二倍体肝细胞通过抑制的JNK信号抵抗乙氨基诱导的肝损伤
Sierra R Wilson1,2,3, Evan R Delgado1,2,3, Frances Alencastro1,2,3
1Department of Pathology, University of Pittsburgh School of Medicine, University of Pittsburgh, Pittsburgh, PA.
bioRxiv : the preprint server for biology
|August 6, 2025
概括
二倍性肝细胞通过减少JNK激活和线粒体损伤来保护肝脏免受乙氨基损伤. 这一发现揭示了肝细胞 ploidy.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 细胞生物学 细胞生物学
- 再生医学是一种再生医学.
背景情况:
- 肝脏再生涉及双倍体和多倍体肝细胞,功能差异不明.
- 新出现的证据表明,肝细胞性状态在肝脏修复中具有损伤特异性的作用.
- 乙氨基 (APAP) 诱导的肝损伤是研究肝细胞反应的常见模型.
研究的目的:
- 为了研究二倍化肝细胞在促进APAP诱导的肝损伤后肝脏愈合的作用.
- 为了确定是否增加的双胞胎肝细胞种群会对APAP毒性产生抗性.
- 阐明二倍体肝细胞的保护作用背后的分子机制.
主要方法:
- 用于终身肝脏特异性淘汰E2f7/E2f8 (LKO) 的小鼠,富含双胞胎肝细胞 (>70%).
- 给对照和LKO小鼠服用APAP,在96小时内评估损伤标志物 (生存,血清酶,亡,DNA碎片化).
- 采用E2f7/E2f8的肝细胞特异性淘汰 (HKO) 来区分基因删除效应与阴性变化.
- 进行了转录组和蛋白质分析,以检查分子通路,包括JNK激活和线粒体损伤.
主要成果:
- 经APAP治疗后,LKO小鼠的生存率提高,血清肝酶降低,缩和DNA碎片化减少,表明耐药性.
- 在成年肝细胞 (HKO) 中删除E2f7/E2f8并没有改变性,也没有赋予耐药性,排除了基因删除作为保护因素.
- 与对照组相比,APAP治疗的LKO肝脏显示JNK激活减少,线粒体损伤减少.
- 野生型肝细胞在APAP治疗后转向较低的性,支持双性细胞耐药性.
结论:
- 二倍性肝细胞对APAP诱导的肝损伤表现出抵抗力.
- 这种抵抗是由减少的JNK激活和线粒体损伤介导的.
- 肝细胞性是肝损伤反应和性的关键决定因素.
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