Journal article
MICE EXPRESSING CONSTITUTIVELY ACTIVE Gsα EXHIBIT STIMULUS ENCODING DEFICITS SIMILAR TO THOSE OBSERVED IN SCHIZOPHRENIA PATIENTS
Neuroscience, Vol.141(3), pp.1257-1264
09/01/2006
DOI: 10.1016/j.neuroscience.2006.04.028
PMCID: PMC3311921
PMID: 16750890
Abstract
People with schizophrenia display sensory encoding deficits across a broad range of electrophysiological and behavioral measures, suggesting fundamental impairments in the ability to transduce the external environment into coherent neural representations. This inability to create basic components of complex stimuli interferes with a high fidelity representation of the world and likely contributes to cognitive deficits. The current study evaluates the effects of constitutive forebrain activation of the G
s
α G-protein subunit on auditory threshold and gain using acoustic brainstem responses and cortically generated N40 event-related potentials to assess the role of cyclic AMP signaling in sensory encoding. Additionally, we examine the ability of pharmacological treatments that mimic (amphetamine) or ameliorate (haloperidol) positive symptoms of schizophrenia to test the hypothesis that the encoding deficits observed in G
s
α transgenic mice can be normalized with treatment. We find that G
s
α transgenic mice have decreased amplitude of cortically generated N40 but normal acoustic brainstem response amplitude, consistent with forebrain transgene expression and a schizophrenia endophenotype. Transgenic mice also display decreased stimulus intensity response (gain) in both acoustic brainstem response and N40, indicating corticofugal influence on regions that lack transgene expression. N40 deficits in transgenic animals were ameliorated with low dose haloperidol and reversed with higher dose, suggesting dopamine D
2
receptor-linked G
i
activity contributes to the impairment. Consistent with this hypothesis, we recreated the G
s
α transgenic deficit in wild type animals using the indirect dopamine agonist amphetamine. This transgenic model of sensory encoding deficits provides a foundation for identifying biochemical contributions to sensory processing impairments associated with schizophrenia.
Details
- Title: Subtitle
- MICE EXPRESSING CONSTITUTIVELY ACTIVE Gsα EXHIBIT STIMULUS ENCODING DEFICITS SIMILAR TO THOSE OBSERVED IN SCHIZOPHRENIA PATIENTS
- Creators
- C. R MAXWELL - Division of Neuropsychiatry, Department of Psychiatry, University of Pennsylvania, Translational Research Laboratories, Room 2223, 125 South 31st Street, Philadelphia, PA 19104, USAY LIANG - Division of Neuropsychiatry, Department of Psychiatry, University of Pennsylvania, Translational Research Laboratories, Room 2223, 125 South 31st Street, Philadelphia, PA 19104, USAM. P KELLY - Division of Neuropsychiatry, Department of Psychiatry, University of Pennsylvania, Translational Research Laboratories, Room 2223, 125 South 31st Street, Philadelphia, PA 19104, USAS. J KANES - Division of Neuropsychiatry, Department of Psychiatry, University of Pennsylvania, Translational Research Laboratories, Room 2223, 125 South 31st Street, Philadelphia, PA 19104, USAT ABEL - Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USAS. J SIEGEL - Division of Neuropsychiatry, Department of Psychiatry, University of Pennsylvania, Translational Research Laboratories, Room 2223, 125 South 31st Street, Philadelphia, PA 19104, USA
- Resource Type
- Journal article
- Publication Details
- Neuroscience, Vol.141(3), pp.1257-1264
- DOI
- 10.1016/j.neuroscience.2006.04.028
- PMID
- 16750890
- PMCID
- PMC3311921
- ISSN
- 0306-4522
- eISSN
- 1873-7544
- Grant note
- P50 MH064045-01 || MH / National Institute of Mental Health : NIMH
- Language
- English
- Date published
- 09/01/2006
- Academic Unit
- Molecular Physiology and Biophysics; Psychiatry; Psychological and Brain Sciences; Iowa Neuroscience Institute; Neuroscience and Pharmacology; Biochemistry and Molecular Biology
- Record Identifier
- 9984065836402771
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