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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The effect of glutathione depletion on 14CO2 evolution from [14C]methyl-labeled aminopyrine in intact rats.

The effect of hepatic glutathione depletion on 14CO2 evolution from [14C]methyl-labeled aminopyrine was assessed in fed male Sprague-Dawley rats. Within 30 min of i.p. administration of either diethylmaleate or phorone, hepatic glutathione fell approximately 75 to 80% and remained depressed for the ensuing 120 min. [14C]Aminopyrine was i.p. administered 30 min after the glutathione-lowering agents (zero time) and exhaled 14CO2 was collected at 15-min intervals for the next 120 min. Parameters of 14CO2 exhalation including peak exhalation rate, cumulative exhalation from 0 to 120 min and the elimination rate constant were all impaired in glutathione-depleted rats. Metabolism of the [14C]methyl groups involves N-demethylation with formation of formaldehyde, oxidation to formate and conversion to 14CO2. Glutathione depletion did not affect CO2 evolution from i.p. administered formate or bicarbonate. The glutathione-dependent step presumably involves either or both generation of formaldehyde or its subsequent oxidation to formate.[1]

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