nerve growth factor in the brain tissue were evaluated and detected by Bederson scoring and western blot methods, respectively. Morphological changes of the brain tissue and apoptosis in cortical neurons were observed and detected by hematoxylin-eosin staining and TUNEL, respectively. RESULTS AND CONCLUSION:Highest Bederson score was found in the model group, followed by the cell transplantation group and combined treatment group (P < 0.05), while the protein expression of nerve growth factor was ranked as follows: the combined treatment group > the cell transplantation group > the model group (P < 0.05). Inflammatory infiltration and brain edema in the brain were relieved markedly in the combined treatment group compared with the other two groups, and the number of apoptotic neurons was significantly reduced as well. Our findings suggest that PNS combined with bone marrow mesenchymal stem cell transplantation can promote neurological recovery from traumatic brain injury by increasing the expression of nerve growth factor and reducing neuronal apoptosis.     

骨髓间充质干细胞移植脑梗死模型后的CT、MRI特征分析

背景：研究表明骨髓间充质干细胞可通过多种途径发挥促进脑组织功能恢复的作用。 目的：分析骨髓间充质干细胞移植脑梗死模型大鼠的CT、MRI特征。 方法：将40只脑梗死模型大鼠随机分为2组,梗死组通过尾静脉注射1 mL PBS、移植组通过尾静脉注射1 mL细胞浓度为2.0×109 L-1的细胞悬液。于移植后1,2,3周进行神经功能缺损评分(mNSS),评价神经功能恢复情况;于移植后的6 h,1,3,5,7 d对各组大鼠行CT及MRI扫描,观察脑梗死区TIWI、T2WI、FLAIR、DWI序列的信号改变特征,梗死体积大小。测量脑梗死区域T1WI、T2WI、FLAIR、DWI序列的信号强度比(SIR)及其相对变化率(?SIR),并与正常对侧相应解剖区域进行比较。 结果与结论：移植后1,2,3周,移植组的神经功能缺损评分明显低于梗死组(P < 0.05);移植后3,5,7 d时移植组脑梗死体积较梗死组显著减少(P < 0.05),移植组T1WI序列SIR均明显高于梗死组,T2WI、FLAIR序列SIR较梗死组显著降低,差异有显著性意义(P < 0.05);移植后7 d时移植组DWI序列SIR较梗死组明显降低(P < 0.05)。移植组T1WI序列?SIR与梗死组比较差异无显著性意义(P > 0.05),移植组T2WI、FLAIR及DWI序列?SIR较梗死组显著增高,差异有显著性意义(P < 0.05)。结果显示MRI可显示大脑任意角度的切面像,对骨髓间充质干细胞移植治疗脑梗死的疗效评价起重要作用。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

中华小型猪心肌梗死后移植同种异体骨髓间充质干细胞归巢时间窗

背景：心肌梗死后不同时间点进行骨髓间充质干细胞移植,其归巢至损伤组织的能力以及起到的修复作用将有很大的不同。 目的：探索心肌梗死后移植的骨髓间充质干细胞归巢于心肌组织的最佳时间窗。 方法：将18头中华小型猪采用开胸结扎左冠状动脉前降支的方法建立急性心肌梗死模型。造模成功后1 d,3 d,1周,2周,3周,4周6个时间点经冠状动脉注射BrdU标记的骨髓间充质干细胞,于移植后3 d处死动物,检测心肌梗死区骨髓间充质干细胞的归巢量。 结果与结论：心肌梗死后1 d,3 d,1周,2周,3周,4周均可见有细胞核呈棕黄色的BrdU标记的阳性细胞,其中心肌梗死后1周的阳性细胞分布最多且最集中,高于其他5个时间点(P < 0.05)。说明骨髓间充质干细胞归巢的最佳时间窗为心肌梗死后1周,在此时间点给予干细胞移植促进心肌修复有一定意义。 中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程全文链接：     

