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Methamphetamine-induced alteration in striatal p53 and bcl-2 expressions in mice
S Z Imam1, Y Itzhak, J L Cadet
1Neurochemistry Laboratory, Division of Neurotoxicology, HFT-132, National Center for Toxicological Research/FDA, 3900 NCTR Rd., Jefferson, AR 72079-9502, USA.
Abstract:
Methamphetamine (METH)-induced alterations in the expression of p53 and bcl-2 protein were studied in the striatum of wild type, neuronal nitric oxide synthase knockout (nNOS -/-) and copper zinc superoxide dismutase overexpressed (SOD-Tg) mice. METH treatment up-regulated p53 and down-regulated bcl-2 expression in the striatum of wild type mice. No significant alterations were observed in the expression of these proteins in the nNOS -/- or SOD-Tg mice. These data suggest that METH might cause its neurotoxic effects via the production of free radicals and secondary perturbations in the expression of genes known to be involved in apoptosis and cell death machinery.
Insights
Methamphetamine (METH) alters p53 and bcl-2 protein expression in mouse striatum, suggesting neurotoxicity may involve free radicals and apoptosis pathways. These effects were not observed in knockout or overexpressed enzyme models.
Area of Science:
- Neuroscience
- Molecular Biology
- Toxicology
Background:
- Methamphetamine (METH) is a potent neurotoxin with complex effects on the central nervous system.
- Apoptosis and cell death pathways are critical in understanding neurodegenerative processes and drug-induced toxicity.
- The roles of nitric oxide synthase and superoxide dismutase in METH neurotoxicity are not fully elucidated.
Purpose of the Study:
- To investigate the impact of METH on p53 and bcl-2 protein expression in the mouse striatum.
- To determine if neuronal nitric oxide synthase (nNOS) or copper zinc superoxide dismutase (SOD) influence METH-induced changes in these proteins.
Main Methods:
- Western blot analysis was used to quantify p53 and bcl-2 protein levels.
- Experiments were conducted in wild-type, nNOS knockout (nNOS -/-), and SOD-transgenic (SOD-Tg) mice.
- Mice were administered METH, and protein expression was analyzed in striatal tissue.
Main Results:
- METH treatment significantly upregulated p53 and downregulated bcl-2 expression in wild-type mice striatum.
- No significant changes in p53 or bcl-2 expression were observed in nNOS -/- or SOD-Tg mice following METH administration.
- These findings indicate a potential role for free radical production in METH-induced apoptosis.
Conclusions:
- METH neurotoxicity may be mediated by free radical production, leading to alterations in apoptosis-related gene expression.
- nNOS and SOD appear to play protective roles against METH-induced changes in p53 and bcl-2.
- Further research into these pathways could reveal novel therapeutic targets for METH abuse.