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Quercetin-dependent scavenging of reactive nitrogen species derived from nitric oxide and nitrite in the human oral cavity: interaction of quercetin with salivary redox components.

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In the human oral cavity, nitrite is reduced to nitric oxide (NO) by certain bacteria. The NO formed reacts with O2 to generate NO2 and then with NO2 producing N2O3. In this study, N2O3 produced by the reaction between NO and NO2 was detected by fluorescence increase due to the transformation of

Kaempferol and quercetin, components of Ginkgo biloba extract (EGb 761), induce caspase-3-dependent apoptosis in oral cavity cancer cells.

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EGb 761, extracted from Ginkgo biloba leaves, has been proven to induce caspase-3-dependent apoptosis in oral cavity cancer cells. Since EGb 761 is a composition of various components, it is important to identify which components are responsible for its anticancer effects to reduce the total dosage

Efficient synergistic combination effect of Quercetin with Curcumin on breast cancer cell apoptosis through their loading into Apo ferritin cavity.

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Combination of natural agents has received a great attention in cancer treatment because of synergistically increased apoptotic effect on cancer cell lines by triggering several apoptotic signaling pathways. However, the hydrophobic nature, poor bioavailability and low cellular uptake of most

Citrus flavonoids luteolin, apigenin, and quercetin inhibit glycogen synthase kinase-3β enzymatic activity by lowering the interaction energy within the binding cavity.

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Pancreatic cancer studies have shown that inhibition of glycogen synthase kinase-3β (GSK-3β) leads to decreased cancer cell proliferation and survival by abrogating nuclear factor κB (NFκB) activity. In this investigation, various citrus compounds, including flavonoids, phenolic acids, and

Molecular simulations reveal a new entry site in quercetin 2,3-dioxygenase. A pathway for dioxygen?

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Molecular dynamics simulations performed on quercetin 2,3-dioxygenase have shown the existence of a channel linking the bulk solvent and the cavity of the enzyme. Although much is known about the the oxygenolysis reaction catalyzed by this enzyme, the way dioxygen enters the active site has not been

Functional analysis of the copper-dependent quercetin 2,3-dioxygenase. 1. Ligand-induced coordination changes probed by X-ray crystallography: inhibition, ordering effect, and mechanistic insights.

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The crystal structures of the copper-dependent Aspergillus japonicus quercetin 2,3-dioxygenase (2,3QD) complexed with the inhibitors diethyldithiocarbamate (DDC) and kojic acid (KOJ) are reported at 1.70 and 2.15 A resolution, respectively. Both inhibitors asymmetrically chelate the metal center and

A highly sensitive coupling technique for the determination of trace quercetin based on solid substrate room temperature phosphorimetry and poly (vinyl alcohol) complex imprinting.

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Al(3+) could react with quercetin (Q) to form [AlQ](3+) complex which could be used as a template for the preparation of poly (vinyl alcohol)-[AlQ](3+) complex imprinting (PVA-C-I). The [AlQ](3+) not only had good matching ability and selectivity with the cavity of PVA-C-I, but also could react with

Simulation of the substrate cavity dynamics of quercetinase.

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Molecular dynamics (MD) simulations have been performed on quercetin 2,3 dioxygenase (2,3QD) to study the mobility and flexibility of the substrate cavity. 2,3QD is the only firmly established Cu-containing dioxygenase known so far. It catalyses the breakage of the O-heterocycle of flavonols. The

Flavonoid glucosides are hydrolyzed and thus activated in the oral cavity in humans.

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Increasing epidemiological evidence supports the view that dietary flavonoids have protective roles in oral diseases, including cancer. However, the dietary forms of flavonoids, the flavonoid glycosides, must first be hydrolyzed to the aglycones, which is thought to occur mainly in the intestine. In

Quercetin but not luteolin suppresses the induction of lethal shock upon infection of mice with Salmonella typhimurium.

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Tumor necrosis factor-alpha (TNF-alpha) is important for the induction of systemic inflammatory responses that lead to lethal shock. Quercetin and luteolin, which differ by one hydroxyl group, are known to suppress the lipopolysaccharide-induced production of TNF-alpha in vitro. We show differing

Influence of excipients and technological process on anti-inflammatory activity of quercetin and Achyrocline satureioides (Lam.) D.C. extracts by oral route.

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The flavonoids quercetin, 3-O-methylquercetin and luteolin play an important role in the anti-inflammatory activity of Achyrocline satureioides ethanol extracts when administered intraperitoneally. The present work describes the oral anti-inflammatory effect of quercetin and A. satureioides extracts

The effects of selected dietary bioflavonoid supplementation on dental caries in young rats fed a high-sucrose diet.

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Recent evidence suggests that certain bioflavonoids reduce dental caries and cariogenic bacteria incidence. The present study evaluates two separate, but related, dietary trials -- trial 1, 0.09%, 0.18%, 0.36%, and 0.72% dietary naringenin (NAR) supplementation; and trial 2, 0.57% dietary rutin (R),

Investigation of the binding mechanism and inhibition of bovine liver catalase by quercetin: Multi-spectroscopic and computational study.

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Introduction: The study on the side effects of various drugs and compounds on enzymes is a main issue for monitoring the conformational and functional changes of them. Quercetin (3,5,7,3',4'-pentahydroxyflavone, QUE), a polyphenolic flavonoid, widely found in fruits, vegetables and it is used as an

Quercetin-dependent reduction of salivary nitrite to nitric oxide under acidic conditions and interaction between quercetin and ascorbic acid during the reduction.

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A salivary component, nitrate, is reduced to nitrite in the oral cavity. Polyphenols in foods are mixed with nitrite in the saliva to be swallowed into the stomach. An objective of the present study is to elucidate reactions between a polyphenol quercetin and a nitrite under acidic conditions.

Activation of rutin by human oral bacterial isolates to the carcinogen-mutagen quercetin.

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Oral streptococci, isolated from the mouths of 2 healthy subjects, hydrolysed innocuous rutin, a flavonoid glycoside, to its genotoxic aglycon quercetin, in vitro. The isolates were identified as Streptococcus milleri. The glycosidase, rutinase, was studied in cell-free extracts derived from one of

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