与肥胖相关的HFpEF中心脏的代谢失调
Maria Valero-Muñoz1, Hannah L Cooper1, Shanpeng Li1
1Whitaker Cardiovascular Institute, Boston University Chobanian & Avedisian School of Medicine, Boston, MA, United States.
Frontiers in cardiovascular medicine
|October 13, 2025
概括
心脏衰竭中的肥胖与保存的喷射分数 (HFpEF) 具有不同的心脏影响,取决于胰岛素抵抗 (IR). 代谢健康的肥胖小鼠显示心脏纤维化减少,这表明SIRT3是HFpEF的潜在治疗标.
科学领域:
- 心血管生物学 心血管生物学
- 代谢疾病 代谢疾病
- 线粒体医学 线粒体医学
背景情况:
- 肥胖和高血压在心力衰竭中很常见,其中保留了喷射分数 (HFpEF).
- 肥胖与胰岛素抵抗 (IR) 和2型糖尿病 (T2D) 有关,但对心脏的影响尚不清楚.
- 这项研究区分了肥胖的HFpEF与IR和没有IR的心脏表现型.
研究的目的:
- 在HFpEF中研究肥胖对心脏的影响,区分代谢健康 (非IR) 和胰岛素抵抗状态.
- 探索线粒体适应和SIRT3在肥胖HFpEF中的作用.
主要方法:
- 使用脂肪组织特异性的MitoNEET转基因小鼠 (肥胖非胰岛素耐药,OB-NIR) 和野生类型的 littermates (肥胖胰岛素耐药,OB-IR).
- 小鼠被食高脂肪饮食,随后接受了HFpEF诱导 (非腎切除术,阿尔多斯特,高盐).
- 分析了心脏表型,纤维化,高和线粒体基因表达.
主要成果:
- 在OB-NIR HFpEF小鼠中,心脏纤维化减少,没有显著的缩.
- 在OB-NIR HFpEF小鼠中观察到心脏SIRT3表达的增加,以及改变的线粒体动态 (例如,Fis1上调) 和抗氧化途径 (例如,Hmox1上调).
- 线粒体电子运输链基因在OB-NIR HFpEF小鼠中被上调.
结论:
- 心脏线粒体功能在肥胖的HFpEF中因IR状态而有所不同.
- 在代谢健康的肥胖HFpEF中,SIRT3在调解心脏线粒体适应方面发挥着关键作用.
- SIRT3代表了HFpEF的一个潜在的治疗点.
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