Abstract
The aim of this study was to examine the hypothesis that use of dimethyl fumarate (DMF) may mitigate arthritic symptoms in collagen-induced arthritis (CIA) rats through activation of NF-E2-related factor 2(Nrf-2) and suppression of NF-kB pathway. Arthritis in rats was induced by subcutaneous injection of collagen type II (200 µl) at the base of the tail. After induction arthritic rats were treated with DMF (25 mg/kg b.wt.) for 20 days from the day 25th to 45th. At the end of the study, serum and joint homogenate was used to assess the oxidative stress and cytokines level. In addition, mRNA expression of various genes such as NF-kB, Keap-1 (Kelch-like ECH-associated protein 1) and Nrf-2 was assayed through qRT-PCR in joint tissue. Finally, all these biochemical and molecular results were confirmed by histological and in silico study. Our results showed that decrease in the clinical severity, inflammation, and cell necrosis in DMF-treated rats. This was related with decrease in NF-kB activity and increase in activity of Nrf-2. Treatment with DMF increases the levels of endogenous antioxidant biomarkers glutathione (GSH), catalase (CAT), and superoxide dismutase (SOD) and decreases inflammation. These biochemical and molecular results were further confirmed by performing in silico study that shows DMF strongly inhibits the activation of NF-kB, and conversely at the same time increases the activity of Nrf-2 that means a significantly lower amount of inflammatory mediators and oxidants was produced. Decrease in inflammation leads to preserving the joint architecture and alleviation from clinical symptoms of arthritis. Collectively, these results indicate that Nrf-2 activation protects against arthritic symptoms.
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Data Availability
The data used to support the findings of this study are available from the corresponding author upon request.
Abbreviations
- CIA:
-
Collagen-induced arthritis
- LPO:
-
Lipid Peroxidation
- GSH:
-
Reduced glutathione
- CAT:
-
Catalase
- SOD:
-
Super Oxide Dismutase
- TNF-α:
-
Tumor necrosis factor-α
- IL-1β:
-
Interleukin-1β
- IL-10:
-
Interleukin-10
- COX-2:
-
Cyclooxygenase-2
- NF-kBp65:
-
Nuclear factor-kBp65
- Nrf-2:
-
Nuclear factor erythroid 2–related factor 2
- MDA:
-
Malondialdehyde
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Acknowledgements
We acknowledge the Department of Biochemistry, University College of Medical Sciences & GTB Hospital, New Delhi, India, for proving us basic infrastructure for performing experiments.
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MAK, RSA: designing of work, performing experimental work, data collection, and analysis; JA, GR performed the in silico study. All the authors read and approved the final manuscript.
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Highlights
This is first time we have reported the anti-arthritic effect of DMF through cross talk between NF-kB and Nrf-2/Keap-1 pathway. In our study, we found that DMF preserved the clinical severity in CIA rats through activation of Nrf-2 and simultaneous inhibition of NF-kB. Furthermore, in silico study was also performed to correlate the above results, and we found that DMF inhibits the activation of NF-kB. These findings may become beneficial, to develop a new therapeutic strategy in the treatment of RA.
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Khan, M.A., Rabbani, G., Aggarawal, J. et al. Divulging the Intricacies of Crosstalk Between NF-kB and Nrf-2/Keap1 Pathway in the Treatment of Arthritis by Dimethyl Fumarate. Appl Biochem Biotechnol 195, 4177–4195 (2023). https://doi.org/10.1007/s12010-023-04324-0
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DOI: https://doi.org/10.1007/s12010-023-04324-0