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Losing Your Inhibition: GABAergic Plasticity in Emotional Learning

Elizabeth Lucas, Ph.D.
  • Date and time: February 21, 2017 from 3:30pm-4:30 pm
  • Location: 310 Kelly Hall
  • Speaker:  Elizabeth Lucas, Ph.D.
  • Affiliation: Postdoctoral Fellow, Icahn School of Medicine at Mt. Sinai

 

 

Fear and anxiety disorders, such as posttraumatic stress disorder, are the most common form of mental illness in the United States. By investigating the mechanisms by which fear memories are stored, we may uncover novel therapeutic avenues to prevent preservative fear and anxiety. Plasticity of discrete neural networks onto excitatory principal neurons in the basolateral amygdala underlies the acquisition and maintenance of fear memory, but the contribution of specific inhibitory microcircuits to stimulus gating and experience-dependent plasticity in this system remains poorly understood. I discovered a sparse, yet potent, subset of parvalbumin interneurons (PV-INs) that are morphologically and physiologically primed to gate afferent pathways conveying sensory stimuli during fear learning through feedforward inhibition onto amygdala principal cells. This PV-IN network was the target of extensive and persistent plasticity that disinhibited the amygdala after aversive learning, and enhancing PV-IN function attenuated expression of fear. Future work will explore novel inhibitory circuits for sex differences in fear and anxiety disorder-related behavior, as women are disproportionately affected by these illnesses.

Contact Anne Wailes for more information: awailes@vt.edu

* Beth Lucas Seminar Flyer.pdf
Losing Your Inhibition: GABAergic Plasticity in Emotional Learning