title: Suppressive effects of alloxanthin and diatoxanthin from Halocynthia roretzi on LPS-induced expression of pro-inflammatory genes in RAW264.7 cells.
abstract: To investigate anti-inflammatory effects of carotenoids from Halocynthia roretzi, gene expression levels were measured for pro-inflammatory cytokines and enzymes in the murine macrophage-like cell line, RAW264.7, stimulated with lipopolysaccharide (LPS). All-trans alloxanthin, all-trans diatoxanthin, and their 9-cis isomers isolated from H. roretzi significantly suppressed expression of IL-1beta and IL-6 mRNA in cells induced by LPS without cytotoxicity. The expression level of IL-1beta mRNA in cells treated with 25 microM all-trans alloxanthin for 24 h, followed by stimulation with 0.1 microg/mL LPS for 24 h in the presence of carotenoid decreased to 33.7+/-3.0% from that of control cells stimulated with LPS alone. All-trans diatoxanthin, 9-cis alloxanthin and 9-cis diatoxanthin also decreased expression of IL-1beta mRNA to 25.1+/-2.1, 28.2+/-0.9 and 32.9+/-3.3%, respectively, from that of control cells stimulated with LPS. IL-1beta production in culture medium was also suppressed by all-trans alloxanthin and all-trans diatoxanthin. Furthermore, all-trans alloxanthin, all-trans diatoxanthin and their 9-cis isomers suppressed the over-expression of cyclooxygenase-2 and nitric oxide synthase mRNA in RAW264.7 cells induced by LPS. The suppressive effects of these carotenoids were remarkable compared to those of beta-carotene and zeaxanthin.
authors.affiliation: Faculty of Fisheries Sciences, Hokkaido University, Hokkaido, Japan.
authors.forename: Izumi
authors.initials: I
authors.lastname: Konishi
authors.forename: Masashi
authors.initials: M
authors.lastname: Hosokawa
authors.forename: Tokutake
authors.initials: T
authors.lastname: Sashima
authors.forename: Takashi
authors.initials: T
authors.lastname: Maoka
authors.forename: Kazuo
authors.initials: K
authors.lastname: Miyashita
mesh_terms: D000818:Animals; D002338:Carotenoids / Q000302:isolation & purification / Q000494:pharmacology; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects / Q000235:genetics; D005786:Gene Expression Regulation / Q000187:drug effects* / Q000502:physiology; D018836:Inflammation Mediators / Q000037:antagonists & inhibitors* / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000633:toxicity*; D051379:Mice; D014561:Urochordata; D024341:Xanthophylls / Q000302:isolation & purification / Q000494:pharmacology* / Q000627:therapeutic use
chemical_list: D018836:Inflammation Mediators; D008070:Lipopolysaccharides; D024341:Xanthophylls; D002338:Carotenoids; C103105:diatoxanthin; C006462:alloxanthin