中国组织工程研究 ›› 2022, Vol. 26 ›› Issue (5): 730-735.doi: 10.12307/2022.119

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

粒细胞集落刺激因子改善急性心肌梗死模型大鼠的心肌纤维化

殷婷婷1,杜大勇2,蒋知新2,柳  杨2,刘奇林1,李运田1,2   

  1. 1南方医科大学第二临床医学院,广东省广州市   510000;2中国人民解放军第305 医院心脏中心,北京市   100000
  • 收稿日期:2021-02-25 修回日期:2021-02-27 接受日期:2021-04-12 出版日期:2022-02-18 发布日期:2021-11-02
  • 通讯作者: 李运田,博士,主任医师,南方医科大学第二临床医学院,广东省广州市 510000;中国人民解放军第305 医院心脏中心,北京市 100000
  • 作者简介:殷婷婷,女,1993年生,湖北省黄冈市人,汉族,2021年南方医科大学毕业,硕士,主要从事冠心病、心肌纤维化方面的研究。
  • 基金资助:
    全军冠心病诊疗中心建设资助项目(09GXB),项目负责人:李运田;国家自然科学基金资助项目(30971235),项目参与人:蒋知新

Granulocyte colony-stimulating factors improve myocardial fibrosis in rats with myocardial infarction

Yin Tingting1, Du Dayong2, Jiang Zhixin2, Liu Yang2, Liu Qilin1, Li Yuntian1, 2    

  1. 1The Second School of Clinical Medicine, Southern Medical University, Guangzhou 510000, Guangdong Province, China; 2The 305th Hospital of Chinese PLA, Beijing 100000, China 
  • Received:2021-02-25 Revised:2021-02-27 Accepted:2021-04-12 Online:2022-02-18 Published:2021-11-02
  • Contact: Li Yuntian, MD, Chief physician, The Second School of Clinical Medicine, Southern Medical University, Guangzhou 510000, Guangdong Province, China; The 305th Hospital of Chinese PLA, Beijing 100000, China
  • About author:Yin Tingting, Master, The Second School of Clinical Medicine, Southern Medical University, Guangzhou 510000, Guangdong Province, China
  • Supported by:
    the Military Coronary Heart Disease Diagnosis and Treatment Center Construction Project, No. 09GXB (to LYT); the National Natural Science Foundation of China, No. 30971235 (to JZX [project participant]) 

摘要:

文题释义:
心肌纤维化:是心肌重构的主要表现之一,是多种疾病过程的共同病理结果,通常表现为心脏组织中心肌成纤维细胞的病理性增多和心肌细胞外基质的异常沉积,从而导致心肌室壁僵硬度增加,顺应性降低,心脏功能减退,最后出现充血性心力衰竭。
粒细胞集落刺激因子:是一种作用于中性粒细胞系造血细胞增殖、分化和活化的糖蛋白,临床主要用于预防和治疗肿瘤放疗或化疗后引起的血液性疾病。近年来由于其可以减少胶原纤维的生成,有效改善心肌纤维化,在心血管病领域备受关注。


背景:粒细胞集落刺激因子作为一种强效干细胞动员剂,在心肌梗死早期使用可以动员骨髓间充质干细胞至心肌梗死缺血区,调控细胞外基质代谢,抑制心肌纤维化。
目的:观察粒细胞集落刺激因子对急性心肌梗死大鼠心肌纤维化的影响。
方法:冠状动脉结扎法建立大鼠急性心肌梗死模型,建模成功的大鼠随机分为模型对照组及治疗组(n=7),另外取7只大鼠仅穿线,不结扎,作为空白对照组。治疗组于建模后24 h皮下注射粒细胞集落刺激因子[50 μg/(kg•d)],模型对照组和空白对照组均于相同部位注射相应体积生理盐水,1 次/d,共5 d。4 周后,苏木精-伊红染色观察心肌组织形态学变化,Masson 染色计算胶原容积分数,ELISA法检测血清Ⅰ型前胶原羧基端肽和Ⅲ型前胶原氨基端肽含量,免疫组织化学法和蛋白免疫印迹法(Western blot)检测大鼠心肌梗死边缘区基质金属蛋白酶诱导剂CD147及基质金属蛋白酶2、基质金属蛋白酶抑制剂2蛋白表达水平。
结果与结论:①4 周后,与空白对照组相比,模型对照组胶原容积分数明显增加(P < 0.001),CD147、基质金属蛋白酶2蛋白水平明显升高 (P < 0.001),基质金属蛋白酶抑制剂2蛋白水平明显降低;②与模型对照组相比,治疗组胶原容积分数明显降低(P < 0.001),CD147、基质金属蛋白酶2蛋白水平明显降低(P < 0.001),基质金属蛋白酶抑制剂2蛋白水平明显增加(P < 0.001);③与空白对照组相比,模型对照组的Ⅰ型前胶原羧基端肽、Ⅲ型前胶原氨基端肽表达水平明显增加(P < 0.001);与模型对照组相比,治疗组的Ⅰ型前胶原羧基端肽、Ⅲ型前胶原氨基端肽表达水平明显降低(P < 0.001);④提示粒细胞集落刺激因子可改善急性心肌梗死大鼠心肌纤维化,可能是通过下调CD147蛋白的表达水平,直接或间接调控基质金属蛋白酶2/基质金属蛋白酶抑制剂2比例平衡、改善细胞外基质代谢、抑制胶原沉积从而发挥作用。
缩略语:粒细胞集落刺激因子:granulocyte colony-stimulating factor,G-CSF;Ⅰ型前胶原羧基端肽:type I procollagen carboxyl terminal peptide,PⅠCP;Ⅲ型前胶原氨基端肽:type Ⅲ procollagen amino terminal peptide,PⅢNP

