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Serotonergic Suppression of Mouse Prefrontal Circuits Implicated in Task Attention
Michael K Tian1, Eric F Schmidt2, Evelyn K Lambe3
1Department of Physiology, University of Toronto , Toronto, ON, Canada.
Eneuro
|November 16, 2016
Summary
Serotonin strongly inhibits prefrontal cortex layer 6 neurons, impacting attention circuits. This reveals how serotonin disruptions affect attention in psychiatric disorders.
Area of Science:
- Neuroscience
- Neurobiology
- Psychiatry
Background:
- Serotonin (5-HT) influences attention via poorly understood neurobiological mechanisms.
- Prefrontal cortex layer 6 (L6) pyramidal neurons are crucial for attention and express 5-HT receptors.
Purpose of the Study:
- To investigate the serotonergic modulation of prefrontal L6 pyramidal neurons and their excitatory output.
- To explore 5-HT's effects on circuits involving L6 pyramidal neurons and L5 GABAergic interneurons.
Main Methods:
- Whole-cell recordings and pharmacological manipulations in mouse brain slices.
- Optogenetic techniques to investigate excitatory circuits between L6 pyramidal neurons and L5 interneurons.
Main Results:
- Prefrontal L6 pyramidal neurons exhibit significant serotonergic inhibition.
- Direct 5-HT-sensitive connections were identified between L6 pyramidal neurons and two classes of L5 interneurons.
Conclusions:
- Establishes a neurobiological framework for understanding how serotonin disruption impacts task attention.
- Provides insights into attention deficits in psychiatric disorders linked to altered 5-HT signaling.
