Parabrachial-to-parasubthalamic Nucleus Pathway Mediates Fear-induced Suppression of Feeding in Male Mice

Overview

Journal Nat Commun

Specialty Biology

Date 2022 Dec 30

PMID 36585411

Authors

Takashi Nagashima

Suguru Tohyama

Kaori Mikami

Masashi Nagase

Mieko Morishima

Atsushi Kasai

Hitoshi Hashimoto

Ayako M Watabe

Affiliations

Soon will be listed here.

Abstract

Feeding behavior is adaptively regulated by external and internal environment, such that feeding is suppressed when animals experience pain, sickness, or fear. While the lateral parabrachial nucleus (lPB) plays key roles in nociception and stress, neuronal pathways involved in feeding suppression induced by fear are not fully explored. Here, we investigate the parasubthalamic nucleus (PSTN), located in the lateral hypothalamus and critically involved in feeding behaviors, as a target of lPB projection neurons. Optogenetic activation of lPB-PSTN terminals in male mice promote avoidance behaviors, aversive learning, and suppressed feeding. Inactivation of the PSTN and lPB-PSTN pathway reduces fear-induced feeding suppression. Activation of PSTN neurons expressing pituitary adenylate cyclase-activating polypeptide (PACAP), a neuropeptide enriched in the PSTN, is sufficient for inducing avoidance behaviors and feeding suppression. Blockade of PACAP receptors impaires aversive learning induced by lPB-PSTN photomanipulation. These findings indicate that lPB-PSTN pathway plays a pivotal role in fear-induced feeding suppression.

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