[Changes in biological functions of high-density lipoprotein after abnormal modification]

Area of Science:

• Cardiovascular Science
• Lipid Metabolism
• Immunology

Background:

• High-density lipoprotein (HDL) plays a crucial role in protecting against atherosclerosis (AS) through reverse cholesterol transport (RCT).
• HDL possesses anti-inflammatory, antioxidant, and endothelial function-restoring properties.
• Systemic inflammation or metabolic disorders can lead to abnormal HDL modification, resulting in dysfunctional HDL.

Purpose of the Study:

• To elucidate the compositional and functional alterations of dysfunctional HDL.
• To understand the pathogenic mechanisms associated with dysfunctional HDL.

Main Methods:

• Analysis of HDL composition, focusing on apolipoproteins, lipids, and functional proteins.
• Assessment of HDL's biological functions, including anti-inflammatory and anti-atherosclerotic properties.
• Comparison of HDL characteristics under normal versus inflammatory or metabolic disorder conditions.

Main Results:

• Dysfunctional HDL exhibits a loss of anti-inflammatory factors like apolipoprotein A-I (apoA-I), paraoxonase (PON), and platelet activating factor acetylhydrolase (PAF-AH).
• Dysfunctional HDL gains pro-inflammatory factors, including serum amyloid A (SAA) and triglyceride (TG), along with oxidative lipids.
• These compositional changes lead to impaired HDL functions, contributing to atherosclerosis pathogenesis.

Conclusions:

• Understanding the specific changes in dysfunctional HDL composition and function is critical.
• Elucidating these alterations may reveal novel therapeutic targets for atherosclerosis and related metabolic disorders.