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Article Open Access

MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy

  • Authors:
    • Chun-Na Lan
    • Wei-Jun Cai
    • Jie Shi
    • Zhong-Jie Yi
  • View Affiliations / Copyright

    Affiliations: Department of Rehabilitation, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China, Department of Histology and Embryology, School of Basic Medicine, Central South University, Changsha, Hunan 410013, P.R. China, Department of General Surgery, The Third Xiangya Hospital of Central South University, Changsha, Hunan 410013, P.R. China, Department of Burn and Plastic Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan 410011, P.R. China
    Copyright: © Lan et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 829
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    Published online on: September 28, 2021
       https://doi.org/10.3892/mmr.2021.12469
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Abstract

Osteoarthritis (OA) is a chronic, age‑related osteoarthropathy that causes a considerable decline in quality of life, as well as economic losses due to its high incidence and poor prognosis. Mitogen‑activated protein kinases (MAPKs) regulate multiple cellular processes, including proliferation, differentiation and apoptosis, in certain diseases, such as cancer, diabetes and Alzheimer's disease. The present study aimed to investigate the regulatory role of the MAPK signaling pathway in early‑stage OA. A rabbit model of early‑stage OA was induced by treatment with the enzyme papain. U0126 [an extracellular signal‑regulated kinase (ERK) inhibitor], SP600125 [a Jun NH2‑terminal kinase (JNK) inhibitor] and SB203580 (a p38 inhibitor) were administered to the rabbits via intra‑articular injection. The severity of OA was assessed by histological examination using H&E, toluidine blue and safranin‑O/fast green staining, as well by analyzing the glycosaminoglycan (GAG) content and determining the OA Research Society International (OARSI) score. Western blotting was used to detect the protein expression levels of matrix metalloproteinase‑3 (MMP3), ERK, phosphorylated (p)‑ERK, p38, p‑p38, JNK, p‑JNK, Beclin1, UNC‑51‑like kinase 1 (ULK1) and microtubule‑associated protein 1 light chain 3 (LC3)II/I. U0126, SP600125 or SB203580 treatment significantly decreased the OARSI scores and significantly increased the GAG levels in the cartilaginous tissues of OA model rabbits. These results indicated that the MAPK inhibitors reduced the severity of OA‑induced injury at the early stage. Western blotting results demonstrated that MAPK inhibition significantly decreased the protein expression levels of MMP3 in OA cartilage. The protective effect of MAPK inhibitors in OA was mediated via the activation of autophagy, as demonstrated by the increased protein expression levels of LC3II/I, ULK1 and Beclin1. Overall, the data indicated that MAPK inhibitors may exert a protective effect against OA by restoring compromised autophagy. Furthermore, the present study suggested that MAPK inhibitors may represent a potential pharmacological strategy for treating OA in the future.
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Copy and paste a formatted citation
Spandidos Publications style
Lan C, Cai W, Shi J and Yi Z: MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy. Mol Med Rep 24: 829, 2021.
APA
Lan, C., Cai, W., Shi, J., & Yi, Z. (2021). MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy. Molecular Medicine Reports, 24, 829. https://doi.org/10.3892/mmr.2021.12469
MLA
Lan, C., Cai, W., Shi, J., Yi, Z."MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy". Molecular Medicine Reports 24.6 (2021): 829.
Chicago
Lan, C., Cai, W., Shi, J., Yi, Z."MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy". Molecular Medicine Reports 24, no. 6 (2021): 829. https://doi.org/10.3892/mmr.2021.12469
Copy and paste a formatted citation
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Spandidos Publications style
Lan C, Cai W, Shi J and Yi Z: MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy. Mol Med Rep 24: 829, 2021.
APA
Lan, C., Cai, W., Shi, J., & Yi, Z. (2021). MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy. Molecular Medicine Reports, 24, 829. https://doi.org/10.3892/mmr.2021.12469
MLA
Lan, C., Cai, W., Shi, J., Yi, Z."MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy". Molecular Medicine Reports 24.6 (2021): 829.
Chicago
Lan, C., Cai, W., Shi, J., Yi, Z."MAPK inhibitors protect against early‑stage osteoarthritis by activating autophagy". Molecular Medicine Reports 24, no. 6 (2021): 829. https://doi.org/10.3892/mmr.2021.12469
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