准确医学之路:解读心房扩大生理和病理的秘密
Shuai Zhao1,2, Xander H T Wehrens1,2,3,4,5,6
1Cardiovascular Research Institute, Baylor College of Medicine, Houston, TX 77030, U.S.A.
Clinical science (London, England : 1979)
|September 18, 2024
概括
由于胰岛素样生长因子1受体 (IGF1R) 过度表达,小鼠的心房生理扩大,保持了心房功能. 从主导阴性PI3K (dn-PI3K) 突变过度表达功能损伤和纤维化增加的病理重塑.
科学领域:
- 心血管生物学 心血管生物学
- 分子心脏病学分子心脏病学
- 翻译医学是一种翻译医学.
背景情况:
- 心脏重塑涉及到心脏结构和功能的变化.
- 胰岛素样生长因子1受体 (IGF1R) 和PI3K信号通路在心脏生理学和病理学中发挥着关键作用.
- 了解心房重塑机制对于开发向疗法至关重要.
研究的目的:
- 研究生理学和病理学心房改造的独特功能和分子概况.
- 为了比较转基因小鼠模型的蛋白质特征与健康和患病的人类心房.
主要方法:
- 对两个转基因小鼠模型进行了心脏功能,形态和组织学分析.
- 液体染色学和质谱学被用于蛋白质分子分析.
- 进行左心房 (LA) 鉴定,包括射出分数 (EF) 评估.
主要成果:
- 过度表达IGF1R导致心房生理扩大,肌细胞大小增加,并保持LA EF.
- 过度表达DCM-dnPI3K导致有纤维化特征的病态心房扩大,肌细胞大小正常,并减少LA EF.
- 蛋白质组分析揭示了不同的特征:IGF1R Tg小鼠显示的代谢重塑类似于健康的人类心房,而DCM-dnPI3K小鼠显示的代谢和结构重塑类似于人类AF心房.
结论:
- 由IGF1R驱动的生理性心房重塑与心房功能保留和独特的蛋白质组形状有关.
- 由dn-PI3K驱动的病理性心房重塑导致心房功能受损,纤维化和类似人类心房动的蛋白质特征.
- 这些发现突显了信号通路对心房重塑的差异影响,并提供了对人类心房疾病的见解.
更多相关视频
08:56Sterile Pericarditis in Aachener Minipigs As a Model for Atrial Myopathy and Atrial Fibrillation
Published on: September 24, 2021
2.6K
08:10Estimating Bilateral Atrial Function by Cardiovascular Magnetic Resonance Feature Tracking in Patients with Paroxysmal Atrial Fibrillation
Published on: July 20, 2022
1.6K
相关概念视频
01:27Anatomy of the Heart
93.3K
The human heart is made up of three layers of tissue that are surrounded by the pericardium, a membrane that protects and confines the heart. The outermost layer, closest to the pericardium, is the epicardium. The pericardial cavity separates the pericardium from the epicardium. Beneath the epicardium is the myocardium, the middle layer, and the endocardium, the innermost layer. There are four chambers of the heart: the right atrium, the right ventricle, the left atrium, and the left ventricle.
93.3K
01:29Pathophysiology of Cardiac Performance
2.2K
Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
2.2K
01:17Pathophysiology of Heart Failure
4.8K
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...
4.8K
01:16Heart Valves
14.9K
The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...
14.9K
01:20Anatomy of the Heart
6.0K
The heart is a hollow, muscular organ approximately the size of a fist, consisting of four chambers. It is enclosed in the pericardium, a fibrous sac with two layers: the visceral and parietal pericardium, separated by a fluid-filled space containing serous fluid to reduce friction.
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...
The heart has three layers: the innermost endocardium, the muscular myocardium, and the outer epicardium, all working together for optimal cardiac function.
Chambers of the Heart
The heart is made up of four...
6.0K
01:29Heart Failure II: Pathophysiology
1.9K
Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
1.9K