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Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase,...
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Updated: Oct 8, 2025

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Mitochondrial function influences expression of methamphetamine-induced behavioral sensitization.

I Daphne Calma1,2, Amanda L Persons1,3,2, T Celeste Napier4,5,6

  • 1Departments of Psychiatry and Behavioral Sciences, Rush University Medical Center, Chicago, IL, 60612, USA.

Scientific Reports
|January 1, 2022
PubMed
Summary

Repeated methamphetamine use causes long-term brain changes. Mitochondrial function, targeted by rotenone during abstinence, significantly impacts these persistent methamphetamine-induced behaviors.

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Area of Science:

  • Neuroscience
  • Toxicology
  • Cell Biology

Background:

  • Repeated methamphetamine (Meth) use induces persistent neurobiological and behavioral alterations.
  • These long-lasting changes suggest significant cellular energy demands, implicating mitochondrial dysfunction.

Purpose of the Study:

  • To investigate the role of mitochondrial function in maintaining methamphetamine-induced behavioral changes long after cessation of drug self-administration.
  • To determine if mitochondrial integrity during abstinence influences the expression of established behavioral sensitization.

Main Methods:

  • Rats underwent 14 days of daily intravenous methamphetamine self-administration.
  • The mitochondrial toxin rotenone was administered during early, mid, or late abstinence periods (days 0, 14, or 28).
  • Behavioral sensitization to methamphetamine was assessed on abstinence day 61.

Main Results:

  • Rotenone administration impaired the expression of methamphetamine-induced behavioral sensitization.
  • The inhibitory effect of rotenone was more pronounced with later exposure during abstinence.
  • These findings indicate that methamphetamine-initiated neurobiological processes continue to evolve during abstinence.

Conclusions:

  • Mitochondrial function is critical for the expression of long-term behavioral changes induced by methamphetamine.
  • Methamphetamine-induced neuroplasticity progresses during abstinence, making the brain more vulnerable to mitochondrial insults over time.
  • Targeting mitochondrial pathways may offer novel therapeutic strategies for treating persistent methamphetamine use disorder.