Low density lipoproteins (LDL), isolated by ultracentrifugal flotation, were oxidized (LDL(OXID)) slowly during dialysis against 0.15 M NaCl and subsequent incubation in 96% air-4% CO2 at 37°C. Butylated hydroxytoluene prevented LDL oxidation. LDL preparations from different sera were oxidized at different rates and the degree of lipid peroxidation was controlled by varying the incubation time. Mild oxidation did not alter the electrophoretic mobility of the LDL(OXID) preparation. LDL(OXID) contained lipid peroxides in neutral lipids, had increased amounts of lysophosphatidylcholine, and contained a number of complex oxidation products that were generated from the oxidation of free fatty acids. These oxidation products included large amounts of soluble material that cross-reacted with antibodies to PGE2 but not 6-keto-PGF(1α). The amount of cross-reacting material was proportional to the degree of lipid peroxidation. Cross-reacting material in LDL(OXID) preparations was evidently formed from the oxidation of free fatty acids released from LDL, since cross-reacting material was also formed when a synthetic fat emulsion was oxidized in the presence of free arachidonic acid.
|Original language||English (US)|
|Number of pages||8|
|Journal||Journal of Lipid Research|
|State||Published - 1989|
ASJC Scopus subject areas
- Cell Biology