Mechanoinduction of PTHrP/cAMP-signaling governs proteoglycan production in mesenchymal stromal cell-derived neocartilage
Abnormal mechanical loading is one of the major risk factors for articular cartilage degeneration. Engineered mesenchymal stromal cell (MSC)-derived cartilage holds great promise for cell-based cartilage repair. However, physiological loading protocols were shown to reduce matrix synthesis of MSC-de...
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| Main Authors: | , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
December 2024
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| In: |
Journal of cellular physiology
Year: 2024, Volume: 239, Issue: 12, Pages: 1-11 |
| ISSN: | 1097-4652 |
| DOI: | 10.1002/jcp.31430 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1002/jcp.31430 Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/jcp.31430 
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| Author Notes: | Janine Lückgen, Solvig Diederichs, Elisabeth Raqué, Tobias Renkawitz, Wiltrud Richter, Justyna Buchert |
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| 245 | 1 | 0 | |a Mechanoinduction of PTHrP/cAMP-signaling governs proteoglycan production in mesenchymal stromal cell-derived neocartilage |c Janine Lückgen, Solvig Diederichs, Elisabeth Raqué, Tobias Renkawitz, Wiltrud Richter, Justyna Buchert |
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| 520 | |a Abnormal mechanical loading is one of the major risk factors for articular cartilage degeneration. Engineered mesenchymal stromal cell (MSC)-derived cartilage holds great promise for cell-based cartilage repair. However, physiological loading protocols were shown to reduce matrix synthesis of MSC-derived neocartilage in vitro and the regulators of this undesired mechanoresponse remain poorly understood. Parathyroid hormone-related protein (PTHrP) is involved in cartilage development and can affect extracellular matrix (ECM) production during MSC chondrogenesis opposingly, depending on a continuous or transient exposure. PTHrP is induced by various mechanical cues in multiple tissues and species; but whether PTHrP is regulated in response to loading of human engineered neocartilage and may affect matrix synthesis in a positive or negative manner is unknown. The aim of this study was to investigate whether dynamic loading adjusts PTHrP-signaling in human MSC-derived neocartilage and whether it regulates matrix synthesis and other factors involved in the MSC mechanoresponse. Interestingly, MSC-derived chondrocytes significantly upregulated PTHrP mRNA (PTHLH) expression along with its second messenger cAMP in response to loading in our custom-built bioreactor. Exogenous PTHrP(1-34) induced the expression of known mechanoresponse genes (FOS, FOSB, BMP6) and significantly decreased glycosaminoglycan (GAG) and collagen synthesis similar to loading. The adenylate-cyclase inhibitor MDL-12,330A rescued the load-mediated decrease in GAG synthesis, indicating a direct involvement of cAMP-signaling in the reduction of ECM production. According to COL2A1-corrected hypertrophy-associated marker expression, load and PTHrP treatment shared the ability to reduce expression of MEF2C and PTH1R. In conclusion, the data demonstrate a significant mechanoinduction of PTHLH and a negative contribution of the PTHrP-cAMP signaling axis to GAG synthesis in MSC-derived chondrocytes after loading. To improve ECM synthesis and the mechanocompetence of load-exposed neocartilage, inhibition of PTHrP activity should be considered for MSC-based cartilage regeneration strategies. | ||
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| 650 | 4 | |a chondrocytes | |
| 650 | 4 | |a mesenchymal stromal cells | |
| 650 | 4 | |a parathyroid hormone-related protein | |
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