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Selenium deficiency potentiates methamphetamine-induced nigral neuronal loss; comparison with MPTP model
1Section of Pharmacology and Toxicology, Department of Pharmacy, College of Pharmacy, Kangwon National University, Korea Institute of Drug Abuse, Chunchon, South Korea. kimhc@cc.kangwon.ac.kr
Brain Research
|May 9, 2000
Summary
Selenium (Se) deficiency worsens methamphetamine (MA)-induced damage to dopamine cells in the substantia nigra (SN). Adequate selenium levels protect against this neurotoxicity, suggesting a role in preventing Parkinsonism.
Area of Science:
- Neuroscience
- Toxicology
- Nutritional Science
Background:
- Methamphetamine (MA) and MPTP are neurotoxins that induce dopaminergic cell damage in the substantia nigra (SN).
- Selenium (Se) is an essential trace element with antioxidant properties.
- Dietary selenium levels can influence susceptibility to neurotoxic insults.
Purpose of the Study:
- To investigate the role of selenium (Se) in modulating methamphetamine (MA)-induced dopaminergic neurotoxicity in the substantia nigra (SN).
- To determine if selenium deficiency exacerbates MA-induced neurotoxicity.
- To assess the protective effects of selenium repletion against MA-induced dopaminergic damage.
Main Methods:
- Male C57BL/6J mice were fed either selenium-deficient or selenium-replete diets for 90 days.
- Mice were subsequently treated with methamphetamine (MA) to induce dopaminergic toxicity.
- Levels of tyrosine hydroxylase-like immunoreactivity (TH-IR), dopamine (DA), and its metabolites (DOPAC, HVA) in the SN were measured.
Main Results:
- Selenium deficiency potentiated MA-induced reductions in TH-IR, DA, DOPAC, and HVA in the SN.
- The observed dopaminergic toxicity in Se-deficient mice was comparable to that induced by MPTP.
- Selenium repletion significantly protected against MA-induced dopaminergic toxicity.
Conclusions:
- Selenium-deficient mice treated with MA serve as a relevant model for Parkinsonism.
- Optimal selenium levels are crucial for preventing dopaminergic neurotoxicity induced by MA in the SN.
- Further research is needed to elucidate the distinct mechanisms underlying MA- or MPTP-mediated thermoregulation.