title: Quercetin up-regulates expressions of peroxisome proliferator-activated receptor γ, liver X receptor α, and ATP binding cassette transporter A1 genes and increases cholesterol efflux in human macrophage cell line.
abstract: Cholesterol-laden macrophages trigger accumulation of foam cells and increase the risk of developing atherosclerosis. We hypothesized that quercetin could lower the content of cholesterol in macrophages by regulating the expression of the ATP binding cassette transporter A1 (ABCA1) gene in differentiated human acute monocyte leukemia cell line (THP-1) cells and thereby reducing the chance of forming foam cells. Quercetin, in concentrations up to 30 μM, was not cytotoxic to differentiated THP-1 cells. Quercetin up-regulated both ABCA1 messenger RNA and protein expression in differentiated THP-1 cells, and its maximum effects were demonstrated at 0.3 μM for 4 to 8 hours in incubation. In addition, quercetin increased protein levels of peroxisome proliferator-activated receptor γ (PPARγ) and liver X receptor α (LXRα) within 2 hours of treatment. Because PPARγ and LXRα are important transcriptional factors for ABCA1, quercetin-induced up-regulation of ABCA1 may be mediated by increased expression levels of the PPARγ and LXRα genes. Furthermore, quercetin-enhanced cholesterol efflux from differentiated THP-1 cells to both high-density lipoprotein (HDL) and apolipoprotein A1. Quercetin at the dose of 0.15 μM elevated the cholesterol efflux only for HDL. At the dose of 0.3 μM, quercetin demonstrated effects both on HDL and apolipoprotein A1. Our data demonstrated that quercetin increased the expressions of PPARγ, LXRα, and ABCA1 genes and cholesterol efflux from THP-1 macrophages. Quercetin-induced expression of PPARγ and LXRα might subsequently affect up-regulation of their target gene ABCA1. Taken together, ingestion of quercetin or quercetin-rich foods could be an effective way to improve cholesterol efflux from macrophages, which would contribute to lowering the risk of atherosclerosis.
authors: Department of Food and Nutrition and Institute of Health Sciences, Korea University, Seoul, Republic of Korea.
authors: Seung-Min
authors: SM
authors: Lee
authors: Jiyoung
authors: J
authors: Moon
authors: Yoonsu
authors: Y
authors: Cho
authors: Ji Hyung
authors: JH
authors: Chung
authors: Min-Jeong
authors: MJ
authors: Shin
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000378:metabolism*; D000975:Antioxidants / Q000494:pharmacology / Q000627:therapeutic use; D016632:Apolipoprotein A-I / Q000378:metabolism; D050197:Atherosclerosis / Q000378:metabolism* / Q000517:prevention & control; D002460:Cell Line; D002784:Cholesterol / Q000378:metabolism*; D008076:Cholesterol, HDL / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005487:Foam Cells / Q000378:metabolism; D015870:Gene Expression / Q000187:drug effects; D006801:Humans; D000071518:Liver X Receptors; D008264:Macrophages / Q000187:drug effects / Q000378:metabolism; D057093:Orphan Nuclear Receptors / Q000235:genetics / Q000378:metabolism*; D047495:PPAR gamma / Q000235:genetics / Q000378:metabolism*; D008517:Phytotherapy; D010936:Plant Extracts / Q000494:pharmacology* / Q000627:therapeutic use; D011794:Quercetin / Q000494:pharmacology* / Q000627:therapeutic use; D012333:RNA, Messenger / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D018528:ATP-Binding Cassette Transporters; D000975:Antioxidants; D016632:Apolipoprotein A-I; D008076:Cholesterol, HDL; D000071518:Liver X Receptors; C000605213:NR1H3 protein, human; D057093:Orphan Nuclear Receptors; D047495:PPAR gamma; D010936:Plant Extracts; D012333:RNA, Messenger; D002784:Cholesterol; D011794:Quercetin