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Endogenous DNA adducts may contribute to the etiology of human genetic disease and cancer. One potential source of endogenous DNA adducts is lipid peroxidation, which generates mutagenic carbonyl compounds such as malondialdehyde. A sensitive mass spectrometric method permitted detection and quantitation of the major malondialdehyde-DNA adduct, a(More)
The dose of (-)deprenyl (2.0 mg/kg/day, sc, for 3 weeks) which significantly increased activities of superoxide dismutase (SOD) and catalase in the striatum of young male rats significantly reduced these activities in young female rats but did not change the SOD activity in old female rats. In order to clarify these effects, different doses of the drug were(More)
The effect of a protein-free diet (PFD) on hepatic activity of glutathione S-transferase (GST) and hepatic content of total glutathione (GSH) was examined in young (9-month-old), middle-aged (17-month-old) and old (27-month-old) C57BL/6CrS1c female mice. There were no significant differences in the control values of GSH or of enzyme activity for four of(More)
The biliary excretion of digitoxin (Dt3) and its metabolites were compared between young (3-month-old) and old (25-month-old) male Wistar rats after an iv injection of [3H]Dt3 (0.03 mg/100g body weight) for 2 hrs. The 2-hr. total biliary recovery of iv injected radioactivity (percent of the dose) was two times lower in old rats (7.40 +/- 1.36% mean +/- SD)(More)
The effects of oxazepam on coordination and maximal seizure were compared between young (6-month-old) and old (24-month-old) BDF1 mice by using a rotorod test and a pentylenetetrazole (PTZ)-induced seizure test, respectively. The apparent sensitivity to oxazepam's anticonvulsant effect, as examined by its effect on PTZ-induced maximal seizure, was increased(More)
Responses of hepatic glutathione S-transferase (GST) activities to protein-free diet (PFD) and normal diet (ND) refeeding were compared for young (6-month-old) and old (22-month-old) C57/BL male mice. Enzyme activities toward 1-chloro-2,4-dinitrobenzene (CDNB) were not significantly different between young and old rat livers in the basal condition without(More)
The anticonvulsant effect of phenytoin was examined in BDF1 mice of both sexes and various ages (6, 12, 24 and 30 months old) using the abolition of the tonic hindlimb extensor component of maximal electroshock seizure as the index. The minimal effective plasma concentration of phenytoin was significantly lower in 24- and 30-month-old mice compared with(More)
We have recently reported that the anticonvulsant effect of phenytoin increases with age in mice (1). Since some of the mechanisms of anticonvulsant action of phenytoin and phenobarbital may be different, the present study sought to determine whether a similar increase with age in the anticonvulsant effect of phenobarbital could also be observed. The(More)
The effects of age on the neurotoxicity of phenobarbital and its anticonvulsant effect were examined in female BDF1 mice of different ages by means of a rotorod test and the pentylenetetrazole (PTZ)-induced maximal seizure, respectively. The minimal neurotoxic concentrations (MTCs) of phenobarbital in both plasma and brain evaluated by a rotorod test were(More)
Female Fischer-344 rats of different ages (8 and 25 months old) were fed a protein-free diet (PFD) for 7 days and refed a normal diet (ND) (23% protein) thereafter. Rats were killed immediately after the PFD was stopped (day 0) and at different time intervals during refeeding of a ND. Four subunits (1,2,3 and 4) and activities of glutathione S-transferases(More)