Interactions of nitric oxide and peroxynitrite with low-density lipoprotein.
Nitric oxide (*NO) is a free radical species that diffuses and concentrates in the hydrophobic core of low-density lipoprotein (LDL) to serve as a potent inhibitor of lipid oxidation processes. Peroxynitrite (PN), the product of the diffusion-limited reaction between *NO and superoxide (O2*-) represents a relevant mediator of oxidative modifications in LDL. The focus of this review is the analysis of interactions between *NO and PN and its secondary reactions with oxygen radicals on LDL oxidation, which are relevant in the development of the early steps as well as progression of atherosclerosis. We propose that the balance between rates of PN and *NO production, which greatly depends on oxidative stress processes within the vascular wall, will critically determine the final extent of oxidative LDL modifications leading or not to scavenger receptor-mediated LDL uptake and foam cell formation.
Rubbo
Homero
H
Departamento de Bioquímica, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay.
Trostchansky
Andrés
A
Botti
Horacio
H
Batthyány
Carlos
C
D000818:Animals; D006801:Humans; D008077:Lipoproteins, LDL / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism*; D030421:Peroxynitrous Acid / Q000378:metabolism*; D013481:Superoxides / Q000378:metabolism
D008077:Lipoproteins, LDL; C099252:oxidized low density lipoprotein; D013481:Superoxides; D030421:Peroxynitrous Acid; D009569:Nitric Oxide