Nucleus accumbens pathways control cell-specific gene expression in the medial prefrontal cortex

Area of Science:

• Neuroscience
• Molecular Biology
• Genetics

Background:

• The medial prefrontal cortex (mPFC) is integral to limbic and cognitive functions via cortico-basal ganglia-thalamo-cortical loops.
• Nucleus accumbens (NAc) output neurons, expressing D1 or D2 receptors, modulate information flow within these circuits.
• Dysfunction in NAc circuits can lead to mPFC transcriptomal changes, potentially contributing to neurological disorders.

Purpose of the Study:

• To investigate the impact of nucleus accumbens (NAc) output pathway activity on medial prefrontal cortex (mPFC) gene expression.
• To identify differentially expressed genes (DEGs) in the mPFC following targeted manipulation of NAc D1 and D2 receptor-expressing neurons.

Main Methods:

• Utilized RNA sequencing to analyze gene expression changes in the mPFC.
• Employed a reversible neurotransmission blocking (RNB) technique in D1-receptor (D1-RNB) and D2-receptor (D2-RNB) NAc neurons.
• Performed Gene Set Enrichment Analysis (GSEA) on identified DEGs.

Main Results:

• Gene sets for layer 5b and 6 pyramidal neurons in the mPFC were downregulated in both D1-RNB and D2-RNB conditions.
• Layer 5a pyramidal neuron gene sets were upregulated in the mPFC in D1-RNB mice.
• Layer 5a pyramidal neuron gene sets were downregulated in the mPFC in D2-RNB mice.

Conclusions:

• NAc output pathways play a crucial role in regulating mPFC gene expression.
• Distinct NAc output pathways differentially control gene expression in specific mPFC pyramidal neuron layers.
• These findings highlight the NAc's influence on mPFC circuitry and its implications for brain function and disease.