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4 讨论                                                     nanoparticle vectors[J]. Eur J Pharm Biopharm,2008,68
              本课题采用薄膜分散法制备了 7pep-PEG-PCL-C6                       (3):676-687.
          胶束以及 PEG-PCL-C6 胶束,结果显示,两种胶束的粒                      [ 3 ]  SPRINGER  A  D,DOWDY  S  F.  GalNAc-siRNA  conju‐
          径差别不大,均在80 nm左右,且分布均匀,外观相似,可                             gates:leading the way for delivery of RNAi therapeutics
          以用于后续细胞转运机制的比较研究。                                        [J]. Nucleic Acid Ther,2018,28(3):109-118.
              纳米给药系统入胞后的经典路线是先进入 EE(特                         [ 4 ]  HARFORD J,BRIDGES K,ASHWELL G,et al. Intracel‐
          异性标记物为 Rab5 蛋白),然后是 ERC(特异性标记物                           lular dissociation of receptor-bound asialoglycoproteins in
                                                                   cultured hepatocytes: a pH-mediated nonlysosomal event
          为 Rab11B 蛋白),最后是 LE(特异性标记物为 Rab7 蛋
                                                                   [J]. J Biol Chem,1983,258(5):3191-3197.
          白) [9―10] 。本研究采用免疫组化法,利用Rab5、Rab11B以
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          及 Rab7 的特异性抗体对细胞进行免疫荧光染色,同时
                                                                   et al. Binding of apotransferrin to K562 cells:explanation
          结合两种胶束的细胞实时摄取实验结果发现,7pep-
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          PEG-PCL-C6 胶束的入胞速度和入胞量均明显快/多于
                                                                   1983,80(8):2263-2266.
          PEG-PCL-C6 胶束,具有明显的主动靶向特征;7pep-
                                                              [ 6 ]  LIU  W,SU  C,QI Y,et  al.  Brain-targeted  heptapeptide-
          PEG-PCL-C6胶束比PEG-PCL-C6胶束能够更快地进入                         loaded  exosomes  attenuated  ischemia-reperfusion  injury
          EE,但入胞后的PEG-PCL-C6胶束转运进入ERC的速率                           by promoting the transfer of healthy mitochondria from astro-
          较 7pep-PEG-PCL-C6 胶束快,且 PEG-PCL-C6 胶束和                   cytes  to  neurons[J].  J  Nanobiotechnology,2022,20
          7pep-PEG-PCL-C6 胶束在 LE 均有逐渐累积的趋势;不                      (1):242.
          同的是,PEG-PCL-C6胶束进入LE后持续累积,而7pep-                    [ 7 ]  CHENG S Z,TU M L,LIU H X,et al. A novel heptapep‐
          PEG-PCL-C6胶束进入LE后随着时间的延长,皮尔森系                            tide derived from  Crassostrea  gigas  shows  anticoagulant
          数、信号重叠比率、共定位比率均先升高后降低。由此                                 activity by targeting for thrombin active domain[J]. Food
          可见,7pep-PEG-PCL-C6 胶束的胞内转运行为与 PEG-                       Chem,2021,334:127507.
                                                              [ 8 ]  胡洁琳,汪勒,庞良芳 . 脑肿瘤靶向肽 T7 修饰的纳米结
          PCL-C6胶束不同,可能存在LE逃逸情况。
                                                                   构脂质载体的制备和表征[J]. 中国新药杂志,2019,28
              综上所述,靶头7pep修饰可提高PEG-PCL-C6胶束
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          的入胞速率和入胞量,还可以改变其胞内的转运行为。
                                                                   HU J L,WANG L,PANG L F. Preparation and evaluation
          本研究可为今后主动靶向药物递送系统的构建以及临
                                                                   of  brain  tumor  targeting  peptide  T7-modified  nanostruc‐
          床转化提供参考。
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          · 1436 ·    China Pharmacy  2024 Vol. 35  No. 12                            中国药房  2024年第35卷第12期
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