阳离子聚合
促炎细胞因子
内体
TLR9型
化学
炎症
肿瘤坏死因子α
受体
细胞外
药理学
细胞生物学
生物化学
医学
生物
基因表达
免疫学
基因
有机化学
DNA甲基化
作者
Yi-lin Feng,Cong Wei,Yanrong Gu,Hong Zhang,Lixin Liu,Yongming Chen,Tianyu Zhao
标识
DOI:10.1016/j.jconrel.2024.03.003
摘要
Cell-free DNA (cfDNA) released from dead cells could be a player in some autoimmune disorders by activating Toll-like receptor 9 (TLR9) and inducing proinflammatory cytokines. Cationic nanoparticles (cNPs) address cfDNA clearance, yet challenges persist, including toxicity, low specificity and ineffectiveness against endocytosed cfDNA. This study introduced pH-sensitive cNPs, reducing off-target effects and binding cfDNA at inflammatory sites. This unique approach inhibits the TLR9 pathway, offering a novel strategy for inflammation modulation. Synthesized cNPs, with distinct cationic moieties, exhibit varied pKa values, enhancing cfDNA binding. Comprehensive studies elucidate the mechanism, demonstrating minimal extracellular binding, enhanced endosomal DNA binding, and optimal tumor necrosis factor-α suppression. In a traumatic brain injury mice model, pH-sensitive cNPs effectively suppress inflammatory cytokines, highlighting their potential in acute inflammation regulation.
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