刺缺乏肝细胞的与衰老相关的秘密组驱动着MASLD的进展
Ji Hye Jun1, Kuo Du1, Rajesh Kumar Dutta1
1Division of Gastroenterology, Department of Medicine and.
The Journal of clinical investigation
|August 27, 2024
概括
肝细胞中的刺信号抑制促进了与代谢功能障碍相关的脂肪性肝病 (MASLD),通过减少胺酸酶 (TP),一种防止细胞损伤和衰老的蛋白质. 恢复TP水平可以减轻MASLD的进展.
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
- 细胞衰老 细胞衰老
背景情况:
- 衰老的肝细胞与代谢功能障碍相关的脂肪性肝病 (MASLD) 严重程度相关.
- 将肝细胞衰老与MASLD进展联系在一起的机制尚不清楚.
- 通过平滑 (Smo) 删除的刺信号干扰诱导肝细胞脂毒性和衰老.
研究的目的:
- 调查Smo缺乏肝细胞的分泌物是否延续衰老并驱动MASLD.
- 阐明蒂米丁酸化酶 (TP) 在MASLD病变发生过程中的作用.
- 为了确定对肝细胞衰老和脂毒性产生鱼信号的影响.
主要方法:
- 人类和小鼠MASLD肝脏样本的RNA-Seq分析.
- 在使用缺乏胆,氨基酸受限高脂肪饮食 (CDA-HFD) 的小鼠中诱导MASLD.
- 对肝细胞衰老,脂毒性,DNA损伤和纤维化标志物的评估.
- 用蒂米丁酸化酶 (TP) 或TP抑制剂治疗肝细胞.
主要成果:
- MASLD肝脏显示Smo+肝细胞枯竭,衰老细胞丰富.
- 与Smo+小鼠相比,Smo-小鼠的DNA损伤,衰老,脂肪肝炎和纤维化增加.
- 在Smo-小鼠中降低了TP水平;TP治疗改善了Smo-肝细胞的衰老和脂毒性,而TP抑制在Smo+小鼠中恶化了MASLD.
结论:
- 在肝细胞中抑制刺信号传递促进了MASLD.
- 通过抑制刺信号来抑制TP生产,有助于肝细胞脂毒性和衰老.
- 恢复TP可能为MASLD提供治疗策略.
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