title: Citrus flavonoid 5-demethylnobiletin suppresses scavenger receptor expression in THP-1 cells and alters lipid homeostasis in HepG2 liver cells.
abstract: METHODS
  Nobiletin, a polymethoxyflavone from the peel of citrus fruits, has been reported to inhibit modified LDL uptake in macrophages and enhance hepatic LDL receptor expression and activity. We report the anti-atherogenic effect and mechanism of 5-demethylnobiletin, an auto-hydrolysis product of nobiletin.
  
  
  RESULTS
  5-Demethylnobiletin significantly attenuated phorbol 12-myristate 13-acetate-induced gene expression and activity of scavenger receptors, CD36, scavenger receptor-A and lectin-like oxidized LDL receptor-1. The inhibitory effect is partly associated with the inhibition of protein-kinase C activity and c-Jun NH(2) -terminal kinase 1/2 phosphorylation, thereby inhibiting the activation of activator protein-1 and nuclear factor-κB. 5-Demethylnobiletin treatment also led to reduction of oxidized LDL-induced CD36 mRNA expression and blockade of 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanide perchlorate-modified LDL uptake in THP-1-derived macrophages. In the human hepatoma cell line HepG2, 5-demethylnobiletin significantly induced LDL receptor activity and transcription, at least in part, through steroid-response element-binding protein-2 activation. 5-Demethylnobiletin also decreased the mRNA expression of acyl CoA:diacylglycerol acyltransferase 2, the key enzyme involved in the hepatic triacylglycerol biosyntheses.
  
  
  CONCLUSIONS
  Current results suggest that 5-demethylnobiletin has diverse anti-atherogenic bioactivities. It is more potent in inhibiting monocyte-to-macrophage differentiation and foam cell formation than its permethoxylated counterpart, nobiletin. It exhibits similar hypolipidemic activity as nobiletin and both can enhance LDL receptor gene expression and activity and decreased acyl CoA:diacylglycerol acyltransferase 2 expression.
authors.affiliation: Department of Molecular Biology and Human Genetics, Tzu Chi University, Hualien, Taiwan.
authors.forename: Jui-Hung
authors.initials: JH
authors.lastname: Yen
authors.forename: Ching-Yi
authors.initials: CY
authors.lastname: Weng
authors.forename: Shiming
authors.initials: S
authors.lastname: Li
authors.forename: Ya-Hsuan
authors.initials: YH
authors.lastname: Lo
authors.forename: Min-Hsiung
authors.initials: MH
authors.lastname: Pan
authors.forename: Shih-Hang
authors.initials: SH
authors.lastname: Fu
authors.forename: Chi-Tang
authors.initials: CT
authors.lastname: Ho
authors.forename: Ming-Jiuan
authors.initials: MJ
authors.lastname: Wu
mesh_terms: D050197:Atherosclerosis / Q000188:drug therapy*; D039481:CD11b Antigen / Q000032:analysis; D002454:Cell Differentiation; D002957:Citrus / Q000737:chemistry*; D047309:Flavones / Q000494:pharmacology*; D005487:Foam Cells / Q000187:drug effects; D056945:Hep G2 Cells; D006801:Humans; D006903:Hydroxymethylglutaryl CoA Reductases / Q000235:genetics; D050356:Lipid Metabolism / Q000187:drug effects*; D008264:Macrophages / Q000166:cytology; D009000:Monocytes / Q000166:cytology; D016328:NF-kappa B / Q000378:metabolism; D011493:Protein Kinase C / Q000378:metabolism; D011973:Receptors, LDL / Q000187:drug effects; D051116:Receptors, Scavenger / Q000187:drug effects* / Q000235:genetics; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D018808:Transcription Factor AP-1 / Q000378:metabolism
chemical_list: D039481:CD11b Antigen; D047309:Flavones; C509295:ITGAM protein, human; D016328:NF-kappa B; D011973:Receptors, LDL; D051116:Receptors, Scavenger; D018808:Transcription Factor AP-1; C008661:nobiletin; D006903:Hydroxymethylglutaryl CoA Reductases; D011493:Protein Kinase C; D013755:Tetradecanoylphorbol Acetate