Auraptene, a Monoterpene Coumarin, Inhibits LTA-Induced Inflammatory Mediators via Modulating NF- B/MAPKs Signaling Pathways

Chih Wei Hsia, Thanasekaran Jayakumar, Wan Jung Lu, Joen Rong Sheu, Chih Wei Hsia, Periyakali Saravana Bhavan, Manjunath Manubolu, Wei Chieh Huang, Yi Chang

Research output: Contribution to journalArticlepeer-review

Abstract

Objective. Oxidative stress-mediated inflammatory events involve in the progress of several diseases such as asthma, cancers, and multiple sclerosis. Auraptene (AU), a natural prenyloxycoumarin, possesses numerous pharmacological activities. Here, the anti-inflammatory effects of AU were investigated in lipoteichoic acid- (LTA-) induced macrophage cells (RAW 264.7). Methods. The expression of cyclooxygenase (COX-2), tumor necrosis factor (TNF-α), interleukin-1β (IL-1β), and inducible nitric oxide synthase (iNOS) and the phosphorylation of extracellular signal-regulated kinase (ERK) 1/2, p38 MAPK, c-Jun N-terminal kinase (JNK), heme oxygenase (HO-1), p65, and IBα were all identified by western blotting assay. The level of nitric oxide (NO) was measured by spectrometer analysis. The nuclear translocation of p65 nuclear factor kappa B (NF-B) was assessed by the confocal microscopic staining method. Native polyacrylamide gel electrophoresis was performed to perceive the activity of antioxidant enzyme catalase (CAT). Results. AU expressively reduced NO production and COX-2, TNF-α, IL-1 β, and iNOS expression in LTA-stimulated cells. AU at higher concentration (10 μM) inhibited ERK and JNK, but not p38 phosphorylation induced by LTA. Moreover, AU blocked IB and p65 phosphorylation, and p65 nuclear translocation. However, AU pretreatment was not effective on antioxidant HO-1 expression, CAT activity, and reduced glutathione (GSH, a nonenzymatic antioxidant), in LTA-induced RAW 264.7 cells. Conclusion. The findings of this study advocate that AU shows anti-inflammatory effects via reducing NF-B/MAPKs signaling pathways.

Original languageEnglish
Article number5319584
JournalEvidence-based Complementary and Alternative Medicine
Volume2021
DOIs
Publication statusPublished - 2021

ASJC Scopus subject areas

  • Complementary and alternative medicine

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