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Oxidation of LDL by nitric oxide and its modification by superoxides in macrophage and cell-free systems
1Institute of Biochemistry, College of Medicine, National Taiwan University, Taipei, Republic of China.
Abstract:
Oxidative modification of low density lipoproteins (LDL) can increase the atherogenicity of LDL. Here we demonstrate the potential role of nitric oxide (NO) in LDL modification. Dose-dependent alterations of LDL including an increase in electrophoretic mobility, generation of peroxides and degradation of apoprotein B occurred during incubation with NO. Sodium nitroprusside was also shown to increase the electromobility of LDL. Superoxide dismutase (SOD) and catalase did not affect this result. NO treatment also increases the negative charges on other lipoproteins. In addition, we have demonstrated that NO plays a protective role in macrophage or superoxide-induced LDL modification through its neutralizing action.