Cell type specific control of basolateral amygdala plasticity via entorhinal cortex-driven feedforward inhibition
Guthman, E. M.; Garcia, J. D.; Ma, M.; Chu, P.; Baca, S. M.; Smith, K. R.; Restrepo, D.; Huntsman, M. M.
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The basolateral amygdala (BLA) plays a vital role in associating specific sensory stimuli with salient valence information. Excitatory principal neurons (PNs) undergo plastic changes to encode this integrated sensory-valence information; however, local BLA inhibitory interneurons (INs) gate the plasticity of the PNs via feed forward inhibition (FFI). Despite extensive literature implicating parvalbumin expressing (PV+) INs in FFI in cortex and hippocampus, prior anatomical experiments in BLA implicate somatostatin expressing (Sst+) INs in BLA. In the present study, we combined patch clamp electrophysiology with chemogenetics, unsupervised cluster analysis, and predictive modeling and found that a previously unreported subpopulation of fast-spiking Sst+ INs mediate BLA FFI and gate plasticity.
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