Regulation of hematopoietic stem cell differentiation by the...

C - Chemistry – Metallurgy – 12 – N

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C12N 5/077 (2010.01) C12N 5/0789 (2010.01) A61K 35/12 (2006.01) A61K 35/32 (2006.01) A61K 48/00 (2006.01) C12N 5/10 (2006.01)

Patent

CA 2330190

The invention relates to the induction of hematopoietic stem cells to differentiate into osteoclasts by culturing hematopoietic stem cells with human mesenchymal stem cells, and, in a preferred embodiment, using no exogenous cytokines. Differentiation of the mesenchymal stem cells into osteoblasts inhibited the differentiation of hematopoietic stem cells into osteoclasts. In addition, hematopoietic stem cells can be genetically engineered to carry genes of interest particularly for the expression of physiologically active proteins. In the presence of mesenchymal stem cells, the transduced cells carry the new genetic material and express gene products that can be used to modulate bone resorption.

La présente invention concerne l'induction de cellules souches hématopoïétiques pour différencier des ostéoclastes par la mise en culture de cellules souches hématopoïétiques avec des cellules souches mésenchymateuses humaines et, dans une forme de réalisation préférée, sans recours à des cytokines exogènes. La différenciation des cellules souches mésenchymateuses en ostéoblastes a inhibé la différenciation de cellules souches hématopoïétiques en ostéoclastes. En outre, les cellules souches hématopoïétiques peuvent être transformées génétiquement pour porter des gènes d'intérêt, notamment pour l'expression de protéines physiologiquement actives. En présence de cellules souches mésenchymateuses, les cellules tranduites portent le nouveau matériel génétique et expriment des produits géniques pouvant être utilisés pour moduler la résorption osseuse.

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