title: Effects of neonatal excitotoxic lesions in ventral thalamus on social interaction in the rat.
abstract: The role of the thalamus in schizophrenia has increasingly been studied in recent years. Deficits in the ventral thalamus have been described in only few postmortem and neuroimaging studies. We utilised our previously introduced neurodevelopmental animal model, the neonatal excitotoxic lesion of the ventral thalamus of Sprague-Dawley rats (Wolf et al., Pharmacopsychiatry 43:99-109, 22). At postnatal day (PD7), male pubs received bilateral thalamic infusions with ibotenic acid (IBA) or artificial cerebrospinal fluid (control). In adulthood, social interaction of two animals not familiar to each other was studied by a computerised video tracking system. This study displays clear lesion effects on social interaction of adult male rats. The significant reduction of total contact time and the significant increase in distance between the animals in the IBA group compared to controls can be interpreted as social withdrawal modelling a negative symptom of schizophrenia. The significant increase of total distance travelled in the IBA group can be hypothesised as agitation modelling a positive symptom of schizophrenia. Using a triple concept of social interaction, the percentage of no social interaction (Non-SI%) was significantly larger, and inversely, the percentage of passive social interaction (SI-passive%) was significantly smaller in the IBA group when compared to controls. In conclusion, on the background of findings in schizophrenic patients, the effects of neonatal ventral thalamic IBA lesions in adult male rats support the hypothesis of face and construct validity as animal model of schizophrenia.
authors.affiliation: Department of Psychiatry, Ruhr-University Bochum, Alexandrinenstr. 1, 44791, Bochum, Germany. rainer.wolf@rub.de.|Department of Psychiatry, Otto-von-Guericke University, Magdeburg, Germany. rainer.wolf@rub.de.
authors.forename: Rainer
authors.identifier: http://orcid.org/0000-0003-1080-7871
authors.initials: R
authors.lastname: Wolf
authors.affiliation: Department of Psychiatry, Otto-von-Guericke University, Magdeburg, Germany.
authors.forename: Henrik
authors.initials: H
authors.lastname: Dobrowolny
authors.affiliation: Institute of Anatomy, Otto-von-Guericke University, Magdeburg, Germany.
authors.forename: Sven
authors.initials: S
authors.lastname: Nullmeier
authors.affiliation: Department of Psychiatry, Otto-von-Guericke University, Magdeburg, Germany.
authors.forename: Bernhard
authors.initials: B
authors.lastname: Bogerts
authors.affiliation: Institute of Anatomy, Otto-von-Guericke University, Magdeburg, Germany.
authors.forename: Herbert
authors.initials: H
authors.lastname: Schwegler
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001522:Behavior, Animal / Q000187:drug effects*; D018690:Excitatory Amino Acid Agonists / Q000633:toxicity*; D007051:Ibotenic Acid / Q000633:toxicity*; D008297:Male; D009043:Motor Activity / Q000187:drug effects; D051381:Rats; D017207:Rats, Sprague-Dawley; D012919:Social Behavior; D020651:Ventral Thalamic Nuclei / Q000187:drug effects*
chemical_list: D018690:Excitatory Amino Acid Agonists; D007051:Ibotenic Acid
keywords: Ibotenic acid; Rat; Schizophrenia; Social interaction; Ventral thalamus; Video tracking