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Blood:阻断CTLA-4或可成为对阻断PD-1耐受的cHL患者的新治疗方向

2019-10-14 MedSci MedSci原创

经典霍奇金淋巴瘤(cHL)是一种罕见的由非典型生发中心来源的B细胞(HRS细胞)构成的肿瘤;HRS细胞嵌在一个健壮但无效的炎症环境中。cHL肿瘤微环境(TME)被分割成富含PD-L1阳性HRS细胞和肿瘤相关巨噬细胞(TAMs)的“壁龛”,与PD-1阳性T细胞结合,通过PD-L1/PD-1信号通路抑制抗肿瘤免疫。虽然cHL对PD-1检查点阻断非常敏感,但大多数患者最终会复发,需要其他治疗方案。采用多

经典霍奇金淋巴瘤(cHL)是一种罕见的由非典型生发中心来源的B细胞(HRS细胞)构成的肿瘤;HRS细胞嵌在一个健壮但无效的炎症环境中。cHL肿瘤微环境(TME)被分割成富含PD-L1阳性HRS细胞和肿瘤相关巨噬细胞(TAMs)的“壁龛”,与PD-1阳性T细胞结合,通过PD-L1/PD-1信号通路抑制抗肿瘤免疫。虽然cHL对PD-1检查点阻断非常敏感,但大多数患者最终会复发,需要其他治疗方案。

采用多重免疫荧光显微镜数字图像分析,研究人员发现与反应性淋巴组织相比,cHL高度富集非调节CTLA-4阳性T细胞,其数量甚至超过了PD-1和LAG-3阳性T细胞。此外,接触HRS细胞的T细胞中,CTLA-4阳性率远高于PD-1或LAG-3的阳性率高。

此外,研究人员进一步发现,HRS细胞和TAMs的一种亚型,对CTLA-4配体CD86呈阳性,而CTLA-4阳性和CD86阳性的T细胞和TAMs在75um HRS细胞壁龛内的占比也明显多于该区域以外的区域。重要的是,在经过包括PD-1阻断在内的多种治疗后,复发性cHL肿瘤中常存在CTLA-4阳性细胞和局部接触的HRS细胞。

综上所述,本研究表明CTLA-4:CD86相互作用是围绕HRS细胞的免疫优势壁龛的组成部分,并增加了对PD-1阻断难以治愈的cHL患者可能受益于CTLA-4阻断的可能性。

原始出处:

Sanjay S. Patel, et al.The microenvironmental niche in classic Hodgkin lymphoma is enriched for CTLA-4- positive T-cells that are PD-1-negative.blood.2019002206. https://doi.org/10.1182/blood.2019002206

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    2019-10-16 hywen7328

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