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∆FosB differentially modulates nucleus accumbens direct and indirect pathway function.

Brad A Grueter¹, Alfred J Robison, Rachael L Neve

¹Nancy Pritzker Laboratory, Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Palo Alto, CA 94305, USA.

Proceedings of the National Academy of Sciences of the United States of America

|January 16, 2013

Summary

This summary is machine-generated.

The transcription factor delta FosB (∆FosB) alters synaptic function in nucleus accumbens medium spiny neurons (MSNs) differently in direct and indirect pathways, impacting cocaine-related behaviors.

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Area of Science:

Neuroscience
Molecular Biology
Addiction Research

Background:

Synaptic plasticity in the nucleus accumbens (NAc) medium spiny neurons (MSNs) is crucial for reward learning and addiction.
The transcription factor delta FosB (∆FosB) is linked to drug-induced gene expression changes in the NAc, but its direct synaptic effects are unclear.

Purpose of the Study:

To investigate the cell type-specific effects of ∆FosB on synaptic function and morphology in NAc MSNs.
To determine the behavioral consequences of ∆FosB manipulation in distinct NAc pathways.

Main Methods:

Overexpression of ∆FosB in D1 and D2 receptor-expressing MSNs in the NAc.
Electrophysiological recordings to assess synaptic strength and silent synapses.
Dendritic spine morphology analysis.
In vivo behavioral experiments assessing responses to cocaine.

Main Results:

∆FosB decreased excitatory synaptic strength and increased silent synapses in D1-MSNs (direct pathway).
∆FosB decreased silent synapses in NAc shell D2-MSNs (indirect pathway) but not in the core.
∆FosB increased immature dendritic spines in D1-MSNs but not D2-MSNs.
Selective ∆FosB overexpression in NAc direct pathway MSNs enhanced cocaine behavioral responses.

Conclusions:

∆FosB differentially modulates synaptic properties in NAc direct and indirect pathway MSNs in a cell type- and subregion-specific manner.
Direct pathway ∆FosB expression is sufficient to enhance behavioral responses to cocaine, highlighting its role in addiction.