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- W76753036 abstract "I-123 Nisopropyl p-iodoamphetamine (IMP) is a useful radiotracer for imaging regional cerebral perfursion in a wide variety of neurological and cerebrovascular diseases. The major route of amine metabolism in the lung is the mixed function oxidase (MFO) system. A number of antidepressants and narcoleptic agents have been shown to displace amphetamine from the lung. If these drugs release IMP before it is metabolized to lipophobic products, brain concentration will be affected. The authors investigated the effects of these drugs on IMP distribution in animals with high and low pulmonary concentrations of MFO. When 1 mg/kg imipramine (IM) was injected iv into Wistar rats 30 min before IMP and 50 min before sacrifice, lung activity was depressed (4 + 1% ID vs 12 + 4% ID). Brain activity was depressed only with 4 mg/kg IM (l.5 + .3% ID vs 2.7 + .7% ID). There was no significant difference in IMP brain activity without IM and when IM was given simultaneously with, 5 or 15 min after IMP. In New Zealand rabbits which have a low pulmonary MFO concentration, IM altered lung and brain uptake during simultaneous injection and as late as 15 min after IMP. Lung uptake was reduced 51%more » and brain uptake was increased 25%, 20%, and 19% when IM was injected 0, 5 and 15 min after IMP. The MAO inhibitors, phenelzine and L deprenyl, did not alter the brain, lung or liver IMP activity in rats at a dose of 5 mg/kg. These data are consistent with a model in which IMP is trapped and metabolized in the lung by the MFO system. Assuming an active MFO system in the human (unlike the rabbit), brain activity of IMP will not be altered by either IM or MAO inhibitors.« less" @default.
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- W76753036 date "1985-05-01" @default.
- W76753036 modified "2023-09-24" @default.
- W76753036 title "The effect of anti-depressant and narcoleptic drugs on isopropyl iodoamphetamine biodistribution" @default.
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