期刊
FREE RADICAL RESEARCH
卷 50, 期 7, 页码 767-780出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10715762.2016.1174775
关键词
Alpha-lipoic acid (ALA); ER stress; NF-kappa B; osteoarthritis; oxidative stress
资金
- Foundation of Liaoning Provincial Department of Education [L2015147]
- Natural Science Fund of Science and Technology Bureau of the Dalian Government [2015E12SF162]
Objective: The purpose of this study was to investigate whether alpha-lipoic acid (ALA) confers a chondroprotective effect on articular cartilage in rats with monosodium iodoacetate (MIA)-induced osteoarthritis (OA). Methods: Fifty male SD rats were divided into five groups, including SHAM-operated, MIA-induced OA, and three experimental groups treated with 50-, 100-, or 200-mg/kg ALA. After 14 d of ALA treatment, rats were sacrificed for joint macroscopic and histology assessments. The gene and protein expressions of markers related to chondrocyte phenotype, caspase proteins, NADPH oxidase 4 (Nox4), p22(phox), activation of nuclear factor-kappa B (NF-kappa B), and endoplasmic reticulum (ER) stress were measured by Western blot analyses or qRT-PCR. Results: The results showed that MIA injection successfully induced OA by causing cartilage degeneration. Morphological and histological examinations demonstrated that ALA treatment, especially 200 mg/kg of ALA, significantly ameliorated cartilage degeneration in rats with MIA-induced OA. ALA could effectively increase the levels of the collagen type II and aggrecan genes and inhibit apoptosis-related proteins expression. ALA reduced biomakers of oxidative damage and over-expression levels of Nox4 and p22(phox). ALA also suppressed ER stress and inhibited the activation of NF-kappa B pathway. Moreover, ALA obviously inhibited TNF-alpha secretion and Wnt/beta-catenin signaling way. Conclusion: These findings indicated that ALA might be a potential therapeutic agent for the protection of articular cartilage against progression of OA through inhibition of oxidative stress, ER stress, inflammatory cytokine secretion, and Wnt/beta-catenin activation.
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