Plasmid size up to 20 kbp does not limit effective in vivo lung gene transfer using compacted DNA nanoparticles

Gene Therapy
T L FinkM J Cooper

Abstract

Nanoparticles consisting of single molecules of DNA condensed with polyethylene glycol-substituted lysine 30-mers efficiently transfect lung epithelium following intrapulmonary administration. Nanoparticles formulated with lysine polymers having different counterions at the time of DNA mixing have distinct geometric shapes: trifluoroacetate or acetate counterions produce ellipsoids or rods, respectively. Based on intracytoplasmic microinjection studies, nanoparticle ellipsoids having a minimum diameter less than the 25 nm nuclear membrane pore efficiently transfect non-dividing cells. This 25 nm size restriction corresponds to a 5.8 kbp plasmid when compacted into spheroids, whereas the 8-11 nm diameter of rod-like particles is smaller than the nuclear pore diameter. In mice, up to 50% of lung cells are transfected after dosing with a rod-like compacted 6.9 kbp lacZ expression plasmid, and correction of the CFTR chloride channel was observed in humans following intranasal administration of a rod-like compacted 8.3 kbp plasmid. To further investigate the potential size and shape limitations of DNA nanoparticles for in vivo lung delivery, reporter gene activity of ellipsoidal and rod-like compacted luciferase plasmids ranging in ...Continue Reading

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