Aminoacetone induces iron-mediated oxidative damage to isolated rat liver mitochondria

被引:20
作者
Dutra, F [1 ]
Bechara, EJH [1 ]
机构
[1] Univ Sao Paulo, Inst Quim, Dept Bioquim, BR-05508900 Sao Paulo, Brazil
关键词
aminoacetone; methylglyoxal; ferritin; reactive oxygen species; oxidative stress; mitochondrial swelling; diabetes;
D O I
10.1016/j.abb.2004.06.029
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Aminoacetone (AA) is a threonine metabolite accumulated in threoninemia, cri-du-chat, and diabetes, where it contributes toward the formation of cytotoxic and genotoxic methylglyoxal (MG). Oxyradicals yielded from iron-catalyzed AA aerobic oxidation to MG are shown here to promote Ca2+-mediated mitochondrial membrane permeabilization in an AA dose-dependent way. The inhibitory effect of added EGTA, cyclosporin A, Mg2+, and DTT observed in this study suggests the formation of transition pores in the inner mitochondrial membrane by AA, associated with thiol protein aggregation. That the mitochondrial iron pool plays a coadjutant role in the transition of mitochondrial permeability is indicated by the dramatic inhibitory effect of added o-phenanthroline. Iron released from ferritin by AA oxidation products-superoxide anion and AA enolyl radicals-is shown to act as an alternative source of ferrous iron, intensifying the mitochondrial damage. These findings may contribute to clarify the role of accumulated AA and iron overload in the mitochondrial oxidative damage reportedly occurring in diabetes mellitus. (C) 2004 Published by Elsevier Inc.
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页码:284 / 289
页数:6
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