瘤矩阵蛋白质甘氨酸的积累和处理改变了T细胞效应因子的功能,以及对患有寡基转移性结直肠癌的患者免疫治疗的反应
Dustin A Deming1, Sean G Kraus2, Joshua Brand3
1University of Wisconsin-Madison Madison, WI United States.
概括
在结直肠癌 (CRC) 中的维西康 (VCAN) 积累阻碍了T细胞的活动. 然而,其蛋白质分解 (VPP表型) 与更好的免疫反应和免疫疗法试验中更好的结果相关.
科学领域:
- 免疫学 免疫学 免疫学
- 在瘤学瘤学.
- 蛋白质甘油生物学 蛋白质甘油生物学
背景情况:
- 维西康 (VCAN) 是一种免疫调节矩阵蛋白质糖.
- 分裂的VCAN释放了维西金 (Vkine),一种免疫刺激片段.
- 在免疫监测和免疫治疗反应中,VCAN的作用需要进一步研究.
研究的目的:
- 评估VCAN对结直肠癌 (CRC) 免疫监测的影响.
- 在一个前性临床试验中评估VCAN对免疫治疗反应的影响.
- 将VCAN状态和免疫表型与临床结果相关联.
主要方法:
- 在VCAN设置中测试的T细胞功能.
- 从243名患者获得正常和匹配的CRC组织.
- 进行了一项1b期临床试验 (NCT02837263),包括15名微观卫星稳定性寡度转移性CRC的受试者,结合了立体体辐射疗法 (SBRT),pembrolizumab和切除.
- 使用scRNAseq.与VCAN状态和免疫表型相关的结果.
主要成果:
- 在59%的CRC中积累了VCAN,在27%的CRC中积累了VCAN蛋白质过分主导 (VPP) 现型 (40%的寡头转移性CRC).
- VCAN显著降低了CD8+ T细胞贩运和效应器功能 (减少IL2RA,PD1,GZMB表达).
- 临床试验实现了60%的1年无复发存活率 (RFS);VPP表型显示了改善RFS的趋势 (p=0.053),所有患者仍然活着,随访时间中位数为4.1年.
- VPP表型与增强的循环CD8+T细胞功效器功能相关,通过研究治疗进一步改善.
结论:
- 在CRC中,VCAN积累限制了T细胞贩运和效应器功能.
- VCAN蛋白质分解 (VPP表型) 与增强的CD8+ T细胞效应体表型有关.
- VPP表型与瘤透淋巴细胞的增加以及免疫疗法试验中改善的临床结果相关.
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