Abstract
Microbial product lipopolysaccharide has been shown to be involved in the pathogenesis of inflammatory skin diseases. Parthenolide present in extracts of the herb feverfew has demonstrated an anti-inflammatory effect. However, the effect of parthenolide on the Akt/mTOR and NF-κB pathway activation-induced productions of inflammatory mediators in keratinocytes has not been studied. Using human keratinocytes, we investigated the effect of parthenolide on the inflammatory mediator production in relation to the Toll-like receptor-4-mediated-Akt/mTOR and NF-κB pathways, which regulate the transcription genes involved in immune and inflammatory responses. Parthenolide, Akt inhibitor, Bay 11–7085, and N-acetylcysteine each attenuated the lipopolysaccharide-induced production of IL-1β and PGE2, increase in the levels of cyclooxygenase, formation of reactive oxygen species, increase in the levels of Toll-like receptor-4, and activation of the Akt/mTOR and NF-κB in keratinocytes. The results show that parthenolide appears to attenuate the lipopolysaccharide-stimulated production of inflammatory mediators in keratinocytes by suppressing the Toll-like receptor-4-mediated activation of the Akt, mTOR, and NF-κB pathways. The activation of signaling transduction pathways appear to be regulated by reactive oxygen species. Parthenolide appears to attenuate the microbial product-mediated inflammatory skin diseases.
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This research was supported by the Chung-Ang University Research Scholarship Grants in 2015, Chung-Ang University, Seoul, South Korea.
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Nam, Y.J., Lee, D.H., Lee, M.S. et al. Sesquiterpene lactone parthenolide attenuates production of inflammatory mediators by suppressing the Toll-like receptor-4-mediated activation of the Akt, mTOR, and NF-κB pathways. Naunyn-Schmiedeberg's Arch Pharmacol 388, 921–930 (2015). https://doi.org/10.1007/s00210-015-1132-3
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DOI: https://doi.org/10.1007/s00210-015-1132-3