皮质WNT分泌驱动了发展胃癌的利基逃生
Jaehun Lee1,2, Soomin Kim1,3, Youngchul Oh1,2
1Center for Genome Engineering, Institute for Basic Sciences, Daejeon, Republic of Korea.
Molecular cancer
|December 16, 2025
概括
胃瘤通过KRAS-MAPK信号获得WNT独立性,驱动WNT7B分泌. 针对这个KRAS-MAPK-SMAD2/3轴为胃癌和其他KRAS高的癌症提供了潜在的治疗策略.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 胃肠病学 胃肠病学
背景情况:
- WNT信号传递对于胃上皮维护和癌症发展至关重要.
- 胃瘤往往缺乏常见的WNT激活突变 (APC,CTNNB1),使其利基独立机制不清楚.
- 了解WNT在胃癌中获得自给自足的过程对于治疗的发展至关重要.
研究的目的:
- 为了研究胃瘤如何实现WNT利基独立.
- 阐明在胃癌中KRAS驱动的WNT连接体分泌的分子机制.
- 在胃恶性瘤中识别WNT信号通路内的潜在治疗点.
主要方法:
- 对小鼠胃器官和体内模型进行分析,这些模型具有致癌性KRAS突变.
- 使用增长因子撤回,抑制剂治疗和WNT救援试验评估利基独立性.
- 单核多原子测序 (RNA + ATAC) 探索转录和染色质动态,在患者衍生器官和胰腺癌数据集中得到验证.
主要成果:
- 胃上皮细胞中的瘤性KRAS激活诱导了WNT连接体分泌,绕过了需要额外的突变.
- KRAS-MAPK信号激活了SMAD2/3结合增强剂,导致WNT7B的表达,并促进了上皮层WNT的分泌.
- 患有特定放大 (HER2,KRAS,WNT2) 的患者衍生的胃癌显示出对WNT分泌的依赖性,对 Porcupine 抑制剂敏感.
- 发现KRAS-MAPK-WNT7B轴在包括肺癌在内的各种癌症类型中保持不变.
结论:
- 胃瘤可以通过KRAS-MAPK-SMAD2/3驱动的上皮层WNT分泌机制实现WNT位独立.
- 向MAPK,SMAD2/3或WNT分泌物在胃癌中具有潜在的治疗脆弱性.
- 这种KRAS驱动的轴代表了KRAS高恶性瘤的保护漏洞,表明了更广泛的治疗适用性.
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