Poly-L-glutamate, an anionic polymer, enhances transgene expression for plasmids delivered by intramuscular injection with in vivo electroporation.

Abstract:

:Intramuscular (i.m.) injection of plasmids followed by electropermeabilization is an efficient process to deliver genes into skeletal myofibers that permits proteins to be produced and secreted at therapeutically relevant levels. To further improve skeletal muscle as a bioreactor, we identified a formulation that elevates transgene expression in myofibers after i.m. injection and electroporation. With secreted placental alkaline phosphate (SEAP) as reporter gene, plasmid formulated with poly-L-glutamate produced two- to eight-fold higher levels of SEAP in mouse serum than plasmid in saline. Various concentrations and molecular weights of poly-L-glutamate were similarly effective, but 6 mg/ml of 15-50 kDa poly-L-glutamate consistently yielded the highest expression levels. The poly-L-glutamate formulation was effective in two different muscle groups in mice at various plasmid doses for several transgenes, including an erythropoietin (EPO) gene, for which expression was elevated four- to 12-fold in comparison to animals that received EPO plasmid in saline. Transgene expression was localized to myofibers. Poly-L-glutamate may improve transgene expression in part by increasing plasmid retention in skeletal muscle. Poly-L-glutamate did not enhance gene transfer in the absence of electroporation. Therefore, the polymer is a novel formulation that specifically enhances the transfer and expression of genes delivered with electroporation.

journal_name

Gene Ther

journal_title

Gene therapy

authors

Nicol F,Wong M,MacLaughlin FC,Perrard J,Wilson E,Nordstrom JL,Smith LC

doi

10.1038/sj.gt.3301806

keywords:

subject

Has Abstract

pub_date

2002-10-01 00:00:00

pages

1351-8

issue

20

eissn

0969-7128

issn

1476-5462

journal_volume

9

pub_type

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