基于PGMA為骨架基因載體的構(gòu)建及其性能研究
[Abstract]:The successful gene vectors need not only high transfection efficiency but also low toxicity. In this study, PGMA was used as skeleton to construct low toxicity and high efficiency gene vector. The experimental contents are as follows: 1. The cationic polymer PGEAwith secondary amines and non-ionic hydrophilic groups was obtained by ring opening reaction of ethanolamine (EA) with linear polyglycidyl methacrylate (PGMA). A series of transfection and toxicity tests showed that PGEA showed high transfection efficiency (higher than or equivalent to PEI) and low cytotoxicity (less than 10% of 25KD PEI) in different cell lines. (2) PGMA was functionalized by different amines (including PGAP1, 3-amino-2-propanol (AP2) functionalized PGAP2; Ethanolamine (EA) functionalized PGEAA, ethanolamine / NN- dimethylethylenediamine (EA-DED) co-functionalized PGEADED functionalized PGDED, quaternary amine-DED (QDED) functionalized QPGDED, and their performance as gene vectors were compared. Compared with EA, AP1 contains an excess methyl and AP2 contains an excess methylene, which makes them have roughly the same condensation ability of DNA and can improve transfection efficiency. The results showed that the transfection efficiency of PGAP1 was the highest in all the materials, and it could be further quaternary amination to increase the surface positive charge and then enhance the ability of condensation DNA. Compared with PGDED, the toxicity of QPGDED was not significantly increased. But DED and quaternary amination QDED will seriously affect the buffer ability of the material, resulting in a decrease in transfection efficiency. The main purpose of this study is to construct the PGMA gene vector. 3. Further improving the degradability and transfection efficiency of PGMA derivative vector will be beneficial to the construction of a better gene transfer system. Comb-type cationic polymer as a non-viral gene vector has been paid attention to. Using ATRP and ring-opening reaction, the degradable PGMA derivative (c-PGEA) with high molecular weight comb shape was prepared. Through a series of characterization, it was proved that the comb c-PGEA carrier had good ability of complexing DNA, low cytotoxicity and good buffer ability. More importantly, c-PGEA vectors can improve the efficiency of gene transfection, and their degradability is conducive to the eventual exclusion of PGEA from human body. In addition, the PGEA side chain of c-PGEA can be copolymerized with some poly (ethylene glycol) ether methacrylate (PEGEEMA) series to further improve the efficiency of gene transfection. The above results indicate that the PGEA series as a cationic gene vector has exceeded the gold standard PEI. Therefore, the cationic gene vector based on PGMA has low toxicity, and high transfection efficiency and degradability will promote the development of efficient gene vector system. It is expected to become a safe and effective gene vector in gene therapy in the future.
【學(xué)位授予單位】:北京化工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2012
【分類號】:R318.08
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