CLIN CANCER RES:头颈部肿瘤患者血浆PD-L1+外泌体的临床意义

2018-02-28 MedSci MedSci原创

头颈部鳞状细胞癌的肿瘤微环境是高度免疫抑制的。PD-L1表达水平升高的头颈部鳞状细胞癌预后尤其差。表达PD-L1并抑制T细胞功能的外泌体可以从头颈部鳞状细胞癌患者血浆分离出来。CLIN CANCER RES近期发表了一篇文章,研究PD-L1+外泌体对免疫抑制和肿瘤的影响

头颈部鳞状细胞癌的肿瘤微环境是高度免疫抑制的。PD-L1表达水平升高的头颈部鳞状细胞癌预后尤其差。表达PD-L1并抑制T细胞功能的外泌体可以从头颈部鳞状细胞癌患者血浆分离出来。CLIN CANCER RES近期发表了一篇文章,研究PD-L1+外泌体对免疫抑制和肿瘤的影响。

作者使用抗CD63抗体通过尺寸排阻色谱法分离40例头颈部鳞状细胞癌患者血浆外泌体,使用流式细胞仪分析PD-1和PD-L1。PD-L1+和PD-1+外泌体百分比和平均荧光强度与患者临床病理数据相联系。PD-L1high和PD-L1low外泌体与活化的CD69+人CD8+T细胞±PD-1抑制剂共培养。分析T细胞CD69表达改变。使用ELISA检测患者血清可溶性PD-L1表达(sPD-L1)。研究结果表明,外泌体PD-L1表达水平与患者疾病活动度,UICC分期和淋巴结状态有关。与之相反,血浆sPD-L1水平或外泌体PD-1水平与任何临床病理特征均无关。PD-L1high外泌体共培养可以抑制CD69表达水平,但是PD-L1low外泌体无此效果。阻断PD-L1+外泌体与PD-1+T细胞信号可以减弱免疫抑制。

文章最后认为,外泌体PD-L1水平而非sPD-L1水平与头颈部鳞状细胞癌患者疾病进展有关。循环PD-L1+外泌体是评估头颈部鳞状细胞癌患者疾病和免疫活性的有效工具。

原始出处:
Marie-Nicole Theodoraki,Saigopalakrishna S.Yerneni,et al.Clinnical Significance of PD-L1+ Exosomes in Plasma of Head and Neck Cancer Patients.CLIN CANCER RES.February 2018 doi:10.1158/1078-0432.CCR-17-2664

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    2018-03-02 smartjoy
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    2018-03-02 wshxjq
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    2018-02-28 1ddf0692m34(暂无匿称)

    学习了.谢谢分享

    0

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