The peroxisome proliferator-activated receptor α (PPARα) regulates bile acid biosynthesis

被引:138
作者
Hunt, MC
Yang, YZ
Eggertsen, G
Carneheim, CM
Gåfvels, M
Einarsson, C
Alexson, SEH [1 ]
机构
[1] Huddinge Univ Hosp, Karolinska Inst, Div Clin Chem, Dept Med Lab Sci & Technol, S-14186 Huddinge, Sweden
[2] Pharmacia & Upjohn AB, Plasma Prod R&D, S-11287 Stockholm, Sweden
[3] Huddinge Univ Hosp, Karolinska Inst, Dept Med, Div Gastroenterol & Hepatol, S-14186 Huddinge, Sweden
关键词
D O I
10.1074/jbc.M002782200
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Fibrates are a group of hypolipidemic agents that efficiently lower serum triglyceride levels by affecting the expression of many genes involved in lipid metabolism. These effects are exerted via the peroxisome proliferator-activated receptor alpha (PPAR alpha). In addition, fibrates also lower serum cholesterol levels, suggesting a possible link between the PPAR alpha and cholesterol metabolism. Bile acid formation represents an important pathway for elimination of cholesterol, and the sterol 12 alpha-hydroxylase is a branch-point enzyme in the bile acid biosynthetic pathway, which determines the ratio of cholic acid to chenodeoxycholic acid. Treatment of mice for 1 week with the peroxisome proliferator WY-14,643 or fasting for 24 h both induced the sterol 12 alpha-hydroxylase mRNA in liver. Using the PPAR alpha knockout mouse model, we show that the induction by both treatments was dependent on the PPAR alpha. A reporter plasmid containing a putative peroxisome proliferator-response element (PPRE) identified in the rat sterol 12 alpha-hydroxylase promoter region was activated by treatment with WY-14,643 in HepG2 cells, being dependent on co-transfection with a PPAR alpha expression plasmid, The rat 12 alpha-hydroxylase PPRE bound in vitro translated PPAR alpha and retinoid X receptor alpha, albeit weakly, in electrophoretic mobility shift assay, Treatment of wild-type mice with WY-14,643 for 1 week resulted in an increased relative amount of cholic acid, an effect that was abolished in the PPAR alpha null mice, verifying the functionality of the PPRE in vivo.
引用
收藏
页码:28947 / 28953
页数:7
相关论文
共 31 条
[1]   Thyroid hormone suppresses hepatic sterol 12α-hydroxylase (CYP8B1) activity and messenger ribonucleic acid in rat liver:: Failure to define known thyroid hormone response elements in the gene [J].
Andersson, U ;
Yang, YZ ;
Björkhem, I ;
Einarsson, C ;
Eggertsen, G ;
Gåfvels, M .
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR AND CELL BIOLOGY OF LIPIDS, 1999, 1438 (02) :167-174
[2]   EFFECTS OF CLOFIBRATE ON SOME MICROSOMAL HYDROXYLATIONS INVOLVED IN FORMATION AND METABOLISM OF BILE-ACIDS IN RAT-LIVER [J].
ANGELIN, B ;
BJORKHEM, I ;
EINARSSON, K .
BIOCHEMICAL JOURNAL, 1976, 156 (02) :445-448
[3]   Altered constitutive expression of fatty acid-metabolizing enzymes in mice lacking the peroxisome proliferator-activated receptor α (PPARα) [J].
Aoyama, T ;
Peters, JM ;
Iritani, N ;
Nakajima, T ;
Furihata, K ;
Hashimoto, T ;
Gonzalez, FJ .
JOURNAL OF BIOLOGICAL CHEMISTRY, 1998, 273 (10) :5678-5684
[4]   α1-fetoprotein transcription factor is required for the expression of sterol 12α-hydroxylase, the specific enzyme for cholic acid synthesis -: Potential role in the bile acid-mediated regulation of gene transcription [J].
del Castillo-Olivares, A ;
Gil, G .
JOURNAL OF BIOLOGICAL CHEMISTRY, 2000, 275 (23) :17793-17799
[5]   Molecular cloning and expression of rabbit sterol 12 alpha-hydroxylase [J].
Eggertsen, G ;
Olin, M ;
Andersson, U ;
Ishida, H ;
Kubota, S ;
Hellman, U ;
KyuIchiro, O ;
Bjorkhem, I .
JOURNAL OF BIOLOGICAL CHEMISTRY, 1996, 271 (50) :32269-32275
[6]   Hypolipidemic drugs, polyunsaturated fatty acids, and eicosanoids are ligands for peroxisome proliferator-activated receptors alpha and delta [J].
Forman, BM ;
Chen, J ;
Evans, RM .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1997, 94 (09) :4312-4317
[7]   Structure and chromosomal assignment of the sterol 12α-hydroxylase gene (CYP8B1) in human and mouse:: Eukaryotic cytochrome P-450 gene devoid of introns [J].
Gåfvels, M ;
Olin, M ;
Chowdhary, BP ;
Raudsepp, T ;
Andersson, U ;
Persson, B ;
Jansson, M ;
Björkhem, I ;
Eggertsen, G .
GENOMICS, 1999, 56 (02) :184-196
[8]   Identification of a bile acid-responsive element in the human ileal bile acid-binding protein gene -: Involvement of the farnesoid X receptor/9-cis-retinoic acid receptor heterodimer [J].
Grober, J ;
Zaghini, I ;
Fujii, H ;
Jones, SA ;
Kliewer, SA ;
Willson, TM ;
Ono, T ;
Besnard, P .
JOURNAL OF BIOLOGICAL CHEMISTRY, 1999, 274 (42) :29749-29754
[9]  
GRUNDY SM, 1972, J LIPID RES, V13, P531
[10]  
Hunt MC, 2000, J LIPID RES, V41, P814