非正规EGFR信号传递对于MAPK介导的上皮细胞的顶端挤出至关重要
bioRxiv : the preprint server for biology
|June 4, 2025
概括
瘤基因诱导的细胞挤出,癌症机制,意外地需要表皮生长因子受体 (EGFR) 信号. 这种非正规的途径,独立于ERK,涉及E-cadherin内部化,揭示了癌症治疗的新目标.
科学领域:
- 细胞生物学 细胞生物学
- 癌症信号传递 癌症信号传递
- 分子瘤学分子瘤学
背景情况:
- 在上皮细胞中瘤基因表达可以触发它们从细胞层挤出.
- 驱动这种挤出的精确分子机制尚未完全理解.
- 已知途径涉及ERK和AKT信号,但它们的确切作用仍在争论中.
研究的目的:
- 为了研究由瘤性Ras{(Q61L}诱导的上皮细胞挤出机制.
- 确定涉及Ras驱动细胞挤出的新信号通路.
- 阐明表皮生长因子受体 (EGFR) 在这个过程中的作用.
主要方法:
- 使用乳腺上皮细胞与可诱导的瘤Ras (Q61L).
- 使用EGFR抑制剂 (Erlotinib) 和EGFR的遗传淘汰.
- 评估信号通路 (ERK,AKT) 和蛋白质局部化 (E-cadherin).
- 研究了MEK驱动的挤出和E-cadherin淘汰模型.
主要成果:
- 由于EGFR的抑制或删除,Ras-依赖的细胞挤出意外地被阻止.
- EGFR的作用是细胞自主,不依赖于正规的ERK激活.
- EGFR抑制部分阻断了Ras诱导的E-cadherin内部化,而单独的E-cadherin淘汰导致了挤出.
- 构成性活性MEK诱导的挤出也被EGFR抑制阻断.
结论:
- 非正规EGFR信号传递对于Ras诱导的上皮细胞挤出至关重要.
- 这一途径的功能独立于正规ERK激活.
- EGFR信号很可能通过诱导E-cadherin内细胞分裂来促进挤出.
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