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Updated: Mar 17, 2026
Chondrogenic Differentiation Induction of Adipose-derived Stem Cells by Centrifugal Gravity
Published on: February 24, 2017
DEC2 is a negative regulator for the proliferation and differentiation of chondrocyte lineage-committed mesenchymal
Tomoko Sasamoto1, Katsumi Fujimoto2, Masami Kanawa3
1Department of Orthodontic Medicine, Institute of Biomedical and Health Sciences, Hiroshima University, Hiroshima 734-8553, Japan.
Abstract:
Differentiated embryo chondrocyte 2 (DEC2) is a basic helix-loop-helix-Orange transcription factor that regulates cell differentiation in various mammalian tissues. DEC2 has been shown to suppress the differentiation of mesenchymal stem cells (MSCs) into myocytes and adipocytes. In the present study, we examined the role of DEC2 in the chondrogenic differentiation of human MSCs. The overexpression of DEC2 exerted minimal effects on the proliferation of MSCs in monolayer cultures with the growth medium under undifferentiating conditions, whereas it suppressed increases in DNA content, glycosaminoglycan content, and the expression of several chondrocyte-related genes, including aggrecan and type X collagen alpha 1, in MSC pellets in centrifuge tubes under chondrogenic conditions. In the pellets exposed to chondrogenesis induction medium, DEC2 overexpression downregulated the mRNA expression of fibroblast growth factor 18, which is involved in the proliferation and differentiation of chondrocytes, and upregulated the expression of p16INK4, which is a cell cycle inhibitor. These findings suggest that DEC2 is a negative regulator of the proliferation and differentiation of chondrocyte lineage-committed mesenchymal cells.
Insights
Differentiated embryo chondrocyte 2 (DEC2) suppresses chondrogenic differentiation in human mesenchymal stem cells (MSCs). Overexpression of DEC2 inhibits chondrocyte marker gene expression and cell proliferation, indicating its role as a negative regulator.
Area of Science:
- Cell Biology
- Developmental Biology
- Stem Cell Research
Background:
- Differentiated embryo chondrocyte 2 (DEC2) is a transcription factor regulating mammalian tissue differentiation.
- DEC2 is known to inhibit mesenchymal stem cell (MSC) differentiation into myocytes and adipocytes.
Purpose of the Study:
- To investigate the role of DEC2 in the chondrogenic differentiation of human MSCs.
- To determine if DEC2 influences chondrocyte lineage commitment and proliferation.
Main Methods:
- Overexpression of DEC2 in human MSCs cultured under chondrogenic conditions.
- Analysis of DNA content, glycosaminoglycan accumulation, and chondrocyte-related gene expression (e.g., aggrecan, type X collagen alpha 1).
- Assessment of fibroblast growth factor 18 (FGF18) and p16INK4 expression levels.
Main Results:
- DEC2 overexpression minimally affected MSC proliferation in monolayer cultures.
- In pellet cultures, DEC2 overexpression suppressed increases in DNA content, glycosaminoglycan content, and chondrocyte-specific gene expression.
- DEC2 overexpression downregulated FGF18 mRNA and upregulated p16INK4 expression in chondrogenic MSC pellets.
Conclusions:
- DEC2 acts as a negative regulator of chondrogenic differentiation in human MSCs.
- DEC2 influences the proliferation and differentiation of chondrocyte lineage-committed cells.
- DEC2 may play a critical role in controlling chondrogenesis by modulating key signaling pathways and cell cycle inhibitors.
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