Hyde, S. C., Pringle, I. A., Abdullah, S., Lawton, A. E., Davies, L. A., Varathalingam, A., Nunez-Alonso, G., Green, A. M., Bazzani, R. P., Sumner-Jones, S. G., Chan, M., Li, H., Yew, N. S., Cheng, S. H., Boyd, A. C., Davies, J. C., Griesenbach, U., Porteous, D. J., Sheppard, D. N., Munkonge, F. M., Alton, E. W. & Gill, D. R.
Nat Biotechnol, 26, 549-551Pubmed Back Citations of this article on Google Scholar
Pulmonary delivery of plasmid DNA (pDNA)/cationic liposome complexes is associated with an acute unmethylated CG dinucleotide (CpG)-mediated inflammatory response and brief duration of transgene expression. We demonstrate that retention of even a single CpG in pDNA is sufficient to elicit an inflammatory response, whereas CpG-free pDNA vectors do not. Using a CpG-free pDNA expression vector, we achieved sustained (>or=56 d) in vivo transgene expression in the absence of lung inflammation.