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CD9 monoclonal antibody-conjugated PEGylated liposomes for targeted delivery of rapamycin in the treatment of cellular senescence

机译:CD9单克隆抗体 - 缀合的聚乙二醇化脂质体,用于靶向雷帕霉素治疗细胞衰老

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aPremature cellular senescence refers to the state of irreversible cell cycle arrest due to DNA damage or other stresses. In this study, CD9 monoclonal antibody (CD9mAb) was successfully conjugated to the surface of PEGylated liposomes for targeted delivery of rapamycin (LRCD9mAb) to overcome senescence of CD9 receptor-overexpressing cells. LR-CD9mAb has a small particle size (143.3 +/- 2.4 nm), narrow size distribution (polydispersity index: 0.220 +/- 0.036), and negative zeta potential (-14.6 +/- 1.2 mV). The uptake of CD9-targeted liposomes by premature senescent human dermal fibroblasts (HDFs) was higher than that by young HDFs, as displayed by confocal microscopic images. The senescence might not be reversed by treatment with rapamycin; however, the drug promoted cell proliferation and reduced the number of cells that expressed the senescence-associated-beta-galactosidase (SA-beta gal). These effects were further confirmed by cell viability, cell cycle, and Western blotting analyses. Moreover, CD9-targeted liposomes showed better anti-senescence activity, in comparison with free rapamycin or the conventional liposomal formulation, suggesting the potential application of this system in further in vivo studies.
机译:Apremature细胞衰老是指因DNA损伤或其他应力而导致的不可逆细胞周期停滞状态。在该研究中,CD9单克隆抗体(CD9MAB)与聚乙二醇化脂质体的表面成功缀合,用于靶向雷帕霉素(LRCD9MAB)以克服CD9受体过表达细胞的衰老。 LR-CD9Mab具有小的粒径(143.3 +/- 2.4 nm),窄尺寸分布(多分散指数:0.220 +/- 0.036),以及负Zeta电位(-14.6 +/- 1.2 mV)。通过过早的衰老人的皮肤成纤维细胞(HDF)的CD9靶向脂质体的摄取高于共聚焦微观图像显示的幼高HDFS。雷帕霉素治疗可能不会逆转衰老;然而,药物促进细胞增殖并减少表达衰老相关β-半乳糖苷酶(SA-Beta GAL)的细胞数量。通过细胞活力,细胞周期和蛋白质印迹分析进一步证实了这些效果。此外,CD9靶向脂质体显示出更好的抗衰老活性,与游离雷帕霉素或常规的脂质体制剂相比,表明在进一步的体内研究该系统中的潜在的应用。

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