Formulation of microparticle carrier for oral polyplex-based DNA vaccines

Howard, K.A., Li, X., Somavarapu, S., Singh, J., Green, N., Atuah, K.N., Ozsoy, Y., Seymour, L.W. and Alpar, H.O. (2004) Formulation of microparticle carrier for oral polyplex-based DNA vaccines. Biochimica et Biophysica Acta, 1674 (2). pp. 149-157. 10.1016/j.bbagen.2004.06.009.

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DOI: 10.1016/j.bbagen.2004.06.009


Oral induction of a disseminated mucosal immune response with polyplex-based DNA vaccines requires the delivery of intact polyplexes (polyelectrolyte complexes formed by self-assembly of plasmid DNA with a cationic polymer) to subepithelial lymphoid tissue (e.g. Peyer's patches) within the gastrointestinal tract. This work describes the formulation of a microparticle polyplex carrier allowing the potential of this approach to be realised. PEGylated PEI/DNA polyplexes (DNA concentration 20 μg/ml) formed at N/P 5:0 (defined as the ratio of polycation amino groups to DNA phosphates) were stable to salt-induced aggregation and could be concentrated to a final DNA concentration of 1 mg/ml without polyplex size increase. Polyplexes containing 1:1 polyethylene glycol (PEG)/polyethylenimine (PEI) ratio (mass/mass) gave similar levels of luciferase gene expression in B16F10 cells compared to non-PEG complexes. Poly-(d,l-lactide-co-glycolide) (PLGA) microparticles containing PEGylated polyplexes (≈17% DNA encapsulation efficiency) were formulated using a modified double emulsion solvent evaporation method. The microencapsulation and release of intact polyplexes from the microparticle carrier was demonstrated using polyanion (heparin sulfate and poly(aspartic acid) (PAA)) displacement techniques and electron microscopy. Microparticles containing PEGylated polyplexes (24 μg β-galactosidase DNA) were given orally to Wistar rats. Significant transgene expression (compared to background) was found in peripheral tissue (spleen) 72 h after administration. This work demonstrates the potential application of microparticle carriers for mucosal polyplex-based vaccination.

Item Type:Article
Uncontrolled Keywords:Polyplex; DNA; Gene delivery; Polyethylenimine; Microparticle; PLGA; Oral
Departments, units and centres:Department of Pharmaceutics > Centre for Drug Delivery Research
ID Code:222
Journal or Publication Title:Biochimica et Biophysica Acta
Deposited By:Library Staff
Deposited On:11 Oct 2006
Last Modified:18 Nov 2011 09:45

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