Which lipoprotein is the most atherogenic?

• A. LDL
• B. VLDL
• C. HDL
• D. Chylomicrons

Answer: (A)

Atherogenicity depends on how much cholesterol a lipoprotein delivers to the arterial wall and how easily that cholesterol becomes trapped and modified to provoke inflammation. Low-density lipoprotein carries a high cholesterol load and can cross the endothelial layer to enter the intima. There it is prone to oxidative modification, and macrophages take up oxidized LDL via scavenger receptors, leading to uncontrolled cholesterol buildup and foam cell formation—early steps of plaque development. In contrast, HDL helps remove cholesterol from plaques, and chylomicrons and VLDL mainly transport triglycerides and are cleared quickly, contributing less to arterial wall cholesterol deposition. Small dense LDL particles are especially atherogenic due to greater oxidation and easier penetration, reinforcing why LDL overall is the primary culprit.