FAT/CD36 regulates PEPCK expression in adipose tissue

Area of Science:

• Metabolism
• Molecular Biology
• Endocrinology

Background:

• Fatty acid translocase (FAT)/CD36 is known to facilitate fatty acid uptake and regulate adipocyte lipolysis.
• Its role in fatty acid reesterification and gene expression control in adipocytes is less understood.

Purpose of the Study:

• To investigate the role of FAT/CD36 in regulating fatty acid reesterification in adipose tissue.
• To determine if FAT/CD36 influences the expression of enzymes involved in fatty acid reesterification, such as PEPCK.

Main Methods:

• Analysis of adipose tissue from FAT/CD36 knockout mice.
• Measurement of glycerol and fatty acid release, lipolysis rates, and fatty acid reesterification.
• Assessment of mRNA and protein expression of PEPCK.
• In vitro experiments using lipase inhibitors and CD36 agonists on cultured adipose tissue.

Main Results:

• FAT/CD36 knockout mice showed reduced glycerol and fatty acid release, decreased lipolysis, and lower rates of fatty acid reesterification.
• PEPCK mRNA expression and protein content were reduced in FAT/CD36 knockout adipose tissue.
• Lipase inhibition decreased PEPCK mRNA expression, while CD36 agonist treatment increased it, independent of lipolysis.

Conclusions:

• FAT/CD36 plays a significant role in regulating fatty acid reesterification in adipose tissue.
• The regulation of PEPCK by FAT/CD36 may be linked to its effects on lipolysis.
• These findings highlight a novel function of FAT/CD36 in metabolic regulation within adipocytes.