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HNF4alpha-cMyc相互作用在部分肝切除术后肝脏再生中的作用

Manasi Kotulkar¹, Diego Paine-Cabrera¹, Kaitlyn Venneman¹

¹Department of Pharmacology, Toxicology, and Therapeutics, University of Kansas Medical Center, Kansas City, KS, United States.

Frontiers in endocrinology

|August 15, 2024

概括

肝细胞核因子4α (HNF4α) 的损失会延迟肝脏的再生,但c-Myc会补偿. 在双重淘汰赛中,肝脏原生细胞驱动再生,突出显示肝脏修复的不同途径.

科学领域:

肝病学肝病学是一种肝病学.
分子生物学分子生物学
再生医学是一种再生医学.

背景情况:

肝细胞核因子4α (HNF4α) 是肝细胞分化的关键调节者.
HNF4α负面调节像c-Myc这样的原生菌原基因,影响肝细胞增殖.
肝脏再生中的HNF4α和c-Myc之间的相互作用仍未完全阐明.

研究的目的:

为了研究HNF4α和c-Myc在部分肝切除术 (PHX) 后肝脏再生过程中的相互作用.
确定HNF4α和c-Myc在肝细胞和肝脏前体细胞在肝脏修复过程中的增殖中的作用.

主要方法:

使用了野生类型 (WT),HNF4α-淘汰赛 (KO),c-Myc-KO和HNF4α-c-Myc双淘汰赛 (DKO) 的小鼠模型.
通过部分肝切除术 (PHX) 诱导肝脏再生,并在多个时间点 (0h, 24h, 48h, 7D, 14D) 收集样本.
分析肝脏体重,肝细胞增殖和关键标记物的表达 (HNF4α,c-Myc,Krt19,Epcam).

主要成果:

所有的基因型最终在PHX后14天恢复了肝脏体重.
与WT和c-Myc-KO小鼠相比,HNF4α-KO和DKO小鼠的肝脏再生延迟.
在第14天,DKO小鼠的整体肝细胞增殖减少,肝细胞前代细胞标志物 (Krt19,Epcam) 的表达增加.
在幸存的HNF4α-KO和DKO小鼠中观察到HNF4α的再表达.

结论:

在HNF4α缺乏的肝脏中,c-Myc有助于肝细胞驱动的增殖,以补偿组织质量.
在缺少HNF4α和c-Myc的情况下,由肝原生细胞 (HPC) 驱动的增殖支持肝脏的再生.
包括HPC在内的不同的细胞机制被激活,以确保当正规途径受到损害时,肝脏的修复.

关键词:

这就是HNF4α.部分肝切除术部分肝切除术原始细胞是原始细胞.它们的扩散和扩散.复兴再生是一种再生方式.

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