Speciated High-Density Lipoprotein Biogenesis and Functionality

Area of Science:

• Biochemistry
• Cardiovascular Medicine
• Lipid Metabolism

Background:

• Plasma high-density lipoprotein cholesterol (HDL-C) is a recognized negative risk factor for atherosclerotic cardiovascular disease (CVD).
• Despite the established link, therapeutic strategies aimed at increasing HDL-C levels have largely failed to demonstrate cardioprotective benefits.
• Current research emphasizes HDL functionality and quality over mere quantity in its atheroprotective role.

Purpose of the Study:

• To review and provide a perspective on speciated high-density lipoprotein (HDL) biogenesis.
• To explore the factors influencing HDL function beyond cholesterol concentration, focusing on stability and composition.
• To discuss the implications of HDL heterogeneity in health and disease.

Main Methods:

• Literature review and synthesis of current knowledge on HDL biogenesis, composition, and function.
• Analysis of factors such as HDL subclass stability, apolipoprotein content (apo AI, apo AII), and other associated proteins.
• Discussion of the role of specific HDL species, including those with intact signal peptides, in cholesterol transport and beyond.

Main Results:

• HDL function, particularly its role in reverse cholesterol transport, is impaired in patients with CVD, independent of HDL-C levels.
• HDL stability and composition, including the presence and ratio of apolipoproteins (apo AI, apo AII) and other proteins, are key determinants of HDL function.
• Heterogeneity exists within HDL particles, with distinct subclasses and species exhibiting unique properties and potential roles in health and disease.

Conclusions:

• The focus on HDL quality, including its functional capacity, stability, and specific composition, is more relevant for cardioprotection than HDL-C quantity alone.
• Understanding the biogenesis and heterogeneity of specific HDL species is critical for elucidating their precise roles in cardiovascular health and disease.
• Further research into the functional implications of diverse HDL subclasses and their associated proteins may reveal novel therapeutic targets for CVD.