中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (33): 5327-5332.doi: 10.3969/j.issn.2095-4344.0643

• 干细胞移植 stem cell transplantation • 上一篇    下一篇

静脉移植人脐血间充质干细胞心肌梗死小鼠心内、外单核巨噬细胞M1/M2亚型的转化

彭 漪,陈柄全,赵吉玲,彭智勇,徐维芳,余国龙   

  1. 中南大学湘雅医院心内科,湖南省长沙市 410008
  • 修回日期:2018-06-29 出版日期:2018-11-28 发布日期:2018-11-28
  • 通讯作者: 余国龙,博士,中南大学湘雅医院心内科,湖南省长沙市 410008
  • 作者简介:彭漪,女,1989年生,湖南省吉首市人,土家族,中南大学湘雅医学院在读博士,主要从事间充质干细胞移植改善心肌梗死预后等相关研究。
  • 基金资助:

    国家自然科学基金项目(81570266)

Effects of intravenous transplantation of human umbilical cord blood mesenchymal stem cells on conversion of intra-and extra-cardiac monocyte-macrophages M1/M2 subtypes in mice with acute myocardial infarction

Peng Yi, Chen Bing-quan, Zhao Ji-ling, Peng Zhi-yong, Xu Wei-fang, Yu Guo-long   

  1. Department of Cardiology, Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China
  • Revised:2018-06-29 Online:2018-11-28 Published:2018-11-28
  • Contact: Yu Guo-long, MD, Department of Cardiology, Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China
  • About author:Peng Yi, Doctorate candidate, Department of Cardiology, Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81570266

摘要:

文章快速阅读:

文题释义:
人脐血间充质干细胞:
2000年,Erices等学者首次发表从人脐血中可以分离培养出间充质样细胞,其功能特点和免疫表型与骨髓来源间充质干细胞相似,亦具有分化为软骨细胞、脂肪细胞等潜能。研究表明,85%以上的人脐血间充质干细胞处于G1/G0期,其中只有5%处于G0期,而骨髓间充质干细胞有20%处于G0期,说明人脐血间充质干细胞有更好的活性和扩增性。有研究对于人脐血间充质干细胞移植治疗的安全性进行了较全面的相关实验,所有检测显示实验动物无明显异常,证明人脐血间充质干细胞可作为一种安全有效的移植细胞。
炎症:是具有血管系统的活体组织对损伤因子所发生的复杂的防御反应,凡是能引起组织和细胞损伤的因子都能引起炎症,包括缺血或缺氧等原因引起的组织坏死。坏死组织是潜在的致炎因子,在新鲜梗死灶边缘所出现的出血充血带和炎症细胞浸润都是炎症的表现。急性炎症期浸润的炎症细胞主要为中性粒细胞,后期主要的炎症细胞是单核/巨噬细胞系统。由于临床希望改善心肌梗死患者长期预后促进心肌修复,故心肌梗死的炎症与修复相关研究多关注单核/巨噬系统的动态改变、相关炎症因子与心功能的关系。

 

摘要
背景:
研究表明人脐血间充质干细胞移植可能对炎症有调控作用,参与心肌梗死后缺血心肌保护和改善心功能等,但其对炎症影响的效果仍不明确。
目的:探讨经静脉移植人脐血间充质干细胞对急性心肌梗死小鼠心内、心外单核细胞/巨噬细胞M1/M2亚型转化效应及心脏保护作用。
方法:七八周龄雄性Balb/C小鼠随机分为实验组(7只)和对照组(8只)。心肌梗死造模1周后实验组尾静脉注射含1×106人脐血间充质干细胞的生理盐水0.2 mL,对照组注射等量生理盐水。治疗4周后,流式细胞仪检测外周血及脾脏单核细胞M1/M2比值,超声心动图检测心功能,苏木精-伊红染色观察心肌病理变化、Masson染色观察胶原沉积情况,TUNEL染色检测心肌凋亡及免疫荧光检测心肌组织巨噬细胞M1/M2比值。
结果与结论:①与对照组相比,实验组外周血、脾脏及梗死心肌周边单核细胞/巨噬细胞M1/M2比值较低(P < 0.05);②实验组左心室收缩末期内径、左心室舒张末期内径低于对照组,左室射血分数显著高于对照组(P < 0.05);③实验组心肌梗死区域及周边心肌组织炎症细胞计数低于对照组(P < 0.05);④实验组心肌胶原组织沉积低于对照组(P < 0.05);⑤实验组凋亡指数低于对照组,但差异无显著性意义(P > 0.05);⑥实验证实静脉移植人脐血间充质干细胞可通过调控小鼠心肌梗死局灶及全身系统炎症反应从而改善心功能,是人脐血间充质干细胞移植治疗心肌梗死产生心脏保护效应机制之一。


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
ORCID: 0000-0003-2920-7876(彭漪)

关键词: 急性心肌梗死, 脐血间充质干细胞, 静脉移植, 单核/巨噬细胞, 炎症, 干细胞, 国家自然科学基金

Abstract:

BACKGROUND: Studies have shown that transplantation of human umbilical cord blood mesenchyme stem cells (hUCB-MSCs) may reduce inflammation, improve cardiac function and participate in ischemic myocardial protection. However, there is still no final conclusion on the anti-inflammatory effect of hUC-MSCs.
OBJECTIVE: To investigate the effects of intravenous transplantation of hUCB-MSCs on the conversion of intra- and extra-cardiac monocyte-macrophages subtypes LY-6C hi (M1)/LY-6 low (M2) and cardiac protection in mice with acute myocardial infarction (AMI).
METHODS: Balb/C mice with AMI, aged 7-8 weeks, were randomly divided into experimental group (n=7) and control group (n=8). At 1 week after AMI, the experimental group was injected with 0.2 mL of saline containing 1×106 hUCB-MSCs via tail vein, and the control group was given 0.2 mL of saline with no cells. At 4 weeks after treatment, the M1/M2 ratio in the peripheral blood and spleen was measured by flow cytometry. Cardiac function was measured by echocardiography. Pathological changes of the myocardium, collagen sediment, apoptosis in myocardial cells, and myocardial macrophage M1/M2 cell count were detected by hematoxylin-eosin staining, Masson staining, TUNEL staining and immunofluorescence analysis, respectively.
RESULTS AND CONCLUSION: Compared with the control group, monocyte-macrophages M1/M2 ratio in the peripheral blood, spleen and peri-infarcted myocardial tissue was lower in the experimental group (P < 0.05). Compared with the control group, cardiac functions were significantly improved in the experimental group presenting with lower left ventricular end-systolic diameter, left ventricular end-diastolic diameter as well as higher left ventricular ejection fraction (P < 0.05). Compared with the control group, the inflammatory cell count in the infarction area and surrounding tissue was significantly lower in the experimental group (P < 0.05). Compared with the control group, the amount of collagen sediment was significantly less in the experimental group (P < 0.05). Compared with the control group, the apoptosis index was lower in the experimental group, but there was no significant difference between the two groups (P > 0.05). These experimental findings verify that the intravenous transplantation of hUCB-MSCs can improve cardiac function of AMI mice by regulating systemic inflammatory responses and focal infarct lesions, which is one of the mechanisms by which hUCB-MSCs transplantation for myocardial infarction produces myocardial protection. 


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

Key words: Myocardial Infarction, Cord Blood Stem Cell Transplantation, Injections, Intravenous, Mononuclear Phagocyte System, Tissue Engineering

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