scholarly journals Reactive oxygen species production by flavin dehydrogenases of the mitochondrial respiratory chain

2012 ◽  
Vol 1817 ◽  
pp. S100-S101 ◽  
Author(s):  
T. Mráček ◽  
E. Holzerová ◽  
N. Kovářová ◽  
P. Ješina ◽  
Z. Drahota ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Respiratory Chain ◽  
Reactive Oxygen Species Production ◽  
Reactive Oxygen ◽  
Mitochondrial Respiratory Chain ◽  
Oxygen Species ◽  
Species Production ◽  
Mitochondrial Respiratory

scholarly journals Reactive Oxygen Species Production by Forward and Reverse Electron Fluxes in the Mitochondrial Respiratory Chain

2011 ◽  
Vol 7 (3) ◽  
pp. e1001115 ◽  
Author(s):  
Vitaly A. Selivanov ◽  
Tatyana V. Votyakova ◽  
Violetta N. Pivtoraiko ◽  
Jennifer Zeak ◽  
Tatiana Sukhomlin ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Respiratory Chain ◽  
Reactive Oxygen Species Production ◽  
Reactive Oxygen ◽  
Mitochondrial Respiratory Chain ◽  
Oxygen Species ◽  
Species Production ◽  
Mitochondrial Respiratory

scholarly journals Pleiotropic Effects of Biguanides on Mitochondrial Reactive Oxygen Species Production

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Alena Pecinova ◽  
Zdenek Drahota ◽  
Jana Kovalcikova ◽  
Nikola Kovarova ◽  
Petr Pecina ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Respiratory Chain ◽  
Reactive Oxygen Species Production ◽  
Reactive Oxygen ◽  
Epidemiological Studies ◽  
The Body ◽  
Oxygen Species ◽  
Brown Adipose ◽  
First Choice ◽  
Species Production

Metformin is widely prescribed as a first-choice antihyperglycemic drug for treatment of type 2 diabetes mellitus, and recent epidemiological studies showed its utility also in cancer therapy. Although it is in use since the 1970s, its molecular target, either for antihyperglycemic or antineoplastic action, remains elusive. However, the body of the research on metformin effect oscillates around mitochondrial metabolism, including the function of oxidative phosphorylation (OXPHOS) apparatus. In this study, we focused on direct inhibitory mechanism of biguanides (metformin and phenformin) on OXPHOS complexes and its functional impact, using the model of isolated brown adipose tissue mitochondria. We demonstrate that biguanides nonspecifically target the activities of all respiratory chain dehydrogenases (mitochondrial NADH, succinate, and glycerophosphate dehydrogenases), but only at very high concentrations (10−2–10−1 M) that highly exceed cellular concentrations observed during the treatment. In addition, these concentrations of biguanides also trigger burst of reactive oxygen species production which, in combination with pleiotropic OXPHOS inhibition, can be toxic for the organism. We conclude that the beneficial effect of biguanides should probably be associated with subtler mechanism, different from the generalized inhibition of the respiratory chain.

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