Abstract
Objective
Nuclear transcription factor-κB (NF-κB) activation is a pivotal event in the pathogenesis of osteoarthritis (OA). OA patients frequently exhibit vitamin D (VD) deficiency, which is commonly associated with NF-κB activation. Our study aimed to investigate whether VD could protect against OA by modulating NF-κB pathway and to explore the underlying mechanisms.
Methods
Proteins levels were assessed by western blot analysis, gene expression was quantified by quantitative real-time polymerase chain reaction (qRT‒PCR) in vivo and in vitro. The expression of phosphorylated-p65 (p-p65) in knee OA rats was detected by immunohistochemistry, and an NF-κB nuclear translocation assay was validated in chondrocytes. Immunoprecipitation was employed to detect the interaction between NF-κB and vitamin D receptor (VDR) in vivo and in vitro. Small interfering RNA (Si-NF-κB and Si-VDR) transfection was used to investigate the role of NF-κB and VDR signaling pathway in knee OA rats under VD influence. Cartilage changes were visualized of knee OA rats using hematoxylin and eosin as well as safranin-O/fast green of staining.
Results
Our findings indicated that VD alleviates OA by inhibiting NF-κB pathway, which in turn reduces chondrocyte apoptosis and extracellular matrix (ECM) degradation. Further analysis revealed that VD primarily stabilizes NF-κB through the interaction of VDR and NF-κB, modulating the AMPK/mTOR signaling pathway to enhance autophagy and delay the progression of OA.
Conclusion
This study highlights the protective role of VD in OA by stabilization of NF-κB, mainly through the interaction between VDR and NF-κB. This interaction regulates the AMPK/mTOR signaling pathway, promoting autophagy and suggesting a potential therapeutic strategy for OA management.
Key Points |
• VD confers a protective effect on OA by primarily stabilizing NF-κB through the interaction between VDR and NF-κB, which in turn inhibits NF-κB phosphorylation and nuclear translocation. • In chondrocytes, VD helps shield against OA by blocking NF-κB’s entry into the nucleus, subsequently regulating autophagy via the AMPK/mTOR signaling pathway. |






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Data Availability
The datasets presented in this study are available from the corresponding authors with reasonable requests.
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Acknowledgements
We sincerely acknowledge the Centre for Scientific Research of Anhui Medical University and Centre for Scientific Research of the First Affiliated Hospital of Anhui Medical University foe valuable help in our experiments.
Funding
This research was funded by the National Natural Science Foundation of China (Grant No. 81802201).
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All procedures were approved by the Experimental Animal Ethics Committee of Anhui Medical University (Approval No: LLSC20211506). Consent for sample procurement was obtained from the donors, adhering strictly to the ethical guidelines of China and the principle of the Helsinki Declaration.
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Liu, P., Zhou, J., Cui, H. et al. 1,25(OH)2D3 induces chondrocyte autophagy and reduces the loss of proteoglycans in osteoarthritis through inhibiting the NF-κB pathway. Clin Rheumatol 44, 811–822 (2025). https://doi.org/10.1007/s10067-024-07281-z
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DOI: https://doi.org/10.1007/s10067-024-07281-z