内皮祖细胞自体移植联合阿托伐他汀治疗大鼠急性心肌梗死效果观察

目的:探讨内皮祖细胞(EPCs)自体移植联合阿托伐他汀治疗对急性心肌梗死(AMI)大鼠心功能的影响。方法:30只SD大鼠随机分为心肌梗死对照组(组Ⅰ)、单纯EPCs移植组(组Ⅱ)和阿托伐他汀联合EPCs移植组(组Ⅲ),每组10只。大鼠无菌心脏采血,应用密度梯度离心法分离单个核细胞,体外培养,获得较纯的EPCs。3组大鼠均结扎左冠状动脉前降支,制造大鼠AMI模型。组Ⅱ、组Ⅲ在模型制备后,于梗死周边区注射5-溴-2’-脱氧尿嘧啶核苷(BrdU)标记的EPCs,组Ⅰ注射等量培养液。24h后,组Ⅲ以阿托伐他汀50mg/(kg.d)灌胃。8周后观察大鼠心功能及血流动力学指标的改变,并以免疫组化方法检测心肌组织内EPCs及修复情况。结果:8周后,3组左室短轴缩短率、射血分数、左室收缩压、左室舒张末压及压力变化速率最大值比较,差异均有统计学意义(F分别为95.7、296.5、844.9、67.6、127.0,P均<0.001)。组Ⅲ大鼠心功能及血流动力学指标较组Ⅱ和组Ⅰ改善(P均<0.05),缺血区域的移植细胞部分分化为血管内皮细胞。组Ⅰ大鼠心肌组织结构紊乱,心肌细胞被瘢痕组织替代;组Ⅱ和组Ⅲ心肌结构排列明显有序。结论:EPCs移植联合阿托伐他汀治疗AMI效果优于单纯EPCs移植。

Cognitive improvement following transvenous adipose-derived mesenchymal stem cell transplantation in a rat model of traumatic brain injury

The effects of adipose-derived mesenchymal stem cell (ADMSC) transplantation for the repair of traumatic brain injury remain poorly understood. The present study observed neurological functional changes in a rat model of traumatic brain injury following ADMSC transplantation via the tail vein. Cell transplants were observed in injured cerebral cortex, and expression of brain-derived nerve growth factor was significantly increased in the injured hippocampus following transplantation. Results demonstrated that transvenous ADMSC transplants migrated to the injured cerebral cortex and significantly improved cognitive function.

Effects of Buyang Huanwu Tang Combined with Bone Marrow Mesenchymal Stem Cell Transplantation on the Expression of VEGF and Ki-67 in the Brain Tissue of the Cerebral Ischemia-Reperfusion Model Rat

Objective:To explore the mechanism of Buyang Huanwu Tang (补阳还五汤 Decoction Invigorating Yang for Recuperation) combined with bone marrow mesenchymal stem cells (MSCs) transplantation in protecting nerves of cerebral ischemic injury. Methods: Local cerebral ischemia-reperfusion rat model was established with modified Zea-Longa thread-occlusion method, and MSCs were injected into the caudal vein, and Buyang Huanwu Tang(补阳还五汤)was administrated. Vascular endothelial growth factor (VEGF) and Ki-67 expression in the ischemic side of the brain in the cerebral ischemic-reperfusion rat were detected with immuno-histochemical staining method. Results: VEGF and Ki-67 expressions were significantly up-regulated in the MSCs group and the combination group, with significant differences as compared with the model group and the sham operation group (P<0.05), and with the most strongest effect in the combination group. Conclusion: Buyang Huanwu Tang(补阳还五汤)combined with MSCs transplantation repairs the injured blood vessels and lesion tissues possibly by up-regulation of VEGF and Ki-67 expression.

Effect of allogeneic umbilical cord mesenchymal stem cell transplantation in a rat model of hepatic cirrhosis

OBJECTIVE：To determine the effects of human umbilical cord mesenchymal stem cell （UCMSC） transplantation, alone or in combination with tanshi- none IIA （Tan ⅡA） on hepatic cirrhosis in rats. METHODS： A rat model of cirrhosis was established. Rats were divided into control, UCMSC, and UCSMC plus Tan IIA groups. Rats in the UCMSC group were injected via the tail vein with 0.2 mL Dil-labeled UCMSC suspension. Intraperitoneal Tan ⅡA injections （20 mg/kg） were started on the day of UCMSC transplantation in the UCMSC plus Tan IIA group, and continued for 7 consecutive days thereafter. Rats were sacrificed 1 day, 3 days, 1 month, and 3 months after transplantation and the numbers of Dil-labeled UCMSCs colonizing the liver were determined. Albumin （ALB） and alanine aminotransferase （ALT） levels were measured in venous blood, and mRNA and protein expression lev- els of human ALB and cytokeratin （CK）-18 in liver tissues were determined by reverse transcrip- tion-polymerase chain reaction and western blotting, respectively.RESULTS： Serum ALT levels were significantly lower and serum ALB levels significantly higher in rats in the UCMSC group compared with the control group （P 〈 0.05）. Hepatic CK-18 and ALB mRNA and protein expression levels increased after transplantation, and were significantly higher in the UCMSC plus Tan ⅡA group compared with the UCMSC group （P 〈 0.05）.CONCLUSION： Human UCMSCs transplanted into rats with liver cirrhosis can grow and differentiate into hepatocyte-like cells resulting in improved liver function in vivo. Tan ⅡA further influenced transplantation outcomes.

In vivo tracing of superparamagnetic iron oxide-labeled bone marrow mesenchymal stem cells transplanted for traumatic brain injury by susceptibility weighted imaging in a rat model

Objective：To label rat bone marrow mesenchymal stem cells （BMSCs） with superparamagnetic iron oxide （SPIO） in vitro, and to monitor the survival and location of these labeled BMSCs in a rat model of traumatic brain injury （TBI） by susceptibility weighted imaging （SWI）sequence.Methods：BMSCs were cultured in vitro and then labeled with SPIO. Totally 24 male Sprague Dawley （SD） rats weighing 200-250 g were randomly divided into 4 groups： Groups A-D （n=6 for each group）. Moderate TBI models of all the rats were developed in the left hemisphere following Feeney＇s method. Group A was the experimental group and stereotaxic transplantation of BMSCs labeled with SPIO into the region nearby the contusion was conducted in this group 24 hours after TBI modeling. The other three groups were control groups with transplantation of SPIO, unlabeled BMSCs and injection of nutrient solution respectively conducted in Groups B, C and D at the same time. Monitoring of these SPIO-labeled BMSCs by SWI was performed one day,one week and three weeks after implantation.Results： Numerous BMSCs were successfully labeled with SPIO. They were positive for Prussian blue staining and intracytoplasm positive blue stained particles were found under a microscope （×200）. Scattered little iron particles were observed in the vesicles by electron microscopy （×5000）. MRI of the transplantation sites of the left hemisphere demonstrated a low signal intensity on magnitude images,phase images and SWI images for all the test rats in Group A, and the lesion in the left parietal cortex demonstrated a semicircular low intensity on SWI images, which clearly showed the distribution and migration of BMSCs in the first and third weeks. For Group B, a low signal intensity by MRI was only observed on the first day but undetected during the following examination. No signals were observed in Groups C and D at any time points.Conclusion：SWI sequence in vivo can consecutively and noninvasively trace and demonstrate the status and distribution of BMSCs labeled with SPIO in the brain of TBI model rats.