细胞外PKM2通过调节巨细胞极性来调节癌症免疫力
Guangda Peng1, Bin Li1, Hongwei Han1
1Department of Biology, Georgia State University, University Plaza, Atlanta, GA, 30303, USA.
Cancer immunology, immunotherapy : CII
|May 9, 2025
概括
细胞外PKM2通过与整合素αvβ3.3相互作用,促进瘤中M2巨的两极分化. 针对这种相互作用与抗 PKM2 抗体将 M2 转化为 M1 巨细胞,增强癌症治疗.
科学领域:
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
- 分子医学是分子医学.
背景情况:
- 瘤微环境教育调节了抗瘤免疫力.
- 瘤相关巨细胞 (TAMs) 两极分化在免疫调节中至关重要.
- 癌细胞释放pyruvate kinase M2 (PKM2),以促进瘤的进展.
研究的目的:
- 研究细胞外PKM2 (EcPKM2) 在调节瘤免疫力的作用.
- 阐明 EcPKM2 影响巨细胞两极化的机制.
- 探索针对 EcPKM2-巨相互作用的治疗潜力.
主要方法:
- 研究 EcPKM2 与巨细胞整合素 αvβ3.3 的相互作用.
- 分析了整合蛋白-FAK-PI3K信号通路的激活.
- 在巨细胞中评估了PTEN表达和Arginase1 (Arg1) 活性.
- 在体内评估抗PKM2抗体的疗效.
主要成果:
- 在巨细胞上,EcPKM2与整合素αvβ3结合,从而激活FAK-PI3K通路.
- 这种激活抑制PTEN,导致Arg1表达增加和M2巨细胞两极分化.
- 针对 EcPKM2-整合素 αvβ3 相互作用的抗体逆转了 M2 极化到 M1.
- 与抗PKM2抗体和检查点抑制剂的联合治疗显示出增强的抗瘤作用.
结论:
- EcPKM2通过整体蛋白αvβ3-FAK-PI3K-PTEN-Arg1轴驱动M2巨细胞的两极分化.
- 针对 EcPKM2 提供了一种新的策略来重编程瘤免疫微环境.
- 反PKM2抗体是癌症治疗的有希望的治疗标,特别是在组合疗法中.
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