A Novel Function of Lipoprotein(a) as a Preferential Carrier of Oxidized Phospholipids in Human Plasma

Why is lipoprotein(a) so harmful to arteries? This laboratory study supplied a central piece of the mechanistic answer, helping explain how an inherited particle drives inflammation in the vessel wall.

Working with human plasma, the investigators showed that Lp(a) is the body’s preferential carrier of oxidized phospholipids — inflammatory, pro-atherogenic molecules. More than 85 percent of these oxidized phospholipids traveled with Lp(a) rather than with ordinary LDL, and the researchers demonstrated that oxidized LDL actively hands off these molecules to Lp(a), even in a simple buffer. Lp(a), in other words, acts as a magnet for some of the most damaging cargo in the bloodstream.

This reframed Lp(a) from a passive marker into an active vehicle of arterial injury. It is the kind of bench science that gives epidemiology its teeth — explaining why the genetic and population data linking Lp(a) to heart attack, stroke, and valve disease make biological sense.

We rate the evidence moderate-to-strong for a mechanistic study. The sample is small and the work is in vitro, but it is rigorous and has been highly influential in shaping how the field understands Lp(a)‘s pathology.