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Serotonin 5-HT2C receptor knockout in mice attenuates fear responses in contextual or cued but not compound context-cue fear conditioning

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Title: Serotonin 5-HT2C receptor knockout in mice attenuates fear responses in contextual or cued but not compound context-cue fear conditioning
Authors: Bouchekioua, Youcef Browse this author
Nebuka, Mao Browse this author
Sasamori, Hitomi Browse this author
Nishitani, Naoya Browse this author
Sugiura, Chiaki Browse this author
Sato, Masaaki Browse this author →KAKEN DB
Yoshioka, Mitsuhiro Browse this author →KAKEN DB
Ohmura, Yu Browse this author →KAKEN DB
Issue Date: 11-Feb-2022
Publisher: Springer Nature
Journal Title: Translational Psychiatry
Volume: 12
Issue: 1
Start Page: 58
Publisher DOI: 10.1038/s41398-022-01815-2
Abstract: Previous findings have proposed that drugs targeting 5-HT2C receptors could be promising candidates in the treatment of trauma- and stress-related disorders. However, the reduction of conditioned freezing observed in 5-HT2C receptor knock-out (KO) mice in previous studies could alternatively be accounted for by increased locomotor activity. To neutralize the confound of individual differences in locomotor activity, we measured a ratio of fear responses during versus before the presentation of a conditioned stimulus previously paired with a footshock (as a fear measure) by utilizing a conditioned licking suppression paradigm. We first confirmed that 5-HT2C receptor gene KO attenuated fear responses to distinct types of single conditioned stimuli (context or tone) independently of locomotor activity. We then assessed the effects of 5-HT2C receptor gene KO on compound fear responses by examining mice that were jointly conditioned to a context and a tone and later re-exposed separately to each. We found that separate re-exposure to individual components of a complex fear memory (i.e., context and tone) failed to elicit contextual fear extinction in both 5-HT2C receptor gene KO and wild-type mice, and also abolished differences between genotypes in tone-cued fear extinction. This study delineates a previously overlooked role of 5-HT2C receptors in conditioned fear responses, and invites caution in the future assessment of molecular targets and candidate therapies for the treatment of PTSD.
Type: article
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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