肥胖会诱导巨细胞的PD-1抑制抗瘤免疫力
Jackie E Bader1, Melissa M Wolf1, Gian Luca Lupica-Tondo1
1Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA.
Nature
|June 12, 2024
概括
肥胖会诱导与瘤相关的巨细胞 (TAMs) 的PD-1表达,从而降低抗瘤免疫力. 阻断PD-1可增强巨细胞代谢和T细胞激活,改善肥胖患者的癌症免疫治疗反应.
科学领域:
- 免疫学
- 癌症学
- 代谢过程
背景情况:
- 肥胖是癌症进展和转移的主要危险因素.
- 肥胖症可以改善免疫检查点阻断疗法如抗PD-1的存活率和反应.
- 免疫系统在肥胖与癌症的联系和免疫治疗中的作用尚未完全理解.
研究的目的:
- 在肥胖驱动的癌症中研究编程细胞死亡蛋白1 (PD-1) 对瘤相关巨细胞 (TAM) 的作用.
- 阐明肥胖对TAMs的PD-1表达及其功能后果的影响机制.
- 探索PD-1阻断在与肥胖相关的癌症中的治疗潜力.
主要方法:
- 使用肥胖相关的炎症性细胞因子和代谢因子 (干扰素-γ,TNF,素,胰岛素,棕酸盐) 诱导巨细胞的PD- 1表达.
- 评估PD-1信号通路,包括mTORC1和糖解.
- 分析TAM功能,包括糖解,细胞和T细胞刺激能力.
- 在患有骨髓特异性PD-1缺陷的小鼠中评估瘤生长,免疫细胞活性和疲劳标记.
主要成果:
- 通过mTORC1和糖解选择性诱导TAMs上的PD-1表达.
- 在TAM中,PD-1抑制了它们的糖解,细胞和T细胞激活潜力.
- 增强了TAM糖解和抗原呈现,促进了T细胞的激活.
- 骨髓细胞特异性PD- 1 缺乏减少了瘤生长和增强了抗瘤免疫力.
结论:
- 与肥胖相关的代谢和炎症信号驱动TAM中的PD-1表达.
- 这种PD-1表达会产生反循环, 损害瘤的免疫监测.
- 在TAM中准PD-1为改善肥胖患者癌症免疫治疗提供了潜在的策略.
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