Genetically modified t-cells, method for producing them and...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 5/00 (2006.01) A61K 39/00 (2006.01) A61K 35/12 (2006.01) A61K 48/00 (2006.01) C12N 5/06 (2006.01)

Patent

CA 2381459

The invention relates to in-vitro genetically modified T-cells for preventing allogenic transplant rejection in vivo, to methods for producing them and to their use. T-cells of the transplant recipient are stimulated in vitro with cells of the transplant donor or with cells which express dominant MHC molecules and at the same time, transduced with immunomodulating genes by means of gene transfer. After the gene transfer, the transduced T-cells begin to express the immunomodulatory genes. The gene transfer can be carried out using retro viruses, other viral vector systems or liposomes. The conditions selected for the experiment, which result in the generation and expansion of allo-specific T-cells, ensure that the T-cells migrate into the allogenic transplant and into the draining lymph nodes specifically according to the in vivo application and can express the immunomodulating genes there. The invention provides an effective means of preventing the rejection of allogenic transplants (cells, tissues, organs) and is therefore an effective means of inducing and maintaining tolerance of allogenic transplants (cells, tissues, organs) in transplant medicine.

L'invention concerne des lymphocytes T génétiquement modifiés in vitro et permettant d'empêcher le rejet d'un transplant allogène in vivo ainsi que son procédé de production et son utilisation. Les lymphocytes T du receveur du transplant in vitro sont stimulés par des cellules du donneur du transplant ou par des cellules qui expriment des molécules dominantes du CMH, et sont simultanément transduits par transfert génique par des gènes immunomodulateurs. Après le transfert génique, les lymphocytes transduits commencent à exprimer les gènes immunomodulatoires. Le transfert génique peut s'effectuer à l'aide de rétrovirus, d'autres systèmes vecteurs viraux ou des liposomes. Sur la base des conditions d'essai choisies qui entraînent la génération et l'expansion de lymphocytes T allo-spécifiques, les lymphocytes T pénètrent, après l'application in vivo, spécifiquement tant dans le transplant allogène que dans les noeuds lymphatiques drainants, où ils peuvent exprimer les gènes immunmodulateurs. L'invention permet d'empêcher efficacement le rejet de transplants allogènes (cellules, tissus, organes) en proposant un produit efficace tant pour induire que pour conserver la tolérance vis-à-vis des transplants allogènes (cellules, tissus, organes) dans la médecine de la transplantation.

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