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Involvement of PTP-RQ in differentiation during adipogenesis of human mesenchymal stem cells.

Biochem. Biophys. Res. Commun.2009 May 29;383(2):252-7. Epub 2009 Apr 05
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摘要


Mesenchymal stem cells (MSCs) are self-renewable multipotent progenitor cells with the capacity to differentiate into several distinct mesenchymal lineages. While MSCs display significant potential in tissue engineering and therapeutic applications, the regulatory mechanisms underlying the differentiation of these cells are yet to be established. Phosphorylation is a post-translational modification that plays a significant role in diverse biological phenomena. In this study, to mine the protein tyrosine phosphatases (PTPs) involved in adipogenesis of human MSCs, differential expression of human PTPs was examined using RT-PCR analysis. Among the 107 human PTPs, was dramatically downregulated during the early phase of adipogenesis. PTP-duanyu1745 is classified as a receptor-type III PTP with phosphatidylinositol phosphatase (PIPase) activity. Overexpression of PTP-duanyu1745 consistently led to reduced differentiation of MSCs into adipocytes via decreasing the phosphatidyl inositol phosphate level in cells, and consequently downregulating Akt/PKB phosphorylation. Our results collectively suggest that PTP-duanyu1745 is a useful target protein for regulating the differentiation of MSCs into adipocytes, and may be used to develop novel drugs for the treatment of obesity.

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