A transcriptomic analysis of correlation between mitochondrial function and energy metabolism remodeling in mice with myocardial fibrosis following myocardial infarction
10.12122/j.issn.1673-4254.2024.04.07
- VernacularTitle:心肌梗死后心肌纤维化小鼠心肌线粒体功能和能量代谢重塑相关性的转录组学分析
- Author:
Zining WANG
1
,
2
;
Ming YANG
;
Shuanglei LI
;
Haitao CHI
;
Junhui WANG
;
Cangsong XIAO
Author Information
1. 解放军医学院,北京 100853
2. 解放军总医院第六医学中心心血管外科,北京 100037
- Keywords:
transcriptomics;
myocardial infarction;
myocardial fibrosis;
mitochondria;
glycolysis;
cardiac fibroblasts
- From:
Journal of Southern Medical University
2024;44(4):666-674
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the changes of mitochondrial respiratory function during myocardial fibrosis in mice with myocardial infarction (MI) and its correlation with the increase of glycolytic flux. Methods Forty C57BL/6N mice were randomized into two equal groups to receive sham operation or ligation of the left anterior descending coronary artery to induce acute MI. At 28 days after the operation, 5 mice from each group were euthanized and left ventricular tissue samples were collected for transcriptomic sequencing. FPKM method was used to calculate gene expression levels to identify the differentially expressed genes (DEGs) in MI mice, which were analyzed using GO and KEGG databases to determine the pathways affecting the disease process. Heat maps were drawn to show the differential expressions of the pathways and the related genes in the enrichment analysis. In primary cultures of neonatal mouse cardiac fibroblasts (CFs), the changes in mitochondrial respiration and glycolysis levels in response to treatment with the pro-fibrotic agonist TGF-β1 were analyzed using Seahorse experiment. Results The mouse models of MI showed significantly increased diastolic and systolic left ventricular diameter (P<0.05) and decreased left ventricular ejection fraction (P<0.0001). A total of 124 up-regulated and 106 down-regulated DEGs were identified in the myocardial tissues of MI mice, and GO and KEGG enrichment analysis showed that these DEGs were significantly enriched in fatty acid metabolism, organelles and other metabolic pathways and in the mitochondria. Heat maps revealed fatty acid beta oxidation, mitochondrial dysfunction and increased glycolysis levels in MI mice. In the primary culture of CFs, treatment with TGF-β1 significantly reduced the basal and maximum respiratory levels and increased the basal and maximum glycolysis levels (P<0.0001). Conclusion During myocardial fibrosis, energy metabolism remodeling occurs in the CFs, manifested by lowered mitochondrial function and increased energy generation through glycolysis.
