CLIN CANCER RES:MET致癌活化和JAK2失活会影响肺癌PD-L1表达

2018-09-30 MedSci MedSci原创

PD-L1和PD-1等免疫检查点阻断疗法正在几种恶性肿瘤中进行研究。CLIN CANCER RES近期发表了一篇文章,研究肺遗传学对肿瘤细胞逃脱免疫监视检查点的作用。

PD-L1和PD-1等免疫检查点阻断疗法正在几种恶性肿瘤中进行研究。CLIN CANCER RES近期发表了一篇文章,研究肺遗传学对肿瘤细胞逃脱免疫监视检查点的作用。

作者检测了超过150种原发性非小细胞肺癌样本,包括肺肉瘤样癌,主要检测HLA-I复合物,PD-L1,肿瘤浸润性CD8 +淋巴细胞的水平以及主要肺癌基因的改变。使用研究手段激活或抑制选定的通路以在癌细胞系中验证其相关性。作者在处理后还进行了RNA测序以评估这些基因表达的变化。研究结果表明,MET-致癌活化倾向与PD-L1阳性免疫染色相关,而STK11突变与阴性免疫染色相关。在MET改变的肿瘤细胞中,MET诱导了PD-L1的转录增加,且独立于IFNγ介导的JAK / STAT途径。MET的活化还会上调其他免疫抑制基因(PDCD1LG2和SOCS1),上调参与血管生成(VEGFA和NRP1)和细胞增殖基因转录。JAK2失活突变与MET和STK11改变同时出现,抑制IFNγ治疗诱导的免疫反应相关基因。

文章最后认为,MET活化会促进几种负性免疫反应检查点调节因子的表达,包括PD-L1。此外,肺癌细胞中JAK2失活会阻止对IFNγ的反应。这些改变可能通过促进免疫耐受而促进肿瘤生长,并可能影响免疫检查点抑制剂的治疗反应。

原始出处:

Maria Saigi, Juan J,et al. MET-Oncogenic and JAK2-Inactivating Alterations Are Independent Factors That Affect Regulation of PD-L1 Expression in Lung Cancer.CLIN CANCER RES.September 2018 doi: 10.1158/1078-0432.CCR-18-0267

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    2018-11-21 一闲
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    2018-10-02 smartjoy
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    2018-10-02 jambiya
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    2018-10-02 gao_jian4220

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