Magnetic DNA Vector Constructed
from PDMAEMA Polycation and PEGylated Brush-Type Polyanion with Cross-Linkable
Shell
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Abstract
A novel magnetic-responsive complex composed of polycation,
DNA, and polyanion has been constructed via electrostatic interaction.
The magnetic nanoparticles (MNPs) were first coated with a polycation,
poly[2-(dimethylamino)ethyl methacrylate] end-capped with cholesterol
moiety (Chol-PDMAEMA<sub>30</sub>), and then binded with DNA through
electrostatic interaction; the complexes were further interacted with
the brush-type polyanion, namely poly[poly(ethylene glycol)methyl
ether methacrylate]-<i>block</i>-poly[methacrylic acid carrying
partial mercapto groups] (PPEGMA-<i>b</i>-PMAA<sub>SH</sub>). The resulting magnetic particle/DNA/polyion complexes could be
stabilized by oxidizing the mercapto groups to form cross-linking
shell with bridging disulfide (S–S) between PPEGMA-<i>b</i>-PMAA<sub>SH</sub> molecular chains. The interactions among
DNA, Chol-PDMAEMA coated MNPs, and PPEGMA-<i>b</i>-PMAA<sub>SH</sub> were studied by agarose gel retardation assay. The complexes
were fully characterized by means of zeta potential, transmission
electron microscopy (TEM), dynamic light scattering (DLS) measurements,
cytotoxicity assay, antinonspecific protein adsorption, and <i>in vitro</i> transfection tests. All these results indicate
that this kind of magnetic-responsive complex has potential applications
for gene vector