Live vaccine for the treatment of tumour diseases

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/85 (2006.01) A61K 35/12 (2006.01) A61K 39/00 (2006.01) C07K 14/54 (2006.01) C07K 14/705 (2006.01) A61K 48/00 (2006.01)

Patent

CA 2198234

The invention concerns the preparation and use of a live tumour-cell vaccine which contains three additional genes prepared by genetic-engineering techniques: a) a gene coding for a cell-surface protein with immunostimulatory activity, b) a cytokin gene and c) the thymidine kinase gene. The fields of application of the invention are medicine and genetic engineering. The live vaccine proposed owes its effect to the fact that a synergistic anti-tumour response is induced by the multiple transfer of genes which code for immunostimulatory activity. This leads to reliable repulsion of the vaccine cells and enables cells capable of multiplying to be injected as a vaccine. As an additional safety marker, the vaccine cells are given the thymidine kinase gene which enables the vaccine cells to be selectively killed in vivo. The combinatory expression of genes with immunostimulatory activity improves the vaccine effect in comparison with prior art tumour-cell vaccines, and a live tumour-cell vaccine is more effective than a vaccine consisting of cells which are incapable of multiplying. The vaccine is intended for use in the genetic therapy of cancer patients.

L'invention concerne la préparation et l'utilisation d'un vaccin à cellules tumorales vivantes, qui contient trois gènes supplémentaires produits par génie génétique: a) un gène codant une protéine située à la surface de cellules et ayant une activité immunostimulatrice, b) un gène cytokine et c) le gène de la thymidine kinase. Ce vaccin s'utilise en médecine et en génie génétique. L'invention concerne un vaccin à cellules vivantes dont l'efficacité est due au fait que le transfert génique multiple de gènes codant l'activité immunostimulatrice induit une réponse antitumorale. Il en résulte une répulsion des cellules du vaccin, ce qui permet d'injecter les cellules aptes à proliférer, sous forme de vaccin. Les cellules du vaccin contiennent, pour autre marqueur de sécurité, le gène de la thymidine kinase qui permet de tuer de manière sélective in vivo les cellules du vaccin. Comparativement aux vaccins à cellules tumorales connus, l'expression combinatoire de gènes à activité immunostimulatoire renforce l'effet du vaccin, et un vaccin à cellules tumorales vivantes est plus efficace qu'un vaccin constitué de cellules inaptes à proliférer. Ce vaccin doit pouvoir être utilisé en thérapie génique de patients souffrant de tumeurs.

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