Regulation of Tenomodulin Expression Via Wnt/β-catenin Signaling in Equine Bone Marrow-derived Mesenchymal Stem Cells.
Abstract: Tenomodulin has been recognized as a biomarker for tendon differentiation, and its gene expression is regulated by several transcription factors including Scleraxis and Mohawk. In this study, we found a novel regulatory mechanism of tenomodulin expression. Equine bone marrow-derived mesenchymal stem cells (BMSCs) in monolayer culture showed a low mRNA level of tenomodulin in comparison with the level in the tendon. When cultured in collagen gel containing a glycogen synthase kinase-3 (GSK-3) inhibitor (BIO), expression of tenomodulin in BMSCs increased up to the level in the tendon. Participation of GSK-3 in its gene expression was further demonstrated by a gene silencing experiment with small interference RNA corresponding to GSK-3, suggesting that Wnt/β-catenin signaling mediated expression of tenomodulin. These results were confirmed by nuclear translocation of β-catenin in BIO-treated BMSCs cultured in collagen gel. Under this culture condition, expression of tenomodulin-related transcription factors including Scleraxis and Mohawk was not affected, suggesting that Wnt/β-catenin signaling was independent from these transcription factors. Additionally, BIO strongly enhanced expression of type XIV collagen in collagen-embedded BMSCs up to the level in the tendon, and other tendon-related extracellular matrix components such as decorin and fibromodulin were also upregulated. Taken together, these results indicated that activation of Wnt/β-catenin signaling could induce differentiation of BMSCs into tenomodulin-expressing tendon cells in collagen gel.
Publication Date: 2014-04-22 PubMed ID: 24834008PubMed Central: PMC4019198DOI: 10.1294/jes.25.7Google Scholar: Lookup
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Summary
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The research article explores how the Wnt/β-catenin signaling pathway regulates the expression of tenomodulin, a biomarker for tendon differentiation, in equine bone marrow-derived mesenchymal stem cells (BMSCs). The findings propose a new mechanism by which BMSCs could be differentiated into tenomodulin-expressing cells.
Background and Aims
- The authors of the study aimed to understand the mechanisms controlling the expression of tenomodulin, a well-known biomarker that indicates the differentiation of cells into tendon tissue.
- The primary concern of the researchers was to verify whether the Wnt/β-catenin signaling pathway was involved in the regulation of tenomodulin in equine bone marrow-derived mesenchymal stem cells.
Methodology
- BMSCs were cultured in a collagen gel containing a glycogen synthase kinase-3 (GSK-3) inhibitor (BIO). Subsequent examination showed increased tenomodulin expression.
- Experiments using small interfering RNA to silence GSK-3 gene activity demonstrated the connection between GSK-3 and tenomodulin expression.
- Confirmation of this mechanism was made through the observation of β-catenin nuclear translocation in the treated BMSCs, indicating engagement of the Wnt/β-catenin pathway.
- Following the experiments, the relationship between Wnt/β-catenin signaling and other known tenomodulin-regulating transcription factors, such as Scleraxis and Mohawk, was examined. However, these factors did not seem to have an impact subsequent to the activation of Wnt/β-catenin signaling.
Findings
- BIO treatment stimulated a significant increase in the expression of tenomodulin in the treated BMSCs to a level typical within tendons. This includes the overexpression of other tendon-associated extracellular matrix components like type XIV collagen, decorin, and fibromodulin.
- The study evidenced Wnt/β-catenin signaling as a critical component in the regulation of tenomodulin expression, independent of other transcription factors usually associated with tenomodulin regulation.
- In conclusion, activating the Wnt/β-catenin pathway can potentially guide the differentiation of stem cells into tenomodulin-expressing tendon cells.
Cite This Article
APA
Miyabara S, Yuda Y, Kasashima Y, Kuwano A, Arai K.
(2014).
Regulation of Tenomodulin Expression Via Wnt/β-catenin Signaling in Equine Bone Marrow-derived Mesenchymal Stem Cells.
J Equine Sci, 25(1), 7-13.
https://doi.org/10.1294/jes.25.7 Publication
Researcher Affiliations
- Department of Tissue Physiology, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan.
- Department of Tissue Physiology, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan.
- Laboratory of Clinical Science and Pathobiology, Equine Research Institute, Japan Racing Association, Tochigi 320-8056, Japan.
- Laboratory of Clinical Science and Pathobiology, Equine Research Institute, Japan Racing Association, Tochigi 320-8056, Japan.
- Department of Tissue Physiology, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan.
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