Abstract
Transporters present in the epithelium of the small intestine determine the efficiency by which dietary and biliary cholesterol are taken up into the body and thus control whole-body cholesterol balance. Niemann-Pick C1 Like Protein 1 (Npc1l1) transports cholesterol into the enterocyte, whereas ATP-binding cassette transporters Abca1 and Abcg5/Abcg8 are presumed to be involved in cholesterol efflux from the enterocyte toward plasma HDL and back into the intestinal lumen, respectively. Abca1, Abcg5, and Abcg8 are well-established liver X receptor (LXR) target genes. We examined the effects of a high-fat diet on expression and function of cholesterol transporters in the small intestine in mice. Npc1l1, Abca1, Abcg5, and Abcg8 were all downregulated after 2, 4, and 8 wk on a cholesterol-free, high-fat diet. The high-fat diet did not affect biliary cholesterol secretion but diminished fractional cholesterol absorption from 61 to 42% (P
Original language | English |
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Pages (from-to) | G1171-1180 |
Number of pages | 10 |
Journal | AJP: Gastrointestinal and Liver Physiology |
Volume | 294 |
Issue number | 5 |
DOIs | |
Publication status | Published - May 2008 |
Keywords
- ATP Binding Cassette Transporter 1
- ATP-Binding Cassette Transporters
- Animals
- Bile Acids and Salts
- Cholesterol
- DNA-Binding Proteins
- Dietary Fats
- Epithelial Cells
- Feces
- Gene Expression Regulation
- Hydroxycholesterols
- Hydroxymethylglutaryl CoA Reductases
- Intestinal Absorption
- Intestine, Small
- Lipoproteins
- Male
- Membrane Transport Proteins
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Models, Biological
- Oligonucleotide Array Sequence Analysis
- Orphan Nuclear Receptors
- Receptors, Cytoplasmic and Nuclear
- Reverse Transcriptase Polymerase Chain Reaction
- Triglycerides