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- W2034851342 abstract "It is now recognized that innate immunity to intestinal microflora plays a significant role in mediating immune health, and modulation of microbial sensing may underpin the impact of plant natural products in the diet or when used as nutraceuticals. In this context, we have examined five classes of plant-derived flavonoids (flavonols, flavones, flavanones, catechins, and cyanidin) for their ability to regulate cytokine release induced by the Toll-like receptor 2 (TLR2) agonist Pam3CSK4. We found that the flavonols selectively co-stimulated IL-1β secretion but had no impact on the secretion of IL-6. Importantly, this costimulation of TLR2-induced cytokine secretion was dependent on regiospecific methylation of the flavonol scaffold with a rank order of quercetin-3,4'-dimethylether > quercetin-3-methylether > casticin. The mechanism underpinning this costimulation did not involve enhanced inflammasome activation. In contrast, the methylated flavonols enhanced IL-1β gene expression through transcriptional regulation, involving mechanisms that operate downstream of the initial NF-κB and STAT1 activation events. These studies demonstrate an exquisite level of control of scaffold bioactivity by regiospecific methylation, with important implications for understanding how natural products affect innate immunity and for their development as novel immunomodulators for clinical use." @default.
- W2034851342 created "2016-06-24" @default.
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- W2034851342 date "2013-07-01" @default.
- W2034851342 modified "2023-10-17" @default.
- W2034851342 title "Regiospecific Methylation of a Dietary Flavonoid Scaffold Selectively Enhances IL-1β Production following Toll-like Receptor 2 Stimulation in THP-1 Monocytes" @default.
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- W2034851342 doi "https://doi.org/10.1074/jbc.m113.453514" @default.
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