Title:Novel Leflunomide Analog, UTLOH-4e, Ameliorates Gouty Arthritis
Induced by Monosodium Urate Via NF-κB/NLRP3 Signaling Pathway
Volume: 25
Issue: 3
Author(s): Tianmin Yuan, Shilong Chen, Yifeng Yin, Jiajiu Shaw, Jin Zeng, Li Li, Lei Song, Yiguan Zhang, Zhujun Yin*Junning Zhao*
Affiliation:
- Translational Chinese Medicine Key Laboratory of Sichuan Province, Sichuan Academy of Chinese Medicine Sciences,
Chengdu, Sichuan, 610041, P.R. China
- Translational Chinese Medicine Key Laboratory of Sichuan Province,
Sichuan Institute for Translational Chinese Medicine, Chengdu, Sichuan, 610041, P.R. China
- Translational Chinese Medicine Key Laboratory of Sichuan Province, Sichuan Academy of Chinese Medicine Sciences,
Chengdu, Sichuan, 610041, P.R. China
- Translational Chinese Medicine Key Laboratory of Sichuan Province,
Sichuan Institute for Translational Chinese Medicine, Chengdu, Sichuan, 610041, P.R. China
Keywords:
UTLOH-4e, gouty arthritis, monosodium urate, nuclear factor-κB, pyrin domain-containing protein 3 (NLRP3) inflammasome, inflammation.
Abstract:
Background: Gouty arthritis (GA) is a common form of inflammatory arthritis caused
by intra-articular deposition of monosodium urate (MSU) crystals; however, there is a tremendous
lack of safe and effective therapy in the clinic.
Objective: The goal of this work was to investigate a novel leflunomide analogue, N-(2,4-
dihydroxyphenyl)-5-methyl-1,2-oxazole-3-carboxamide (UTLOH-4e), for its potential to prevent/
treat gouty arthritis.
Methods: In this study, the anti-inflammatory activity of UTLOH-4e was evaluated by MSUinduced
GA model in vivo and in vitro, and the molecular docking test was applied to estimate the
affinity of UTLOH-4e/UTL-5g/b for MAPKs, NF-κB, and NLRP3.
Results: In vitro, UTLOH-4e (1~100 μM) treatment inhibited the inflammatory reaction with no
obvious cytotoxicity in PMA-induced THP-1 macrophages exposed to MSU crystals for 24 h,
involving the prominent decreased production and gene expression of IL-1β, TNF-α, and IL-6.
Western blot analyses demonstrated that UTLOH-4e (1~100 μM) significantly suppressed the
activation of NLRP3 inflammasomes, NF-κB, and MAPK pathways. Furthermore, the data from
the experiment on gouty rats induced by intra-articular injection of MSU crystal confirmed that
UTLOH-4e markedly ameliorated rat paw swelling, articular synovium inflammation and reduced
the concentration of IL-1β and TNF-α in serum through down-regulating NLRP3 protein expression.
Conclusion: These results manifested that UTLOH-4e ameliorates GA induced by MSU crystals,
which contributes to the modulation of NF-κB/ NLRP3 signaling pathway, suggesting that UTLOH-
4e is a promising and potent drug candidate for the prevention and treatment of gouty arthritis.