中国组织工程研究 ›› 2012, Vol. 16 ›› Issue (49): 9152-9156.doi: 10.3969/j.issn.2095-4344.2012.49.006

• 骨髓干细胞 bone marrow stem cells • 上一篇    下一篇

亚低温下脑缺血大鼠骨髓间充质干细胞迁移和梗死体积的变化

张其梅1,彭 玉1,游 辉1,李守华2,严国山3,张昭文1,杨 波1,兰 晶1,郑 铮1,池 英1   

  1. 1三峡大学第一临床医学院&宜昌市中心人民医院神经内科,湖北省宜昌市 443003; 2宜昌市夷陵医院神经内科,湖北省宜昌市 443100;3当阳市人民医院神经内科,湖北省当阳市 444100
  • 收稿日期:2012-05-07 修回日期:2012-07-16 出版日期:2012-12-02 发布日期:2012-07-16
  • 通讯作者: 彭玉,硕士,副主任医师,三峡大学第一临床医学院&宜昌市中心人民医院神经内科,湖北省宜昌市 443003 ycpengyu@126.com
  • 作者简介:张其梅★,女,1965年生,湖北省宜昌市人,汉族,1987年华中科技大学同济医学院毕业,硕士,主任医师,主要从事神经病学的研究。 ycpengyu123@126.com
  • 基金资助:

    湖北省三峡大学第一临床医学院科研发展项目;宜昌市科技研究与开发项目(A11301-05)。

Migration of bone marrow mesenchymal stem cells and changes in infarct volume in rats with cerebral ischemia under mild hypothermia 

Zhang Qi-mei1, Peng Yu1, You Hui1, Li Shou-hua2, Yan Guo-shan3, Zhang Zhao-wen1, Yang Bo1, Lan Jing1, Zheng Zheng1, Chi Ying1   

  1. 1Department of Neurology, the First Clinical Medical College, Yichang Central People’s Hospital, Three Gorges University, Yichang 443003, Hubei Province, China; 2Department of Neurology, Yichang Yiling Hospital, Yichang 443100, Hubei Province, China; 3Department of Neurology, Dangyang People’s Hospital, Dangyang 444100, Hubei Province, China
  • Received:2012-05-07 Revised:2012-07-16 Online:2012-12-02 Published:2012-07-16
  • Contact: Peng Yu, Master, Associate chief physician, Department of Neurology, the First Clinical Medical College, Yichang Central People’s Hospital, Three Gorges University, Yichang 443003, Hubei Province, China ycpengu@126.com
  • About author:Zhang Qi-mei★, Master, Chief physician, Department of Neurology, the First Clinical Medical College, Yichang Central People’s Hospital, Three Gorges University, Yichang 443003, Hubei Province, China Ycpengyu123@126.com
  • Supported by:

    Research and Development Projects of Hubei Science and Technology Bureau*; a grant from the First Clinical Medical College of Three Gorges University, No. A11301-05*

摘要:

背景:关于亚低温运用到神经损伤修复领域的研究已有一些报道,但亚低温对神经干细胞在脑内移植迁移的影响还不太清楚。
目的:观察亚低温对移植入脑缺血大鼠侧脑室的骨髓间充质干细胞迁移及脑梗死体积的影响。
方法:采用Longa法永久性闭塞SD大鼠大脑中动脉制作局灶性脑缺血损伤模型,50只大鼠随机摸球法分为亚低温组、对照组、假手术组。亚低温组于移植前应用亚低温处理大鼠急性脑缺血损伤,对照组于移植前应用常温处理大鼠急性脑缺血损伤;假手术组大鼠麻醉后分离结扎右侧颈内总动脉。亚低温组和对照组在造模后24 h,在脑立体定向下经侧脑室注射移植用5-BrdU标记的骨髓间充质干细胞。经过5,14,21 d后用免疫组织化学方法检测各组大鼠脑组织BrdU阳性细胞数。
结果与结论:骨髓间充质干细胞移植第14天多数标记的骨髓间充质干细胞已经迁移至梗死灶周围,移植后亚低温组各时间点梗死灶周边皮质的BrdU阳性细胞数明显多于对照组(P < 0.05)。与对照组比较,亚低温组在移植前后各个时间点脑梗死体积均显著减小(P < 0.05)。提示移植前宿主亚低温处理可以促进骨髓间充质细胞的定向迁移,且脑梗死体积显著减小。

关键词: 亚低温, 骨髓间充质干细胞, 脑梗死, 脑缺血, 迁移, 定向迁移, 移植, 神经营养因子, 侧脑室, 梗死体积

Abstract:

BACKGROUND: There are a few reports addressing the application of mild hypothermia to the study of repairing the nerve injury, but few reports have addressed the effects of mild hypothermia on the migration of neural stem cells in the brain following transplantation.
OBJECTIVE: To explore the effects of mild hypothermia on the migration of bone marrow mesenchymal stem cells transplanted into the lateral ventricle of rats with cerebral ischemia, as well as the effect on the infarct volume.
METHODS: A focal cerebral ischemic injury model of right middle cerebral artery occlusion was established using modified Longa’s method in Sprague-Dawley rats. Fifty rats were divided into mild hypothermia group, control group and sham-operation group. Local mild hypothermia was applied in the mild hypothermia group before transplantation for the treatment of acute cerebral ischemia. Normal body temperature was maintained in control group before transplantation for the treatment of acute cerebral ischemia. The right carotid artery of rats in the sham-operation group was separated and ligated after anesthesia. At 24 hours following model establishment in the mild hypothermia group and the control group, bone marrow mesenchymal stem cells labeled with 5-BrdU were transplanted into the rat lateral ventricle. The amount of BrdU-positive cells in the brain tissue in each group was measured by immunohistochemistry at 5, 14 and 21 days following injection in each group.  
RESULTS AND CONCLUSION: At 14 days after transplantation, a majority of labeled bone marrow mesenchymal stem cells had migrated to the infarct area. At various time points following transplantation, the number of BrdU-positive cells in the cortex around infarction focus was obviously greater in the hypothermia group compared with the control group  (P < 0.05). Compared with the control group, the infarct volume in the mild hypothermia group at various time points was reduced significantly (P < 0.05). Results indicate that mild hypothermia before transplantation may promote the direct migration of bone marrow mesenchymal stem cells, and can reduce the infarct volume.

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