Metabolism of Caffeine by Mouse Liver Microsomes: GSH or Cytosol Causes a Shift in Products From 1, 3, 7-Trimethylurate to a Substituted Diaminouracil
Document Type
Article
Publication Date
9-19-1983
Description
Incubation of [14C] caffeine with hepatic microsomes from male AKR/J mice resulted in the formation of several metabolites including 1, 3, 7-trimethylurate and 6-amino-5-(N-formylmethyl-amino)-1, 3-dimethyluracil. These two compounds comprised about 60% of products and are major urinary metabolites in several animals. When cytosol was included during incubation, there was a 14-fold increase in yield of the uracil at the expense of the urate; the combination of the two metabolites remained about 60% of total products. Cytosol alone was catalytically inert. Glutathione and other sulfhydryl compounds reproduced the effect of cytosol, and the action of cytosol was accounted for quantitatively by its sulfhydryl content. We propose that an oxidized intermediate of caffeine en route to trimethylurate is reduced by glutathione to the ring-opened uracil derivative.
Citation Information
Ferrero, James L.; and Neims, Allen H.. 1983. Metabolism of Caffeine by Mouse Liver Microsomes: GSH or Cytosol Causes a Shift in Products From 1, 3, 7-Trimethylurate to a Substituted Diaminouracil. Life Sciences. Vol.33(12). 1173-1178. https://doi.org/10.1016/0024-3205(83)90022-X PMID: 6888171 ISSN: 0024-3205