https://orcid.org/0000-0002-5837-9784 (殷婷婷) 

关键词: 心肌梗死, 心肌纤维化, 粒细胞集落刺激因子, CD147, 基质金属蛋白酶2, 基质金属蛋白酶抑制剂2

Abstract: BACKGROUND: As a powerful stem cell mobilization agent, granulocyte colony-stimulating factor can mobilize bone marrow mesenchymal stem cells to the ischemic area in the early stage of myocardial infarction, regulate extracellular matrix metabolism and inhibit myocardial fibrosis in the early stage of myocardial infarction.
OBJECTIVE: To observe the effect of granulocyte colony-stimulating factor on myocardial fibrosis in rats with acute myocardial infarction.
METHODS: Animal models of acute myocardial infarction were established in rats by coronary artery ligation. After successful modeling, the rats were randomly divided into two groups: model group (n=7) and treatment group (n=7). Another seven rats were randomly selected as blank control group without ligation. At 24 hours after modeling, the treatment group was subcutaneously injected with granulocyte colony-stimulating factor (50 μg/kg/d). Both the model group and the blank control group were injected with the corresponding volume of normal saline at the same site, once a day for 5 days. After 4 weeks, the morphological changes of myocardial tissue were observed by hematoxylin-eosin staining, and the collagen volume fraction was calculated by Masson staining. The levels of serum type I procollagen carboxyl terminal peptide and type III procollagen N-terminal peptide were detected by ELISA assay. The protein expressions of matrix metalloproteinase inducer (CD147), matrix metalloproteinase 2 and matrix metalloproteinase inhibitor 2 in the marginal zone of myocardial infarction were detected by immunohistochemistry and western blot. 
RESULTS AND CONCLUSION: After 4 weeks, the volume fraction of collagen was significantly higher in the model group than in the blank control group (P < 0.001), the protein levels of CD147 and matrix metalloproteinase 2 were significantly increased (P < 0.001), and the level of matrix metalloproteinase inhibitor 2 protein was significantly decreased. Compared with the model group, the collagen volume fraction in the treatment group decreased significantly (P < 0.001), the protein levels of CD147 and matrix metalloproteinase 2 decreased (P < 0.001), and the level of matrix metalloproteinase inhibitor 2 protein increased significantly (P < 0.001). Compared with the blank control group, the expression levels of serum type I procollagen carboxyl terminal peptide and type III procollagen N-terminal peptide significantly increased in the treatment group (P < 0.001). Compared with the model group, the expression levels of serum type I procollagen carboxyl terminal peptide and type III procollagen N-terminal peptide reduced significantly in the treatment group (P < 0.001). To conclude, granulocyte colony-stimulating factor can improve myocardial fibrosis in rats with acute myocardial infarction, probably by down-regulating the expression of CD147 protein, directly or indirectly regulating the balance of matrix metalloproteinase 2/matrix metalloproteinase inhibitor 2 ratio, improving extracellular matrix metabolism and inhibiting collagen deposition.

Key words: myocardial infarction, myocardial fibrosis, granulocyte colony-stimulating factor, CD147, matrix metalloproteinase 2, matrix metalloproteinase inhibitor 2

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