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Updated: May 29, 2025

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心肌细胞Klf9的构成表达会导致代谢功能障碍和自发性心力衰竭

Chandni Thakkar, Saleena Alikunju, Aishwarya Venkatasubramanium

bioRxiv : the preprint server for biology

|February 3, 2025

概括

在心脏中过度表达Klf9会破坏新陈代谢平衡和基因调节,导致心脏缩,功能障碍和小鼠衰竭. 这突出了Klf9的亮点.

科学领域:

心血管生物学心血管生物学
分子代谢的分子代谢.
心脏生理学心脏生理学

背景情况:

代谢灵活性对于心肌细胞的功能和在发育和疾病期间的生存至关重要.
葡萄糖皮质体受体 (GR) - 克鲁佩尔类因子9 (Klf9) 轴介导心肌细胞中的代谢适应.
心脏衰竭中Klf9表达的减少表明它在心脏平衡和功能障碍中的作用.

研究的目的:

调查Klf9在心脏平衡和功能中的作用.
在小鼠中描述心脏特异性Klf9过度表达的后果.

主要方法:

产生和表征心脏特异性Klf9敲进 (Klf9KI) 鼠标.
利用RNA测序 (RNA-seq) 在多个时间点进行转录分析.
进行了非向的代谢和线粒体功能测试.

主要成果:

Klf9KI小鼠发生了渐进性心脏缩,功能障碍和衰竭,死亡率显著.
转录组分析显示了特定阶段的基因表达变化,最初的下调随后是上调.
代谢和线粒体检测显示了脂质,碳水化合物和葡萄糖代谢的调节失调,以及线粒体呼吸复合体活动的逐渐下降,先于明显的功能障碍.

结论:

构成性Klf9过度表达会破坏心脏转录和代谢平衡.
由于Klf9过度表达而导致的线粒体缺陷有助于心脏缩和心脏衰竭的发展.
Klf9在维持心脏功能和代谢平衡方面发挥着至关重要的作用.

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