心脏交感神经元是受遗传决定性心律失常性心肌病影响的额外细胞
Induja Perumal Vanaja1,2, Arianna Scalco2,3, Marco Ronfini2,3
1Department of Cardiac, Thoracic, Vascular Sciences and Public Health, University of Padova, Padova, Italy.
The Journal of physiology
|August 14, 2024
概括
节律失调性心肌病 (AC) 是一种与德斯莫格林-2 (DSG2) 突变相关的遗传性心脏病. 这项研究表明,改变的DSG2会影响交感神经元,导致心脏内置异常,并导致AC病变.
科学领域:
- 心血管生物学 心血管生物学
- 心脏病的遗传学 心脏病的遗传学
- 神经心脏病学 神经心脏病学
背景情况:
- 节律失调性心肌病 (AC) 是一种家族性心脏病,主要是由脱体基因突变引起的,导致年轻人和运动员的与压力相关的突然死亡.
- AC心脏表现出纤维脂肪病变,导致心律失常和收缩功能障碍.
- 以前的压力,心律失常和交感神经元 (SN) 之间的相关性表明SN参与,但这仍然未得到证实.
研究的目的:
- 为了研究AC相关的desmoglein-2 (DSG2) 下调对交感神经元 (SN) 生物学中的作用.
- 评估德斯莫格林-2突变 (Dsg2) 的小鼠的心脏交感内置.
- 为了确定DSG2变异是否会影响心律失常性心肌病的SNs.
主要方法:
- 分子测定检测SNS中的DSG2表达.
- 在Dsg2mut/mut小鼠中,同焦点免疫光和心脏SN网络的3D重建.
- 从新生儿Dsg2小鼠中分离和分析心脏SNs.
- 在PC12衍生的SNs中,病毒辅助的DSG2下调.
主要成果:
- DSG2以SN表示,表明DSG2突变载体在SN中具有突变蛋白.
- Dsg2mut/mut小鼠表现出改变的SN拓,包括纤维化区域中的超内内和异质分布.
- 主要Dsg2mut/mutSNs显示轴突发芽,过程发展和变形分布受损.
- PC12细胞的DSG2下调复制了这些表型变化,证实了AC链接的DSG2变异对SNs的影响.
结论:
- 改变的交感内置是一种以前未被识别的心律失常性心肌病的特征.
- 除了心肌细胞外,AC病原发生还涉及多种细胞类型,包括心脏和心脏外同情神经元.
- 在AC中DSG2下调主要影响交感神经元,增加心脏内置密度并改变神经元分布.
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