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Mitochondrial energy metabolism in a model of undernutrition induced by dexamethasone

Published online by Cambridge University Press:  09 March 2007

Jean-François Dumas ,
Gilles Simard ,
Damien Roussel ,
Olivier Douay ,
Françoise Foussard ,
Yves Malthiery  and
Patrick Ritz
Jean-François Dumas
Affiliation:
Medecine B, CHU, F-49033 ANGERS Cedex 01, France
Gilles Simard
Affiliation:
Medecine B, CHU, F-49033 ANGERS Cedex 01, France
Damien Roussel
Affiliation:
Medecine B, CHU, F-49033 ANGERS Cedex 01, France
Olivier Douay
Affiliation:
Medecine B, CHU, F-49033 ANGERS Cedex 01, France
Françoise Foussard
Affiliation:
Medecine B, CHU, F-49033 ANGERS Cedex 01, France
Yves Malthiery
Affiliation:
Medecine B, CHU, F-49033 ANGERS Cedex 01, France
Patrick Ritz*
Affiliation:
Medecine B, CHU, F-49033 ANGERS Cedex 01, France
*
*Corresponding author: Professor Patrick Ritz, fax +33 241354969, email [email protected]
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Abstract

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The present investigation was undertaken to evaluate whether mitochondrial energy metabolism is altered in a model of malnutrition induced by dexamethasone (DEX) treatment (1·5mg/kg per d for 5d). The gastrocnemius and liver mitochondria were isolated from DEX-treated, pair-fed (PF) and control (CON) rats. Body weight was reduced significantly more in the DEX-treated group (−16%) than in the PF group (−9%). DEX treatment increased liver mass (+59% v. PF, +23% v. CON) and decreased gastrocnemius mass. Moreover, in DEX-treated rats, liver mitochondria had an increased rate of non-phosphorylative O2 consumption with all substrates (approximately +42%). There was no difference in enzymatic complex activities in liver mitochondria between rat groups. Collectively, these results suggest an increased proton leak and/or redox slipping in the liver mitochondria of DEX-treated rats. In addition, DEX decreased the thermodynamic coupling and efficiency of oxidative phosphorylation. We therefore suggest that this increase in the proton leak and/or redox slip in the liver is responsible for the decrease in the thermodynamic efficiency of energy conversion. In contrast, none of the variables of energy metabolism determined in gastrocnemius mitochondria was altered by DEX treatment. Therefore, it appears that DEX specifically affects mitochondrial energy metabolism in the liver.

Keywords

GlucocorticoidMitochondrionOxidative phosphorylationRespiratory chain complexes
Type
Research Article
Information
British Journal of Nutrition , Volume 90 , Issue 5 , November 2003 , pp. 969 - 977
Copyright
Copyright © The Nutrition Society 2003

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