Gene therapy using tgf-.beta.

A - Human Necessities – 61 – K

Patent

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Details

A61K 48/00 (2006.01) A61K 38/18 (2006.01) C07K 14/495 (2006.01) C12N 15/09 (2006.01) C12N 15/63 (2006.01) A61K 35/12 (2006.01)

Patent

CA 2373045

The subject invention is related to a cell-mediated gene therapy treatment for orthopedic disease using a member belonging to the transforming growth factor- .beta. (TGF-.beta.) superfamily. TGF-.beta. gene therapy as a new treatment method for degenerative arthritis is demonstrated. After transfection of TGF- .beta. cDNA expression vectors into fibroblasts (NIH 3T3-TGF-.beta.1), the cells were injected into rabbit achilles tendon and knee joints with artificially-made cartilage defects. Intratendinous injections were performed to determine the optimal concentration for in vivo expression. Partially defected cartilage model was made to simulate degenerative arthritis of the knee joint. The partial cartilage defect treated with the cell-mediated gene therapy procedure was covered by newly formed hyaline cartilage which indicates that the cells survived and stimulated matrix formation in this area. Completely denuded cartilage areas were covered by fibrous collagen.

L'invention concerne une thérapie génique à médiation cellulaire de maladies orthopédiques, dans laquelle intervient un élément de la superfamille du facteur .beta. de transformation cellulaire (TGF-.beta.). L'invention concerne notamment la thérapie génique reposant sur l'utilisation du TGF-.beta. comme nouvelle méthode de traitement de l'arthrite dégénérative. Suite à la transfection de vecteurs d'expression d'ADNc codant pour TGF-.beta. dans des fibroblastes (NIH 3T3-TGF-.beta.1), les cellules sont injectées dans le tendon d'Achille et les articulations du genou de lapins présentant des défauts cartilagineux artificiels. Les injections intratendineuses sont effectuées afin de déterminer la concentration optimale pour l'expression in vivo. Un modèle de cartilage partiellement défectueux est fabriqué pour simuler l'arthrite dégénérative de l'articulation du genou. Le défaut cartilagineux partiel, traité au moyen de la procédure de thérapie génique à médiation cellulaire, se recouvre d'un cartilage hyalin nouvellement constitué, ce qui montre que les cellules ont survécu et ont stimulé la formation d'une matrice dans cette partie. Les parties cartilagineuses totalement dénudées se sont recouvertes de collagène fibreux.

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