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The major dietary flavonol quercetin, which has been shown to improve endothelial function and decrease blood pressure, is extensively metabolized during absorption. This study examined the relative abilities of quercetin and its human metabolites to modulate the expression of eNOS and ET-1, which
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Cytokines released by inflammatory cells around the pancreatic islets are implicated in the pathogenesis of diabetes mellitus. Specifically, interleukin-1β (IL-1β) is known to be involved in islet β-cell damage by activation of nuclear factor-κB (NF-κB)-mediated inducible nitric oxide synthase
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In the present study, experiments were performed to explore the action of quercetin, the most widely distributed flavonoids, and its major metabolite, quercetin-3'-sulfate, on lipopolysaccharide (LPS)- and interferon-gamma (IFN-gamma)-induced nitric oxide (NO) production in BV-2 microglia. Quercetin
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Exposure of neutrophils to either lipopolysaccharide (LPS) or N-formyl-methionyl-leucyl-phenylalanine (fMLP) is associated with changes in the expression of cell adhesion molecules and elevation of intracellular calcium ions. Although dietary flavonoids are reported to possess anti-inflammatory
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Dietary flavonoids have been shown to have a number of anti-inflammatory properties, including decreasing the expression of adhesion molecules. Flavonoids however, are metabolised during absorption and the forms reaching the systemic circulation are glucuronidated, sulfated and methylated. Most
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Flavonoids have the potential to modulate inflammation by inhibition of cyclooxygenase-2 (COX-2) transcription. In this study, we compared the effect of the human flavonoid plasma metabolites (quercetin 3'-sulfate, quercetin 3-glucuronide and 3'-methylquercetin 3-glucuronide) on expression of COX-2
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Adhesion of circulating monocytes to vascular endothelial cells, a critical step in both inflammation and atherosclerosis, is mediated by cross-linkage of adhesion molecules expressed on the surface of both cell types. Dietary flavonoids have been shown to have anti-inflammatory properties,
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Cyclooxygenase-2 (COX-2)-catalysed synthesis of prostaglandin E2 plays a key role in inflammation and its associated diseases, such as cancer and cardiovascular disease. There are numerous reports demonstrating that flavonoids inhibit COX-2 activity. However, transcriptional regulation of COX-2 can
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Levels of inflammatory cytokines are raised in chronic obstructive pulmonary disease (COPD). A diet rich in antioxidant vitamins may protect against the development of COPD. This study examined the effects of phenolic compounds and food sources on cytokine and antioxidant production by A549 cells.
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