激活p38γ/δ会改变心脏的电活动,并导致心室节律失常
Rafael Romero-Becerra1, Francisco M Cruz1, Alfonso Mora1
1Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain.
Nature cardiovascular research
|August 28, 2024
概括
老龄化增加了心室动 (VF) 的风险. 在老年心脏中,压力激酶p38γ和p38δ的激活通过破坏处理来促进VF. 阻止这种途径为VF预防提供了潜在的治疗策略.
科学领域:
- 心脏病学 心脏病学
- 分子生物学分子生物学
- 老年学是一门学科.
背景情况:
- 心室动 (VF) 是心脏突然死亡的主要原因.
- 老龄化与风险增加密切相关,但潜在的机制仍然难以捉摸.
- 由于机制不清楚,用于预防VF的向疗法是有限的.
研究的目的:
- 研究应激激酶p38γ和p38δ在与年龄相关的心室动中所起的作用.
- 阐明这些激酶对VF易感性有所贡献的分子机制.
主要方法:
- 在老年小鼠中激活压力激酶p38γ和p38δ以及心律失常条件的模型.
- 对氨酸受体2 (RyR2) 酸化和Kv4.3通道局部化的分析.
- 评估细胞内的处理,作用潜力的持续时间和对VF的敏感性.
主要成果:
- 在老年心室和促进心律失常的条件下,p38γ和p38δ激酶被激活.
- 激活的p38γ和p38δ通过酸化RyR2和破坏Kv4.3通道局部化来促进VF.
- 这导致泄漏,减少I到电流,延长动作潜力的持续时间,并增加VF易感性.
结论:
- 激活p38γ和p38δ有助于与年龄相关的和压力诱导的心室动.
- 准p38γ/p38δ通路可能为VF预防提供一种新的治疗策略.
- 阻断这种途径显示出对VF发育和持续时间的保护作用.
相关概念视频
01:21G-Protein Gated Ion Channels
4.5K
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
Sensory...
4.5K
01:19Electrophysiology of Normal Cardiac Rhythm
2.4K
The normal cardiac rhythm is a synchronized electrical activity that facilitates the regular and coordinated contraction of the heart muscle. This process is essential for efficient blood circulation throughout the body. The fundamental elements involved in establishing and maintaining this rhythm include the unique electrical properties of cardiac muscle cells, the sinoatrial (SA) node's pacemaker function, the specialized conducting system, and the ionic mechanisms underlying each phase...
2.4K
01:30Cardiac Action Potential
1.1K
Cardiac action potentials are essential for proper heart function, enabling the rhythmic contractions needed for adequate blood circulation. Nodal cells and Purkinje fibers, specialized for electrical conduction, generate these action potentials.
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
The cardiac action potential process involves a series of phases characterized by the movement of ions across the cardiac cell membranes, leading to the depolarization and repolarization of the cardiac myocytes.
Ionic Basis of Cardiac Action Potentials
1.1K
01:28Mechanism of Cardiac Arrhythmias
901
Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.
901
01:25Correlation between ECG and Cardiac Cycle
3.6K
The electrical signals recorded on an electrocardiogram (ECG) occur before the mechanical processes of contraction and relaxation during the cardiac cycle.
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
A cardiac action potential originates in the SA node and spreads throughout the atria and the AV node in approximately 0.03 seconds. This results in the P wave in an ECG and triggers atrial contraction. The action potential is then briefly slowed at the AV node, allowing the atria to contract and fill the ventricles with blood before...
3.6K