Stem cell expansion factor blocking a gene limiting...

C - Chemistry – Metallurgy – 12 – N

Patent

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Details

C12N 15/11 (2006.01) A61K 31/7088 (2006.01) A61K 38/17 (2006.01) C07K 14/47 (2006.01) A61K 35/12 (2006.01) C12N 5/06 (2006.01)

Patent

CA 2501630

The present invention relates to a stem cell expansion factor comprising a blocker which reduces expression level of at least one gene normally limiting HOX-induced expansion of stem cells, whereby reducing expression level of said gene enhances expansion of stem cells containing a HOX peptide. The present invention also relates to a composition for enhancing expansion of stem cells comprising an amino acid sequence having the activity of a HOX peptide, wherein said peptide being able to cross a cell membrane, and a blocker which reduces expression level of at least one gene normally limiting HOX-induced expansion of stem cells, whereby reducing expression level of said gene in the presence of a HOX peptide enhances expansion of stem cells. The preferred HOX peptide is HOXB4 and the preferred gene is PBX.

L'invention concerne un facteur d'expansion de cellule souche comprenant un bloqueur qui diminue le niveau d'expression d'au moins un gène limitant normalement l'expansion induite par HOX des cellules souches, la réduction du niveau d'expression dudit gène augmentant l'expansion de cellules souches contenant un peptide HOX. La présente invention porte également sur une composition qui renforce l'expansion de cellules souches contenant une séquence d'acide aminé développant l'activité d'un peptide HOX, ce peptide pouvant traverser une membrane cellulaire, ainsi que sur un bloqueur qui réduit le niveau d'expression d'au moins un gène limitant normalement l'expansion induite par HOX de cellules souches, la réduction du niveau d'expression dudit gène en présence d'un peptide HOX augmentant l'expansion de cellules souches. Selon l'invention, le peptide HOX préféré est HOXB4 et le gène préféré est PBX.

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