Basolateral to Central Amygdala Neural Circuits for Appetitive Behaviors

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Molecular Psychiatry

Background:

• The basolateral amygdala (BLA) influences behaviors, projecting to the central amygdala (CeA).
• The CeA's role in appetitive (positive) behaviors is less understood than its role in aversive (negative) behaviors.
• Specific CeA circuits underlying motivated behaviors require further elucidation.

Purpose of the Study:

• To identify genetically distinct CeA neuron populations involved in appetitive behaviors.
• To dissect the functional circuitry between the BLA and CeA for appetitive behaviors.
• To understand the neural basis of promoting and suppressing motivated actions.

Main Methods:

• Utilized genetic labeling to distinguish CeA neuron populations.
• Investigated BLA-CeA pathways using circuit tracing and functional assays.
• Examined the role of specific neuronal subpopulations in mediating appetitive behaviors.

Main Results:

• Identified distinct CeA neuron populations mediating appetitive behaviors.
• Dissected a BLA-to-CeA circuit promoting appetitive behaviors: Protein phosphatase 1 regulatory subunit 1B+ BLA neurons projecting to dopamine receptor 1+ CeA neurons.
• Dissected a BLA-to-CeA circuit suppressing appetitive behaviors: R-spondin 2+ BLA neurons projecting to dopamine receptor 2+ CeA neurons.

Conclusions:

• Revealed genetically defined amygdala circuits that promote and suppress appetitive behaviors.
• These circuits are analogous to the direct and indirect pathways in the basal ganglia.
• Provides a framework for understanding the neural control of motivated behaviors.