Adenine nucleotide translocator promotes oxidative phosphorylation and mild uncoupling in mitochondria after dexamethasone treatment. Arvier, M., Lagoutte, L., Johnson, G., Dumas, J., Sion, B., Grizard, G., Malthièry, Y., Simard, G., & Ritz, P. 293(5):E1320–4, 11, 2007.
Adenine nucleotide translocator promotes oxidative phosphorylation and mild uncoupling in mitochondria after dexamethasone treatment. [link]Paper  doi  abstract   bibtex   
The composition of the mitochondrial inner membrane and uncoupling protein [such as adenine nucleotide translocator (ANT)] contents are the main factors involved in the energy-wasting proton leak. This leak is increased by glucocorticoid treatment under nonphosphorylating conditions. The aim of this study was to investigate mechanisms involved in glucocorticoid-induced proton leak and to evaluate the consequences in more physiological conditions (between states 4 and 3). Isolated liver mitochondria, obtained from dexamethasone-treated rats (1.5 mg.kg(-1).day(-1)), were studied by polarography, Western blotting, and high-performance thin-layer chromatography. We confirmed that dexamethasone treatment in rats induces a proton leak in state 4 that is associated with an increased ANT content, although without any change in membrane surface or lipid composition. Between states 4 and 3, dexamethasone stimulates ATP synthesis by increasing both the mitochondrial ANT and F1-F0 ATP synthase content. In conclusion, dexamethasone increases mitochondrial capacity to generate ATP by modifying ANT and ATP synthase. The side effect is an increased leak in nonphosphorylating conditions.
@article{Arvier-2007-ID5,
  title     = {Adenine nucleotide translocator promotes oxidative phosphorylation and mild
               uncoupling in mitochondria after dexamethasone treatment.},
  abstract  = {The composition of the mitochondrial inner membrane and uncoupling protein
               [such as adenine nucleotide translocator ({ANT})] contents are the main
               factors involved in the energy-wasting proton leak. This leak is increased
               by glucocorticoid treatment under nonphosphorylating conditions. The aim of
               this study was to investigate mechanisms involved in glucocorticoid-induced
               proton leak and to evaluate the consequences in more physiological
               conditions (between states 4 and 3). Isolated liver mitochondria, obtained
               from dexamethasone-treated rats (1.5 mg.kg(-1).day(-1)), were studied by
               polarography, Western blotting, and high-performance thin-layer
               chromatography. We confirmed that dexamethasone treatment in rats induces a
               proton leak in state 4 that is associated with an increased {ANT} content,
               although without any change in membrane surface or lipid composition.
               Between states 4 and 3, dexamethasone stimulates {ATP} synthesis by
               increasing both the mitochondrial {ANT} and F1-F0 {ATP} synthase content.
               In conclusion, dexamethasone increases mitochondrial capacity to generate
               {ATP} by modifying {ANT} and {ATP} synthase. The side effect is an
               increased leak in nonphosphorylating conditions.},
  author    = {Arvier, Matthieu and Lagoutte, Laëtitia and Johnson, Gyasi and Dumas,
               Jean-François and Sion, Benoit and Grizard, Genevieve and Malthièry, Yves
               and Simard, Gilles and Ritz, Patrick},
  volume    = {293},
  number    = {5},
  pages     = {E1320--4},
  year      = {2007},
  month     = {11},
  url       = {http://www.pubmed.org/17698987},
  pmid      = {17698987},
  doi       = {10.1152/ajpendo.00138.2007},
  keywords  = {Animals, Mitochondria, Liver, Adenine Nucleotide Translocator 1, Adenosine
               Triphosphate, Cardiolipins, Citrate (si)-Synthase, Dexamethasone,
               Ethanolamines, Glucocorticoids, Male, Membrane Potential, Mitochondrial,
               Mitochondrial Proton-Translocating {ATP}ases, Oxidative Phosphorylation,
               Oxygen Consumption, Phosphatidylcholines, Polarography, Random Allocation,
               Rats, Rats, Sprague-Dawley},
  file      = {FULLTEXT:pdfs/000/000/000000005.pdf:PDF}
}

Downloads: 0