李雯君, 龚平. CCR8阳性调节性T细胞在结直肠癌免疫微环境中的作用及研究进展. 2026. biomedRxiv.202606.00048
CCR8阳性调节性T细胞在结直肠癌免疫微环境中的作用及研究进展
通讯作者: 龚平, 108797888@qq.com
DOI:10.12201/bmr.202606.00048
The Role and Research Progress of CCR8-positive Regulatory T Cells in the Immune Microenvironment of Colorectal Cancer
Corresponding author: GONG Ping, 108797888@qq.com
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摘要:结直肠癌(colorectal cancer,CRC)中,微卫星稳定型患者对免疫检查点抑制剂(immune checkpoint inhibitor,ICI)应答不佳,主要是由于肿瘤免疫微环境(tumor immune microenvironment,TIME)的高度免疫抑制。调节性T细胞(regulatory t cells,Tregs)是TIME中的关键抑制细胞,而CCR8在肿瘤浸润Treg上特异性高表达,在外周Treg及常规T细胞中表达极低,是理想的选择性治疗靶点。CCR8?Treg通过抑制CD8?细胞毒性T细胞和Th1免疫应答,并调控树突状细胞功能,维持TIME的免疫抑制状态。CRC组织中CCR8?Treg浸润水平与TNM分期、淋巴结转移及不良预后显著正相关。靶向CCR8的单克隆抗体可选择性清除肿瘤内Treg,恢复抗肿瘤免疫,与PD-1阻断剂联合展现出协同效应。因此,CCR8?Treg是CRC免疫逃逸的关键驱动因素,靶向CCR8的策略有望突破微卫星稳定型CRC的免疫治疗瓶颈,具有广阔的临床前景。
Abstract: In colorectal cancer , patients with microsatellite-stable tumors respond poorly to immune checkpoint inhibitors , primarily due to the highly immunosuppressive nature of the tumor immune microenvironment. Regulatory T cells (Tregs) are key suppressive cells within the TIME. CCR8 is specifically and highly expressed on tumor-infiltrating Tregs, while its expression on peripheral Tregs and conventional T cells is extremely low, making it an ideal selective therapeutic target. CCR8? Tregs maintain the immunosuppressive state of the TIME by inhibiting CD8? cytotoxic T cells and Th1 immune responses, as well as modulating dendritic cell function. The infiltration level of CCR8? Tregs in CRC tissues is significantly positively correlated with TNM stage, lymph node metastasis, and poor prognosis. Monoclonal antibodies targeting CCR8 can selectively deplete intratumoral Tregs, thereby restoring anti-tumor immunity, and exhibit synergistic effects when combined with PD-1 blockade in preclinical models. Therefore, CCR8? Tregs are key drivers of immune evasion in CRC, and CCR8-targeting strategies hold promise to overcome the immunotherapy bottleneck in MSS CRC, offering broad clinical prospects.
Key words: Colorectal cancer; Tumor immune microenvironment; Regulatory T cells; CCR8; Targeted therapy提交时间:2026-06-12
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序号 提交日期 编号 操作 1 2026-05-20 10.12201/bmr.202606.00048V1
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