Abstract
Previous studies suggest that circulating glucocorticoids may influence the encoding and processing of sensory stimuli. The current study investigated this hypothesis by measuring the generation (amplitude), gating (recovery cycle), and sensitivity (intensity function) of auditory evoked responses in C57BL/6 mice treated with chronic corticosterone (0, 1, 5, 15, or 30 mg/kg/day for 14 days). We found that low-dose corticosterone (5 but not 1 mg/kg/day) enhanced the amplitude and improved gating of evoked potentials without affecting the intensity function. In comparison, higher doses (15 and 30 mg/kg/day) decreased the amplitude and impaired gating of evoked potentials, also without altering the stimulus intensity function. At all doses, lower amplitudes of evoked potentials were significantly correlated with higher circulating corticosterone levels. These data highlight the need to consider serum glucocorticoid levels when assessing human disease states associated with aberrations of information processing such as schizophrenia and depression.
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Acknowledgements
This work was supported by Eli Lilly and Co. (SJS), P50 MH 6404501 (SJS, TA, SJK) and The Stanley Medical Research Institute (SJS). We thank Dr Irwin Lucki, Dr Rita Valentino, Dr Karen Stevens, and Dr Raquel Gur for helpful comments and discussions during the formulation of this manuscript.
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Maxwell, C., Ehrlichman, R., Liang, Y. et al. Corticosterone Modulates Auditory Gating in Mouse. Neuropsychopharmacol 31, 897–903 (2006). https://doi.org/10.1038/sj.npp.1300879
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DOI: https://doi.org/10.1038/sj.npp.1300879
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