相关实验视频

Updated: Jun 8, 2026

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart

High-frequency High-resolution Echocardiography: First Evidence on Non-invasive Repeated Measure of Myocardial Strain, Contractility, and Mitral Regurgitation in the Ischemia-reperfused Murine Heart

Published on: July 9, 2010

基因表达和超结构证据表明,在初级心脏吐中,代谢障碍存在

Mariame Selma Kane^1,2, Juan Xavier Masjoan Juncos¹, Shajer Manzoor¹

¹Division of Cardiovascular Disease, Heersink School of Medicine, University of Alabama at Birmingham (UAB), 1900 University Boulevard, Birmingham, AL 35233, USA.

European heart journal open

|June 10, 2024

概括

初级心肌吐 (PMR) 心脏表现出改变的新陈代谢,降低葡萄糖吸收和增加脂质储存,尽管保留了射出分数. 这种代谢转变可能会影响PMR患者的心脏功能.

科学领域:

心脏病学心脏病学
分子生物学分子生物学
代谢研究研究代谢研究

背景情况:

慢性神经激素激活和血液动力负荷在初级心肌回 (PMR) 可以改变心肌基质利用.
在PMR中保存的左心室喷射分数 (LVEF) 可能会掩盖潜在的代谢失调.

研究的目的:

调查PMR心脏表现出改变的代谢基因配置和心脏超结构的假设.
评估这些变化是否与脂肪酸和葡萄糖代谢下降相一致,尽管保持了LVEF (>60%).

主要方法:

对于代谢基因表达 (例如,GLUT4,hexokinase2) 的心房和心室活检的分析.
定量传输电子显微镜用于评估心脏的超结构 (例如,糖原,脂质滴,线粒体).
测量心周液中神经Y和血生物标志物 (例如HbA1C,自由脂肪酸).
心脏MRI和2-deoxy-2-[18F]-D-葡萄糖 (FDG) PET成像. 心脏MRI和2-deoxy-2-[18F]-D-葡萄糖 (FDG) PET成像.

主要成果:

PMR心脏显示葡萄糖载体 (GLUT4,GLUT1) 和胰岛素受体基质2的mRNA减少.
在PMR中观察到对hexokinase 2和hexosamine生物合成途径的mRNA增加.
超结构分析揭示了PMR中的糖原积累,脂质滴滴增加和线粒体损伤.
PMR患者表现出更高的心周神经Y和更高的血自由脂肪酸和HbA1C.
在PMR患者中观察到LV [18F]FDG吸收的减少,这些患者的LVEF保持.

结论:

PMR心脏显示了超结构和代谢基因表达的全球转变,其特点是葡萄糖吸收减少,葡萄糖和脂质滴积累增加.
需要进一步的研究来确定这些代谢变化是否代表PMR的适应或不适应.
这些发现对PMR的临床评估和管理有影响.

关键词:

脂质和葡萄糖的新陈代谢.线粒体功能障碍线粒体功能障碍主要的 mitra 反.[18F]FDG-PET/CMRR是什么意思

更多相关视频

Optimized Protocol for the Extraction of Proteins from the Human Mitral Valve

Optimized Protocol for the Extraction of Proteins from the Human Mitral Valve

Published on: June 14, 2017

An Image Guided Transapical Mitral Valve Leaflet Puncture Model of Controlled Volume Overload from Mitral Regurgitation in the Rat

An Image Guided Transapical Mitral Valve Leaflet Puncture Model of Controlled Volume Overload from Mitral Regurgitation in the Rat

Published on: May 19, 2020

相关概念视频

Mitral Valve Prolapse I: Introduction

Mitral Valve Prolapse I: Introduction

IntroductionThe mitral valve, one of the heart's four valves, regulates blood flow. These valves have flaps that open and close to direct blood properly through the heart and body. During each heartbeat, the flaps open for blood to pass through and seal shut to prevent backflow. Specifically, the mitral valve opens to allow blood flow from the heart's upper left chamber to the lower left chamber. It then closes securely as the lower left chamber contracts to pump blood to the body, preventing...

Mitral Regurgitation I: Introduction

Mitral Regurgitation I: Introduction

Mitral regurgitation is characterized by the backward circulation of blood from the left ventricle to the left atrium during systole, a phase of the cardiac cycle when the heart contracts and pumps blood out of the chambers. This abnormal flow occurs primarily due to the dysfunction of the mitral valve or its supporting structures, which include the mitral leaflets, chordae tendineae, annulus, and papillary muscles.Etiology and Mechanisms:Primary Mitral Regurgitation: This type arises from...

Mitral Regurgitation II: Clinical Features and Diagnostic Tests

Mitral Regurgitation II: Clinical Features and Diagnostic Tests

Mitral regurgitation (MR) is a valvular heart disorder in which the mitral valve fails to close tightly, allowing blood to leak backward into the heart. Understanding the clinical manifestations, assessment, diagnostic findings, and medical management of MR is crucial to effectively managing affected patients.Clinical Manifestations of Mitral RegurgitationMitral regurgitation can be acute or chronic, each presenting differently and requiring different approaches:1. Acute Mitral...

Mitral Regurgitation III: Medical Management

Mitral Regurgitation III: Medical Management

Mitral regurgitation (MR) is characterized by retrograde blood circulation from the left ventricle into the left atrium due to inadequate mitral valve closure. The severity of the condition, symptoms, and underlying cause determine treatment strategies.Monitoring and Pharmacological TreatmentPatients with mild to moderate MR typically do not need immediate intervention but regular monitoring to assess progression and guide treatment. Patients with mild MR should have an echocardiogram every 3-5...

Mitral Regurgitation IV: Nursing Management

Mitral Regurgitation IV: Nursing Management

Mitral regurgitation (MR) is a condition where the mitral valve does not close properly, leading to the backward flow of blood from the left ventricle into the left atrium during systole. This condition can arise from various causes, including rheumatic fever, infective endocarditis, or degenerative valve disease. Effective nursing management is crucial to optimizing patient outcomes and involves comprehensive assessment and targeted interventions.Comprehensive Patient AssessmentA detailed...

Mitral Stenosis II: Clinical features and Diagnostic Tests

Mitral Stenosis II: Clinical features and Diagnostic Tests

Mitral stenosis is a heart condition in which the mitral valve, which allows blood to flow from the left atrium to the left ventricle, becomes narrowed or stenotic. This narrowing hinders blood flow and leads to clinical symptoms requiring specific medical evaluations and management strategies. The following overview outlines the clinical symptoms, assessments, diagnostic findings, prevention methods, and treatments for mitral stenosis.Clinical ManifestationsDyspnea (shortness of breath): This...