在转移性结直肠癌中,塑性EMP1+转换为LGR5+细胞状态转换作为绕过KRAS-G12D药理抑制的方法
Alessia Centonze1, Adrià-Jaume Roura1, Meritxell Novillo-Font2
1Institute for Research in Biomedicine, Barcelona, Spain.
Cancer discovery
|October 23, 2025
概括
克拉斯抑制剂在转移性结直肠癌 (mCRC) 中表现有前途. 然而,先进的mCRC细胞通过成为Lgr5+干细胞来适应RMC-9945,需要新的治疗策略.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 癌症治疗方法 癌症治疗方法
背景情况:
- 瘤性KRAS突变是转移性结直肠癌 (mCRC) 的关键驱动因素.
- 通过像RMC-9945这样的小分子抑制剂向活性RAS-G12D构造提供了一个治疗策略.
研究的目的:
- 在临床前的mCRC模型中研究RMC-9945的疗效,这是活性RAS-G12D的共价抑制剂.
- 了解RAS(ON) 抑制剂治疗后mCRC转移的适应机制.
主要方法:
- 利用临床前的CRC模型与早期和晚期肝转移.
- 管理RMC-9945并分析了转录状态的变化 (Emp1+,Lgr5+).
- 研究了转录因子动态和染色质重塑.
- 在RMC-9945.5与RMC-9945.5结合使用的基因废除策略.
主要成果:
- 在早期的肝转移中,RMC-9945表现出持久的疾病控制,但在晚期疾病中有效性降低.
- 转移细胞从Emp1+状态转变为WNT驱动的,Lgr5+干细胞类状态,抵抗RAS-G12D抑制.
- 这种适应性细胞状态的变化发生得很快,涉及转录因子转移与最小的染色质重塑.
- 结合RAS-G12D抑制和Lgr5+细胞剥离,在小鼠mCRC模型中降低了转移负担并改善了生存率.
结论:
- 瘤性KRAS在调节mCRC中的细胞可塑性方面发挥着关键作用.
- 对RAS抑制剂的适应性耐药性涉及到快速过渡到类似干细胞的状态.
- 针对KRAS驱动的细胞可塑性是克服mCRC治疗耐药性的潜在策略.
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