在非小细胞肺癌中, osimertinib 治疗耐药后瘤微环境发生变化
Ruoshuang Han1, Haoyue Guo2, Jinpeng Shi2
1Department of Medical Oncology, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, PR China; Department of Oncology, Southwest Hospital, Third Military Medical University, Chongqing, PR China.
在非小细胞肺癌中对奥西默蒂尼布的获得性耐药性与免疫变化有关. 瘤外基因组通过驱动巨细胞M2极化促进免疫抑制的微环境,阻碍T细胞活动.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 癌症生物学 癌症生物学
背景情况:
- 在非小细胞肺癌 (NSCLC) 中对向疗法如奥西默蒂尼布所获得的耐药性是一个重要的临床挑战.
- 新出现的证据凸显了瘤微环境 (TME) 在调解这种抗性的关键作用.
- 在TME中,瘤细胞和免疫细胞之间的动态相互作用越来越被认为是关键因素.
研究的目的:
- 为了研究瘤微环境的变化,在NSCLC中发展 osimertinib 耐药性后.
- 阐明瘤细胞和免疫细胞在耐药TME中相互作用的机制.
- 为了识别潜在的分子介质,如外体,参与TME重塑在 osimertinib 耐药性的过程中.
主要方法:
- 基于RNA测序的瘤免疫透分析使用TIMER 2.0.0.
- 流细胞计和实时细胞分析,以评估瘤免疫细胞相互作用.
- 外基因组分离,然后进行miRNA测序 (miRNA-seq) 和无标签的蛋白质组学.
主要成果:
- 奥西默提尼布耐药性与免疫和微环境评分下降,CD8+ T细胞减少和M0巨细胞增加有关.
- 来自瘤的外体促进了巨细胞向M2表型的两极分化,这反过来减少了瘤细胞增殖的抑制作用.
- 外基因组还调节了T细胞种群,减少了CD4+HLA-DR-T细胞,增加了CD4+PD1+T细胞,表明免疫抑制.
结论:
- 在NSCLC中Osimertinib耐药性的特点是免疫抑制性TME,T细胞透/激活减少,M2极化巨细胞增加.
- 瘤衍生的外体似乎调解了这些TME变化,可能是通过特定的miRNAs,如miR-1258-3p和miR-17-5p.
- 了解这些外体介导相互作用对于开发克服向治疗耐药性的策略至关重要.
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