in vivo Targeted delivery of plasmid DNA into the lung of mice by magnetic nanoparticles of chitosan and CombiMag

Trachea of mice were injected with magnetic complexes of CombiMag and chitosan. A magnet was then placed on the thorax with an adhesive for 72 h to target plasmid delivery.

The Magnetofection technology (OZ Biosciences) to is the only method allowing targeting plasmid delivery in vivo with high efficiency.

article reference: Journal of Nanotechnology, volume 2014, 2014

Magnetic Nanoparticles of Chitosan for Targeted Delivery System of Plasmids to the Lungs

Cynthia Aracely Alvizo Báez, Itza Eloisa Luna Cruz, Maria Cristina Rodríguez Padilla, and Juan Manuel Alcocer González
Abstract
One of the major problems of gene therapy is the efficient, specific, and targeted delivery as well as the safety of the materials used in such systems. The specific targeted delivery of genes to the lung offers the possibility to treat a variety of specific diseases. We developed chitosan nanoparticles with the plasmid pCEM-Luc, which contains a promoter activated by magnetic field. Nanoparticles of 200–250 nm obtained by ionic gelation with a 99% retention rate were transfected in B16F10 cells and in vivo in the lungs of Balb/c mice by intratracheal administration. We observed that an external magnetic field increased the expression of the luciferase reporter gene in B16F10 cells transfected with magnetic nanoparticles and in homogenized lungs of mice which determined differences in levels of expression between different regions of the lungs (apical or distal and left or right). The highest levels of luciferase activity were observed in the apical left region. The magnetic nanoparticles prove an efficient delivery system to in vitro transfection of cells and lung tissue.

In vivo MagnetoFection™ has been developed for in vivo targeted transfection of various types of nucleic acids such as DNA, RNA, oligonucleotides or transduction with any viral vectors.