Recommended safe practices for using the neurotoxin MPTP in animal experiments
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S C Yang1, S P Markey, K S Bankiewicz
1Laboratory of Clinical Science, National Institute of Mental Health, Bethesda, MD 20982.
Abstract:
The metabolism and distribution of the parkinsonian syndrome inducing neurotoxin MPTP has been studied in non-human primates and mice housed in controlled environmental chambers. 14C6-MPTP was prepared and injected at concentrations normally employed for lesioning experiments (30 mg/kg in mice, 0.3 mg/kg in monkeys). All interior surfaces of the chambers which could be reached by animals or their excreta were contaminated with radiolabeled metabolites. Vapor born unmetabolized MPTP was negligible, although significant amounts of MPTP were found in the excreta of mice (less than or equal to 15% injected dose) and small amounts from rhesus monkeys (less than 2%). Procedures to minimize contact with animal fur, bedding and excreta should protect investigators working with MPTP over extended periods. Permanganate oxidation effectively detoxifies solutions of MPTP. MPTP, MPP+, common synthetic intermediates, and the products of MPTP's oxidation are not mutagenic as measured by a Salmonella-microsome assay.
Insights
Researchers studied the neurotoxin MPTP in primates and mice, finding it contaminates surfaces via excreta, not vapor. Safe handling procedures and permanganate oxidation are recommended for MPTP research.
Area of Science:
- Neuroscience
- Toxicology
- Pharmacology
Background:
- The neurotoxin MPTP (1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine) is a critical tool for modeling Parkinson's disease.
- Understanding MPTP's distribution and metabolism is crucial for laboratory safety and experimental design.
Purpose of the Study:
- To investigate the distribution and metabolic fate of radiolabeled MPTP in non-human primates and mice.
- To assess potential exposure routes for researchers and evaluate detoxification methods.
Main Methods:
- Controlled environmental chambers were used to house animals injected with 14C6-MPTP.
- Radioactivity levels were measured in excreta, bedding, and air.
- Mutagenicity of MPTP and related compounds was assessed using a Salmonella-microsome assay.
Main Results:
- MPTP metabolites contaminated chamber surfaces through animal excreta.
- Vapor-borne unmetabolized MPTP was negligible.
- Excreta contained up to 15% of the injected MPTP dose in mice and <2% in rhesus monkeys.
- MPTP, MPP+, intermediates, and oxidation products were not mutagenic.
Conclusions:
- MPTP exposure risk for researchers is primarily through contact with contaminated excreta and surfaces, not inhalation.
- Permanganate oxidation is an effective method for detoxifying MPTP solutions.
- MPTP and its related compounds do not pose a mutagenic risk.