CREBH Systemically Regulates Lipid Metabolism by Modulating and Integrating Cellular Functions

Area of Science:

• Molecular Biology
• Metabolic Diseases
• Genetics

Background:

• Cyclic AMP-responsive element-binding protein H (CREBH) is a key transcriptional factor regulating lipid metabolism.
• CREBH activity is controlled transcriptionally and posttranslationally, influenced by circadian rhythms.
• Its expression in the liver and small intestine suggests a role in enterohepatic lipid regulation.

Purpose of the Study:

• To review the crucial role of CREBH in systemic lipid homeostasis.
• To highlight CREBH's function in integrating cellular lipid metabolism processes.
• To understand the impact of CREBH deficiency on lipid-related diseases.

Main Methods:

• Review of existing literature on CREBH function and regulation.
• Analysis of CREBH knockout mouse models (liver- and intestine-specific).
• Examination of CREBH's role in triglyceride metabolism, fatty acid oxidation, lipophagy, lipogenesis, and apolipoprotein expression.

Main Results:

• CREBH governs hepatic triglyceride metabolism, influencing fatty acid oxidation, lipophagy, and apolipoprotein expression.
• Intestinal CREBH downregulates dietary lipid absorption.
• CREBH deficiency in mice results in hypertriglyceridemia, fatty liver, and exacerbated atherosclerosis, particularly when crossed with LDL receptor KO mice.

Conclusions:

• CREBH plays a critical role in maintaining systemic lipid homeostasis through enterohepatic interactions.
• CREBH integrates diverse cellular functions related to lipid metabolism.
• Dysregulation of CREBH contributes to metabolic disorders like hypertriglyceridemia, fatty liver, and atherosclerosis.