Increased delivery of a nucleic acid construct in vivo by...

A - Human Necessities – 61 – K

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A61K 48/00 (2006.01) C07K 14/60 (2006.01) C12N 15/63 (2006.01)

Patent

CA 2485976

Plasmid DNA delivered by injection / electroporation to the skeletal muscle can be expressed, and physiologic levels of transgene could be achieved into the circulation. Nevertheless, stabilization of naked DNA may be required and necessary in some cases, as prolonged storage at different temperatures before usage, injection into a large number of animals, etc. It is imperative that the associated compound should not be toxic to the cells (e.g. muscle cells) or cause breakage of plasmid DNA. It would be preferable for the coated DNA to have a similar or increased uptake into the target cells. Low molecular weight poly~L-glutamate compounds have all the desired properties. It was determined that mole/mole ratio DNA/PLG is the optimum concentration for gene therapeutic applications to the skeletal muscle, resulting in increased expression of the transgene, with no damage to the target tissue. Furthermore, stabilization of plasmid DNA by PLG has never been observed or described in the literature.

L'ADN plasmidique délivré par injection/électroporation à un muscle squelettique peut être exprimé, et les niveaux physiologiques de transgène pourraient être accomplis dans la circulation. La stabilisation d'ADN nu peut être exigée et nécessaire, dans certains cas, comme le stockage prolongé à différentes températures avant usage, l'injection dans un grand nombre d'animaux etc. Il est impératif que le composé associé ne devrait pas être toxique aux cellules (notamment les cellules musculaires) ou provoquer une cassure de l'ADN plasmidique. Il serait préférable pour l'ADN enrobé d'avoir une assimilation similaire ou meilleure dans les cellules cibles. Les composés de poly-L-glutamate de faible poids moléculaire ont les propriétés souhaitées. Il est déterminé que le rapport ADN/PLG mole/mole est la concentration optimale des applications de thérapie génique au muscle skelettique, résultant en l'expression améliorée du transgène, avec aucun dommage au tissu cible. Enfin la stabilisation de l'ADN plasmidique par le PLG n'a jamais été observée ni décrite dans la littérature.

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