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Wefers, B. ; Hitz, C. ; Hölter, S.M. ; Trümbach, D. ; Hansen, J. ; Weber, P.* ; Pütz, B.* ; Deussing, J.M.* ; Hrabě de Angelis, M. ; Roenneberg, T.* ; Zheng, F.* ; Alzheimer, C.* ; Silva, A.* ; Wurst, W. ; Kühn, R.

MAPK signaling determines anxiety in the juvenile mouse brain but depression-like behavior in adults.

PLoS ONE 7:e35035 (2012)

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MAP kinase signaling has been implicated in brain development, long-term memory, and the response to antidepressants. Inducible Braf knockout mice, which exhibit protein depletion in principle forebrain neurons, enabled us to unravel a new role of neuronal MAPK signaling for emotional behavior. Braf mice that were induced during adulthood showed normal anxiety but increased depression-like behavior, in accordance with pharmacological findings. In contrast, the inducible or constitutive inactivation of Braf in the juvenile brain leads to normal depression-like behavior but decreased anxiety in adults. In juvenile, constitutive mutants we found no alteration of GABAergic neurotransmission but reduced neuronal arborization in the dentate gyrus. Analysis of gene expression in the hippocampus revealed nine downregulated MAPK target genes that represent candidates to cause the mutant phenotype.Our results reveal the differential function of MAPK signaling in juvenile and adult life phases and emphasize the early postnatal period as critical for the determination of anxiety in adults. Moreover, these results validate inducible gene inactivation as a new valuable approach, allowing it to discriminate between gene function in the adult and the developing postnatal brain.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords HIPPOCAMPAL CA1 AREA; B-RAF; POSTNATAL ONTOGENESIS; SYNAPTIC PLASTICITY; PATHWAY; GENE; SYSTEM; STRESS; EXPRESSION; NEURONS

ISSN (print) / ISBN 1932-6203

Journal PLoS ONE

Quellenangaben Volume: 7, Issue: 4, Article Number: e35035

Publisher Public Library of Science (PLoS)

Publishing Place Lawrence, Kan.

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Developmental Genetics (IDG)
CCG Molecular Neurogenetics (IDG-KMN)
Institute of Experimental Genetics (IEG)