| First Author | Astapova I | Year | 2014 |
| Journal | J Clin Invest | Volume | 124 |
| Issue | 5 | Pages | 1976-86 |
| PubMed ID | 24713658 | Mgi Jnum | J:212761 |
| Mgi Id | MGI:5582127 | Doi | 10.1172/JCI73419 |
| Citation | Astapova I, et al. (2014) Hepatic nuclear corepressor 1 regulates cholesterol absorption through a TRbeta1-governed pathway. J Clin Invest 124(5):1976-86 |
| abstractText | Transcriptional coregulators are important components of nuclear receptor (NR) signaling machinery and provide additional mechanisms for modulation of NR activity. Expression of a mutated nuclear corepressor 1 (NCoR1) that lacks 2 NR interacting domains (NCoRDeltaID) in the liver leads to elevated expression of genes regulated by thyroid hormone receptor (TR) and liver X receptor (LXR), both of which control hepatic cholesterol metabolism. Here, we demonstrate that expression of NCoRDeltaID in mouse liver improves dietary cholesterol tolerance in an LXRalpha-independent manner. NCoRDeltaID-associated cholesterol tolerance was primarily due to diminished intestinal cholesterol absorption as the result of changes in the composition and hydrophobicity of the bile salt pool. Alterations of the bile salt pool were mediated by increased expression of genes encoding the bile acid metabolism enzymes CYP27A1 and CYP3A11 as well as canalicular bile salt pump ABCB11. We have determined that these genes are regulated by thyroid hormone and that TRbeta1 is recruited to their regulatory regions. Together, these data indicate that interactions between NCoR1 and TR control a specific pathway involved in regulation of cholesterol metabolism and clearance. |
