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Trihydroxyxanthones from the heartwood of Maclura cochinchinensis modulate M1/M2 macrophage polarisation and enhance surface TLR4

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Abstract

The anti-inflammatory actions of phytochemicals have attracted much attention due to the current state of numerous inflammatory disorders. Thai traditional medicine uses Maclura cochinchinensis (Lour.) Corner to treat chronic fever and various inflammatory diseases, as well as to maintain normal lymphatic function. Five flavonoids and five xanthones were isolated from the heartwood of M. cochinchinensis and we investigated the anti-inflammatory properties of the isolated compounds. All isolated compounds possessed an anti-inflammatory effect by decreasing prostaglandin E2 (PGE2) synthesis in lipopolysaccharide (LPS)-activated murine macrophages with varying degrees of potency. The greatest decrease in M1 inflammatory mediators, nitric oxide, PGE2, and proinflammatory cytokines was observed with 1,3,7-trihydroxyxanthone and 1,3,5-trihydroxyxanthone treatment of LPS-activated macrophages. The anti-inflammatory mechanism of the two xanthones is mediated by the suppression of inducible nitric oxide synthase, cyclooxygenase-2, and phosphatidylinositol 3-kinase/protein kinase B expression and the upregulation of M2 anti-inflammatory signalling proteins phosphorylated signal transducer and activator of transcription 6 and peroxisome proliferator-activated receptors-γ. 1,3,7-Trihydroxyxanthone exhibits superior induction of anti-inflammatory M2 mediator of LPS-activated macrophages by upregulating arginase1 expression. Following the resolution of inflammation, the two xanthones enhanced surface TLR4 expression compared to LPS-stimulated cells, possibly preserving macrophage function. Our research highlights the role of the two xanthones in modulating the M1/M2 macrophage polarisation to reduce inflammation and retain surface TLR4 once inflammation has been resolved. These findings support the use of xanthones for their anti-inflammatory effects in treating inflammatory dysregulation.

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Acknowledgements

This research was supported by Thai Traditional Medical Knowledge Fund, Department of Thai Traditional and Alternative Medicine, Ministry of Public Health and the new strategic research (P2P) project of Walailak University, Nakhon Si Thammarat, Thailand. C. Jansakun expresses her gratitude to The Royal Golden Jubilee Ph.D. Program (Grant No. RGJ PHD/0216/2561). A. Suksamrarn, J. Hata, and W. Pabuprapap acknowledge partial support from the Center of Excellence for Innovation in Chemistry, Ministry of Higher Education, Science, Research, and Innovation. We would like to thank Editage (www.editage.com) for English language editing.

Funding

This research was supported by Thai Traditional Medical Knowledge Fund, Department of Thai Traditional and Alternative Medicine, Ministry of Public Health and the new strategic research (P2P) project of Walailak University, Nakhon Si Thammarat, Thailand. C. Jansakun expresses her gratitude to The Royal Golden Jubilee Ph.D. Program (Grant No. RGJ PHD/0216/2561). A. Suksamrarn, J. Hata, and W. Pabuprapap acknowledge partial support from the Center of Excellence for Innovation in Chemistry, Ministry of Higher Education, Science, Research, and Innovation.

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Conceptualization: CJ and WarC; methodology: CJ, WanC, TU, and WarC; validation: TU and WarC; formal analysis: CJ and OM; investigation: CJ, WanC, JH, and NS; resources: WP; data curation: CJ and WarC; writing—original draft preparation; CJ; writing—review and editing: CJ, WarC, and AS; supervision and funding acquisition: TU, WarC, and AS. All authors read and approved the final manuscript.

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Correspondence to Warangkana Chunglok.

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Jansakun, C., Chulrik, W., Hata, J. et al. Trihydroxyxanthones from the heartwood of Maclura cochinchinensis modulate M1/M2 macrophage polarisation and enhance surface TLR4. Inflammopharmacol 31, 529–541 (2023). https://doi.org/10.1007/s10787-022-01121-9

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  • DOI: https://doi.org/10.1007/s10787-022-01121-9

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