Suppression of Src and Syk in the NF-κB signaling pathway by Olea europaea methanol extract is leading to its anti-inflammatory effects. (10th May 2019)

• Record Type: Journal Article
• Authors: Song, Chaoran; Hong, Yo Han; Park, Jae Gwang; Kim, Han Gyung; Jeong, Deok; Oh, Junsang; Sung, Gi-Ho; Hossain, Mohammad Amjad; Taamalli, Amani; Kim, Ji Hye; Kim, Jong-Hoon; Cho, Jae Youl
• Is Part Of: Journal of ethnopharmacology. Volume 235(2019)
• Page Start: 38
• Page End: 46
• Publication Date: 2019-05-10
• Subjects: Oe-ME Olea europaea L., (Oleaceae) methanol extract -- Oe-EE Olea europaea L., (Oleaceae) ethanol extract -- NO nitric oxide -- PGE2 prostaglandin E2 -- LPS lipopolysaccharide -- COX-2 cyclooxygenase-2 -- IL-1 interleukin-6 -- IL-6 interleukin-6 -- TNF-α tumor necrosis factor α -- NF-κB nuclear factor-κB -- AP-1 activator protein-1 -- PAMP pathogen-associated molecular pattern -- PRR pattern recognition receptor -- TLR Toll-like receptor -- iNOS inducible nitric oxide synthase -- ELISA enzyme linked immunosorbent assay -- MTT 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (a tetrazole) -- RT-PCR reverse transcriptase-polymerase chain reaction; Nω-nitro-L-arginine methyl ester hydrochloride (L-NAME) -- Prednisolone -- Quercetin; Olea europaea L., (Oleaceae) -- Anti-inflammatory effect -- NF-κB -- Syk -- Src; Ethnopharmacology -- Periodicals; Pharmacognosy -- Periodicals; Herbs -- Periodicals; Herbs -- Periodicals; Pharmacognosy -- Periodicals; Pharmacognosie -- Périodiques; Herbes -- Périodiques; 615.1
• DOI: 10.1016/j.jep.2019.01.024
• Languages: English
• ISSNs: 0378-8741

Abstract

Abstract: Ethnopharmacological relevance: Olea europaea L., (Oleaceae) has been used widely in folk medicine in the European Mediterranean islands, India, Asia, and other parts of the world. Although this plant has high ethnopharmacological value for treating inflammatory diseases, the molecular mechanisms of how it inhibits the inflammatory response are not fully understood. In this study, we sought to identify the anti-inflammatory mechanisms of this plant. Materials and methods: Using macrophages, we investigated the effects of O. europaea L. methanol extract (Oe-ME) and ethanol extract (Oe-EE) on the production of inflammatory mediator nitric oxide (NO) and prostaglandin E2 (PGE2 ), the expression levels of pro-inflammatory genes and intracellular inflammatory signaling activities. Results: Oe-ME and Oe-EE suppressed the production of NO in lipopolysaccharide-(LPS-), Pam3CSK4-, and poly (I:C)-stimulated RAW264.7 cells; importantly, no cytotoxicity was observed. Oe-ME and Oe-EE reduced production of PGE2 without exhibiting cytotoxicity. The mRNA expression levels of cyclooxygenase-2 (COX-2), inducible NO synthase (iNOS), IL-6, IL-1β, and tumor necrosis factor (TNF)-α were down-regulated by Oe-ME and Oe-EE. Nuclear fraction and whole lysate immunoblotting analyses and overexpression experiments strongly suggested that Oe-ME decreased the translocation of p65 and p50 (nuclear factors of the NF-κB subunit) as well as Src and Syk. Conclusion: These results suggest that Oe-ME exerts its anti-inflammatory effects by targeting Src and Syk in the NF-κB signaling pathway. Graphical abstract: fx1