Dopamine, acetylcholine and nitric oxide systems interact to induce corticostriatal synaptic plasticity

Area of Science:

• Neuroscience
• Synaptic Plasticity
• Basal Ganglia Function

Background:

• Corticostriatal synapses exhibit two forms of plasticity: long-term depression (LTD) and long-term potentiation (LTP).
• These changes in synaptic efficacy significantly impact basal ganglia physiological activity.
• Striatal neurons receive glutamatergic input from the cortex, dopamine (DA) from the nigrostriatal pathway, and acetylcholine (ACh) and nitric oxide (NO) from intrinsic circuits.

Purpose of the Study:

• To investigate the interaction of neurotransmitter systems in regulating corticostriatal synaptic plasticity.
• To elucidate the role of specific interneurons in controlling LTD and LTP induction.
• To understand how integrated inputs shape striatal output.

Main Methods:

• Analysis of intracellular second messenger systems.
• Investigation of interactions between glutamatergic, dopaminergic, cholinergic, and nitrergic systems.
• Study of feedforward control mechanisms exerted by interneurons.

Main Results:

• Dopamine (DA), acetylcholine (ACh), and nitric oxide (NO) interact to determine whether LTD or LTP is triggered.
• Striatal interneurons producing ACh and NO are activated by cortical input during plasticity induction.
• These interneurons stimulate intracellular changes in projection neurons necessary for LTD or LTP.

Conclusions:

• Interneurons provide feedforward control of striatal projection neuron excitability.
• Coordinated expression of LTD and LTP at excitatory synapses is ensured by interneurons.
• Integration of cortical, dopaminergic, cholinergic, and nitrergic inputs dictates striatal output to the basal ganglia.