Efficient transfer of genes into murine cardiac grafts by Starburst polyamidoamine dendrimers

Human Gene Therapy
L QinJ S Bromberg

Abstract

Starburst dendrimer, a structurally defined, spherical macromolecule composed of repeating polyamidoamino subunits, was investigated to augment plasmid-mediated gene transfer efficiency in a murine cardiac transplantation model. The grafts were directly injected with naked pCH110, a plasmid encoding beta-galactosidase (beta-Gal), or pCH110-dendrimer complex, and reporter gene expression determined by X-Gal staining. The grafts injected with pCH110-dendrimer demonstrated widespread and extended beta-Gal expression in both myocytes and the graft infiltrating cells from 7 to 28 days, compared to the grafts injected with naked pCH110 that expressed beta-Gal only in myocytes for less than 14 days. p alphaMHC-vIL-10, as plasmid encoding viral interleukin-10 (vIL-10) under the control of alpha-myosin heavy chain promoter, was able to prolong allograft survival from 13.9 +/- 0.9 days to 21.4 +/- 2.3 days (p < 0.005). When dendrimer G5EDA was used with p alphaMHC-vIL-10, 60-fold less DNA resulted in significant prolongation of graft survival to 38.6 +/- 4.7 days (p < 0.0005). The dose of DNA, the charge ratio of DNA to dendrimer, and the size generation of the dendrimers were all determined to be critical variables for prolongation of a...Continue Reading

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