在mTORC1抑制后,TFEB在三阴性乳腺癌细胞中触发了矩阵降解和入侵程序
David Remy1, Sandra Antoine-Bally1, Sophie de Toqueville1
1Institut Curie, CNRS UMR 144, PSL University, 75005 Paris, France.
Developmental cell
|December 27, 2024
概括
在三阴性乳腺癌 (TNBC) 中抑制PI3K/AKT/mTOR通路可促进基质降解和侵入性. 这一意想不到的结果表明,对乳腺癌治疗的mTOR抑制剂进行重新评估.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 拉巴胺素 (mTOR) 途径的酸丁3-激酶 (PI3K) /AKT/哺乳动物标通常在三阴性乳腺癌 (TNBC) 中过度活跃,与糟糕的结果相关.
- 这一途径是乳腺癌治疗的关键目标.
研究的目的:
- 在三阴性乳腺癌模型中研究抑制含有mTOR复合物1 (mTORC1) 的后果.
- 了解导致对mTORC1抑制反应的分子机制.
主要方法:
- 在TNBC细胞系和患者衍生异种移植 (PDX) 中,对关键的mTORC1组件进行淘汰和使用mTOR抑制剂进行治疗.
- 细胞外基质降解的分析,转录因子EB (TFEB) 核转位,内分泌体功能,细胞外和细胞表型.
- 在异种移植模型中评估invadopodia活动和瘤组织.
主要成果:
- mTORC1抑制导致细胞外基质蛋白质分解的显著增加 (约为10倍).
- 抑制诱导了TFEB的核转位,激活了参与内分泌体功能和外细胞分裂的基因.
- 这导致了内酶体循环增加,MT1-MMP的表面暴露,以及增强的侵入活动.
- 观察到基底类乳腺癌细胞表型和瘤组织的破坏.
结论:
- mTORC1抑制触发了TNBC中的亲侵入性机制,包括增强的基因分解和细胞侵入性.
- 这些发现需要重新评估使用mTOR抑制剂治疗乳腺癌的治疗策略.
- 针对PI3K/AKT/mTOR途径需要仔细考虑在某些情况下可能产生的前瘤性影响.
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