Abstract
Objective
To explore the mechanism of effects of total saponin fraction from Dioscorea Nipponica Makino (TSDN) on M1/M2 polarization of monocytes/macrophages and arachidonic acid (AA) pathway in rats with gouty arthritis (GA).
Methods
Seventy-two Sprague Dawley rats were randomly divided into 4 groups (n=18 in each): normal, model, TSDN at 160 mg/kg, and celecoxib at 43.3 mg/kg. Monosodium urate crystal (MSU) was injected into the rats’ ankle joints to induce an experimental GA model. Blood and tissue samples were collected on the 3rd, 5th, and 8th days of drug administration. Histopathological changes in the synovium of joints were observed via hematoxylin and eosin (HE) staining. The expression levels of arachidonic acid (AA) signaling pathway were assessed via real-time polymerase chain reaction (qPCR) and Western blot. Flow cytometry was used to determine the proportion of M1 and M2 macrophages in the peripheral blood. An enzyme-linked immunosorbent assay (ELISA) was used to detect interleukine (IL)-1 β, tumor necrosis factor-alpha (TNF-α), IL-4, IL-10, prostaglandin E2 (PGE2), and leukotriene B4 (LTB4).
Results
HE staining showed that TSDN improved the synovial tissue. qPCR and Western blot showed that on the 3rd, 5th and 8th days of drug administration, TSDN reduced the mRNA and protein expressions of cyclooxygenase (COX)2, microsomal prostaglandin E synthase-1 derived eicosanoids (mPGES-1), 5-lipoxygenase (5-LOX), recombinant human mothers against decapentaplegic homolog 3 (Smad3), nucleotide-binding oligomerization domain-like receptor protein 3 (NALP3), and inducible nitric oxide synthase (iNOS) in rats’ ankle synovial tissues (P<0.01). TSDN decreased COX1 mRNA and protein expression on 3rd and 5th day of drug administration and raised it on the 8th day (both P<0.01). It lowered CD68 protein expression on days 3 (P<0.01), as well as mRNA and protein expression on days 5 and 8 (P<0.01). On the 3rd, 5th, and 8th days of drug administration, TSDN elevated the mRNA and protein expression of Arg1 and CD163 (P<0.01). Flow cytometry results showed that TSDN decreased the percentage of M1 macrophages while increasing the percentage of M2 in peripheral blood (P<0.05 or P<0.01). ELISA results showed that on the 3rd, 5th, and 8th days of drug administration, TSDN decreased serum levels of IL-1 β, TNF-α, and LTB4 (P<0.01), as well as PGE2 levels on days 3rd and 8th days (P<0.05 or P<0.01); on day 8 of administration, TSDN increased IL-4 serum levels and enhanced IL-10 contents on days 5 and 8 (P<0.05 or P<0.01).
Conclusion
The anti-inflammatory effect of TSDN on rats with GA may be achieved by influencing M1/M2 polarization through AA signaling pathway.
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Zhou Q, Sun HJ, Liu SM. Effects of total saponins from Dioscorea Nipponica Makino on monosodium urate-induced M1-polarized macrophages through arachidonic acid signaling pathway: an in vitro study. Chin J Integr Med 2022. doi: https://doi.org/10.1007/s11655-022-3721-6.
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Zhou Q designed and carried out the experiment and wrote this paper, Sun HJ carried part of the experiment, and Zhang XW helped revising this paper.
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Supported by Joint Guidance Project of Heilongjiang Natural Science Foundation (No. LH2021H099); Start Fund of Postdoctoral Research in Heilongjiang Province (No. LBH-Q19188); Outstanding Youth Development Fund of Heilongjiang University of Chinese Medicine (No. 2019JC06); Project of Heilongjiang Administration of Traditional Chinese Medicine (No. ZHY202094); Graduate Innovative Scientific Research Project of Heilongjiang University of Chinese Medicine (No. 2020yjscx057); Natural Science Foundation of Heilongjiang Province (Key Project, No. ZD2020H006)
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Zhou, Q., Sun, Hj. & Zhang, Xw. Total Saponin Fraction of Dioscorea Nipponica Makino Improves Gouty Arthritis Symptoms in Rats via M1/M2 Polarization of Monocytes and Macrophages Mediated by Arachidonic Acid Signaling. Chin. J. Integr. Med. 29, 1007–1017 (2023). https://doi.org/10.1007/s11655-022-3729-y
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DOI: https://doi.org/10.1007/s11655-022-3729-y