title: Effect of acute stressor and serotonin transporter genotype on amygdala first wave transcriptome in mice.
abstract: The most prominent brain region evaluating the significance of external stimuli immediately after their onset is the amygdala. Stimuli evaluated as being stressful actuate a number of physiological processes as an immediate stress response. Variation in the serotonin transporter gene has been associated with increased anxiety- and depression-like behavior, altered stress reactivity and adaptation, and pathophysiology of stress-related disorders. In this study the instant reactions to an acute stressor were measured in a serotonin transporter knockout mouse model. Mice lacking the serotonin transporter were verified to be more anxious than their wild-type conspecifics. Genome-wide gene expression changes in the amygdala were measured after the mice were subjected to control condition or to an acute stressor of one minute exposure to water. The dissection of amygdalae and stabilization of RNA was conducted within nine minutes after the onset of the stressor. This extremely short protocol allowed for analysis of first wave primary response genes, typically induced within five to ten minutes of stimulation, and was performed using Affymetrix GeneChip Mouse Gene 1.0 ST Arrays. RNA profiling revealed a largely new set of differentially expressed primary response genes between the conditions acute stress and control that differed distinctly between wild-type and knockout mice. Consequently, functional categorization and pathway analysis indicated genes related to neuroplasticity and adaptation in wild-types whereas knockouts were characterized by impaired plasticity and genes more related to chronic stress and pathophysiology. Our study therefore disclosed different coping styles dependent on serotonin transporter genotype even directly after the onset of stress and accentuates the role of the serotonergic system in processing stressors and threat in the amygdala. Moreover, several of the first wave primary response genes that we found might provide promising targets for future therapeutic interventions of stress-related disorders also in humans.
authors.affiliation: Department of Psychiatry, University of Muenster, Muenster, Germany.
authors.forename: Christa
authors.initials: C
authors.lastname: Hohoff
authors.forename: Ali
authors.initials: A
authors.lastname: Gorji
authors.forename: Sylvia
authors.initials: S
authors.lastname: Kaiser
authors.forename: Edith
authors.initials: E
authors.lastname: Willscher
authors.forename: Eberhard
authors.initials: E
authors.lastname: Korsching
authors.forename: Oliver
authors.initials: O
authors.lastname: Ambrée
authors.forename: Volker
authors.initials: V
authors.lastname: Arolt
authors.forename: Klaus-Peter
authors.initials: KP
authors.lastname: Lesch
authors.forename: Norbert
authors.initials: N
authors.lastname: Sachser
authors.forename: Jürgen
authors.initials: J
authors.lastname: Deckert
authors.forename: Lars
authors.initials: L
authors.lastname: Lewejohann
mesh_terms: D000679:Amygdala / Q000378:metabolism*; D000818:Animals; D016000:Cluster Analysis; D019295:Computational Biology / Q000379:methods; D003345:Corticosterone / Q000097:blood; D030541:Databases, Genetic; D020869:Gene Expression Profiling; D005838:Genotype; D008297:Male; D018782:Maze Learning; D051379:Mice; D018345:Mice, Knockout; D058977:Molecular Sequence Annotation; D015203:Reproducibility of Results; D050486:Serotonin Plasma Membrane Transport Proteins / Q000235:genetics*; D015398:Signal Transduction; D013315:Stress, Psychological / Q000235:genetics*; D059467:Transcriptome
chemical_list: D050486:Serotonin Plasma Membrane Transport Proteins; D003345:Corticosterone
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