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Front Psychiatry. 2015 Feb 18;6:13. doi: 10.3389/fpsyt.2015.00013. eCollection 2015.

Schizophrenia and Depression Co-Morbidity: What We have Learned from Animal Models.

Author information

1
Department of Molecular Neuroscience, Centre for Addiction and Mental Health, Campbell Family Mental Health Research Institute , Toronto, ON , Canada ; Department of Pharmacology, Faculty of Medicine, University of Toronto , Toronto, ON , Canada.
2
Department of Molecular Neuroscience, Centre for Addiction and Mental Health, Campbell Family Mental Health Research Institute , Toronto, ON , Canada ; Department of Pharmacology, Faculty of Medicine, University of Toronto , Toronto, ON , Canada ; Department of Psychiatry, Faculty of Medicine, University of Toronto , Toronto, ON , Canada.

Abstract

Patients with schizophrenia are at an increased risk for the development of depression. Overlap in the symptoms and genetic risk factors between the two disorders suggests a common etiological mechanism may underlie the presentation of comorbid depression in schizophrenia. Understanding these shared mechanisms will be important in informing the development of new treatments. Rodent models are powerful tools for understanding gene function as it relates to behavior. Examining rodent models relevant to both schizophrenia and depression reveals a number of common mechanisms. Current models which demonstrate endophenotypes of both schizophrenia and depression are reviewed here, including models of CUB and SUSHI multiple domains 1, PDZ and LIM domain 5, glutamate Delta 1 receptor, diabetic db/db mice, neuropeptide Y, disrupted in schizophrenia 1, and its interacting partners, reelin, maternal immune activation, and social isolation. Neurotransmission, brain connectivity, the immune system, the environment, and metabolism emerge as potential common mechanisms linking these models and potentially explaining comorbid depression in schizophrenia.

KEYWORDS:

animal model; depression; genetics; mouse; schizophrenia

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