脂肪性肝病诱导YAP/TAZ驱动的细胞竞争,可以抑制瘤开始
Ana Algueró-Nadal1, Hasse Mol1, Elena Zoppolato1
1VIB Center for Cancer Biology, Belgium; KU Leuven Department of Oncology, KU Leuven, Belgium.
早期代谢功能障碍相关的脂肪性肝病 (MASLD) 通过激活Yap/Taz介导的细胞竞争,令人惊地抑制了小鼠的肝癌发病. 这种保护作用在晚期代谢功能障碍相关的脂肪肝炎 (MASH) 中失去了.
科学领域:
- 肝病学和癌症生物学 肝病学和癌症生物学
- 在疾病发病过程中细胞与细胞的相互作用.
- 代谢功能障碍和肝脏疾病
背景情况:
- 代谢功能障碍相关的脂肪性肝病 (MASLD) 和其晚期形式,代谢功能障碍相关的脂肪性肝炎 (MASH),是肝癌的重要风险因素.
- 虽然已知MASH的炎症和纤维化会促进肝癌,但早期MASLD (仅仅是乳脂病) 在癌症发病中的作用尚不清楚.
研究的目的:
- 为了研究单独的脂肪的影响,在没有显著的纤维化和炎症的情况下,对肝癌的发展.
- 在小鼠模型中阐明早期MASLD影响肝脏瘤发生的机制.
主要方法:
- 在使用西方饮食的小鼠中诱导早期的MASLD,其特点是肥胖症和轻度肝炎.
- 通过对基因编码等离子体的液态动力注射到尾静脉,触发肝脏瘤发生.
- 用组织学和单核RNA测序对Hippo信号通路组件 (Yap和Taz) 的基因操纵和瘤发育的评估.
主要成果:
- 早期的MASLD,由西方饮食诱导,通过增强瘤发起细胞的消除来抑制肝脏瘤的发展.
- 这种抑制是由周围脂肪性肝细胞的竞争力增加引起的,而不是对瘤基因表达细胞的直接影响.
- 在稳定性肝细胞中激活Hippo途径效应者Yap和Taz使他们能够超越瘤发起细胞的竞争力;这种效应在先进的MASH中消失了.
结论:
- 早期的MASLD建立了一个依赖于Yap/Taz的细胞竞争机制,可以抑制瘤的开始.
- 由于炎症,纤维化和缺陷导致非突变肝细胞竞争力下降,这种瘤抑制作用在先进的MASH中被废除.
- 这些发现揭示了早期MASLD的新瘤抑制作用,强调了非细胞自主机制和细胞健身景观在慢性肝病和癌症风险中的重要性.
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