m6A修饰破坏Prss8的稳定,并通过TLR4-介导的炎症反应激活肝细胞
Huimei Chen1,2, Linhui Zhang1,2, Lili Zhang1
1Clinical Research Experiment Center, The First Affiliated Hospital of Anhui University of Chinese Medicine, Hefei, China.
DNA and cell biology
|September 25, 2025
概括
修改Serine蛋白酶8 (Prss8) 的6 - 甲基氨酸 (m6A) 通过激活肝星细胞促进肝纤维化. 准这种m6A修改为肝纤维化提供了潜在的治疗策略.
科学领域:
- 表观遗传学和RNA修饰
- 胃肠病学和肝病学
- 分子和细胞生物学分子和细胞生物学
背景情况:
- 6 - 甲基氨酸 (m6A) 是一种普遍存在的RNA修饰,与各种疾病有关.
- 已知血清蛋白酶8 (Prss8) 有助于肝纤维化 (LF) 的进展.
- 将Prss8的m6A修饰与肝星细胞 (HSC) 在LF中的激活联系在一起的确切机制仍然难以捉摸.
研究的目的:
- 调查Prss8 m6A修饰在肝纤维化病原发生中的作用.
- 阐明 Prss8 m6A 修饰如何影响肝星细胞激活.
- 根据Prss8 m6A规则,探索肝纤维化的潜在治疗点.
主要方法:
- 从肝纤维化小鼠模型中分离初级肝细胞和肝星细胞 (HSC).
- 肝细胞和HSCs的共同培养系统用于实验研究.
- 定量PCR,甲基化RNA免疫沉,西式涂抹和ELISA用于评估基因/蛋白质表达和m6A修饰水平.
主要成果:
- 在LF模型中的肝细胞显示Prss8 mRNA/蛋白减少,但Prss8 m6A修饰增加.
- 在LF模型中,HSC激活标记物TLR4,IL-1β和IL-18显著增加.
- 突变Prss8 m6A位点增加了Prss8的mRNA/蛋白质稳定性,降低了m6A水平,并降低了炎症标志物和TLR4.4的调节.
结论:
- Prss8 m6A修饰破坏了Prss8 mRNA的稳定,促进了TLR4介导的炎症反应和肝纤维化中过度的HSC激活.
- Prss8 m6A-TLR4信号通路是肝纤维化病原体的关键驱动因素.
- 准Prss8 m6A修饰是一种有前途的治疗途径,用于治疗肝纤维化.
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