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Assessment of Memory Function in Pilocarpine-induced Epileptic Mice
13:34

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Published on: June 4, 2020

Methamphetamine-induced changes in the object recognition memory circuit.

Carmela M Reichel1, Lauren A Ramsey, Marek Schwendt

  • 1Department of Neurosciences, Medical University of South Carolina, 173 Ashley Avenue, Charleston, SC 29425, USA. reichel@musc.edu

Neuropharmacology
|November 26, 2011
PubMed
Summary
This summary is machine-generated.

Chronic methamphetamine use impairs object-in-place memory in rats. Both contingent and non-contingent meth reduced serotonin transporter levels, suggesting memory deficits may occur independently of neurotoxicity.

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Area of Science:

  • Neuroscience
  • Addiction Research
  • Cognitive Psychology

Background:

  • Chronic methamphetamine (meth) abuse is linked to persistent cognitive deficits in humans and animal models.
  • Understanding the neurobiological underpinnings of these deficits is crucial for developing effective interventions.

Purpose of the Study:

  • To investigate the impact of contingent and non-contingent meth administration on object-in-place (OIP) recognition memory.
  • To quantify monoamine transporter levels and neurotoxicity markers in brain regions critical for OIP memory.

Main Methods:

  • Male Long-Evans rats were subjected to acute meth binge or self-administered meth.
  • OIP recognition memory was assessed after a one-week withdrawal period.
  • Western blot analysis was used to measure serotonin transporter (SERT), norepinephrine transporter (NET), and dopamine transporter levels, along with neurotoxicity markers.

Main Results:

  • Both meth regimens impaired OIP recognition memory performance.
  • Acute meth binge induced neurotoxicity, while both regimens decreased SERT in the perirhinal cortex and hippocampus.
  • Meth self-administration selectively decreased NET, indicating distinct neurochemical alterations depending on administration method.

Conclusions:

  • Methamphetamine-induced memory deficits can occur independently of overt neurotoxicity.
  • Alterations in SERT function within the OIP circuitry may contribute to cognitive impairments.
  • These findings highlight the complex neurobiological effects of chronic meth use on memory and brain function.