具有NIR开关的DNA快门可实现可逆间歇cGAS-STING激活,增强抗瘤免疫力
Shiyi Bi1, Ruowen Yang1, Yulin Cong1
1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
Journal of the American Chemical Society
|August 18, 2025
概括
这项研究引入了间歇性STING激动剂用于免疫治疗. 这种新的方法使用可逆激活来增强免疫反应和瘤细胞杀死,克服与持续途径刺激相关的抵抗.
科学领域:
- 免疫学
- 生物技术
- 材料科学
背景情况:
- 循环GMP-AMP合成酶 (cGAS) 刺激干扰素基因 (STING) 激动剂对免疫治疗具有前景.
- 持续激活STING通路可能导致免疫抵抗和逃避,从而限制治疗效果.
- 暂时休息可以恢复免疫功能并减轻副作用.
研究的目的:
- 为可逆cGAS-STING通路激活开发间歇性STING激动剂.
- 在免疫治疗中研究"刺激-暂停"模式的治疗潜力.
- 通过控制免疫反应增强免疫治疗效率和瘤细胞杀死.
主要方法:
- 合成了近红外 (NIR) 可切换的可逆DNA快门 (NIR-DNA快门) 使用上转化纳米粒子 (UCNP) 和使用阿佐 (Azo) 的DNA链.
- 使用变动功率的808nm辐射来控制UCNP的上转化发射,诱导*trans*-Azo异构化 (ON) 或*cis*-Azo异构化 (OFF).
- 通过切换NIR辐射功率,编程cGAS-STING通路以重复的"激活-休息"间隔.
主要成果:
- 通过在UCNP上组装/拆卸dDNA链,NIR-DNA关闭器可逆控制cGAS-STING通路.
- 与持续激活相比,间歇性STING激活显示出更高的治疗效果.
- 治疗重塑了免疫微环境并增强了瘤细胞的杀死.
结论:
- 通过NIR-DNA关闭间歇性STING激活是克服耐药性和改善免疫治疗结果的有效策略.
- 可逆控制cGAS-STING通路提供了增强的治疗潜力和减少的副作用.
- 这种方法为癌症治疗中的免疫反应提供了一种新的方法.
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