Regulation of cholesterol-7α-hydroxylase: BAREly missing a SHP

Original Article Differences in Expression of Cholesterol 7α-Hydroxylase between PHHC and Wistar Rats (cholesterol 7α-hydroxylase gene / gene expression / PHHC rats / hypercholesterolemia)

PHHC rats represent a suitable experimental model of polygenic hypercholesterolemia. It has been found that its metabolic defect is not related to alimentary cholesterol absorption and LDL clearance. We have tested possible changes in cholesterol clearance from the liver to bile acids by analysis of the expression of the cholesterol 7α-hydroxylase (cyp7A1) gene in PHHC (N = 20) and Wistar (cont...

Cholesterol 7α-hydroxylase protects the liver from inflammation and fibrosis by maintaining cholesterol homeostasis.

Cholesterol 7α-hydroxylase (CYP7A1) plays a critical role in control of bile acid and cholesterol homeostasis. Bile acids activate farnesoid X receptor (FXR) and Takeda G protein-coupled receptor 5 (TGR5) to regulate lipid, glucose, and energy metabolism. However, the role of bile acids in hepatic inflammation and fibrosis remains unclear. In this study, we showed that adenovirus-mediated overe...

A Novel Liver X Receptor Agonist Establishes Species Differences in the Regulation of Cholesterol 7α-Hydroxylase (CYP7a).

The liver X receptors, LXRalpha and LXRbeta, are members of the nuclear receptor superfamily. Originally identified as orphans, both receptor subtypes have since been shown to be activated by naturally occurring oxysterols. LXRalpha knockout mice fail to regulate cyp7a mRNA levels upon cholesterol feeding, implicating the role of this receptor in cholesterol homeostasis. LXR activation also ind...

Deficiency of cholesterol 7α‐hydroxylase in bile acid synthesis exacerbates alcohol‐induced liver injury in mice

Alcoholic fatty liver disease (AFLD) is a major risk factor for cirrhosis-associated liver diseases. Studies demonstrate that alcohol increases serum bile acids in humans and rodents. AFLD has been linked to cholestasis, although the physiologic relevance of increased bile acids in AFLD and the underlying mechanism of increasing the bile acid pool by alcohol feeding are still unclear. In this s...

Glucose stimulates cholesterol 7α-hydroxylase gene (CYP7A1) transcription in human hepatocytes