Corticosterone modulates auditory gating in mouse.
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.
Maxwell
Christina R
CR
Division of Neuropsychiatry, Department of Psychiatry, University of Pennsylvania, Philadelphia, PA 19104, USA.
Ehrlichman
Richard S
RS
Liang
Yuling
Y
Gettes
David R
DR
Evans
Dwight L
DL
Kanes
Stephen J
SJ
Abel
Ted
T
Karp
Jonathan
J
Siegel
Steven J
SJ
D000818:Animals; D000893:Anti-Inflammatory Agents / Q000097:blood / Q000494:pharmacology; D001306:Auditory Pathways / Q000187:drug effects* / Q000502:physiology; D001309:Auditory Threshold / Q000187:drug effects* / Q000502:physiology; D001921:Brain / Q000187:drug effects* / Q000502:physiology; D003345:Corticosterone / Q000097:blood / Q000494:pharmacology*; D003866:Depressive Disorder / Q000097:blood / Q000150:complications / Q000503:physiopathology; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D005072:Evoked Potentials, Auditory / Q000187:drug effects / Q000502:physiology; D007805:Language Development Disorders / Q000097:blood / Q000209:etiology / Q000503:physiopathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009433:Neural Inhibition / Q000187:drug effects* / Q000502:physiology; D012559:Schizophrenia / Q000097:blood / Q000150:complications / Q000503:physiopathology
D000893:Anti-Inflammatory Agents; D003345:Corticosterone