Rabbit anti-Human HOCL Oxidized Low Density Lipoprotein polyclonal antibody for ELISA, IHC PFA fixed). When too much LDL cholesterol circulates in the blood, it can slowly build up in the inner walls of the arteries that feed the heart and brain. Together with other substances it can form plaque, a thick, hard deposit that can clog those arteries. This condition is known as atherosclerosis. Oxidized lipoproteins are formed by free radical damage to lipids that accumulate in macrophages and smooth muscle cells causing foam cell formation, an initial step in the disease.