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MPTP in mice: treatment, distribution and possible source of contamination
J M Crampton1, C E Runice, T J Doyle
1School of Pharmacy, Parkinson's Disease Research Program, Creighton University, Omaha, NE 68178.
Abstract:
Mice were treated daily with [3H]MPTP (30 mg/kg, 1 uCi, s.c.) for 1, 3, and 10 days to determine the fate and localization of tritiated compounds. An untreated mouse was housed either in the same cage ("cage-mate control") or in an adjacent cage separated by mesh-wire ("near-neighbor control"). The radioactivity measured in blood, brain, liver, and remaining body of [3H]MPTP-treated mice was dependent on the total dose of the drug the animals received and did not vary with the type of tissue analyzed. Significant amounts of radioactivity were found in the tissues of the "cage-mate control" mice, but not of the "near-neighbor control" mice. The route of transmission appears to be through the urine, as the urine of [3H]MPTP-treated mice was highly radioactive after the drug injection. Only traces of radioactivity were found in their feces and there was no increase in the background radiation in the environment of the cages, indicating that the tritiated compounds were not exhaled. Proper disposal of urinary products of MPTP-treated animals is therefore necessary to reduce the risk of possible drug contamination in humans.
Insights
Tritiated MPTP contamination can spread to cage-mate mice through urine. Proper disposal of waste from MPTP-treated animals is crucial to prevent human exposure.
Area of Science:
- Neuroscience
- Toxicology
- Pharmacology
Background:
- MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) is a neurotoxin used in research.
- Understanding the excretion and transmission pathways of MPTP is vital for laboratory safety.
Purpose of the Study:
- To determine the fate and localization of tritiated MPTP ([3H]MPTP) in mice.
- To investigate potential transmission routes of [3H]MPTP to untreated control animals.
Main Methods:
- Mice were administered daily injections of [3H]MPTP for 1, 3, or 10 days.
- Radioactivity was measured in blood, brain, liver, and body tissues of treated and control mice.
- Urine and feces were analyzed for the presence of radioactivity.
Main Results:
- Radioactivity levels in [3H]MPTP-treated mice correlated with the administered dose.
- Significant radioactivity was detected in cage-mate controls, but not in near-neighbor controls.
- Urine from treated mice showed high radioactivity, indicating it as the primary excretion route.
Conclusions:
- [3H]MPTP is primarily excreted via urine.
- Contamination can occur between direct cage-mates through urinary products.
- Safe handling and disposal protocols for MPTP-treated animal waste are essential to mitigate human exposure risks.