Summary.
3-Nitrotyrosine (3-NT) is a specific marker of protein nitration by peroxynitrite (ONOO−) produced from nitric oxide and superoxide. Increase in 3-NT containing protein (3-NT protein) was reported in brains from patients with some neurodegenerative disorders and aging. In this paper, intracellular localization of 3-NT protein was examined in dopaminergic SH-SY5Y cells using the selective antibody against protein-bound 3-NT. 3-NT protein was detected in plasma membrane/nucleus and mitochondria fractions, and interestingly in polypeptide composition of mitochondrial complex I. ONOO−-generating SIN-1 induced apoptotic cell death with concomitant increase in 3-NT protein and reduction in mitochondrial ATP synthesis. In addition, an inhibitor of proteasomes, carbobenzoxy-L-isoleucyl-γ-t-butyl-L-glutamyl-L-alanyl-L-leucinal, enhanced the effects of ONOO−. These results suggest that ONOO− may induce mitochondrial dysfunction and cell death in neurons through nitration of mitochondrial complex I subunits.
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Received March 12, 2001; accepted September 26, 2001
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Yamamoto, T., Maruyama, W., Kato, Y. et al. Selective nitration of mitochondrial complex I by peroxynitrite: involvement in mitochondria dysfunction and cell death of dopaminergic SH-SY5Y cells. J Neural Transm 109, 1–13 (2002). https://doi.org/10.1007/s702-002-8232-1
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DOI: https://doi.org/10.1007/s702-002-8232-1