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Neurochemical and behavioral differences between d-methamphetamine and d-amphetamine in rats
James R Shoblock1, Eric B Sullivan, Isabelle M Maisonneuve
1Center for Neuropharmacology and Neuroscience, Albany Medical College, 47 New Scotland Avenue (MC-136), Albany, NY 12208, USA. ShobloJ@mail.amc.edu
Psychopharmacology
|December 20, 2002
Summary
Methamphetamine (METH) and amphetamine (AMPH) exhibit distinct neurochemical effects in the brain, influencing dopamine and glutamate release differently. These differences in psychostimulant action may explain METH
Area of Science:
- Neuroscience
- Pharmacology
- Addiction Research
Background:
- Methamphetamine (METH) and amphetamine (AMPH) are commonly abused psychostimulants.
- METH is perceived as more potent and addictive than AMPH, but underlying neurobiological differences are not well-understood.
Purpose of the Study:
- To investigate neurobiological distinctions between METH and AMPH.
- To identify potential therapeutic targets for METH addiction treatment.
Main Methods:
- In vivo microdialysis in rats to measure dopamine and glutamate levels in the nucleus accumbens (NAC) and prefrontal cortex (PFC).
- Locomotor activity studies were conducted across various drug doses and after glutamate antagonist pretreatment in the NAC.
Main Results:
- Both METH and AMPH increased dopamine in the NAC similarly, but AMPH was more effective in the PFC.
- AMPH increased glutamate in the NAC, while METH increased glutamate in the PFC.
- METH produced lower peak locomotor activity than AMPH, an effect reversed by glutamate antagonists in the NAC.
Conclusions:
- This study identified novel neurochemical and behavioral differences between METH and AMPH.
- Findings suggest that targeting nucleus accumbens glutamate or prefrontal cortex dopamine/glutamate pathways could be beneficial for treating METH addiction.