APC协调SETD8的GSK3酸化以抑制结直肠癌的发生
Zvi Cramer1, Keara Monaghan1, Ricardo Petroni1
1Department of Biomedical Sciences, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Cell reports
|March 6, 2026
概括
在结直肠癌 (CRC) 中,APC瘤抑制剂的丧失导致SETD8的瘤活性. 通过GSK3的酸化抑制SETD8,防止基因激活和YAP在CRC中的可访问性.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 癌症遗传学 癌症遗传学
背景情况:
- 大肠直肠癌 (CRC) 是癌症死亡的主要原因.
- 腺多样性肠杆菌 (APC) 瘤抑制剂的突变是CRC的关键发起者.
- 损失APC稳定了β-CATENIN,促进了线索性基因转录,但其对其他GSK3标的调控仍然不清楚.
研究的目的:
- 在肠表皮中识别APC调节的GSK3酸化的新目标.
- 调查SETD8酸化在结直肠癌发病过程中的作用.
- 阐明链接APC损失,SETD8和瘤基因激活的分子机制.
主要方法:
- 利用了肠道瘤发生的小鼠模型.
- 研究了蛋白质-蛋白质相互作用和酸化事件.
- 进行基因表达分析和染色体免疫沉 (ChIP).
- 评估了YAP蛋白质对目标基因的可访问性.
主要成果:
- 确定了SETD8,H4K20甲基转移酶,作为APC协调的GSK3酸化的目标.
- 证明GSK3酸化抑制了SETD8.8的致癌活性.
- 显示SETD8酸化的丧失使小鼠对瘤原体的侮辱敏感.
- 发现SETD8酸化的丧失导致致癌基因的H4K20me1减少,通过增加YAP可访问性来促进它们的激活.
- 突出了在CRC中APC损失的新型β-CATENIN独立机制.
结论:
- 通过GSK3对SETD8的酸化是抑制其在肠表皮中的致癌功能的关键机制.
- 通过与β-CATENIN无关的途径,APC损失会导致CRC,其中包括SETD8的失调和随后的基因激活.
- 准SETD8或相关途径可能为结直肠癌提供新的治疗策略.
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