| Hemispheric differences in protein kinase C betaII levels in the rat amygdala: baseline asymmetry and lateralized changes associated with cue and context in a classical fear conditioning paradigm. | |
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MedLine Citation:
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PMID: 17118565 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The amygdala is critically important for fear learning, and specific kinases have been implicated as contributors to the mechanisms that underlie learning. We examined levels of protein kinase C betaII (PKC betaII) in the left and right lateral and basolateral nuclei (LA/BLA) of the amygdala from animals that were classically fear conditioned with tones as cues and footshocks. Groups consisted of animals that received neither tones nor shocks, paired tones and shocks, or unpaired tones and shocks. At 1 h after conditioning, some animals from each group were used for biochemical measurements of PKC betaII levels and other animals were given probe trials to assess freezing behavior to cue and context. The levels of PKC betaII were greater in the left hemisphere in animals receiving neither tones nor shocks and animals receiving paired tones and shocks. PKC betaII levels were greater in the right hemisphere of animals receiving randomly presented tones and shocks. Freezing times to cue were long (>80% of probe trial time) in both the paired tone/shock and randomly unpaired tone/shock groups. Freezing times to context were long in the unpaired tone/shock group, but not the paired tone/shock group. Correlational analyses showed that freezing times to context, but not cue, precisely predicted the right/left relation of PKC betaII levels in the LA/BLA: the greater the time spent freezing to context, the greater the increase in right hemisphere PKC betaII levels. We conclude that fear conditioning causes hemisphere and input specific increases in PKC betaII in the rat LA/BLA. |
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Authors:
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R Orman; M Stewart |
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Publication Detail:
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Type: Journal Article Date: 2006-11-22 |
Journal Detail:
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Title: Neuroscience Volume: 144 ISSN: 0306-4522 ISO Abbreviation: Neuroscience Publication Date: 2007 Feb |
Date Detail:
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Created Date: 2007-01-01 Completed Date: 2007-04-11 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 7605074 Medline TA: Neuroscience Country: United States |
Other Details:
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Languages: eng Pagination: 797-807 Citation Subset: IM |
Affiliation:
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Program in Neural and Behavioral Science, Department of Physiology and Pharmacology, State University of New York, Downstate Medical Center, 450 Clarkson Avenue, Box 31, Brooklyn, NY 11203, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Amygdala / enzymology* Animals Avoidance Learning / physiology Conditioning (Psychology) / physiology* Cues* Electric Stimulation Fear / physiology* Functional Laterality / physiology* Male Protein Kinase C / metabolism* Rats Rats, Sprague-Dawley Up-Regulation |
| Grant Support | |
ID/Acronym/Agency:
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R21 NS045160-02/NS/NINDS NIH HHS |
| Chemical | |
Reg. No./Substance:
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EC 2.7.1.-/protein kinase C beta; EC 2.7.11.13/Protein Kinase C |
| Comments/Corrections | |
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