Synaptic plasticity in the basal ganglia.

Area of Science:

• Neuroscience
• Cellular and Molecular Biology

Background:

• Activity-dependent synaptic plasticity is fundamental to basal ganglia functions.
• This plasticity is increasingly recognized as the mechanism underlying various forms of learning, including acquisition, maintenance, and extinction.

Purpose of the Study:

• To review synaptic plasticity within the corticostriatal pathway.
• To explore the roles of intracellular signaling molecules, dopamine, and endocannabinoids in modulating synaptic plasticity.
• To bridge the gap between molecular mechanisms and systems-level learning operations.

Main Methods:

• Review of existing literature on synaptic plasticity in the basal ganglia.
• Analysis of studies investigating long-term potentiation and long-term depression.
• Examination of the influence of calcium, dopamine, and endocannabinoids on plasticity induction and expression.

Main Results:

• Both long-term potentiation and long-term depression are observed in the corticostriatal pathway.
• Intracellular calcium signaling is important but not the sole determinant of plasticity.
• Dopamine and endocannabinoids critically modulate plasticity magnitude, direction, and induction requirements.
• Spike-timing dependent plasticity phenomena involve dopamine and endocannabinoid signaling.

Conclusions:

• Synaptic plasticity in the corticostriatal pathway is a key mechanism for reinforcement-related learning.
• Dopamine and endocannabinoids are crucial modulators of this plasticity.
• Further research is needed to fully elucidate the link between molecular mechanisms and systems-level learning, particularly concerning long-term potentiation.