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.
Graphical Abstract
[http://dx.doi.org/10.1016/S0140-6736(16)00346-9] [PMID: 27112094]
[http://dx.doi.org/10.1038/s41572-019-0115-y] [PMID: 31558729]
[http://dx.doi.org/10.1016/j.maturitas.2018.10.012] [PMID: 30415758]
[http://dx.doi.org/10.1136/annrheumdis-2013-204680] [PMID: 24590181]
[http://dx.doi.org/10.1038/s41584-020-0441-1] [PMID: 32541923]
[http://dx.doi.org/10.1038/nrrheum.2015.91] [PMID: 26150127]
[http://dx.doi.org/10.3389/fphar.2017.00123] [PMID: 28360855]
[http://dx.doi.org/10.1002/art.27663] [PMID: 20662058]
[http://dx.doi.org/10.1186/ar2952] [PMID: 20441605]
[http://dx.doi.org/10.1002/art.38369] [PMID: 24470119]
[http://dx.doi.org/10.1038/s12276-019-0244-0] [PMID: 31028244]
[http://dx.doi.org/10.1101/cshperspect.a000158] [PMID: 20300203]
[http://dx.doi.org/10.3389/fimmu.2018.02248] [PMID: 30356764]
[http://dx.doi.org/10.1038/cdd.2015.176] [PMID: 26868913]
[http://dx.doi.org/10.1016/j.kjms.2015.07.007] [PMID: 26520688]
[http://dx.doi.org/10.1159/000490184] [PMID: 29843128]
[http://dx.doi.org/10.1016/S0149-2918(00)86732-6] [PMID: 10890256]
[http://dx.doi.org/10.2174/13816128113199990584] [PMID: 23944378]
[http://dx.doi.org/10.1124/dmd.31.10.1240] [PMID: 12975333]
[http://dx.doi.org/10.1124/dmd.110.036285] [PMID: 21045198]
[http://dx.doi.org/10.5099/aj110100031]
[http://dx.doi.org/10.1016/j.ejphar.2017.05.049] [PMID: 28576409]
[http://dx.doi.org/10.1016/0040-4020(68)88130-X]
[http://dx.doi.org/10.1007/s10930-020-09953-6] [PMID: 33421024]
[http://dx.doi.org/10.1080/07391102.2020.1852968] [PMID: 33251943]
[http://dx.doi.org/10.1002/jcc.21334] [PMID: 19499576]
[http://dx.doi.org/10.1002/bmb.20966] [PMID: 27241834]
[http://dx.doi.org/10.1093/nar/gkv315] [PMID: 25873628]
[http://dx.doi.org/10.1016/j.semarthrit.2020.04.008] [PMID: 32620196]
[http://dx.doi.org/10.1016/j.rdc.2019.08.001] [PMID: 31564298]
[http://dx.doi.org/10.1002/ijc.2910260208] [PMID: 6970727]
[http://dx.doi.org/10.1016/j.atherosclerosis.2011.09.003] [PMID: 21978918]
[http://dx.doi.org/10.1002/jlb.59.4.555] [PMID: 8613704]
[http://dx.doi.org/10.1021/nn2000756] [PMID: 21344890]
[http://dx.doi.org/10.2337/db14-1225] [PMID: 25552600]
[http://dx.doi.org/10.1136/ard.2003.015743] [PMID: 15361402]
[http://dx.doi.org/10.1007/s00296-005-0617-7] [PMID: 15933855]
[http://dx.doi.org/10.1097/BOR.0000000000000143] [PMID: 25633244]
[http://dx.doi.org/10.1136/annrheumdis-2016-209707] [PMID: 27457514]
[http://dx.doi.org/10.4049/jimmunol.1402167] [PMID: 25567679]
[http://dx.doi.org/10.1007/s12011-019-01841-0] [PMID: 31332706]
[http://dx.doi.org/10.3389/fimmu.2019.01108] [PMID: 31156650]
[PMID: 28630380]
[http://dx.doi.org/10.1084/jem.20171419] [PMID: 29021150]
[http://dx.doi.org/10.1038/nrrheum.2017.155] [PMID: 28959043]
[http://dx.doi.org/10.1007/978-981-13-9367-9_10] [PMID: 31628658]
[http://dx.doi.org/10.1016/j.jmb.2013.11.024] [PMID: 24316048]
[http://dx.doi.org/10.1007/s10753-013-9766-0] [PMID: 24162780]
[http://dx.doi.org/10.1186/ar2729] [PMID: 19835640]
[http://dx.doi.org/10.1016/j.bcp.2011.06.043] [PMID: 21763290]
[http://dx.doi.org/10.1016/j.bbapap.2005.08.017] [PMID: 16198162]
[http://dx.doi.org/10.1093/rheumatology/kex142] [PMID: 28431044]