Differentiation of adipose stromal cells into osteoblasts...

C - Chemistry – Metallurgy – 12 – N

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C12N 5/077 (2010.01) A61K 35/12 (2006.01) A61K 35/32 (2006.01) C12Q 1/02 (2006.01)

Patent

CA 2312847

The invention provides methods and compositions for differentiating stromal cells from adipose tissue into cells having osteoblastic properties, and methods for improving a subject's bone structure. The methods comprise culturing stromal cells from adipose tissue in .beta.-glycerophosphate and ascorbic acid and/or ascorbate-2-phosphate for a time sufficient to allow differentiation of said cells into osteoblasts. Such methods and compositions are useful in the production of osteoblasts for autologous transplantation into bone at a surgical site or injury. The compositions comprise adipose stromal cells, a medium capable of supporting the growth of fibroblasts and amounts of .beta.-glycerophosphate and ascorbic acid and/or ascorbic-2- phosphate sufficient to induce the differentiation of said stromal cells into osteoblasts. The invention further provides methods of identifying compounds that effect osteoblasts differentiation. Such compounds are useful in the study of bone development and in the treatment of bone disorders, including bone fractures and osteoporosis.

L'invention concerne des méthodes et des compositions permettant de différencier des cellules du stroma provenant de tissus adipeux en cellules présentant des propriétés ostéoblastiques, ainsi que des méthodes permettant d'améliorer la structure osseuse d'un sujet. Ces méthodes consistent à cultiver des cellules du stroma provenant de tissus adipeux dans du glycérophosphate .beta. et de l'acide ascorbique et/ou de l'ascorbate-2-phosphate pendant une durée suffisant à la différentiation desdites cellules en ostéoblastes. Ces méthodes et ces compositions sont utiles pour la production d'ostéoblastes destinés à une greffe osseuse autologue dans un champ opératoire ou une lésion. Ces compositions comprennent des cellules du stroma adipeuses, un milieu capable de supporter la croissance de fibroblastes, et des quantités de glycérophosphate .beta., d'acide ascorbique et/ou d'ascorbate-2-phosphate suffisant à induire la différentiation desdites cellules du stroma en ostéoblastes. Cette invention concerne également des méthodes d'identification de composés ayant un effet sur la différentiation en ostéoblastes. Ces composés sont utiles dans l'étude du développement osseux et dans le traitement de troubles osseux, notamment de fractures de l'os et de l'ostéoporose.

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