TY  - JOUR
A1  - Waider, J
A1  - Popp, S
A1  - Lange, MD
A1  - Kern, R
A1  - Kolter, JF
A1  - Kobler, J
A1  - Donner, NC
A1  - Lowe, KR
A1  - Malzbender, JH
A1  - Brazell, CJ
A1  - Arnold, MR
A1  - Aboagye, B
A1  - Schmitt-Böhrer, A
A1  - Lowry, CA
A1  - Pape, HC
A1  - Lesch, KP
T1  - Genetically driven brain serotonin deficiency facilitates panic-like escape behavior in mice
JF  - Translational Psychiatry
N2  - Multiple lines of evidence implicate brain serotonin (5-hydroxytryptamine; 5-HT) system dysfunction in the pathophysiology of stressor-related and anxiety disorders. Here we investigate the influence of constitutively deficient 5-HT synthesis on stressor-related anxiety-like behaviors using Tryptophan hydroxylase 2 (Tph2) mutant mice. Functional assessment of c-Fos after associated foot shock, electrophysiological recordings of GABAergic synaptic transmission, differential expression of the Slc6a4 gene in serotonergic neurons were combined with locomotor and anxiety-like measurements in different contextual settings. Our findings indicate that constitutive Tph2 inactivation and consequential lack of 5-HT synthesis in Tph2 null mutant mice (Tph2\(^{-/-}\)) results in increased freezing to associated foot shock and a differential c-Fos activity pattern in the basolateral complex of the amygdala. This is accompanied by altered GABAergic transmission as observed by recordings of inhibitory postsynaptic currents on principal neurons in the basolateral nucleus, which may explain increased fear associated with hyperlocomotion and escape-like responses in aversive inescapable contexts. In contrast, lifelong 5-HT deficiency as observed in Tph2 heterozygous mice (Tph\(^{+/-}\)) is able to be compensated through reduced GABAergic transmission in the basolateral nucleus of the amygdala based on Slc6a4 mRNA upregulation in subdivisions of dorsal raphe neurons. This results in increased activity of the basolateral nucleus of the amygdala due to associated foot shock. In conclusion, our results reflect characteristic syndromal dimensions of panic disorder and agoraphobia. Thus, constitutive lack of 5-HT synthesis influence the risk for anxiety- and stressor-related disorders including panic disorder and comorbid agoraphobia through the absence of GABAergic-dependent compensatory mechanisms in the basolateral nucleus of the amygdala.
KW  - anxiety
KW  - stress
KW  - serotonin
KW  - genetics
KW  - mice
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-170239
VL  - 7
IS  - e1246
ER  - 
TY  - JOUR
A1  - Rivero, O
A1  - Selten, MM
A1  - Sich, S
A1  - Popp, S
A1  - Bacmeister, L
A1  - Amendola, E
A1  - Negwer, M
A1  - Schubert, D
A1  - Proft, F
A1  - Kiser, D
A1  - Schmitt, AG
A1  - Gross, C
A1  - Kolk, SM
A1  - Strekalova, T
A1  - van den Hove, D
A1  - Resink, TJ
A1  - Kasir, N Nadif
A1  - Lesch, KP
T1  - Cadherin-13, a risk gene for ADHD and comorbid disorders, impacts GABAergic function in hippocampus and cognition
JF  - Translational Psychiatry
N2  - Cadherin-13 (CDH13), a unique glycosylphosphatidylinositol-anchored member of the cadherin family of cell adhesion molecules, has been identified as a risk gene for attention-deficit/hyperactivity disorder (ADHD) and various comorbid neurodevelopmental and psychiatric conditions, including depression, substance abuse, autism spectrum disorder and violent behavior, while the mechanism whereby CDH13 dysfunction influences pathogenesis of neuropsychiatric disorders remains elusive. Here we explored the potential role of CDH13 in the inhibitory modulation of brain activity by investigating synaptic function of GABAergic interneurons. Cellular and subcellular distribution of CDH13 was analyzed in the murine hippocampus and a mouse model with a targeted inactivation of Cdh13 was generated to evaluate how CDH13 modulates synaptic activity of hippocampal interneurons and behavioral domains related to psychopathologic (endo) phenotypes. We show that CDH13 expression in the cornu ammonis (CA) region of the hippocampus is confined to distinct classes of interneurons. Specifically, CDH13 is expressed by numerous parvalbumin and somatostatin-expressing interneurons located in the stratum oriens, where it localizes to both the soma and the presynaptic compartment. Cdh13\(^{-/-}\) mice show an increase in basal inhibitory, but not excitatory, synaptic transmission in CA1 pyramidal neurons. Associated with these alterations in hippocampal function, Cdh13\(^{-/-}\) mice display deficits in learning and memory. Taken together, our results indicate that CDH13 is a negative regulator of inhibitory synapses in the hippocampus, and provide insights into how CDH13 dysfunction may contribute to the excitatory/inhibitory imbalance observed in neurodevelopmental disorders, such as ADHD and autism.
KW  - genome-wide association
KW  - deficit hyperactivity disorder
KW  - psychiatric disorders
KW  - neurodevelopmental disorders
KW  - synaptic plasticity
KW  - response inhibition
KW  - positive interneurons
KW  - T-cadherin
KW  - long-term potentiation
KW  - attention deficit/hyperactivity disorder
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-145218
VL  - 5
IS  - e655
ER  -