通过改善心脏脂肪毒性,防止HFpEF的出现和发展
Oveena Fonseka1, Rida Raja1, Claire Ross1
1Faculty of Biology, Medicine and Health, The University of Manchester, UK (O.F., R.R., C.R., S.R.G., J.Z., K.K., A.R.-V., N.K., X.C., Z.Z., X.Z., E.S., M.R.P., T.W., L.V., C.P., M.K.R., B.D.K., E.J.C., T.M.A.M., W.L.).
Circulation
|March 25, 2025
概括
研究人员确定EDEM2 (增强内质网膜降解的α-曼诺酶样蛋白2) 是心脏脂质稳定的一个关键调节剂. 恢复EDEM2或XBP1可以预防和治疗心力衰竭与保存的喷射分数 (HFpEF) 在代谢障碍.
科学领域:
- 心血管生物学
- 代谢疾病
- 分子心脏病学
背景情况:
- 心脏衰竭与保存的喷射分数 (HFpEF) 呈现出显著的发病率和死亡率,特别是在代谢障碍患者中.
- 预防和治疗HFpEF结果的治疗选择有限,强调需要新的策略.
- 心脏内脂毒性是与代谢压力相关的HFpEF中心脏功能障碍的关键因素.
研究的目的:
- 研究EDEM2 (增强内分泌网膜降解的α- mannosidase-like蛋白2) 在调节心脏脂质平衡中的作用.
- 探索针对EDEM2的治疗策略,以预防和治疗HFpEF.
- 阐明将代谢压力,脂毒性和心脏功能障碍联系在一起的分子机制.
主要方法:
- 在C57BL/6小鼠中使用高脂肪饮食和L-NAME诱导的代谢压力模型.
- 在基因丧失和功能增加研究中使用腺相关病毒9.
- 使用脂质刺激,RNA测序,蛋白质组学,脂质组学和电子显微镜研究心肌细胞中的机制.
主要成果:
- 在人类和小鼠心脏中,代谢压力导致心脏脂质过载和XBP1 (X-box结合蛋白1) 的降低.
- 在HFpEF心脏中,XBP1s (拼接X盒结合蛋白1) 的目标EDEM2降低.
- EDEM2 缺乏症加剧了脂毒性和HFpEF 进展,而其恢复则通过ATGL (脂肪三糖 lipase) 转位改善了这些影响.
结论:
- 证明了一种涉及EDEM2的新型心脏保护机制来调节心肌脂质稳定.
- 确定心脏XBP1s和EDEM2恢复为预防和治疗HFpEF的有希望的治疗点.
- 提供了代谢压力,脂毒性和HFpEF之间的机制联系,为干预提供了新的途径.
相关概念视频
01:17Pathophysiology of Heart Failure
1.4K
Heart failure (HF) is a progressive syndrome involving ventricles that leads to inadequate cardiac output. It can be classified based on location and output or ejection fraction. Ejection fraction (EF) is an essential measurement in the diagnosis and surveillance of HF. Reduced EF corresponds to systolic heart failure (HFrEF). However, HF with preserved ejection fraction (HFpEF) is becoming increasingly prevalent. Also known as diastolic HF, this form of HF is related to aging. The...
1.4K
01:26Heart Failure Drugs: Inhibitors of Renin-Angiotensin System
354
The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
354
01:58Cell Specific Gene Expression
13.3K
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
13.3K
01:18Treatment for Pulmonary Arterial Hypertension: Endothelin Receptor Antagonists
118
Endothelins (ETs) are potent vasoactive peptides critical in the human body's various physiological and pathological processes. One of the most promising therapeutic strategies for treating pulmonary arterial hypertension (PAH) involves counteracting the effects of these endothelins using a class of drugs known as endothelin receptor antagonists.
ETs are synthesized through a complex sequence of enzymatic steps, primarily involving an enzyme referred to as endothelin-converting enzyme...
ETs are synthesized through a complex sequence of enzymatic steps, primarily involving an enzyme referred to as endothelin-converting enzyme...
118