在PLN-R14del心肌病的小鼠模型中,心脏重塑途径不会加速疾病发病和严重程度
Liu Sun1, Elisabeth M Schouten1, Karla Arevalo Gomez1
1Department of Cardiology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
Scientific reports
|October 9, 2025
概括
横向大动脉收缩 (TAC) 引起的心脏压力过载并没有在索兰班 (PLN) -R14del小鼠模型中加速疾病. 常见的心脏应激途径本身不足以触发PLN-R14del心肌病.
科学领域:
- 心血管遗传学 心血管遗传学
- 分子心脏病学分子心脏病学
- 疾病建模 疾病建模
背景情况:
- 索兰班 (PLN) -R14del是一种致病变体,与心室节律失常和扩张性心肌病相关.
- 在PLN-R14del携带者中,疾病发病和严重程度呈现出高度的异质性,这表明其他因素也会影响疾病的进展.
研究的目的:
- 为了调查由横向大动脉收缩 (TAC) 引起的心脏压力过载是否会在异构的PLN-R14del小鼠模型 (R14Δ/+) 中加速疾病发作.
主要方法:
- 一个异构的PLN-R14del小鼠模型 (R14Δ/+) 接受了TAC手术以诱导压力过载.
- 野生类型的 littermates 和假操作的对照被用于比较.
- 手术后评估了心脏结构,功能,基因表达和肉质内质网膜完整性.
主要成果:
- 在R14Δ/+和野生型小鼠中,TAC诱导心脏重塑 (增加壁壁厚度,心室/心房重量,减少喷射分数).
- 基因表达分析显示,在两组中,心脏重塑和压力路径的激活是可比的.
- 重要的是,TAC并没有在R14Δ/+小鼠中诱导肉质内质网膜形,这表明PLN-R14del特异性病理没有被触发.
结论:
- 横向大动脉收缩引发了显著的心脏重塑,并激活了年轻成年小鼠的常见压力路径,无论PLN-R14del基因型.
- 在这个模型中,单独的压力过载不足以触发 PLN-R14del 特定的肉质内分泌网膜形或加速疾病的进展.
- 这些发现表明,常见的心脏应激途径并不是在成年早期加速PLN-R14del心肌病的唯一驱动因素.
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