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Synaptic plasticity in the mesolimbic dopamine system.

Mark J Thomas1, Robert C Malenka

  • 1Departments of Neuroscience and Psychology, and Institute of Human Genetics, University of Minnesota, Minneapolis, MN 55455, USA.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|May 13, 2003
PubMed
Summary
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Drugs of abuse, like cocaine, induce lasting synaptic changes in the brain's reward pathways. These changes, involving long-term potentiation (LTP) and long-term depression (LTD), offer insights into motivated behavior.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Behavioral Science

Background:

  • Long-term potentiation (LTP) and long-term depression (LTD) are key to experience-dependent neural plasticity.
  • Directly linking experience-induced synaptic changes to behavior has been challenging.

Purpose of the Study:

  • Investigate the functional roles of LTP and LTD in vivo.
  • Utilize the effects of drugs of abuse to study synaptic plasticity in motivated behavior circuits.

Main Methods:

  • Administered drugs of abuse (e.g., cocaine) in vivo.
  • Focused on the nucleus accumbens (NAc) and ventral tegmental area (VTA) within the mesolimbic dopamine system.
  • Examined changes at excitatory synapses.

Main Results:

Related Experiment Videos

  • Drugs of abuse induce long-lasting alterations in excitatory synaptic strength within the NAc and VTA.
  • These drug-induced changes appear to activate the molecular mechanisms underlying LTP and LTD.

Conclusions:

  • Drugs of abuse provide a unique model for studying synaptic plasticity mechanisms and functions.
  • This research has significant implications for understanding motivated behavior and addiction.