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Published on: October 4, 2024
BMP7 reduces the fibrocartilage chondrocyte phenotype
Ellen G J Ripmeester1, Marjolein M J Caron2, Guus G H van den Akker1
1Laboratory for Experimental Orthopedics, Department of Orthopedic Surgery, Maastricht University, Universiteitssingel 50, 6229 ER, Maastricht, The Netherlands.
Bone Morphogenetic Protein 7 (BMP7) reduces the fibrocartilage chondrocyte phenotype in osteoarthritis by decreasing collagen type I and inhibiting fibrosis pathways. BMP7 may offer a dual therapeutic approach for osteoarthritis by targeting both hypertrophic and fibrotic chondrocyte phenotypes.
Area of Science:
- Biochemistry
- Cell Biology
- Osteoarthritis Research
Background:
- The fibrocartilage chondrocyte phenotype is linked to osteoarthritis (OA) development and progression.
- Bone Morphogenetic Protein 7 (BMP7) is investigated for its potential to modify OA and reduce chondrocyte hypertrophy.
- BMP7's anti-fibrotic effects in organ fibrosis are known, but its role in chondrocytes remains unclear.
Purpose of the Study:
- To investigate the anti-fibrotic properties of BMP7 in human OA articular chondrocytes (HACs) and SW1353 cells.
- To determine if BMP7 can decrease the fibrocartilage chondrocyte phenotype and its underlying molecular mechanisms.
Main Methods:
- Human OA articular chondrocytes (HACs) and SW1353 cells were treated with BMP7.
- Gene expression of fibrosis-related markers (e.g., Collagen type I, PAI1, MMP2) was analyzed using RT-qPCR.
- Protein levels, activity assays (MMP2, SMAD3), western blotting, and reporter assays were employed to assess molecular changes.
Main Results:
- BMP7 treatment reduced fibrosis-related gene expression in both SW1353 cells and OA HACs.
- BMP7 decreased Collagen type I protein levels, an effect dependent on MMP2 activity.
- BMP7 inhibited the TGFβ-Smad3-PAI1 axis and reduced SMAD3 transcriptional activity.
Conclusions:
- Short-term BMP7 exposure decreases the fibrocartilage chondrocyte phenotype.
- BMP7 exhibits anti-fibrotic actions in chondrocytes, potentially via MMP2-dependent Collagen type I turnover and Smad2/3-PAI1 pathway inhibition.
- BMP7 demonstrates a dual mode-of-action, targeting both hypertrophic and fibrotic chondrocyte phenotypes, suggesting its clinical relevance for osteoarthritis.
