Journal
BIOMATERIALS
Volume 32, Issue 27, Pages 6478-6486Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biomaterials.2011.05.045
Keywords
ECM (extracellular matrix); Bone marrow; Stem cell; Cell signaling; Osteogenesis; Adipose tissue engineering
Funding
- NIDCR [DE017362, DE06988, DE13045, DE15920]
- NIDDK [DK51563, DK62876]
- University of Southern California
- Royal Commission for the Exhibition of 1851, United Kingdom
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Amelogenin is the most abundant protein of the enamel organic matrix and is a structural protein indispensable for enamel formation. One of the amelogenin splicing isoforms, Leucine-rich Amelogenin Peptide (LRAP) induces osteogenesis in various cell types. Previously, we demonstrated that LRAP activates the canonical Wnt signaling pathway to induce osteogenic differentiation of mouse ES cells through the concerted regulation of Wnt agonists and antagonists. There is a reciprocal relationship between osteogenic and adipogenic differentiation in bone marrow mesenchymal stem cells (BMMSCs). Wnt10b-mediated activation of canonical Wnt signaling has been shown to regulate mesenchymal stem cell fate. Using the bipotential bone marrow stromal cell line ST2, we have demonstrated that LRAP activates the canonical Wnt/beta-catenin signaling pathway. A specific Wnt inhibitor sFRP-1 abolishes the effect of LRAP on the stimulation of osteogenesis and the inhibition of adipogenesis of ST2 cells. LRAP treatment elevates the Wnt10b expression level whereas Wnt10b knockdown by siRNA abrogates the effect of LRAP. We show here that LRAP promotes osteogenesis of mesenchymal stem cells at the expense of adipogenesis through upregulating Wnt10b expression to activate Wnt signaling. (C) 2011 Elsevier Ltd. All rights reserved.
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