Gq neuromodulation of BLA parvalbumin interneurons induces burst firing and mediates fear-associated network and behavioral state transition in mice

Xin Fu, Eric Teboul, Grant L. Weiss, Pantelis Antonoudiou, Chandrashekhar D. Borkar, Jonathan P. Fadok, Jamie Maguire () and Jeffrey G. Tasker ()
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Xin Fu: Tulane University
Eric Teboul: Tufts University School of Medicine and Graduate School of Biomedical Sciences
Grant L. Weiss: Tufts University School of Medicine and Graduate School of Biomedical Sciences
Pantelis Antonoudiou: Tufts University School of Medicine and Graduate School of Biomedical Sciences
Chandrashekhar D. Borkar: Tulane University
Jonathan P. Fadok: Tulane University
Jamie Maguire: Tufts University School of Medicine and Graduate School of Biomedical Sciences
Jeffrey G. Tasker: Tulane University

Nature Communications, 2022, vol. 13, issue 1, 1-16

Abstract: Abstract Patterned coordination of network activity in the basolateral amygdala (BLA) is important for fear expression. Neuromodulatory systems play an essential role in regulating changes between behavioral states, however the mechanisms underlying this neuromodulatory control of transitions between brain and behavioral states remain largely unknown. We show that chemogenetic Gq activation and α1 adrenoreceptor activation in mouse BLA parvalbumin (PV) interneurons induces a previously undescribed, stereotyped phasic bursting in PV neurons and time-locked synchronized bursts of inhibitory postsynaptic currents and phasic firing in BLA principal neurons. This Gq-coupled receptor activation in PV neurons suppresses gamma oscillations in vivo and in an ex vivo slice model, and facilitates fear memory recall, which is consistent with BLA gamma suppression during conditioned fear expression. Thus, here we identify a neuromodulatory mechanism in PV inhibitory interneurons of the BLA which regulates BLA network oscillations and fear memory recall.

Date: 2022
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DOI: 10.1038/s41467-022-28928-y

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