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Local intra-articular injection of rapamycin delays articular cartilage degeneration in a murine model of osteoarthritis

Takayama, K and Kawakami, Y and Kobayashi, M and Greco, N and Cummins, JH and Matsushita, T and Kuroda, R and Kurosaka, M and Fu, FH and Huard, J (2014) Local intra-articular injection of rapamycin delays articular cartilage degeneration in a murine model of osteoarthritis. Arthritis Research and Therapy, 16 (1). ISSN 1478-6354

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Abstract

© 2014 Takayama et al. Introduction: Recent studies have revealed that rapamycin activates autophagy in human chondrocytes preventing the development of osteoarthritis (OA) like changes in vitro, while the systemic injection of rapamycin reduces the severity of experimental osteoarthritis in a murine model of OA in vivo. Since the systemic use of rapamycin is associated with numerous side effects, the goal of the current study was to examine the beneficial effect of local intra-articular injection of rapamycin in a murine model of OA and to elucidate the mechanism of action of rapamycin on articular cartilage. Methods: Destabilization of the medial meniscus (DMM) was performed on 10-week-old male mice to induce OA. Intra-articular injections of 10 μl of rapamycin (10 μM) were administered twice weekly for 8 weeks. Articular cartilage damage was analyzed by histology using a semi-quantitative scoring system at 8 and 12 weeks after surgery. Mammalian target of rapamycin (mTOR), light chain 3 (LC3), vascular endothelial growth factor (VEGF), collagen, type X alpha 1 (COL10A1), and matrix metallopeptidase 13 (MMP13) expressions were analyzed by immunohistochemistry. VEGF, COL10A1, and MMP13 expressions were further examined via quantitative RT-PCR (qPCR). Results: Intra-articular injection of rapamycin significantly reduced the severity of articular cartilage degradation at 8 and 12 weeks after DMM surgery. A reduction in mTOR expression and the activation of LC3 (an autophagy marker) in the chondrocytes was observed in the rapamycin treated mice. Rapamycin treatment also reduced VEGF, COL10A1, and MMP13 expressions at 8 and 12 weeks after DMM surgery. Conclusion: These results demonstrate that the intra-articular injection of rapamycin could reduce mTOR expression, leading to a delay in articular cartilage degradation in our OA murine model. Our observations suggest that local intra-articular injection of rapamycin could represent a potential therapeutic approach to prevent OA.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Takayama, K
Kawakami, Y
Kobayashi, M
Greco, N
Cummins, JH
Matsushita, T
Kuroda, R
Kurosaka, M
Fu, FHffu@pitt.eduFFU
Huard, J
Centers: Other Centers, Institutes, Offices, or Units > Stem Cell Research Center
Date: 17 November 2014
Date Type: Publication
Journal or Publication Title: Arthritis Research and Therapy
Volume: 16
Number: 1
DOI or Unique Handle: 10.1186/s13075-014-0482-4
Schools and Programs: School of Medicine > Orthopaedic Surgery
Refereed: Yes
ISSN: 1478-6354
Date Deposited: 22 Dec 2016 14:52
Last Modified: 03 Feb 2019 10:55
URI: http://d-scholarship.pitt.edu/id/eprint/29451

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