High-titer retroviral packaging cells

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 5/10 (2006.01) A61K 35/76 (2006.01) A61K 39/21 (2006.01) A61K 48/00 (2006.01) C12N 5/02 (2006.01) C12N 7/04 (2006.01) C12N 15/867 (2006.01) C12N 15/90 (2006.01)

Patent

CA 2650270

The present invention relates to non-replicative recombinant retrovirus packaging cells able to grow in suspension in a serum-free medium. In particular, the present invention relates to a human embryonic 293SF-based cell line stably expressing gag and pol gene products from the murine Moloney leukemia virus (MLV) and either the feline RD114 env gene, the gibbon ape leukemia virus (GLV) env gene, or the amphotropic 4070Aenv gene. This particular combination allows the production of high titer of non-replicative retrovirus pseudotyped and prevents the recombination of plasmids. The recombinant retroviruses produced from these cells are safer and easier to produce for clinical use in gene therapy.

La présente invention concerne des cellules de conditionnement de rétrovirus recombinants non réplicatifs, capables de se développer en suspension dans un milieu exempt de sérum. En particulier, la présente invention porte sur une lignée de cellules à base de 293 SF embryonnaires humaines exprimant de façon stable les produits géniques gag et pol à partir du virus de la leucémie de Moloney murine (MLV) et l'une ou l'autre du gène env RD114 félin, du gène env du virus de la leucémie du singe gibbon (GLV) ou du gène env 4070A amphotropique. Cette combinaison particulière permet la production de rétrovirus à fort titre non réplicatif pseudo-typé et empêche la recombinaison de plasmides. Les rétrovirus recombinants produits par ces cellules sont plus sûrs et plus faciles à produire pour une utilisation unique en thérapie génique.

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