骨髓间充质干细胞调节心脏移植大鼠的免疫功能

BACKGROUND:Heart transplantation is an effective method for treatment of end-stage heart failure, but immune rejection that seriously impact therapeutic effacicy is easy to occur after transplantation. OBJECTIVE:To investigate the regulatory effect of bone marrow mesenchymal stem cells on the immune function of rats undergoiong heart transplantation. METHODS:Twenty Lewis rats were enrolled as donors, and 20 Wistar rats as recipients. Heart transplantation models were established in the Wistar rats. These 20 model rats were randomized into cell transplantation and control group with 10 rats in each group. Forty-eight hours after heart transplantation, rats in the cell transplantation group were given bone marrow mesenchymal stem cell suspension (1 mL, 2×10⁸ cells/L) via the tail vein, while rats in the control group were given normal saline in the same dose. Then, the expression levels of serum interleukin-2, interleukin-10 and percentage of CD4⁺, CD8⁺, CD4⁺/CD8⁺, CD4⁺CD25^high, CD4⁺CD25^high Foxp3⁺ T cells in the venous blood were detected in the two groups at 7 days after cell transplantation. Additionally, rat myocardial tissues were taken and observed pathologically. RESULTS AND CONCLUSION:The survival time of the cell transplantation group was significantly longer than that of the control group (P < 0.05). The expression level of interleukin-2 showed no significant difference between the two groups (P > 0.05), but the level of interleukin-10 in the cell transplantation group was significantly higher than that in the control group (P < 0.05). Compared with the control group, the percentage of CD4⁺/CD8⁺, CD4⁺CD25^high, CD4⁺CD25^high Foxp3⁺ and CD4⁺ T cells was significantly higher, and the percentage of CD8⁺ T cells was significantly lower in the cell transplantation group (P < 0.05). Histopathological findings showed that there were a small amount of infiltrated lymphocytes in the cell transplantation group with the presence of slight bleeding and edema, and these inflammatory reactions were milder than those in the control group. These findings indicate that bone marrow mesenchymal stem cell transplantation can effectively reduce the rejection in rats undergoing heart transplantation.     

骨髓间充质干细胞移植治疗老年性痴呆模型大鼠的行为学检测

BACKGROUND:More recently, studies have demonstrated that bone marrow mesenchymal stem cells can be induced in vitro to differentiate into neuron-like cells that are used for in vivo transplantation to repair nerve damage. OBJECTIVE:To study the effect of bone marrow mesenchymal stem cell transplantation on learning and memory ability of senile dementia rats. METHODS:Thirty male Sprague-Dawley rats were randomly divided into three groups: normal control group, stem cell therapy group and model control group. Rats in the latter two groups were used to establish animal models of senile dementia by intracranial injection of β-amyloid 1-40. Three weeks after modeling, rats were given bilateral hippocampal injection of induced bone marrow mesenchymal stem cell suspension in the stem cell therapy group, whereas no treatment was given in the normal control and model control groups. Morris water maze test was used to detect learning and memory ability of rats, and rat’s brain tissues were detected pathologically using hematoxylin-eosin staining. RESULTS AND CONCLUSION:After modeling, the escape latency was higher and the cross-platform frequency was lower in the model control group compared with the normal control group. After cell transplantation, the escape latency and cross-platform frequency were gradually shortened and increased with time, respectively. Compared with the model control group, the learning and memory abilities of rats were improved in the stem cell therapy group. The brain tissues were relatively intact in structure and exhibited less cell degeneration and necrosis in the stem cell therapy group compared with the model control group. To conclude, bone marrow mesenchymal stem cell transplantation exerts certain therapeutic effects on senile dementia by effectively improving the learning and memory ability.     

PTEN基因沉默骨髓间充质干细胞移植治疗急性心肌梗死

BACKGROUND:Bone marrow mesenchymal stem cell transplantation for myocardial infarction becomes popularized in recent years, but transplanted cells cannot survive and proliferate under early inflammatory reaction or local ischemia/hypoxia microenvironment, eventually hampering the therapeutic outcomes. OBJECTIVE:To investigate the therapeutic effect of PTEN-silenced bone marrow mesenchymal stem cells on acute myocardial infarction. METHODS:(1) Bone marrow mesenchymal stem cells from Sprague-Dawley rats were randomly assigned to receive no treatment, NCsiRNA transfection using Lipofectamin2000 or PTEN siRNA transfection using Lipofectamin2000. Cell growth curves were described using MTT method to detect cell cycle using flow cytometry. (2) Thirty Sprague-Dawley rats were selected to prepare myocardial infarction models that were randomized into three groups (n=10 per group): blank control, negative control and RNAi group. Six hours after modeling, bone marrow mesenchymal stem cells transfected with nothing, NCsiRNA and PTEN siRNA were respectively injected into the infarcted center of the left ventricular anterior wall in these three rat groups. After 4 weeks, all rats were subjected to cardiac function detection using echocardiography, and the survival and proliferation of bone marrow mesenchymal stem cells in the rats were observed by fluorescence microscopy. RESULTS AND CONCLUSION:Compared with the other two groups, a significant increase in the absorbance values at different culture time, the proportion of cells in S+G2 phase, and the number of bone marrow mesenchymal stem cells in the myocardial tissue was found in the RNAi group (all P < 0.05). Additionally, the left ventricular ejection fraction and left ventricular shortening fraction were significantly reduced in the RNAi group than the blank control and negative control groups at 4 weeks after cell transplantation (P < 0.05). Both in vivo and in vitro experimental findings showed that PTEN silencing could effectively improve cell survival and proliferation in the infarcted myocardium. Moreover, in the in vivo experiment, an overt improvement in rat’s cardiac function was achieved.      

