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Am J Physiol Renal Physiol 283: F52-F59, 2002. First published January 29, 2002; doi:10.1152/ajprenal.00302.2001
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Vol. 283, Issue 1, F52-F59, July 2002

Alterations in renal mitochondrial respiration in response to the reactive oxoaldehyde methylglyoxal

Mariana G. Rosca1, Vincent M. Monnier2, Luke I. Szweda3, and Miriam F. Weiss4

1 University of Medicine and Pharmacy of Iasi, Iasi, Romania 6600; and 2 Institute of Pathology and Department of Biochemistry, 3 Department of Physiology, and 4 Department of Medicine, Case Western Reserve University, Cleveland, Ohio 44106

Chronic hyperglycemia has been linked to alterations in mitochondrial function, suggesting an important role in the pathophysiology of the complications of diabetes mellitus. In the diabetic kidney, ultrastructural changes in mitochondria are associated with impaired tubular function. The goal of this study was to determine if methylglyoxal (MGO), a dicarbonyl compound reaching high levels in hyperglycemic conditions, has direct toxicity for renal mitochondria. Intact mitochondria isolated from the renal cortex of rats were incubated with MGO to determine 1) its effect on mitochondrial respiration, 2) the conditions under which MGO exerts these effects, and 3) the potential mitochondrial targets of MGO influence. This study demonstrates that MGO has an inhibitory effect on both the tricarboxylic acid cycle and the electron respiratory chain. The modifications appear to be specific to certain mitochondrial proteins. Alterations of these proteins lead to disturbances in mitochondria that may play an important role in renal cellular toxicity and in the development of diabetic nephropathy.

dicarbonyl; diabetic nephropathy; mitochondria


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