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Life Sci. 2008 Dec 19;83(25-26):851-8. doi: 10.1016/j.lfs.2008.09.030. Epub 2008 Oct 22.

ICAT participates in proliferation and osteogenic differentiation of human adipose tissue-derived mesenchymal stem cell.

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  • 1Department of Physiology, School of Medicine, Pusan National University, Pusan, Republic of Korea.



The Wnt/beta-catenin pathway plays a critical part in several cell physiology events associated with embryonic development and adult homeostasis, including determination, proliferation, migration, and differentiation. However, the role of Wnt signaling in osteoblastogenesis from mesenchymal stem cells (MSC) remains a controversial matter. Therefore, in the present study, we investigated how ICAT (inhibitor of beta-catenin and TCF-4), a negative regulator of the Wnt signaling pathway, influenced differentiation and proliferation of human adipose tissue-derived stromal cells (hASC).


To mediate ICAT overexpression in hASC, we used a lentiviral gene transfer technique. We further determined the role of ICAT by RNAi technique.


ICAT-transduced hASC exhibited lower TCF promoter activity and cellular growth capacity than control cells, but ICAT overexpression did not affect hASC attachment efficiency. ICAT overexpression also increased osteogenic differentiation. Conversely, introduction of an ICAT siRNA oligonucleotide increased TCF promoter activity and cellular proliferation, but it inhibited osteogenic differentiation.


Taken together, these findings indicated that ICAT participated in regulating hASC proliferation and differentiation by modulating Wnt signaling.

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