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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
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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-
of the transferrin cycle[J]. Proc Natl Acad Sci U S A,
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
(3):353-359.
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