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A critical time window for dopamine actions on the structural plasticity of dendritic spines
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A critical time window for dopamine actions on the structural plasticity of dendritic spines
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A critical time window for dopamine actions on the structural plasticity of dendritic spines
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Journal Article
A critical time window for dopamine actions on the structural plasticity of dendritic spines
2014
Overview
Animal behaviors are reinforced by subsequent rewards following within a narrow time window. Such reward signals are primarily coded by dopamine, which modulates the synaptic connections of medium spiny neurons in the striatum. The mechanisms of the narrow timing detection, however, remain unknown. Here, we optically stimulated dopaminergic and glutamatergic inputs separately and found that dopamine promoted spine enlargement only during a narrow time window (0.3 to 2 seconds) after the glutamatergic inputs. The temporal contingency was detected by rapid regulation of adenosine 3′,5′-cyclic monophosphate in thin distal dendrites, in which protein-kinase A was activated only within the time window because of a high phosphodiesterase activity. Thus, we describe a molecular basis of reinforcement plasticity at the level of single dendritic spines.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
/ Animals
/ Cyclic AMP-Dependent Protein Kinases - metabolism
/ Dendritic Spines - drug effects
/ Dendritic Spines - physiology
/ Dopamine
/ Dopamine Plasma Membrane Transport Proteins - genetics
/ Dopamine Plasma Membrane Transport Proteins - metabolism
/ Electrical Synapses - drug effects
/ Electrical Synapses - physiology
/ learning
/ Mice
/ Neuronal Plasticity - drug effects
/ Phosphoric Diester Hydrolases - metabolism
/ Reward
/ Spine
/ synapse
