Beginning to understand high-density lipoproteins.

Area of Science:

• Cardiovascular Science
• Lipid Metabolism
• Translational Medicine

Background:

• High-density lipoproteins (HDL) are traditionally linked to reduced cardiovascular disease (CVD) risk.
• Recent genetic studies and clinical trials challenge the established cardioprotective role of HDL.
• HDL cholesterol levels, commonly used as a surrogate marker, may not accurately reflect HDL's atheroprotective function.

Purpose of the Study:

• To reconcile the classic understanding of HDL's role in CVD risk with emerging contradictory evidence.
• To highlight the limitations of using HDL cholesterol as a sole indicator of HDL's beneficial effects.
• To discuss current and novel therapeutic strategies targeting HDL metabolism.

Main Methods:

• Review of genetic association studies.
• Analysis of data from randomized clinical trials.
• Examination of established and novel biomarkers for HDL function.

Main Results:

• HDL cholesterol levels do not consistently correlate with atheroprotective properties.
• The direct causal relationship between HDL levels and CVD risk reduction is questioned by recent data.
• More refined measures of HDL metabolism are necessary to assess its true impact on CVD.

Conclusions:

• The widely accepted role of HDL in preventing cardiovascular disease requires re-evaluation.
• Relying solely on HDL cholesterol levels for assessing cardiovascular risk is insufficient.
• Future research and therapies should focus on precise indicators of HDL functionality and metabolism.