title: Polyethylenimine functionalized magnetic nanoparticles as a potential non-viral vector for gene delivery.
abstract: Polyethylenimine (PEI) functionalized magnetic nanoparticles were synthesized as a potential non-viral vector for gene delivery. The nanoparticles could provide the magnetic-targeting, and the cationic polymer PEI could condense DNA and avoid in vitro barriers. The magnetic nanoparticles were characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, dynamic light scattering measurements, transmission electron microscopy, vibrating sample magnetometer and atomic force microscopy. Agarose gel electrophoresis was used to asses DNA binding and perform a DNase I protection assay. The Alamar blue assay was used to evaluate negative effects on the metabolic activity of cells incubated with PEI modified magnetic nanoparticles and their complexes with DNA both in the presence or absence of an external magnetic field. Flow cytometry and fluorescent microscopy were also performed to investigate the transfection efficiency of the DNA-loaded magnetic nanoparticles in A549 and B16-F10 tumor cells with (+M) or without (-M) the magnetic field. The in vitro transfection efficiency of magnetic nanoparticles was improved obviously in a permanent magnetic field. Therefore, the magnetic nanoparticles show considerable potential as nanocarriers for gene delivery.
authors: School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan, People's Republic of China.
authors: Yangbo
authors: Y
authors: Zhou
authors: Zhaomin
authors: Z
authors: Tang
authors: Chunli
authors: C
authors: Shi
authors: Shuai
authors: S
authors: Shi
authors: Zhiyong
authors: Z
authors: Qian
authors: Shaobing
authors: S
authors: Zhou
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D004247:DNA / Q000737:chemistry; D004587:Electrophoresis, Agar Gel; D005822:Genetic Vectors; D006801:Humans; D008280:Magnetics; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D011094:Polyethyleneimine / Q000737:chemistry*; D033362:Powder Diffraction; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D014162:Transfection
chemical_list: D011094:Polyethyleneimine; D004247:DNA