Igf-1 instructs multipotent adult cns neural stem cells to...

C - Chemistry – Metallurgy – 12 – N

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C12N 5/079 (2010.01) C12N 5/0797 (2010.01) A61K 35/30 (2006.01) A61K 38/18 (2006.01) A61K 48/00 (2006.01) A61P 25/00 (2006.01) C12Q 1/02 (2006.01)

Patent

CA 2539947

Adult neural stem cells differentiate into neurons, astrocytes, and oligodendrocytes in the mammalian CNS, but the molecular mechanisms that control their differentiation are not yet well understood. Insulin-like growth factor-I (IGF-I) can promote the differentiation of cells already committed to an oligodendroglial lineage during development. However, it is unclear whether IGF-I affects multipotent neural stem cells. Here we show that IGF-I stimulates the differentiation of multipotent adult rat hippocampus-derived neural progenitor cells into oligodendrocytes. Modeling analysis indicates that the actions of IGF-I are instructive. Oligodendrocyte differentiation by IGF-I appears to be mediated through an inhibition of BMP signaling. Furthermore, overexpression of IGF-I in the hippocampus leads to an increase in oligodendrocyte markers. These data demonstrate the existence of a single molecule, IGF-I, that can influence the fate choice of multipotent adult neural progenitor cells to an oligodendroglial lineage.

Des cellules souches nerveuses adultes se différencient en neurones, astrocytes et oligodendrocytes dans le système nerveux central des mammifères, mais les mécanismes moléculaires qui commandent leur différenciation ne sont pas encore bien compris. Le facteur de croissance de type insuline I (IGF-I) peut favoriser la différenciation de cellules déjà dédiées à une lignée oligodendrogliale lors du développement. Cependant, on ne sait pas si IGF-I affecte des cellules souches nerveuses pluripotentes. Dans cette invention, il est démontré que IGF-I stimule la différenciation de cellules précurseurs nerveuses de rat adultes pluripotentes dérivées de l'hippocampe en oligodendrocytes. Une analyse de modélisation montre que les actions de IGF-I sont instructives. La différenciation en oligodendrocytes par IGF-I semble être impliquée par l'inhibition d'une signalisation BMP. De plus, une surexpression d'IGF-I chez l'hippocampe conduit à une augmentation de marqueurs d'oligodendrocytes. Ces données prouvent l'existence d'une seule molécule, IGF-I, qui peut influencer le choix du devenir de cellules précurseurs nerveuses adultes pluripotentes en une lignée oligodendrogliale.

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