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Difference between revisions of "Vrbacky 2007 Biochim Biophys Acta"

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|topics=Respiration; OXPHOS; ETS Capacity, Coupling; Membrane Potential, Ion Homeostasis
|topics=Respiration; OXPHOS; ETS Capacity, Coupling; Membrane Potential, Ion Homeostasis
|instruments=Oxygraph-2k, Spectrophotometry; Spectrofluorimetry
|instruments=Oxygraph-2k, Spectrophotometry; Spectrofluorimetry
|articletype=Protocol; Manual
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Revision as of 14:20, 20 October 2010

Publications in the MiPMap
Vrbacky M, Drahota Z, Mracek T, Vojtรญskova A, Jesina P, Stopka P, Houstek J (2007) Respiratory chain components involved in the glycerophosphate dehydrogenase-dependent ROS production by brown adipose tissue mitochondria. Biochim. Biophys. Acta. 1767 (7): 989-97.

ยป PMID: 17560536

Vrbacky M, Drahota Z, Mracek T, Vojtiskova A, Jesina P, Stopka P, Houstek J (2007) Biochim. Biophys. Acta

Abstract: Involvement of mammalian mitochondrial glycerophosphate dehydrogenase (mGPDH, EC 1.1.99.5) in reactive oxygen species (ROS) generation was studied in brown adipose tissue mitochondria by different spectroscopic techniques. Spectrofluorometry using ROS-sensitive probes CM-H2 DCFDA and Amplex Red was used to determine the glycerophosphate- or succinate-dependent ROS production in mitochondria supplemented with respiratory chain inhibitors antimycin A and myxothiazol. In case of glycerophosphate oxidation, most of the ROS originated directly from mGPDH and coenzyme Q while complex III was a typical site of ROS production in succinate oxidation. Glycerophosphate-dependent ROS production monitored by KCN-insensitive oxygen consumption was highly activated by one-electron acceptor ferricyanide, whereas succinate-dependent ROS production was unaffected. In addition, superoxide anion radical was detected as a mGPDH-related primary ROS species by fluorescent probe dihydroethidium, as well as by electron paramagnetic resonance (EPR) spectroscopy with DMPO spin trap. Altogether, the data obtained demonstrate pronounced differences in the mechanism of ROS production originating from oxidation of glycerophosphate and succinate indicating that electron transfer from mGPDH to coenzyme Q is highly prone to electron leak and superoxide generation. โ€ข Keywords: Brown adipose tissue mitochondria, Glycerophosphate dehydrogenase, Reactive oxygen species, Fluorescent probes, Oxygraphy, EPR


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Organism: Other Mammal"Other Mammal" is not in the list (Human, Pig, Mouse, Rat, Guinea pig, Bovines, Horse, Dog, Rabbit, Cat, ...) of allowed values for the "Mammal and model" property. 


Enzyme: Complex III  Regulation: Respiration; OXPHOS; ETS Capacity"Respiration; OXPHOS; ETS Capacity" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property., Coupling; Membrane Potential"Coupling; Membrane Potential" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property., Ion Homeostasis"Ion Homeostasis" is not in the list (Aerobic glycolysis, ADP, ATP, ATP production, AMP, Calcium, Coupling efficiency;uncoupling, Cyt c, Flux control, Inhibitor, ...) of allowed values for the "Respiration and regulation" property. 


HRR: Oxygraph-2k, Spectrophotometry; Spectrofluorimetry"Spectrophotometry; Spectrofluorimetry" is not in the list (Oxygraph-2k, TIP2k, O2k-Fluorometer, pH, NO, TPP, Ca, O2k-Spectrophotometer, O2k-Manual, O2k-Protocol, ...) of allowed values for the "Instrument and method" property.