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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Xia, Y. Zweier, J. L. |
| Description | Author Affiliation: Xia Y ( Molecular and Cellular Biophysics Laboratories, Department of Medicine, Division of Cardiology, The Johns Hopkins University School of Medicine, Johns Hopkins Bayview Medical Center, Baltimore, MD 21224, USA.); |
| Abstract | Superoxide (O-2) and nitric oxide (NO) act to kill invading microbes in phagocytes. In macrophages NO is synthesized by inducible nitric oxide synthase (iNOS, NOS 2) from L-arginine (L-Arg) and oxygen; however, O-2 was thought to be produced mainly by NADPH oxidase. Electron paramagnetic resonance (EPR) spin trapping experiments performed in murine macrophages demonstrate a novel pathway of O-2 generation. It was observed that depletion of cytosolic L-Arg triggers O-2 generation from iNOS. This iNOS-mediated O-2 generation was blocked by the NOS inhibitor N-nitro-L-arginine methyl ester or by L-Arg, but not by the noninhibitory enantiomer N-nitro-D-arginine methyl ester. In L-Arg-depleted macrophages iNOS generates both O-2 and NO that interact to form the potent oxidant peroxynitrite (ONOO-), which was detected by luminol luminescence and whose formation was blocked by superoxide dismutase, urate, or L-Arg. This iNOS-derived ONOO- resulted in nitrotyrosine formation, and this was inhibited by iNOS blockade. iNOS-mediated O-2 and ONOO- increased the antibacterial activity of macrophages. Thus, with reduced L-Arg availability iNOS produces O-2 and ONOO- that modulate macrophage function. Due to the existence of L-Arg depletion in inflammation, iNOS-mediated O-2 and ONOO- may occur and contribute to cytostatic/cytotoxic actions of macrophages. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 13 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-07-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Macrophages Metabolism Nitrates Nitric Oxide Synthase Superoxides Animals Cell Line Chromatography, High Pressure Liquid Electron Spin Resonance Spectroscopy Mice Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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