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Methamphetamine-induced increase in striatal NF-kappaB DNA-binding activity is attenuated in superoxide dismutase

M Asanuma1, J L Cadet

  • 1Molecular Neuropsychiatry Section, NIH/ NIDA, Intramural Research Program, P.O. Box 5180, Baltimore, MD, USA.

Insights

Methamphetamine injections activate striatal nuclear factor-kappa B (NF-kappaB) activity, a process linked to reactive oxygen species. This activation was reduced in mice genetically engineered to combat oxidative stress.

Area of Science:

  • Neuroscience
  • Toxicology
  • Molecular Biology

Background:

  • Methamphetamine is a potent neurotoxin with significant abuse potential.
  • Nuclear factor-kappa B (NF-kappaB) is a key transcription factor involved in inflammatory and cellular stress responses.
  • Oxidative stress is implicated in the neurotoxicity of various drugs, including methamphetamine.

Purpose of the Study:

  • To investigate the effect of methamphetamine injection on striatal NF-kappaB activity.
  • To determine the role of reactive oxygen species in mediating methamphetamine-induced NF-kappaB activation.
  • To examine the impact of antioxidant defense mechanisms on this process.

Main Methods:

  • Administration of methamphetamine via intraperitoneal injection (10 mg/kg, 4 times with 2-h intervals) to rodents.
  • Measurement of striatal NF-kappaB DNA-binding activity using electrophoretic mobility shift assays (EMSA).
  • Utilized copper, zinc-superoxide dismutase (Cu, Zn-SOD) transgenic mice to assess the role of oxidative stress.

Main Results:

  • Methamphetamine injection induced a dose-dependent increase in striatal NF-kappaB activity.
  • Significant elevation in striatal NF-kappaB binding was observed 1-3 hours post-methamphetamine administration.
  • This induction was significantly attenuated in Cu, Zn-SOD transgenic mice in a gene dosage-dependent manner.

Conclusions:

  • Methamphetamine administration activates NF-kappaB DNA-binding in the striatum.
  • Reactive oxygen species generated during methamphetamine exposure appear to mediate this NF-kappaB activation.
  • Enhanced antioxidant defenses can mitigate methamphetamine-induced NF-kappaB activation, suggesting a role in neuroprotection.

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