Pseudotyped retroviral vector for gene therapy of cancer

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 7/01 (2006.01) A61K 47/48 (2006.01) A61K 48/00 (2006.01) C07K 14/145 (2006.01) C12N 5/10 (2006.01) C12N 7/04 (2006.01) C12N 15/63 (2006.01) C12N 15/85 (2006.01) C12N 15/86 (2006.01) C12N 15/867 (2006.01) C12Q 1/68 (2006.01)

Patent

CA 2371216

The invention relates to retroviral expression vectors and more particularly to pseudotyped retroviral vectors for gene therapy of cancer. Direct <i>in vivo</i> tumor-targeting with "suicide" viral vectors is limited by inefficient gene transfer and indiscriminate transfer of a contitionally toxic gene to surrounding non-malignant tissue. Retrovectors pseudotyped with a Vesicular Stomatitis Virus G protein (VSVG) may serve as a remedy to this conundrum. These retroviral particles differ from standard murine retroviruses by their very broad tropism and the capacity to be concentrated by ultracentrifugation without loss of activity. A VSVG-typed retrovector can be utilized for efficient and tumor specific Herpes Simplex Virus Thymidine Kinase (TK) gene delivery <i>in vivo</i>. A bicistronic retroviral vector which expresses TK and Green Fluorescence Protein (pTKiGFP) was constructed.

L'invention concerne des vecteurs d'expression rétroviraux et notamment des pseudotypes de vecteurs rétroviraux destinés à la thérapie génique du cancer. Le ciblage direct "in vivo" des tumeurs avec des vecteurs viraux "suicidaires" est limité par l'inefficacité du transfert de gènes et par le transfert non discriminé d'un gène conditionnellement toxique vers des tissus environnants non malins. L'utilisation de rétrovirus dont on a obtenu le pseudotype avec une protéine G du virus de la stomatite vésiculaire (VSVG) peut apporter une solution au problème. Ces particules rétrovirales se distinguent, dans le cas des rétrovirus murins standard, par leur tropisme très large et par leur capacité d'être concentrés par ultracentrifugation sans perdre leur activité. On peut utiliser un rétrovecteur dont on a obtenu le pseudotype avec VSVG pour un apport in vivo efficace de la thimidine kinase (TK) du virus herpès simplex. Selon cette invention, on a construit un vecteur rétroviral cistronique qui exprime la TK et la protéine verte fluorescente (pTKiGFP).

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