爱斯坦-巴尔病毒 (EBV) 阴性免疫微环境与EBV相关的胃癌相比:对免疫疗法的影响
Tracee L McMiller1,2, Sepideh Besharati3, Mark Yarchoan2,4
1Department of Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.
Journal for immunotherapy of cancer
|November 21, 2024
概括
与埃普斯坦-巴尔病毒相关的胃癌 (EBV+GCs) 与EBV阴性GCs (EBV-GCs) 相比,表现出不同的免疫微环境. EBV-GCs显示了循环氧基因酶-2/前列腺素E2通路的表达增加,提供了潜在的治疗点.
科学领域:
- 在瘤学瘤学.
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
背景情况:
- 胃癌 (GC) 具有侵略性,对抗编程细胞死亡 (连接体) 1 (PD-(L) 1) 治疗的反应有限.
- 爱斯坦-巴尔病毒相关的GCs (EBV+GCs) 由于PD-L1/PD-L2放大和CD8+T细胞透,对抗PD-1治疗的响应率更高.
- 这项研究比较了EBV+和EBV-GCs的瘤免疫微环境 (TiMEs).
研究的目的:
- 为了比较埃普斯坦-巴尔病毒阳性 (EBV+) 与EBV阴性 (EBV-) 胃癌 (GC) 的瘤免疫微环境 (TiMEs).
- 确定EBV+和EBV-GC之间的免疫细胞子集,协同调节分子和基因表达特征的差异.
- 探索潜在的治疗点,以克服GC中抗PD-L1疗法的耐药性.
主要方法:
- 对1000多个初级侵入性GC标本进行查,以选择25个未经治疗的样本 (11 EBV+,14 EBV-).
- 免疫细胞标记物和共同调节分子的定量免疫组织化学 (IHC).
- 用多重定量逆转录酶PCR对122个与免疫相关的基因进行CD3+T细胞透的基因表达概况 (GEP).
主要成果:
- 在EBV+ GC中,CD8+ T细胞密度较高,ITGAE,CXCL9和IDO1.1的过度表达.
- EBV-GCs过度表达的基因与髓状细胞,免疫抑制性细胞因子/化学因子,共抑制分子 (TIM-3,VISTA) 和腺路组件 (CD39,CD73) 相关.
- EBV-GCs显示了循环氧化酶2 (COX-2) /前列腺素E2 (PGE2) 途径的显著过度表达,包括PTGS2/COX-2,PTGER1/EP1,PTGER4/EP4和IL1B,并趋向于更高的COX-2蛋白表达.
结论:
- 虽然EBV+和EBV-GC共享一些免疫抑制标记,但EBV-GC (更常见) 明显过度表达COX-2/PGE2通路.
- 这些发现为EBV+和EBV-GC的独特TiME提供了新的见解.
- 已确定的途径,特别是EBV-GC中的COX-2/PGE2,代表了增强抗PD-L1治疗疗效的潜在目标.
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