单细胞转录组分析揭示了通过调节瘤微环境的肠道微生物群-免疫疗法协同作用
Minyuan Cao1,2, Yun Deng2, Qing Hao2
1Department of Laboratory Medicine/Research Centre of Clinical Laboratory Medicine, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China.
Signal transduction and targeted therapy
|May 1, 2025
概括
肠道微生物群通过促进T细胞反应和重编程瘤相关巨细胞 (TAMs) 来增强免疫检查点抑制剂 (ICI) 免疫疗法. 这种协同作用涉及 γδ T 细胞-APC-CD8+ T 细胞轴,改善抗瘤免疫力.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 癌症研究 癌症研究
背景情况:
- 免疫检查点抑制剂 (ICI) 是重要的癌症疗法,但它们的疗效受肠道微生物群的影响.
- 导致肠道微生物群-ICI协同作用的精确单细胞机制在很大程度上是未知的.
- 了解这些机制对于优化免疫治疗结果至关重要.
研究的目的:
- 在单细胞水平上研究肠道微生物群和ICI对瘤微环境 (TME) 的协同效应.
- 为了阐明参与这种协同作用的细胞相互作用和分子途径.
- 确定增强免疫疗法的潜在治疗点.
主要方法:
- 在小鼠模型中对TME进行单细胞RNA测序 (scRNA-seq).
- 验证研究包括便微生物群移植和特定细胞群 (Spp1+ TAMs) 的遗传枯竭.
- 对细胞相互作用,代谢途径和信号级联 (例如NF-κB) 的分析.
主要成果:
- 结合肠道微生物群和ICI增加了CD8 +,CD4 +和γδ T细胞,减少了糖解,并逆转了CD8 + T细胞枯竭.
- 从M2 Spp1+ TAMs到Cd74+ APCs发生了巨细胞重编程,这些亚型之间存在负相关性.
- 不管微生物群的状况如何,Spp1+ TAMs的耗尽提高了ICI的有效性和T细胞的透.
- 一个拟议的γδ T细胞-APC-CD8+ T细胞轴通过CD40-CD40L和CD86-CD28相互作用调解了协同作用.
结论:
- 肠道微生物群和ICI通过调节TME细胞组成和功能来协同增强抗瘤反应.
- Spp1+ TAMs对免疫治疗有负面影响,而Cd74+ TAMs可能会作为有益的APCs.
- 向γδ T细胞-APC-CD8+T细胞轴和巨细胞重编程是改善ICI治疗的有希望的策略.
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