© 1999 American Heart Association, Inc.
Cellular Biology |
Formation of Nitric Oxide–Derived Oxidants by Myeloperoxidase in Monocytes
Pathways for Monocyte-Mediated Protein Nitration and Lipid Peroxidation In Vivo
From the Department of Cell Biology (S.L.H., R.Z., Z.S., E.A.P., J.C.M., D.S., S.N.M., C.M., H.F.H., H.M.A.-S.), the Department of Cardiology (S.L.H.), and the Center for Surgery Research (A.C.), Cleveland Clinic Foundation, Cleveland, Ohio, and the Chemistry Department (S.L.H., W.W., Y.C., H.F.H.), Cleveland State University, Cleveland, Ohio.
Correspondence to Stanley L. Hazen, Cleveland Clinic Foundation, Lerner Research Institute, Department of Cell Biology, 9500 Euclid Ave, NC-10, Cleveland, OH 44195. E-mail hazens{at}ccf.org
Abstract—Protein nitration and lipid peroxidation are implicated in the pathogenesis of atherosclerosis; however, neither the cellular mediators nor the reaction pathways for these events in vivo are established. In the present study, we examined the chemical pathways available to monocytes for generating reactive nitrogen species and explored their potential contribution to the protein nitration and lipid peroxidation of biological targets. Isolated human monocytes activated in media containing physiologically relevant levels of nitrite (NO2-), a major end product of nitric oxide (•NO) metabolism, nitrate apolipoprotein B-100 tyrosine residues and initiate LDL lipid peroxidation. LDL nitration (assessed by gas chromatography–mass spectrometry quantification of nitrotyrosine) and lipid peroxidation (assessed by high-performance liquid chromatography with online tandem mass spectrometric quantification of distinct products) required cell activation and NO2-; occurred in the presence of metal chelators, superoxide dismutase (SOD), and scavengers of hypohalous acids; and was blocked by myeloperoxidase (MPO) inhibitors and catalase. Monocytes activated in the presence of the exogenous •NO generator PAPA NONOate (Z-[N-{3-aminopropyl}-N-{n-propyl}amino]diazen-1-ium-1,2-diolate) promoted LDL protein nitration and lipid peroxidation by a combination of pathways. At low rates of •NO flux, both protein nitration and lipid peroxidation were inhibited by catalase and peroxidase inhibitors but not SOD, suggesting a role for MPO. As rates of •NO flux increased, both nitrotyrosine formation and 9-hydroxy-10,12-octadecadienoate/9-hydroperoxy-10,12-octadecadienoic acid production by monocytes became insensitive to the presence of catalase or peroxidase inhibitors, but they were increasingly inhibited by SOD and methionine, suggesting a role for peroxynitrite. Collectively, these results demonstrate that monocytes use distinct mechanisms for generating •NO-derived oxidants, and they identify MPO as a source of nitrating intermediates in monocytes.
Key Words: nitrotyrosine • atherosclerosis • lipid peroxidation • nitric oxide
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