Synthesis of a new potential biodegradable disulfide containing poly(ethylene imine)–poly(ethylene glycol) copolymer cross-linked with click cluster for gene delivery
摘要:
Poly(ethylene glycol)-grafted-polyethylenimine (PEG-PEI) are promising non-viral gene delivery systems. Herein, we aimed to synthesize a biodegradable disulfide containing PEGylated PEI to attempt to reduce its cytotoxicity and enhance the gene transfer activity. Using click chemistry, low Mw PEI (br. 2 kDa) and short chain length PEG (tetraethylene glycol, TEG) were cross-linked to a high Mw PEG-PEI copolymer (similar to 22 kDa). The chemical structure of the copolymer was characterized using H-1 NMR and GPC The degradation behavior was investigated under in vitro conditions in the presence of 1,4-dithiothreitol (DTT). The gel retardation assay, dynamic light scattering and atomic force microscopy showed good DNA condensation ability by forming polyplexes with small particle size and positive zeta potential. In particular, MTT assay indicated that this PEG-PEI polymer is about 22-fold less toxic than PEI 25k and only 2-fold more toxic than PEI 2k in L929 cell line. After coupling of small PEG chains and cross-linking by disulfide bridges, the transfection efficiency is increased approximately 6-fold in comparison to PEI 2k and still reaches approximately 17% of PEI 25k. Hence, this click cluster cross-linked disulfide containing PEG-PEI copolymer could be an attractive cationic polymer for non-viral gene delivery. (C) 2011 Elsevier B.V. All rights reserved.
Miktoarm star conjugated multifunctional gold nanoshells: synthesis and an evaluation of biocompatibility and cellular uptake
作者:Vanessa W. K. Ng、Pramod K. Avti、Mathieu Bédard、Tina Lam、Léonie Rouleau、Jean-Claude Tardif、Éric Rhéaume、Frédéric Lesage、Ashok Kakkar
DOI:10.1039/c4tb00722k
日期:——
multifunctional GNS contain lipoic acid (LA) as a model therapeutic agent, poly(ethylene glycol) (PEG350) as a solubilizing and stealth agent, and tetraethylene glycol (TEG) with a terminally conjugated thiol moiety. These GNS have an average size of 40 nm, a shell thickness of 6 nm, a well-defined crystal structure lattice (111), and a surface absorption plasmon band in the near infrared (NIR) region
Development of a Hypoxia-Selective Near-Infrared Fluorescent Probe for Non-invasive Tumor Imaging
作者:Bahaa Gamal Mohamed Youssif、Kensuke Okuda、Tetsuya Kadonosono、Ola Ibrahim Abdel Razek Salem、Alaa Arafat Mohamed Hayallah、Mostafa Ahmed Hussein、Shinae Kizaka-Kondoh、Hideko Nagasawa
DOI:10.1248/cpb.60.402
日期:——
A near-infraredfluorochrome, GPU-311, was designed, synthesized and evaluated for its application in non-invasive imaging of tumor hypoxia. Efficient synthesis was achieved by nucleophilic substitution and click chemistry ring using the bifunctional tetraethylene glycol linker 2 containing thiol and azide groups for the conjugation of the propargylated nitroimidazole 1 and the heptamethine cyanine
设计,合成和评估了近红外荧光染料GPU-311在肿瘤缺氧的非侵入性成像中的应用。通过使用含有硫醇和叠氮基团的双功能四乙二醇接头2进行亲核取代和点击化学环,可实现高效合成,以使炔丙基化的硝基咪唑1和带有2-氯-1-环己烯基环的七甲基花青染料3缀合。GPU-311表现出长激发和发射波长(Ex / Em = 785/802 nm)和适度的量子产率(0.05)。GPU-311的水溶性和亲水性增加。用GPU-311体外处理SUIT-2 / HRE-Luc胰腺癌细胞后,在缺氧条件下选择性观察到的荧光水平高于在常氧条件下。然而,
HETEROBIFUNCTIONAL LINKER
申请人:THE GOVERNORS OF THE UNIVERSITY OF ALBERTA
公开号:US20180086724A1
公开(公告)日:2018-03-29
The present disclosure relates generally to heterobifunctional linkers.