化抑制了未折叠的蛋白质反应,以防止产周心肌病
Varsha Tandra1, Lingxian Zhang1, Chang Min Lee1
1Vascular Biology Center, Medical College of Georgia, Augusta University, Augusta, Georgia, USA.
JACC. Basic to translational science
|July 31, 2025
概括
蛋白质修饰的基化对心脏健康至关重要. 扰乱心脏中的UFM1结合酶1 (UFL1) 会导致周周心肌病,因为它会引起压力和代谢功能障碍.
科学领域:
- 心血管生物学 心血管生物学
- 分子和细胞生物学分子和细胞生物学
- 生物化学 生物化学
背景情况:
- 乌夫mylation是一种类似于ubiquitin的蛋白质修饰,对于组织平衡至关重要.
- 化在心脏功能和疾病中的特定作用仍然在很大程度上是未知的.
- 产前心肌病是一种严重的心力衰竭形式,在怀孕期间或产后影响妇女.
研究的目的:
- 为了研究乌夫米拉在心脏中的作用.
- 确定UFM1结合酶1 (UFL1) 缺乏对心脏生理学和病理学的影响.
- 阐明乌夫米लेशन影响心脏重塑和心力衰竭的机制.
主要方法:
- 生成特定于心脏的UFL1淘汰赛小鼠模型.
- 使用心声学和组织学分析心脏功能和结构.
- 评估内质网膜应激,线粒体新陈代谢和mTOR信号通路.
- 转录组分析以确定改变的基因表达模式.
主要成果:
- 在小鼠中,心脏特异性UFL1丧失导致周周心肌病.
- UFL1缺乏逆转了与怀孕相关的适应性心脏变化.
- 抑制乌夫mylation导致增加了内分泌网膜应激,损害了线粒体的氧化代谢,并增加了mTOR信号.
- 这些分子变化促进了病态心脏重塑和心力衰竭.
结论:
- 在怀孕期间的生理心脏重塑过程中,肌化是不可或缺的.
- 化通路的破坏使心脏易患周周心肌病.
- 向化可能为预防或治疗心力衰竭提供新的治疗策略.
相关概念视频
01:37The Unfolded Protein Response
5.1K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
5.1K
01:31Regulation of the Unfolded Protein Response
2.6K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.6K
01:29Cardiomyopathy IV: Restrictive Cardiomyopathy
33
Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...
33
01:29Cardiomyopathy III: Hypertrophic Cardiomyopathy
52
Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
52
02:27Nonsense-mediated mRNA Decay
10.8K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
10.8K
01:29Cardiomyopathy V: Interprofessional Care
34
Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
34