TAILIEUCHUNG - báo cáo khoa học: "Optimization of DNA delivery by three classes of hybrid nanoparticle/DNA complexes"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Optimization of DNA delivery by three classes of hybrid nanoparticle/DNA complexes | Zhong et al. Journal of Nanobiotechnology 2010 8 6 http content 8 1 6 JOURNAL OF NANOBIOTECHNOLOGY RESEARCH Open Access Optimization of DNA delivery by three classes of hybrid nanoparticle DNA complexes Qiu Zhong1 Dakshina Murthy Devanga Chinta2 Sarala Pamujula2 Haifan Wang1 3 Xin Yao1 Tarun K Mandal2 Ronald B Luftig1 Abstract Plasmid DNA encoding a luciferase reporter gene was complexed with each of six different hybrid nanoparticles NPs synthesized from mixtures of poly D L-lactide-co-glycolide acid PLGA 50 50 and the cationic lipids DOTAP 1 2-Dioleoyl-3-Trimethyammonium-Propane or DC-Chol 3P N N N -Dimethylaminoethane -carbamyl Cholesterol . Particles were 100-400 nm in diameter and the resulting complexes had DNA adsorbed on the surface out encapsulated in or DNA adsorbed and encapsulated both . A luciferase reporter assay was used to quantify DNA expression in 293 cells for the uptake of six different NP DNA complexes. Optimal DNA delivery occurred for 105 cells over a range of 500 ng - 10 gg of NPs containing 20-30 gg DNA per 1 mg of NPs. Uptake of DNA from NP DNA complexes was found to be 500-600 times as efficient as unbound DNA. Regression analysis was performed and lines were drawn for DNA uptake over a four week interval. NP DNA complexes with adsorbed NPs out showed a large initial uptake followed by a steep slope of DNA decline and large angle of declination lines from uptake of adsorbed and encapsulated NPs both also exhibited a large initial uptake but was followed by a gradual slope of DNA decline and small angle of declination indicating longer times of luciferase expression in 293 cells. NPs with encapsulated DNA only in gave an intermediate activity. The latter two effects were best seen with DOTAP-NPs while the former was best seen with DC-Chol-NPs. These results provide optimal conditions for using different hybrid NP DNA complexes in vitro and in the future will be tested in vivo. Introduction The purpose of this .

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