肌节
收缩性
心脏病学
心室
肌丝
内科学
心房颤动
基因亚型
医学
心肌细胞
生物
遗传学
基因
作者
Hope Burnham,Hannah E Cizauskas,David Y. Barefield
出处
期刊:American Journal of Physiology-heart and Circulatory Physiology
[American Physiological Society]
日期:2024-03-01
卷期号:326 (3): H568-H583
被引量:1
标识
DOI:10.1152/ajpheart.00252.2023
摘要
The molecular mechanisms of sarcomere proteins underlie the contractile function of the heart. Although our understanding of the sarcomere has grown tremendously, the focus has been on ventricular sarcomere isoforms due to the critical role of the ventricle in health and disease. However, atrial-specific or -enriched myofilament protein isoforms, as well as isoforms that become expressed in disease, provide insight into ways this complex molecular machine is fine-tuned. Here, we explore how atrial-enriched sarcomere protein composition modulates contractile function to fulfill the physiological requirements of atrial function. We review how atrial dysfunction negatively affects the ventricle and the many cardiovascular diseases that have atrial dysfunction as a comorbidity. We also cover the pathophysiology of mutations in atrial-enriched contractile proteins and how they can cause primary atrial myopathies. Finally, we explore what is known about contractile function in various forms of atrial fibrillation. The differences in atrial function in health and disease underscore the importance of better studying atrial contractility, especially as therapeutics currently in development to modulate cardiac contractility may have different effects on atrial sarcomere function.
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