通过向PI3Kγ在骨髓细胞中克服对检查点阻塞治疗的抵抗
Olivier De Henau1, Matthew Rausch2, David Winkler2
1Memorial Sloan Kettering Cancer Center, Parker Institute for Cancer Immunotherapy and Swim Across America/Ludwig Collaborative Laboratory, New York, New York 10065, USA.
Nature
|November 10, 2016
概括
用PI3Kγ抑制剂向髓状细胞可以克服对癌症免疫治疗的抵抗力. 这种方法重塑瘤的免疫微环境,恢复对免疫检查点阻断抗体的敏感性.
科学领域:
- 癌症学
- 免疫学
- 药理学
背景情况:
- 免疫疗法,包括免疫检查点阻断 (ICB) 抗体,通过消毒免疫系统在癌症治疗中具有前景.
- 然而,对ICB的耐药性是一个重大挑战,通常由瘤微环境中的免疫抑制性髓状细胞介导.
- 这些骨髓细胞的高透与预后不佳以及对ICB疗法的反应降低有关.
研究的目的:
- 在临床前癌症模型中研究骨髓细胞在介导ICB耐药性的作用.
- 评估酸3-激酶 (PI3Kγ) 的有效性,该酶是骨髓细胞中的关键酶,用于克服ICB抵抗.
- 探索用于精确癌症药物的新组合策略.
主要方法:
- 使用临床前小鼠模型系统研究瘤免疫力和ICB耐药性.
- 研究了各种瘤中透髓状细胞的抑制活性.
- 用于选择性PI3Kγ抑制剂 (目前处于第一阶段临床试验中,NCT02637531),以评估其对瘤免疫微环境和ICB敏感性的影响.
主要成果:
- 在临床前模型中证实抑制骨髓细胞活动直接介导对ICB的耐药性.
- 证明选择性药理向PI3Kγ可以恢复对ICB的敏感性.
- 显示PI3Kγ抑制重塑瘤免疫微环境,促进细胞毒性T细胞介导的瘤回归,而不会直接向癌细胞.
结论:
- 向PI3Kγ在骨髓细胞中是一种可行的策略,以克服具有高水平免疫抑制骨髓透的癌症中的ICB抵抗.
- 选择性PI3Kγ抑制剂,如IPI-549,为增强癌症免疫疗法的新组合疗法提供了机会.
- 这项研究支持针对瘤免疫环境的精准医学方法.
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