Tumor necrosis factor-alpha in low doses preactivates and activates macrophages by increasing their ability to produce reactive oxygen species and oxidize low-density lipoproteins: protective effect of antioxidants.

Tumor necrosis factor-alpha in low doses activated rat peritoneal macrophages and intensified production of reactive oxygen species (zymosan-depended chemiluminescence). Single or 2-fold incubation with tumor necrosis factor-a activated and preactivated human blood macrophages and promoted oxidative modification of low-density lipoproteins (increased their mobility in agarose gel). Antioxidants (potassium phenosan, probucol, and desferal) suppressed oxidative modification of low-density lipoproteins induced by nonactivated, preactivated, and activated macrophages.