从其免疫复合体中剥离无细胞DNA对于使用DNase I控制炎症至关重要
Shi Chen1, Yibo Du1, Chenxu Zhu1
1School of Materials Science and Engineering, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Sun Yat-sen University, Guangzhou, 510275, Guangdong, China.
Biomaterials
|January 11, 2026
概括
过多的无细胞DNA (cfDNA) 驱动自身免疫性疾病. 肝素和工程DNase纳米粒子 (DNase@TANP) 协同降解cfDNA-免疫综合体,减少炎症和改善类风湿性关节炎模型.
科学领域:
- 免疫学 免疫学 免疫学
- 生物化学 生物化学
- 纳米技术 纳米技术
背景情况:
- 累积的无细胞DNA (cfDNA) 是自身免疫性疾病的关键因素.
- 循环脱氧核糖核酶 (DNase) 被抑制,cfDNA与LL37等一起形成免疫复合体 (IC),阻碍DNase活动并促进炎症.
- 这些ICs (LL37-DNA) 通过形成三元复合体来禁用DNase I,从而损害其在炎症环境中的功能.
研究的目的:
- 研究LL37-DNA免疫复合体对DNase抑制的机制.
- 开发一种策略,以恢复自身免疫条件下的cfDNA降解.
- 评估结合肝素与持续释放DNase配方在类风湿关节炎模型中的治疗潜力.
主要方法:
- 在实验室中研究了LL37-DNA复合体和DNase I之间的相互作用.
- 测试了氨酸在破坏ICs和恢复cfDNA降解方面的有效性.
- 工程DNase纳米粒子 (DNase@TANP) 用于持续的酶释放.
- 在原诱导性关节炎小鼠模型中进行了连续的氨酸和DNase@TANP治疗.
主要成果:
- LL37-DNA复合体通过三元复合体的形成,使得DNase I无法进入,并通过三元复合体的形成诱导其失活.
- 氨酸破坏了LL37-DNAICs,促进了cfDNA的降解,并在体外抑制了TLR9的激活.
- 在RA模型中,顺序给予氨酸和DNase@TANP协同降解cfDNA,抑制TLR介导的炎症,改善关节炎症.
结论:
- 在炎症环境中,LL37-DNA免疫复合体显著损害了DNase I活性.
- 氨酸与持续释放的DNase纳米颗粒相结合,为cfDNA清除提供了一个有希望的策略.
- 这种方法有效地准了cfDNA驱动的炎症,并显示了对类风湿性关节炎等自身免疫性疾病的治疗潜力.
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