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Multimodal and Site-Specific Plasticity of Amygdala Parvalbumin Interneurons after Fear Learning.

Neuron | Aug 3, 2016

Stimulus processing in fear conditioning is constrained by parvalbumin interneurons (PV-INs) through inhibition of principal excitatory neurons. However, the contributions of PV-IN microcircuits to input gating and long-term plasticity in the fear system remain unknown. Here we interrogate synaptic connections between afferent pathways, PV-INs, and principal excitatory neurons in the basolateral amygdala. We find that subnuclei of this region are populated two functionally distinct PV-IN networks. PV-INs in the lateral (LA), but not the basal (BA), amygdala possess complex dendritic arborizations, receive potent excitatory drive, and mediate feedforward inhibition onto principal neurons. After fear conditioning, PV-INs exhibit nucleus- and target-selective plasticity, resulting in persistent reduction of their excitatory input and inhibitory output in LA but not BA. These data reveal previously overlooked specializations of amygdala PV-INs and indicate specific circuit mechanisms for inhibitory plasticity during the encoding of associative fear memories.

Pubmed ID: 27427462 RIS Download

Mesh terms: Amygdala | Animals | Conditioning (Psychology) | Fear | Interneurons | Male | Mice | Neural Pathways | Neuronal Plasticity | Neurons | Parvalbumins | gamma-Aminobutyric Acid

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