Urocortin 3 modulates social discrimination abilities via corticotropin-releasing hormone receptor type 2

Jan M. Deussing, Johannes Breu, Claudia Kühne, Magdalena Kallnik, Mirjam Bunck, Lisa Glasl, Yi Chun Yen, Mathias V. Schmidt, Regine Zurmühlen, Annette M. Vogl, Valérie Gailus-Durner, Helmut Fuchs, Sabine M. Hölter, Carsten T. Wotjak, Rainer Landgraf, Martin Hrabé De Angelis, Florian Holsboer, Wolfgang Wurst

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Urocortin 3 (UCN3) is strongly expressed in specific nuclei of the rodent brain, at sites distinct from those expressing urocortin 1 and urocortin 2, the other endogenous ligands of corticotropin-releasing hormone receptor type 2 (CRH-R2). To determine the physiological role of UCN3, we generated UCN3-deficient mice, in which the UCN3 open reading frame was replaced by a tau-lacZ reporter gene. By means of this reporter gene, the nucleus parabrachialis and the premammillary nucleus were identified as previously unknown sites of UCN3 expression. Additionally, the introduced reporter gene enabled the visualization of axonal projections of UCN3-expressing neurons from the superior paraolivary nucleus to the inferior colliculus and from the posterodorsal part of the medial amygdala to the principal nucleus of the bed nucleus of the stria terminalis, respectively. The examination of tau-lacZ reporter gene activity throughout the brain underscored a predominant expression of UCN3 in nuclei functionally connected to the accessory olfactory system. Male and female mice were comprehensively phenotyped but none of the applied tests provided indications for a role of UCN3 in the context of hypothalamic-pituitary-adrenocortical axis regulation, anxiety-or depression-related behavior. However, inspired by the prevalent expression throughout the accessory olfactory system, we identified alterations in social discrimination abilities of male and female UCN3 knock-out mice that were also present in male CRH-R2 knock-out mice. In conclusion, our results suggest a novel role for UCN3 and CRH-R2 related to the processing of social cues and to the establishment of social memories.

Original languageEnglish
Pages (from-to)9103-9116
Number of pages14
JournalJournal of Neuroscience
Volume30
Issue number27
DOIs
StatePublished - 7 Jul 2010

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