同种异体骨髓间充质干细胞移植在心肌梗死后心室重建中的作用

BACKGROUND:Myocardial infarction leads to ischemic changes in the myocardium, triggering the emergence of ventricular remodeling, which is an important cause of death. Myocardial infarction is a common disease in the middle-aged and elderly population, but autologous bone marrow mesenchymal stem cells from these patients exhibit a weak ability of proliferation and differentiation. Therefore, a positive attempt of allogeneic stem cell transplantation is required in order to obtain better therapeutic outcomes. OBJECTIVE:To explore the effect of allogeneic bone marrow mesenchymal stem cells on ventricular remodeling after myocardial infarction.   METHODS:Bone marrow mesenchymal stem cells from 10 neonatal rats and 10 adult rats were isolated, cultured and identified. Another 40 rats were randomly assigned into four groups (n=10/group): model group, neonatal rat cell transplantation group, adult rat cell transplantation group, or sham group. Animal models of myocardial infarction were made in rats in the all groups except for the sham group in which the rats were given sham operation. Rats in the two cell transplantation groups were given the corresponding cell transplantation. Four weeks postoperatively, heart function of rats was detected in each group, and cardiac tissues were taken to detect changes in collagen formation and blood vessel density in the infarct area. RESULTS AND CONCLUSION:Four weeks after surgery, rats in the model group showed significant changes in cardiac function indexes as compared with the other groups (P < 0.05), while compared with the model group, these cardiac function indexes improved in both two cell transplantation groups, but there was no significant difference between the two cell transplantation groups (P > 0.05). Meanwhile, compared with the model group, significantly decreased collagen formation and increased blood vessel density were found in both two cell transplantation groups (P < 0.05). Additionally, the vascular density of the infarct area was highest in the sham group (P < 0.05). Experimental results show that both neonatal and adult rat bone marrow mesenchymal stem cell transplantation can improve cardiac function of rats, reduce the formation of collagen in the infarct area and delay ventricular remodeling after myocardial infarction.     

骨髓间充质干细胞移植治疗肢体缺血的机制

背景：骨髓间充质干细胞移植治疗下肢缺血疾病已取得较好的效果,但其作用机制尚无定论。 目的：探讨骨髓间充质干细胞移植治疗SD大鼠后肢缺血的机制。 方法：结扎肾动脉下腹主动脉、腰动脉和髂腰动脉制备雌性SD大鼠后肢缺血模型。将扩增、纯化的雄性SD大鼠骨髓间充质干细胞注射入大鼠缺血的右后肢股直肌中,对照组右后肢注射等量生理盐水。移植后2,4,6周,制备大鼠右股直肌切片行苏木精-伊红染色、血管内皮生长因子免疫组织化学染色、SRY基因免疫组织化学染色。 结果与结论：移植后2,4,6周移植组右股直肌毛细血管计数、血管内皮生长因子免疫组织化学染色阳性细胞计数均明显高于对照组(P < 0.01)。移植组股直肌切片中SRY免疫组织化学染色阳性细胞出现于毛细血管壁,并散在分布于肌组织中。结果表明局部注射移植骨髓间充质干细胞能促进缺血组织迅速生成大量毛细血管,改善大鼠缺血下肢的血供。骨髓间充质干细胞作为旁分泌细胞,通过增加血管内皮生长因子的分泌,促使大鼠缺血肢体的血管新生。中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程全文链接：