Oct 10, 2019

Dual and Opposing Functions of the Central Amygdala in the Modulation of Pain

Cell Reports
Torri D WilsonYarimar Carrasquillo

Abstract

Pain perception is essential for survival and can be amplified or suppressed by expectations, experiences, and context. The neural mechanisms underlying bidirectional modulation of pain remain largely unknown. Here, we demonstrate that the central nucleus of the amygdala (CeA) functions as a pain rheostat, decreasing or increasing pain-related behaviors in mice. This dual and opposing function of the CeA is encoded by opposing changes in the excitability of two distinct subpopulations of GABAergic neurons that receive excitatory inputs from the parabrachial nucleus (PB). Thus, cells expressing protein kinase C-delta (CeA-PKCδ) are sensitized by nerve injury and increase pain-related responses. In contrast, cells expressing somatostatin (CeA-Som) are inhibited by nerve injury and their activity drives antinociception. Together, these results demonstrate that the CeA can amplify or suppress pain in a cell-type-specific manner, uncovering a previously unknown mechanism underlying bidirectional control of pain in the brain.

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Mentioned in this Paper

Cerebellar Nuclei
Brain
Experience
Cea protein, zebrafish
ANKRD3 protein, human
Parabrachial Nucleus
Wal-Som
Perception
Amygdaloid Structure
GABAergic Neurons

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