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The Journal of Neuroscience, September 15, 2002, 22(18):7892-7902
Regulation of Synaptic Plasticity Genes during Consolidation of Fear Conditioning
Kerry J. Ressler, Gayla Paschall, Xiao-liu Zhou, and Michael Davis Department of Psychiatry and Behavioral Sciences, Center for Behavioral Neuroscience, Emory University School of Medicine, Atlanta, Georgia 30322
In mammals, long-term memory induced by Pavlovian fear conditioning has been shown to be dependent on the amygdala during a protein and mRNA synthesis-dependent phase of memory consolidation. We have used genes identified in a kainic acid model of synaptic plasticity as in situ hybridization probes during the consolidation period after fear conditioning. We found that these genes were transcriptionally regulated in several brain areas only when stimuli were presented in a manner that supported behavioral learning and not after unpaired presentations or footshocks alone. Immediate early genes and neurofilament mRNA peaked ~30 min after conditioning, as expected. Interestingly, nurr-1,
-actinin, and 16c8 increased ~2-4 hr later, whereas neurogranin and gephyrin decreased during that time. Our results suggest that fear memory consolidation occurs within a broad neural circuit that includes, but is not limited to, the amygdala. Together, a broad array of transcriptionally regulated genes, encoding transcription factors, cytoskeletal proteins, adhesion molecules, and receptor stabilization molecules, appear to mediate the neural plasticity underlying specific forms of long-term memory in mammals.
Key words: fear conditioning; learning; consolidation; synaptic plasticity; startle; amygdala
Copyright © 2002 Society for Neuroscience 0270-6474/02/22187892-11$05.00/0
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