CLIN CANCER RES:Tim-3+ Treg细胞在头颈部肿瘤患者中发挥抑制作用

2018-09-29 MedSci MedSci原创

调节性T(Treg)细胞是肿瘤浸润淋巴细胞(TIL)中的重要抑制细胞。Treg细胞表达免疫检查点受体PD-1,既往报道表达PD-1的Treg为抑制功能较低的"耗竭性"Treg。T细胞免疫球蛋白粘蛋白(Tim)-3是Th1免疫的负性调节因子,大量TIL Tregs均有表达,但Tim-3 + Tregs的功能目前仍不清楚。CLIN CANCER RES近期发表了一篇文章研究这一问题。

调节性T(Treg)细胞是肿瘤浸润淋巴细胞(TIL)中的重要抑制细胞。Treg细胞表达免疫检查点受体PD-1,既往报道表达PD-1的Treg为抑制功能较低的"耗竭性"Treg。T细胞免疫球蛋白粘蛋白(Tim)-3是Th1免疫的负性调节因子,大量TIL Tregs均有表达,但Tim-3 + Tregs的功能目前仍不清楚。CLIN CANCER RES近期发表了一篇文章研究这一问题。

作者根据Tim-3表达从切除的头颈部鳞状细胞癌(HNSCC)TIL中分选出CD4+ CTLA-4+ CD25high的Treg细胞。通过体内实验研究Tim-3+和Tim-3- TIL Tregs的功能和表型特征。对Tim-3+ TIL Treg进行基因表达谱分析和NanoString分析。使用鼠HNSCC肿瘤模型研究抗PD-1免疫疗法对Tim-3+ Treg的影响。研究结果表明,尽管PD-1高表达,Tim-3+ TIL Treg抑制幼稚T细胞增殖能力强于Tim-3- Treg。来源于人HNSCC TIL的Tim-3+ Treg也表现出出效应样表型,具有更高的CTLA-4,PD-1,CD39和IFN-γ受体的表达。外源性IFN-γ治疗可部分逆转Tim-3+ TIL Treg 的抑制功能。抗PD-1免疫疗法可以下调鼠HNSCC肿瘤分离的Tregs中Tim-3表达,并且该疗法可以逆转HNSCC TIL Tregs的抑制功能。

文章最后认为,Tim-3 + Treg在HNSCC TIL中具有明显的功能学和表型学意义。尽管高表达PD-1,但在抑制T细胞增殖方面非常有效。抗-PD-1免疫疗法诱导的IFN-γ可能通过逆转Tim-3 + Treg抑制功能产生临床获益。

原始出处:

Zhuqing Liu, Elizabeth L,et al. CDK9 Inhibitor Novel Effector Phenotype of Tim-3+ Regulatory T Cells Leads to Enhanced Suppressive Function in Head and Neck Cancer Patients.CLIN CANCER RES.September 2018 doi: 10.1158/1078-0432.CCR-17-1350

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    2019-01-07 cmsvly
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    2018-10-01 wshxjq
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