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Neural mechanisms underlying stress resilience in Ahi1 knockout mice: relevance to neuropsychiatric disorders

Molecular Psychiatry volume 19, pages 243–252 (2014)Cite this article

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Abstract

The Abelson helper integration site 1 (AHI1) gene has a pivotal role in brain development. Studies by our group and others have demonstrated association of AHI1 with schizophrenia and autism. To elucidate the mechanism whereby alteration in AHI1 expression may be implicated in the pathogenesis of neuropsychiatric disorders, we studied Ahi1 heterozygous knockout (Ahi1+/−) mice. Although their performance was not different from wild-type mice on tests that model classical schizophrenia-related endophenotypes, Ahi1+/− mice displayed an anxiolytic-like phenotype across different converging modalities. Using behavioral paradigms that involve exposure to environmental and social stress, significantly decreased anxiety was evident in the open field, elevated plus maze and dark–light box, as well as during social interaction in pairs. Assessment of core temperature and corticosterone secretion revealed a significantly blunted response of the autonomic nervous system and the hypothalamic–pituitary–adrenal axis in Ahi1+/− mice exposed to environmental and visceral stress. However, response to centrally acting anxiogenic compounds was intact. On resting-state functional MRI, connectivity of the amygdala with other brain regions involved in processing of anxiogenic stimuli and inhibitory avoidance learning, such as the lateral entorhinal cortex, ventral hippocampus and ventral tegmental area, was significantly reduced in the mutant mice. Taken together, our data link Ahi1 under-expression with a defect in the process of threat detection. Alternatively, the results could be interpreted as representing an anxiety-related endophenotype, possibly granting the Ahi1+/− mouse relative resilience to various types of stress. The current knockout model highlights the contribution of translational approaches to understanding the genetic basis of emotional regulation and its associated neurocircuitry, with possible relevance to neuropsychiatric disorders.

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Acknowledgements

This work was supported in part by a grant from the Israel Science Foundation (to BL). We thank Dr A Rigbi for his assistance in the statistical analysis of the data.

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  1. A Lotan and T Lifschytz: These authors contributed equally to this work.

Authors and Affiliations

  1. Biological Psychiatry Laboratory, Hadassah-Hebrew University Medical Center, Jerusalem, Israel

    A Lotan, T Lifschytz, A Slonimsky, E C Broner, L Greenbaum & B Lerer

  2. Cardiovascular Research Center, Hadassah-Hebrew University Medical Center, Jerusalem, Israel

    S Abedat

  3. Department of Pathology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel

    Y Fellig

  4. Anxiety and Stress Research Unit, Ben-Gurion University of the Negev, Beersheba, Israel

    H Cohen

  5. MRI Lab, Medical Biophysics, Hadassah-Hebrew University Medical Center, Jerusalem, Israel

    O Lory & G Goelman

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  1. A Lotan
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Lotan, A., Lifschytz, T., Slonimsky, A. et al. Neural mechanisms underlying stress resilience in Ahi1 knockout mice: relevance to neuropsychiatric disorders. Mol Psychiatry 19, 243–252 (2014). https://doi.org/10.1038/mp.2013.123

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