探索放松肌肉素状态与ANrep效应之间的联系
Vasco Sequeira1, Christoph Maack1, Gert-Hinrich Reil2
1Department of Translational Science Universitätsklinikum, Deutsche Zentrum für Herzinsuffizienz (DZHI), Würzburg, Germany (V.S., C.M.).
Circulation research
|January 4, 2024
概括
Anrep效应是对后负载增加的心脏反应,涉及肌肉素从超放松 (SRX) 过渡到无序放松 (DRX) 状态. 这种肌平衡的转变是理解收缩性和多变性心肌病的关键.
科学领域:
- 心脏病学 心脏病学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- Anrep效应在增加后负载后增强左心室收缩性,但其机制尚不清楚.
- 肌氨酸在心脏收缩性中的作用是核心的,其放松状态 (超放松SRX和无序放松DRX) 影响力产生.
- 超性心肌病 (HCM) 涉及透支功能障碍,超收缩性和左心室缩,通常与肌失调有关.
研究的目的:
- 提出一个统一的假设,将肌的SRX-DRX平衡与Anrep效应联系起来.
- 通过肌肉素状态过渡来探索Anrep效应的细胞基础.
- 为了识别高压阻塞性心肌病 (HOCM) 中的临床ANREP指纹及其潜在的逆转.
主要方法:
- 使用了非侵入性的心声回声学压力-体积测量.
- 分析了末压力-体积关系 (ESPVR).
- 测量了根据心率调整后的缩喷射时间.
主要成果:
- 在12名HOCM患者的临床ANREP指纹中显示出前去除.
- 通过向左和更的ESPVR观察到增强的收缩性.
- 发现一个延长的,心率调整的缩喷射时间,逆转了后剥离.
结论:
- Anrep效应的机制涉及肌从SRX过渡到DRX状态.
- 肌蛋白SRX-DRX平衡的调节失调可能是病理Anrep现象的基础,例如HCM超收缩性.
- 在HOCM中存在一个独特的Anrep指纹,为各种心肌病提供了潜在的诊断和治疗见解.
相关概念视频
Relaxation of Skeletal Muscles
3.2K
The period of muscle contraction primarily influences the duration of stimulation at the neuromuscular junction (NMJ), the presence of free calcium ions in the sarcoplasm, and the availability of energy or ATP to support contractions.
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
When an action potential reaches the axon terminal, it depolarizes the membrane and opens voltage-gated sodium channels. Sodium ions enter the cell, further depolarizing the presynaptic membrane. This depolarization causes voltage-gated calcium channels to open....
3.2K
Actin and Myosin in Muscle Contraction
11.4K
Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
11.4K
The Role of Actin and Myosin in Non-muscle Cells
3.5K
Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They are held...
3.5K
Cross-bridge Cycle
117.5K
As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.
117.5K
Generation of Straight or Branched Actin Filaments
2.9K
The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
2.9K
Overview of Myosin Structure and Function
4.3K
Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X) have been well...
4.3K


