title: ABCG5/ABCG8 in cholesterol excretion and atherosclerosis.
abstract: Cholesterol is essential for the growth and function of all mammalian cells, but abnormally increased blood cholesterol is a major risk factor for atherosclerotic cardiovascular disease. ATP-binding cassette (ABC) transporters G5 (ABCG5) and G8 (ABCG8) form an obligate heterodimer that limits intestinal absorption and facilitates biliary secretion of cholesterol and phytosterols. Consistent with their function, ABCG5 and ABCG8 are located on the apical membrane of enterocytes and hepatocytes. Liver X receptor is the major positive regulator of ABCG5 and ABCG8 expression. Mutations in either of the two genes cause sitosterolemia, a condition in which cholesterol and plant sterols accumulate in the circulation leading to premature cardiovascular disease. Overexpression of ABCG5 and ABCG8 in mice retards diet-induced atherosclerosis because of reduced circulating and hepatic cholesterol. In the current review, we summarize recent developments and propose a future framework that provides new perspectives on the regulation of cholesterol metabolism and treatment of atherosclerotic cardiovascular disease.
authors.affiliation: Life Science Research Center, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Xiao-Hua
authors.initials: XH
authors.lastname: Yu
authors.affiliation: The Second Affiliated Hospital, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Kun
authors.initials: K
authors.lastname: Qian
authors.affiliation: The Second Affiliated Hospital, University of South China, Hengyang, Hunan 421001, China.
authors.forename: Na
authors.initials: N
authors.lastname: Jiang
authors.affiliation: Department of Biochemistry and Molecular Biology, The Libin Cardiovascular Institute of Alberta, The University of Calgary, Health Sciences Center, 3330 Hospital Dr NW, Calgary, Alberta T2N 4N1, Canada.
authors.forename: Xi-Long
authors.initials: XL
authors.lastname: Zheng
authors.affiliation: Department of Physiology, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
authors.forename: Francisco S
authors.initials: FS
authors.lastname: Cayabyab
authors.affiliation: Life Science Research Center, University of South China, Hengyang, Hunan 421001, China; Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, University of South China, Hengyang, Hunan 421001, China. Electronic address: tangchaoke@qq.com.
authors.forename: Chao-Ke
authors.initials: CK
authors.lastname: Tang
mesh_terms: D000071018:ATP Binding Cassette Transporter, Subfamily G, Member 5; D000071019:ATP Binding Cassette Transporter, Subfamily G, Member 8; D018528:ATP-Binding Cassette Transporters / Q000378:metabolism*; D000818:Animals; D050197:Atherosclerosis / Q000378:metabolism*; D002784:Cholesterol / Q000378:metabolism*; D006801:Humans; D008074:Lipoproteins / Q000378:metabolism*
chemical_list: C416945:ABCG5 protein, human; C416946:ABCG8 protein, human; D000071018:ATP Binding Cassette Transporter, Subfamily G, Member 5; D000071019:ATP Binding Cassette Transporter, Subfamily G, Member 8; D018528:ATP-Binding Cassette Transporters; D008074:Lipoproteins; D002784:Cholesterol
keywords: ABCG5; ABCG8; ATP-binding cassette transporter G5; ATP-binding cassette transporter G8; Atherosclerosis; Cholesterol; ER; ET; GATA-binding protein 4; GATA4; HDL; HNF4α; LDL-C; LDLR; LXR; NBD; NPC1L1; Niemann–Pick C1-Like 1; PUFAs; SNP; Sitosterolemia; TH; VLDL-C; apoA-I; apolipoprotein A-I; endoplasmic reticulum; endotoxin; hepatocyte nuclear factor 4α; high-density lipoprotein; liver X receptor; low-density lipoprotein receptor; low-density lipoprotein-cholesterol; nucleotide binding domain; polyunsaturated fatty acids; single nucleotide polymorphisms; thyroid hormone; very low-density lipoprotein-cholesterol