通过PI3Kγ激活驱动的VEGFR2阻断克服了获得的KRAS G12D抑制剂耐药性
bioRxiv : the preprint server for biology
|September 26, 2025
概括
克拉斯G12D抑制剂通过VEGFA-VEGFR2信号传递面临抵抗. 将VEGFA-VEGFR2阻塞与KRAS抑制剂结合起来,可以克服胃肠道癌症中的这种抗性.
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:
- 克拉斯G12D突变驱动许多固体瘤,包括胃肠道癌.
- 对KRAS抑制剂的获得性耐药性限制了治疗疗效,需要新的治疗策略.
研究的目的:
- 研究胃肠道癌症中对KRAS G12D抑制剂MRTX1133获得的耐药性机制.
- 为了确定克服MRTX1133抗性的治疗点.
主要方法:
- 产生了9种获得MRTX1133耐药性的人类胃肠道癌症模型,包括患者衍生器官 (PDO).
- 单细胞RNA测序 (scRNA-seq) 用于分析耐药模型.
- 涉及PI3Kγ,AKT,SP1,VEGFA和VEGFR2信号通路的机制研究.
- 治疗组合的体外和体内验证.
主要成果:
- 耐药模型表现出丰富的血管生成,缺氧和上皮细胞转移到介质细胞 (EMT) 的签名.
- 增加的VEGFA表达和VEGFR2酸化是由AKT激活和SP1转位驱动的.
- 通过KRAS-p110γ-p101复合体形成,PI3Kγ活动的增加推动了自身隐性VEGFA-VEGFR2循环和EMT.
- 抑制VEGFA-VEGFR2恢复了对MRTX1133的敏感性,并减少了EMT.
- 抗VEGFR2和MRTX1133的联合治疗在体内显示出优异的瘤减少.
结论:
- 由PI3Kγ激活的VEGFA-VEGFR2信号传递是对KRAS G12D抑制剂获得耐药性的关键机制.
- 针对VEGFA-VEGFR2信号提供了一种可行的策略,以克服KRAS突变癌症的耐药性.
- 组合疗法对治疗抗性KRAS突变性胃肠道癌症具有前景.
更多相关视频
09:38Establishing Dual Resistance to EGFR-TKI and MET-TKI in Lung Adenocarcinoma Cells In Vitro with a 2-step Dose-escalation Procedure
Published on: August 11, 2017
9.2K
09:29Development and Maintenance of a Preclinical Patient Derived Tumor Xenograft Model for the Investigation of Novel Anti-Cancer Therapies
Published on: September 30, 2016
14.3K
相关概念视频
PI3K/mTOR/AKT Signaling Pathway
5.4K
The mammalian target of rapamycin (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1 (mTORC1) and mTOR complex 2 (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast, mTORC2 consists of a...
5.4K
mTOR Signaling and Cancer Progression
4.6K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
4.6K
