Plasma cholesteryl ester transfer protein is predominantly derived from Kupffer cells

Area of Science:

• Hepatology
• Immunology
• Lipid Metabolism

Background:

• Kupffer cells (KCs) play a key role in liver pathophysiology but are underexplored for liver disease diagnosis and treatment.
• Noninvasive diagnostic tests targeting KCs are lacking.

Purpose of the Study:

• To investigate if cholesteryl ester transfer protein (CETP) is primarily derived from KCs.
• To determine if CETP can serve as a predictor of KC content in the liver.

Main Methods:

• Microarray analysis of liver and adipose tissue from 93 obese subjects.
• Immunohistochemistry to confirm CETP and KC colocalization in human liver sections.
• Studies in transgenic mice with selective KC elimination or augmentation, and effects of lipid-lowering drugs.

Main Results:

• CETP expression was significantly higher in liver than adipose tissue and strongly correlated with KC markers.
• CETP mRNA and protein specifically colocalized with KCs in human liver.
• Eliminating KCs in CETP-transgenic mice reduced hepatic and plasma CETP, improving lipoprotein profiles.
• Augmenting KCs increased hepatic and plasma CETP.
• Lipid-lowering drugs reduced KC content and plasma CETP.

Conclusions:

• Plasma CETP is predominantly derived from hepatic Kupffer cells.
• Plasma CETP concentration serves as a reliable predictor of hepatic KC content in humans.