在衰老和PLN-R14del心肌病症中,DWORF的删除不会影响心脏功能
Nienke M Stege1, Vivian Oliveira Nunes Teixeira1, Sietske N Zijlstra1
1Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
American journal of physiology. Heart and circulatory physiology
|February 9, 2024
概括
删除矮人开放阅读框架 (DWORF) 基因不会使心肌病症恶化,这种心肌病症是由小鼠中的斯福兰班 (PLN) R14del变体引起的. 在老化过程中,DWORF对正常的心脏功能并不重要.
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
- 心脏病遗传模型的心脏病的遗传模型
背景情况:
- 索兰班 (PLN) p.Arg14del 变种导致心肌病和心力衰竭 (HF).
- 矮子开放阅读框架 (DWORF) 抵消了sarcoplasmic网膜中的PLN,并可以延迟PLN-R14del小鼠的疾病.
- 不知道DWORF缺失对PLN-R14del心肌病进展的影响.
研究的目的:
- 调查删除DWORF是否会在野生型 (WT) 和PLN-R14del小鼠中加速年龄相关心肌病.
- 为了确定DWORF是否对衰老期间的心脏功能至关重要.
主要方法:
- 产生和老化DWORF删除 (DWORF-/-) 鼠标和PLN-R14del (R14-/-) 鼠标,其中一些具有DWORF和R14删除的组合.
- 随着时间的推移,对心脏功能的评估,包括左心室喷射率 (LVEF).
- 对心脏重塑和纤维化的基因表达标记物的分析,以及对心脏纤维化的组织学评估.
主要成果:
- 与WT对照组相比,DWORF-/-小鼠在整个衰老过程中表现出正常的心脏功能和LVEF.
- R14-/-小鼠在18个月大时出现了减少的LVEF,但DWORF删除并没有加速这种下降.
- 缺少DWORF并没有增加心脏重塑,纤维化标志物或R14-/-小鼠的纤维化.
结论:
- 在小鼠中,DWORF删除不会加速或加剧PLN-R14del心肌病.
- 在老年老鼠中,DWORF对于维持心脏功能是不可或缺的.
- 德沃尔夫基因表达的变化不太可能解释人类PLN-R14del心肌病的临床变异性.
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