title: Quercetin tetraacetyl derivative inhibits LPS-induced nitric oxide synthase (iNOS) expression in J774A.1 cells.
abstract: In inflammation, nitric oxide (NO) acts as a pro-inflammatory mediator, which is synthesized by inducible nitric oxide synthase (iNOS) in response to pro-inflammatory agents such as lipopolysaccharide (LPS). Quercetin (Qt) has anti-inflammatory properties through its ability to inhibits nitric oxide production and iNOS expression in different cellular types. In the present study, we evaluated the effect of a semi-synthetic acetyl (quercetin-3,5,7,3'-tetraacetyl: TAQt) Qt derivative and two natural sulphated (quercetin-3-acetyl-7,3',4'-trisulphate: ATS and quercetin-3,7,3',4'-tetrasulphate: QTS) Qt derivatives on the LPS-induced NO production and iNOS expression in J774A.1 cells. Our results demonstrate that only TAQt inhibited the NO production by decreasing the iNOS mRNA and protein levels. In addition, we showed that TAQt blocked the LPS-induced nuclear NF-kappaB translocation by inhibiting the IkappaB-alpha degradation. Hence, as TAQt inhibited the LPS-induced iNOS expression and NO production, it could therefore be considered as a potential therapeutic agent for the treatment of inflammatory diseases related with the NO system.
authors.affiliation: Farmacognosia, Departamento de Farmacia, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, Argentina.
authors.forename: M G
authors.initials: MG
authors.lastname: Ortega
authors.forename: A C
authors.initials: AC
authors.lastname: Saragusti
authors.forename: J L
authors.initials: JL
authors.lastname: Cabrera
authors.forename: G A
authors.initials: GA
authors.lastname: Chiabrando
mesh_terms: D000818:Animals; D000893:Anti-Inflammatory Agents / Q000494:pharmacology*; D000975:Antioxidants / Q000494:pharmacology; D002460:Cell Line; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D020672:I-kappa B Proteins / Q000378:metabolism; D007249:Inflammation / Q000188:drug therapy / Q000378:metabolism; D018836:Inflammation Mediators / Q000378:metabolism; D008070:Lipopolysaccharides / Q000494:pharmacology*; D008264:Macrophages; D051379:Mice; D000072000:NF-KappaB Inhibitor alpha; D016328:NF-kappa B / Q000378:metabolism; D009569:Nitric Oxide / Q000096:biosynthesis; D052247:Nitric Oxide Synthase Type II / Q000096:biosynthesis*; D011794:Quercetin / Q000031:analogs & derivatives / Q000494:pharmacology*; D012333:RNA, Messenger / Q000096:biosynthesis
chemical_list: D000893:Anti-Inflammatory Agents; D000975:Antioxidants; D020672:I-kappa B Proteins; D018836:Inflammation Mediators; D008070:Lipopolysaccharides; D016328:NF-kappa B; C000606205:Nfkbia protein, mouse; D012333:RNA, Messenger; D000072000:NF-KappaB Inhibitor alpha; D009569:Nitric Oxide; D011794:Quercetin; D052247:Nitric Oxide Synthase Type II; C496317:Nos2 protein, mouse