Abstract
Rationale
Due to its intrinsic deficiency in prepulse inhibition (PPI), the inbred DBA/2 mouse strain has been considered as an animal model for evaluating antipsychotic drugs. However, the PPI impairment observed in DBA/2 mice relative to the common C57BL/6 strain is confounded by a concomitant reduction in baseline startle reactivity. In this study, we examined the robustness of the PPI deficit when this confound is fully taken into account.
Materials and methods
Male DBA/2 and C57BL/6 mice were compared in a PPI experiment using multiple pulse stimulus intensities, allowing the possible matching of startle reactivity prior to examination of PPI. The known PPI-enhancing effect of the antipsychotic, clozapine, was then evaluated in half of the animals, whilst the other half was subjected to two additional schizophrenia-relevant behavioural tests: latent inhibition (LI) and locomotor reaction to the psychostimulants—amphetamine and phencyclidine.
Results
PPI deficiency in DBA/2 relative to C57BL/6 mice was essentially independent of the strain difference in baseline startle reactivity. Yet, there was no evidence that DBA/2 mice were superior in detecting the PPI-facilitating effect of clozapine when startle difference was balanced. Compared with C57BL/6 mice, DBA/2 mice also showed impaired LI and a different temporal profile in their responses to amphetamine and phencyclidine.
Conclusion
Relative to the C57BL/6 strain, DBA/2 mice displayed multiple behavioural traits relevant to schizophrenia psycho- and physiopathology, indicative of both dopaminergic and glutamatergic/N-methyl-d-aspartic acid receptor dysfunctions. Further examination of their underlying neurobiological differences is therefore warranted in order to enhance the power of this specific inter-strain comparison as a model of schizophrenia.
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Notes
Strictly speaking, this is not a classical double dissociation due to a lack of a common control comparison group against which the DBA/2 and C57BL/6 strains can be compared. Here, DBA/2 mice showed a relative impairment in PPI, whilst C57BL/6 mice exhibited a lack of startle habituation when they were compared with each other.
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Acknowledgments
The present study was supported by the Federal Institute of Technology Zurich and the National Centre of Competence in Research (NCCR): Neural Plasticity and Repair funded by the Swiss National Science Foundation.
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Singer, P., Feldon, J. & Yee, B.K. Are DBA/2 mice associated with schizophrenia-like endophenotypes? A behavioural contrast with C57BL/6 mice. Psychopharmacology 206, 677–698 (2009). https://doi.org/10.1007/s00213-009-1568-6
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DOI: https://doi.org/10.1007/s00213-009-1568-6