Abstract
OBJECTIVE: Joint distraction triggers intrinsic cartilage repair in animal models of osteoarthritis (OA), corroborating observations in human OA patients treated with joint distraction. The present study explores the still largely elusive mechanism initiating this repair process.
DESIGN: Unilateral OA was induced in the knee joint of 8 dogs using the groove model; the contralateral joint served as a control. After 10 weeks, 4 animals received joint distraction, the other 4 serving as OA controls. Halfway the distraction period (after 4 weeks of a standard 8-week distraction treatment), all animals were euthanized, and joint tissues were collected. A targeted quantitative reverse transcription polymerase chain reaction (qRT-PCR) analysis was performed of commonly involved processes including matrix catabolism/anabolism, inflammation, and known signaling pathways in OA. In addition, cartilage changes were determined on tissue sections using the canine OARSI (Osteoarthritis Research Society International) histopathology score and collagen type II (COL2A1) immunostaining.
RESULTS: Midway distraction, the distracted OA joint showed an upregulation of proteolytic genes, for example, ADAMTS5, MMP9, MMP13, compared to OA alone and the healthy joints, which correlated with an increased OARSI score. Additionally, genes of the transforming growth factor (TGF)-β and Notch pathway, and markers associated with progenitor cells were increased.
CONCLUSIONS: Joint distraction initiates both catabolic and anabolic transcriptional responses. The enhanced turnover, and thereby renewal of the matrix, could be the key to the cartilage repair observed in the months after joint distraction.
| Original language | English |
|---|---|
| Pages (from-to) | 1654S-1664S |
| Journal | Cartilage |
| Volume | 13 |
| Issue number | 2_suppl |
| Early online date | 20 May 2021 |
| DOIs | |
| Publication status | Published - 1 Dec 2021 |
Bibliographical note
Funding Information:The authors would like to thank P. M. Roermund for his assistance during application of the distraction device in the in vivo experiment. The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This project was financially supported by the Dutch Arthritis Society (LLP9 and LLP22) and NWO Applied and Engineering Sciences (P15-23). There is no further involvement in the present work of the above-mentioned sources.
Publisher Copyright:
© The Author(s) 2021.
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
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SDG 3 Good Health and Well-being
Keywords
- cartilage regeneration
- groove model
- osteoarthritis
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