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融合外泌体囊泡负载大麻二酚通过线粒体自噬抑制胶质瘤增殖

Cannabidiol-loaded hybrid exosome vesicles inhibit glioma proliferation via mitophagy

  • 摘要: 本研究旨在探讨由U87与RAW264.7细胞外泌体融合制备的外泌体囊泡(RU-exos)作为大麻二酚(cannabidiol, CBD)递送系统,跨越血脑屏障(BBB)并靶向胶质母细胞瘤(glioblastoma, GBM),进而通过调控线粒体自噬途径发挥抗肿瘤作用的潜力。采用透射电镜(TEM)、动态光散射和Zeta电位对RU-exos@CBD进行表征;通过DCFH-DA探针检测细胞内活性氧(ROS)水平,JC-1探针评估线粒体膜电位(MMP)变化,Western blot分析线粒体自噬相关蛋白表达。此外,建立裸鼠颅内原位GBM模型,评估RU-exos@CBD的体内靶向性、疗效及生物安全性;采用免疫组化(IHC)与免疫荧光(IF)检测肿瘤细胞增殖情况。实验结果显示,RU-exos@CBD处理导致细胞内ROS积累、MMP下降,初步证实了线粒体自噬的发生。进一步机制研究表明,RU-exos@CBD通过抑制PI3K/AKT/mTOR通路激活线粒体自噬。体内实验证实,RU-exos@CBD可有效跨越BBB并富集于肿瘤区域,相较于游离CBD,显著增强对GBM增殖的抑制作用。重要器官的HE染色结果显示未见明显病理损伤,表明RU-exos@CBD具有良好的生物安全性及组织相容性。

     

    Abstract: This study explores the potential of hybrid exosome vesicles (RU-exos) prepared by fusion of U87 and RAW264.7 cell-derived exosomes as a delivery system for cannabidiol (CBD) to cross the blood-brain barrier (BBB) and target glioblastoma (GBM). thereby exerting antitumor effects through the modulation of mitophagy pathways. RU-exos@CBD were characterized using transmission electron microscopy (TEM), dynamic light scattering, and Zeta potential measurements. Intracellular reactive oxygen species (ROS) levels were detected using the DCFH-DA probe, changes in mitochondrial membrane potential (MMP) were assessed with the JC-1 probe, and the expression of mitophagy-related proteins was analyzed by Western blot. Additionally, an orthotopic GBM model in nude mice was established to evaluate the in vivo targeting ability, therapeutic efficacy, and biosafety of RU-exos@CBD. Immunohistochemistry (IHC) and immunofluorescence (IF) were used to examine tumor cell proliferation. Experimental results showed that RU-exos@CBD treatment led to intracellular ROS accumulation and a decrease in MMP, preliminarily confirming the induction of mitophagy. Further mechanistic studies revealed that RU-exos@CBD activates mitophagy by inhibiting the PI3K/AKT/mTOR pathway. In vivo experiments demonstrated that RU-exos@CBD effectively crosses the BBB and accumulates in tumor regions, significantly enhancing the inhibition of GBM proliferation compared with free CBD. Hematoxylin and eosin (H&E) staining of major organs revealed no significant pathological damage, indicating that RU-exos@CBD possesses favorable biosafety and tissue compatibility.

     

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