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Temporal changes in mitochondrial activities of rat heart after a single injection of iron, including increased complex II activity

  • Kim, Mi-Sun (Division of Life Science, College of Natural Sciences, Sookmyung Women's University) ;
  • Song, Eun-Sook (Division of Life Science, College of Natural Sciences, Sookmyung Women's University)
  • Received : 2009.12.26
  • Published : 2010.06.30

Abstract

Male rats were given a single injection of iron, and temporal changes in iron content and iron-induced effects were examined in heart cellular fractions. Over a period of 72 h, the contents of total and labile iron, reactive oxygen species, and NO in tissue homogenate, nuclear debris, and postmitochondrial fractions were mostly constant, but in mitochondria they continuously increased. An abrupt decrease in membrane potential and NAD(P)H at 12 h was also found in mitochondria. The respiratory control ratio was reduced slowly with a slight recovery at 72 h, suggesting uncoupling by iron.While the ATP content of tissue homogenate decreased steadily until 72 h, it showed a prominent increase in mitochondria at 12 h. Total iron and calcium concentration also progressively increased in mitochondria over 72 h. Enzyme activity of the oxidative phosphorylation system was significantly altered by iron injection: activities of complexes I, III, and IV were reduced considerably, but complex II activity and the ATPase activity of complex V were enhanced. A reversal of activity in complexes I and II at 12 h suggested reverse electron transfer due to iron overload. These results support the argument that mitochondrial activities including oxidative phosphorylation are modulated by excessive iron.

Acknowledgement

Supported by : Korea Science and Engineering Foundation (KOSEF)

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