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持续的巨细胞重编程是 CD8+ T 细胞依赖的长期瘤根除所需的

Carolina Jardim^1,2, Marta Bica^1,2, Mariana Reis-Sobreiro¹

¹Gulbenkian Institute for Molecular Medicine, Lisbon, Portugal.

Cancer immunology research

|June 5, 2025

概括

使用TLR3和CD40激动剂的髓状细胞治疗 (MCT) 重新编程与瘤相关的巨细胞 (TAMs) 来对抗乳腺癌. 重复的MCT维持了这种抗瘤效果,激活CD8+T细胞以长期消除瘤.

科学领域:

免疫学免疫学免疫学
在瘤学瘤学.
癌症研究癌症研究

背景情况:

瘤相关巨细胞 (TAMs) 在癌症中起着复杂的作用,影响瘤进展和免疫反应.
了解抗瘤TAMs的特定功能状态和分子驱动因素至关重要,但具有挑战性.

研究的目的:

调查结合TLR3和CD40激动剂治疗 (骨髓细胞治疗,MCT) 的潜力,以将TAM重编程为抗瘤表型.
阐明TAM重编程背后的时间动态和分子机制及其对瘤回归的影响.

主要方法:

在 ортотоп性小鼠乳腺癌模型中,对TLR3和CD40激动剂进行内注射.
在治疗后的不同时间点对TAMs的单细胞RNA测序.
免疫细胞激活的分析,特别是CD8+ T细胞,以及瘤根除.

主要成果:

MCT诱导了一种短暂的抗瘤TAM表型,其特征是特定的标记物 (例如,iNOS,CD38) 在12小时达到峰值.
这种表型在72小时内转移到具有混合瘤促进和限制特征的TAM.
为了保持抗瘤TAM状态,需要重复使用MCT,从而导致CD8+T细胞激活和瘤根除.
活性氧物种和TNF-α被确定为TAM驱动瘤控制的关键媒介.

结论:

通过MCT对TAM进行抗瘤重编程是暂时的,这突显了这种治疗方法的脆弱性.
持续的抗瘤免疫力和瘤根除可以通过重复使用MCT来实现,克服TAM重编程的短暂性质.
这项研究提供了对操纵TAMs进行有效的癌症免疫治疗的见解.

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