中国组织工程研究 ›› 2014, Vol. 18 ›› Issue (20): 3153-3157.doi: 10.3969/j.issn.2095-4344.2014.20.008

• 组织构建细胞学实验 cytology experiments in tissue construction • 上一篇    下一篇

下肢缺血预处理对未成熟心肌细胞凋亡和内质网应激的影响

孙忠东1,宋玉娥2,刘国栋1,张  杰1,郑建伟1   

  1. 1潍坊市人民医院心脏外科,山东省潍坊市  261041;2青岛大学医学院附属青岛市立医院,山东省青岛市  266011
  • 收稿日期:2014-03-25 出版日期:2014-05-14 发布日期:2014-05-14
  • 通讯作者: 宋玉娥,副主任医师,青岛大学医学院附属青岛市立医院,山东省青岛市 266011
  • 作者简介:孙忠东,1970年生,山东省淄博市人,汉族,2002年华中科技大学毕业,博士,硕士生导师,主要从事心外科临床及基础研究。

Effect of limb ischemic preconditioning on immature myocardial cells apoptosis and endopasmic reticulum stress

Sun Zhong-dong1, Song Yu-e2, Liu Guo-dong1, Zhang Jie1, Zheng Jian-wei1   

  1. 1Department of Cardiovascular Surgery, Weifang People’s Hospital, Weifang 261041, Shandong Province, China; 2Qingdao Municipal Hospital, Medical College of Qingdao University, Qingdao 266011, Shandong Province, China
  • Received:2014-03-25 Online:2014-05-14 Published:2014-05-14
  • Contact: Song Yu-e, Associate chief physician, Qingdao Municipal Hospital, Medical College of Qingdao University, Qingdao 266011, Shandong Province, China
  • About author:Sun Zhong-dong, M.D., Master’s supervisor, Department of Cardiovascular Surgery, Weifang People’s Hospital, Weifang 261041, Shandong Province, China

摘要:

背景:近几年来研究发现内质网应激导致细胞凋亡在细胞缺血性损害中起重要作用,成为缺血心肌的研究热点。下肢缺血预处理对未成熟心肌具有明显保护作用,但下肢缺血预处理对未成熟心肌内质网应激细胞凋亡是否存在影响至今未知。
目的:探讨下肢缺血预处理对未成熟心肌内质网应激和细胞凋亡的影响。
方法:采用兔离体心脏Langendorff灌注模型,24只幼兔随机分为3组:对照组仅灌注KH液180 min;缺血再灌注组心脏灌注20 min后,停灌60 min,复灌100 min;下肢缺血预处理组,反复3次阻断双下肢血流5 min/放5 min,建立Langendorff模型,然后重复缺血再灌注组方法。TUNEL法检测心肌细胞凋亡率、Western blot检测GRP78、Bcl-2、Bax和Fas蛋白表达。
结果与结论:下肢缺血预处理组与缺血再灌注组比较,心肌细胞凋亡率明显减少;Bcl-2表达明显增多,GRP78、Bax、Fas表达明显减少。结果表明下肢缺血预处理可能通过调控内质网过度应激GRP78表达以及Bcl-2、Bax、Fas蛋白的表达调控心肌细胞凋亡。



中国组织工程研究
杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


全文链接:

关键词: 组织构建, 组织工程, 下肢缺血预处理, 内质网应激, 葡萄糖调节蛋白78, 细胞凋亡, B淋巴细胞瘤/白血病2蛋白

Abstract:

BACKGROUND: In recent years, endoplasmic reticulum stress-caused apoptosis plays a crucial role in ischemia impairment and has become the hotspot of studies addressing myocardial ischemia/reperfusion (I/R) injury. The lower limb ischemic preconditioning (LIP) has the obvious protective effect on the immature myocardium, but until now, no study reports whether LIP effects on endoplasmic reticulum stress apoptosis in immature myocardial cells.
OBJECTIVE: To investigate the effect of LIP on endoplasmic reticulum stress and apoptosis.
METHODS: Langendorff-perfused isolated rabbit hearts were used in this study. Twenty-four immature rabbits were randomized into three groups. Control group: Isolated rabbit heart was only perfused with Krebs-Henseleit for 180 minutes. I/R group: Isolated rabbit heart was perfused 20 minutes, and then ischemia for 60 minutes followed by reperfusion 100 minutes. LIP group: Limbs were repeatedly obstructed 5 minutes and relaxed 5 minutes for three times, to establish Langendorff models, and then repeated the method of ischemia/reperfusion in I/R group. The myocardial apoptosis was assayed with TUNEL method. The expression of glucose-regulated protein 78, Bcl-2, Bax and Fas was detected with western blot analysis.
RESULTS AND CONCLUSION: Compared with I/R group, apoptosis rate was significantly lower, the expression of Bcl-2 was significantly higher, and the expression of glucose-regulated protein 78, Bax and Fas was significantly lower in LIP group. This study demonstrated that LIP regulates myocardial cell apoptosis through 
reducing the expression of endopasmic reticulum stress GRP78, Bax and Fas and increasing the expression of Bcl-2.



中国组织工程研究
杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


全文链接:

Key words: lower extremity, ischemic preconditioning, myocytes, cardiac, apoptosis, endoplasmic reticulum

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