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Related Experiment Videos

Changes in cholecystokinin mRNA expression in methamphetamine-induced behavioral sensitization

F Fukamauchi1

  • 1Department of Molecular Medical Science, Tokyo Medical and Dental University, Japan.

Neurochemistry International
|April 1, 1996
PubMed
Summary

Methamphetamine (MAP) treatment significantly decreased cholecystokinin (CCK) mRNA levels in rat brains. These changes in CCK mRNA persisted for two weeks, potentially contributing to long-lasting behavioral sensitization.

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Molecular Biology

Background:

  • Methamphetamine (MAP) is a psychostimulant known to induce behavioral sensitization.
  • Neuropeptide cholecystokinin (CCK) plays a role in various brain functions and may be involved in drug addiction.

Purpose of the Study:

  • To investigate the effect of subchronic methamphetamine administration on cholecystokinin (CCK) mRNA levels in specific rat brain regions.
  • To determine if alterations in CCK mRNA persist after drug discontinuation and correlate with behavioral changes.

Main Methods:

  • Male Wistar rats were administered daily injections of methamphetamine (3 or 6 mg/kg) or saline for 14 days.
  • Following a 7 or 14-day withdrawal period, brain tissues (frontal cortex and hippocampus) were analyzed using Northern blot to quantify CCK mRNA levels.

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Main Results:

  • Subchronic methamphetamine treatment significantly reduced CCK mRNA levels in the frontal cortex and hippocampus.
  • These decreases in CCK mRNA were observed in rats treated with both 3 and 6 mg/kg doses of methamphetamine.
  • The observed alterations in CCK mRNA levels persisted for at least two weeks after cessation of methamphetamine administration.

Conclusions:

  • Subchronic methamphetamine exposure leads to a persistent downregulation of CCK mRNA in the rat frontal cortex and hippocampus.
  • These persistent changes in CCK mRNA may be implicated in the development of long-lasting behavioral sensitization to methamphetamine.
  • CCKergic system modulation could be a potential target for understanding and treating methamphetamine addiction.