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Updated: Jun 10, 2026
Chondrogenic Pellet Formation from Cord Blood-derived Induced Pluripotent Stem Cells
Published on: June 19, 2017
FGF-2 abolishes the chondrogenic effect of combined BMP-6 and TGF-beta in human adipose derived stem cells
Florian Hildner1, Anja Peterbauer, Susanne Wolbank
1Ludwig Boltzmann Institute for Experimental and Clinical Traumatology, AUVA Research Center, Linz/Vienna, Austria.
Abstract:
In this study, we investigated the influence of transforming growth factor beta 3 (TGF-beta3), bone morphogenetic protein 6 (BMP-6) and basic fibroblast growth factor (FGF-2) on chondrogenesis in adipose derived stem cells (ASC). Cells were isolated from liposuction material, expanded and subjected to chondrogenic differentiation. Micromass pellets were cultured in chondrogenic medium containing 10 ng/mL TGF-beta3 which was additionally supplemented with 10 ng/mL BMP-6, 10 ng/mL FGF-2 or a combination of both. We quantitatively evaluated the cartilage specific gene expression after 14 days of culture. The end point measurements on day 35 included glycosaminoglycan (GAG) quantification, histological staining for chondrogenic markers, and transmission electron microscopy (TEM). In comparison to cultures induced with TGF-beta3/FGF-2, the presence of TGF-beta3/BMP-6 demonstrated strong induction of collagen type II, collagen type IX and aggrecan mRNA expression. This was corroborated by quantification and histological staining for GAGs and immunohistological staining for collagen II. However, when a combination of BMP-6 and FGF-2 in addition to TGF-beta3 was added, FGF-2 counteracted BMP-6, as indicated by reduced marker gene expression and weak to absent staining for GAGs. In conclusion, this study demonstrates that BMP-6 combined with TGF-beta3 is a potent inducer of chondrogenesis in human ASC. In contrast, FGF-2 does not contribute to differentiation, but rather suppresses the chondrogenic potential of BMP-6.
Insights
Bone morphogenetic protein 6 (BMP-6) combined with transforming growth factor beta 3 (TGF-beta3) effectively induces chondrogenesis in adipose-derived stem cells (ASCs). Basic fibroblast growth factor (FGF-2) suppresses this differentiation process.
Area of Science:
- Stem cell biology
- Tissue engineering
- Regenerative medicine
Background:
- Adipose-derived stem cells (ASCs) are multipotent cells with potential for cartilage regeneration.
- Chondrogenesis, the process of cartilage formation, is crucial for repairing cartilage defects.
- Growth factors play a key role in directing stem cell differentiation.
Purpose of the Study:
- To investigate the effects of TGF-beta3, BMP-6, and FGF-2 on chondrogenesis in ASCs.
- To determine the optimal combination of growth factors for inducing cartilage formation.
- To evaluate the suppressive role of FGF-2 in BMP-6-mediated chondrogenesis.
Main Methods:
- ASCs were isolated from liposuction material and cultured.
- Micromass pellets were induced with TGF-beta3, BMP-6, FGF-2, or combinations thereof.
- Gene expression of cartilage-specific markers (collagen II, IX, aggrecan) was quantified.
- Glycosaminoglycan (GAG) content, histological staining, and TEM were performed.
Main Results:
- TGF-beta3/BMP-6 significantly upregulated cartilage-specific gene expression compared to TGF-beta3/FGF-2.
- GAG quantification and histological staining confirmed enhanced chondrogenesis with TGF-beta3/BMP-6.
- FGF-2 addition to TGF-beta3/BMP-6 suppressed chondrogenic marker expression and GAG deposition.
Conclusions:
- BMP-6 in combination with TGF-beta3 is a potent inducer of chondrogenesis in human ASCs.
- FGF-2 does not enhance, but rather inhibits, the chondrogenic potential induced by BMP-6.
- These findings provide insights into optimizing growth factor combinations for cartilage tissue engineering.
