Oxidized LDL: diversity, patterns of recognition, and pathophysiology

Area of Science:

• Biochemistry
• Immunology
• Cardiovascular Research

Background:

• Oxidative modification of low-density lipoprotein (LDL) is a key factor in atherosclerosis.
• Oxidized LDL (OxLDL) is heterogeneous, with varying degrees of oxidation and bioactive components.
• This heterogeneity contributes to variable reported effects of OxLDL in scientific literature.

Purpose of the Study:

• To review the subclasses and molecular composition of OxLDL, including minimally modified LDL.
• To describe receptors recognizing various OxLDL species and their recognition mechanisms.
• To discuss contentious issues regarding OxLDL in vivo and its role in atherogenesis and other diseases.

Main Methods:

• Literature review of OxLDL subclasses and receptor interactions.
• Analysis of mechanisms for OxLDL recognition by specific receptors.
• Discussion of in vivo OxLDL properties and its role in various pathologies.

Main Results:

• OxLDL exhibits significant heterogeneity, impacting its biological effects.
• Multiple receptors bind to distinct OxLDL species via specific mechanisms.
• OxLDL's role in atherogenesis, foam cell formation, and cholesterol homeostasis is complex and debated.
• OxLDL possesses both pro- and anti-inflammatory properties.

Conclusions:

• The heterogeneity of OxLDL is a critical factor in understanding its pro-atherogenic effects.
• Specific receptors mediate the cellular uptake and response to different OxLDL forms.
• Oxidized LDL plays a multifaceted role in atherosclerosis and is implicated in other conditions like diabetes and autoimmune diseases.