GPR182 is a lipoprotein receptor for dietary fat absorption

Area of Science:

• Lipid metabolism
• Lymphatic system physiology
• Molecular biology

Background:

• The lymphatic system is crucial for absorbing dietary fats, transporting chylomicrons from the intestine into circulation.
• The precise molecular mechanisms governing chylomicron entry into intestinal lymphatics remain largely unknown.

Purpose of the Study:

• To identify the molecular receptor responsible for mediating dietary fat absorption in the intestinal lymphatics.
• To elucidate the role of G protein-coupled receptor 182 (GPR182) in this process.

Main Methods:

• Utilized GPR182 knockout mouse models to investigate its function in lipid absorption.
• Employed monoclonal antibodies to block GPR182 activity in vivo.
• Analyzed chylomicron transport and lipid absorption efficiency.

Main Results:

• GPR182 knockout mice exhibited resistance to diet-induced obesity and impaired lipid absorption, with delayed growth.
• GPR182 was identified as a receptor on lymphatic endothelial cells (LECs) that binds and internalizes lipoproteins.
• Loss of GPR182 function prevented chylomicron entry into the small intestine's lacteal lumen.
• Monoclonal antibody blockade of GPR182 conferred protection against diet-induced obesity.

Conclusions:

• GPR182 is a critical lipoprotein receptor mediating dietary fat absorption by facilitating chylomicron entry into intestinal lymphatics.
• Targeting GPR182 presents a potential therapeutic strategy for managing obesity related to dietary fat intake.