缺少ALDH2驱动了通过氧化应激和雌激素受体激活的增殖性乳腺形态发生和上皮细胞干细胞
bioRxiv : the preprint server for biology
|November 19, 2025
概括
脱酶2 (ALDH2) 缺乏,即使没有酒精,也会导致乳腺过度生长,增加乳腺癌的风险. 这通过氧化应激和荷尔蒙变化发生,突出显示ALDH2
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 癌症生物学 癌症生物学
背景情况:
- 酒精消费与乳腺癌有关,部分是通过像乙甲这样的有毒化物.
- ALDH2对于解毒和预防氧化应激,DNA损伤和荷尔蒙失调至关重要.
- 不管酒精含量如何,ALDH2缺乏对乳腺生物学的影响尚不清楚,尤其是在东亚人口中,ALDH2变体的流行率很高.
研究的目的:
- 研究ALDH2缺乏对小鼠乳腺发育和癌症易感性的影响,独立于酒精暴露.
- 阐明ALDH2缺乏影响乳腺组织恒温的分子机制.
主要方法:
- 使用基于C57BL/6的ALDH2淘汰 (Aldh2-/-) 鼠标模型.
- 分析了乳腺增殖,上皮亚群,茎状 (乳球形成,殖民地形成效率),氧化应激标志物 (8-OHdG),DNA损伤 (p53,H2A.X),信号通路 (MAPK,NF-κB,Nrf2,RANKL) 和激素调节 (ERα,PR,erbB3).
主要成果:
- 阿尔德2-/-小鼠表现出高增殖乳腺,上皮质密度增加和管道扩张.
- 缺少ALDH2会增加乳腺上皮干,氧化应激,DNA损伤,并激活NF-κB,p38 MAPK和Nrf2信号传递.
- 在Aldh2-/-乳腺中观察到RANKL的升高和荷尔蒙失调 (增加ERα,PR和erbB3信号).
结论:
- 由于ALDH2缺乏而产生的内源性化物积累,深刻地改变了乳腺发育和干部,独立于酒精.
- 机制涉及氧化应激,DNA损伤,和失调的雌激素受体和受体氨酸激酶信号传递.
- 缺少ALDH2可能会增加乳腺组织对瘤原因子的敏感性和乳腺癌风险.
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