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在人类和小鼠肝移植中,SIRT1通过GSDME-IL18轴调节肝细胞编程细胞死亡
Kentaro Kadono1,2, Hidenobu Kojima1, Siyuan Yao1
1Dumont-UCLA Transplantation Center, Department of Surgery, Division of Liver and Pancreas Transplantation, David Geffen School of Medicine at UCLA, Los Angeles, CA, 90095, USA.
Cell death & disease
|November 23, 2023
概括
肝细胞Sirtuin 1 (SIRT1) 通过抑制细胞亡和GSDME介导的细胞死亡来保护肝移植免受冷损伤. 准SIRT1-IL18通路可能会改善肝移植的结果.
科学领域:
- 肝病学 肝病学是一种肝病学.
- 细胞死亡途径 细胞死亡途径
- 移植免疫学 移植免疫学
背景情况:
- 赛尔图因1 (SIRT1) 是细胞应激反应的关键调节者,包括炎症和新陈代谢.
- 骨髓SIRT1在肝炎中所起的作用已知,但其在冷期间肝细胞编程细胞死亡中的功能尚不清楚.
- 了解肝细胞SIRT1的作用对于改善肝移植结果至关重要.
研究的目的:
- 研究肝细胞特异性SIRT1在冷藏供体肝脏和再输血后肝移植中的作用.
- 阐明SIRT1影响肝细胞在寒冷压力下被编程的细胞死亡途径的分子机制.
- 确定潜在的治疗点,以减轻移植期间的肝损伤.
主要方法:
- 翻译研究涉及人体正体肝移植 (OLT) 和小鼠OLT模型.
- 肝细胞特异性SIRT1-Knockout (KO) 肝脏与OLT接受者的对照肝脏的比较.
- 使用初级小鼠肝细胞进行实验室内研究,这些肝细胞经过冷激活以向基因敲除 (SIRT1,GSDME,IL18Rβ).
- 对亡标记物 (Bcl-2,裂开的酶-3,XIAP) 和 GSDME 处理的分析.
主要成果:
- 在人体OLT中,肝脏SIRT1水平与抗亡性Bcl-2相关,并且与再输血后的割裂caspase-3负相关.
- 在小鼠中,肝细胞特异性SIRT1缺乏症加剧了亡和GSDME介导的细胞死亡,损害了肝功能和OLT存活率.
- 缺少SIRT1导致GSDME处理和IL18在冷压肝细胞中的分泌量增加.
- 在体内中和IL18挽救了肝细胞损伤,并恢复了缺少SIRT1的OLT中的抗亡表型.
结论:
- 肝细胞SIRT1对冷藏诱导的肝损伤和编程细胞死亡起着关键的保护作用.
- 一个涉及肝细胞SIRT1和IL18的新型分子电路调节肝移植中的细胞死亡途径.
- SIRT1-IL18轴代表了一个有前途的治疗点,以提高肝移植的存活率和功能.
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