工程化T细胞-激动剂嵌合体实现逻辑门控STING激活并增强肿瘤免疫治疗
Engineered T cell–agonist chimera for logic-gated STING activation and augmented cancer immunotherapy
摘要
该研究针对实体瘤免疫抑制微环境限制过继T细胞疗效的问题,先证实激活肿瘤相关巨噬细胞(TAM)中的STING可增强过继T细胞的瘤内浸润与细胞毒性;进而设计TAM靶向纳米激动剂,并通过共价表面锚定构建T细胞-激动剂嵌合体(SNTC),使STING激动剂与过继T细胞同步分布。纳米激动剂响应T细胞表面升高的还原电位在瘤内局部释放,再经胞内谷胱甘肽介导在TAM中恢复STING激动剂,实现AND逻辑门控激活。SNTC重塑肿瘤基质与免疫抑制微环境,并增强TAM抗原提呈以激活内源T细胞;黑色素瘤小鼠中60天以上生存率超过40%,与免疫检查点阻断联用可使原位胰腺癌模型肿瘤持续消退。
原文摘要
The efficacy of adoptive T cell therapy against solid tumors is markedly hindered by the immunosuppressive microenvironment. Here, we demonstrate that stimulator of interferon genes (STING) activation in tumor-associated macrophages (TAM) enhances the intratumoral infiltration and cytotoxicity of adoptive T cells. We next design a TAM-targeted nanoagonist and engineer a T cell – agonist chimera (SNTC) via covalent surface anchoring, to achieve synchronized biodistribution of STING agonist with adoptive T cells. The nanoagonist is locally released in tumor tissue in response to the elevated reduction potential on T cell surface, followed by intracellular glutathione-mediated restoration of STING agonist in TAM, thereby enabling AND logic-gated STING activation. SNTC not only reshapes tumor stroma and immunosuppressive tumor microenvironment to augment adoptive T cell function but also enhances the antigen presentation ability of TAM to activate endogenous T cells. SNTC elicits robust antitumor efficacy in melanoma tumor-bearing mice, resulting in over 40% survival beyond 60 d. Moreover, combining tumor-infiltrating T lymphocyte (TIL)-based SNTC with immune checkpoint blockade therapy leads to sustained tumor regression in mouse model of orthotopic pancreatic tumor. Collectively, SNTC holds translational potential to optimize STING activation for adoptive T cell therapy of cancer.
推荐理由:逻辑门控的T细胞-纳米激动剂嵌合体设计在肿瘤免疫治疗中颇具新意,但研究对象为黑色素瘤与胰腺癌模型,与生殖医学、辅助生殖及胚胎多组学无实质关联,对本领域读者参考价值很低。
文献解读
尚未生成。