Journal
FREE RADICAL BIOLOGY AND MEDICINE
Volume 67, Issue -, Pages 278-284Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.freeradbiomed.2013.10.816
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Funding
- NHLBI NIH HHS [HL063119, R01 HL063119] Funding Source: Medline
- NIBIB NIH HHS [P41 EB001980] Funding Source: Medline
- NINDS NIH HHS [NS039958, R01 NS039958] Funding Source: Medline
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Recently, DJ. Hall eta!, reported that ethidium (E+) is formed as a major product of hydroethidine (HE) or dihydroethidium reaction with superoxide (O-2(center dot-)) in intact animals with low tissue oxygen levels U. Cereb. Blood Flow Metab. 32:23-32, 2012). The authors concluded that measurement of E+ is an indicator of O-2(center dot-) formation in intact brains of animals. This finding is in stark contrast to previous reports using in vitro systems showing that 2-hydroxyethidium, not ethidium, is formed from the reaction between O-2(center dot-) and HE. Published in vivo results support the in vitro findings. In this study, we performed additional experiments in which HE oxidation products were monitored under different fluxes of O-2(center dot-). Results from these experiments further reaffirm our earlier findings (H. Zhao et al., Free Radic. Biol. Med. 34:1359, 2003). We conclude that whether in vitro or in vivo, E+ measured by HPLC or by fluorescence lifetime imaging is not a diagnostic marker product for O-2(center dot-) reaction with HE. (C) 2013 Published by Elsevier Inc.
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