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The Journal of Neuroscience, August 15, 2000, 20(16):5906-5914
A Role for the Isoform of Protein Kinase C in Fear
Conditioning
Edwin J.
Weeber1,
Coleen M.
Atkins1,
Joel C.
Selcher1,
Andrew W.
Varga1,
Banafsheh
Mirnikjoo1,
Richard
Paylor1, 2,
Michael
Leitges3, and
J. David
Sweatt1
1 Division of Neuroscience and 2
Department of Molecular and Human Genetics, Baylor College of Medicine,
Houston, Texas 77030, and 3 Institut for Immunbiologie,
Max Planck Institute, 79108 Freiburg, Germany
The protein kinase C family of enzymes has been implicated in
synaptic plasticity and memory in a wide range of animal species, but
to date little information has been available concerning specific roles
for individual isoforms of this category of kinases. To investigate the
role of the isoform of PKC in mammalian learning, we characterized
mice deficient in the PKC gene using anatomical, biochemical,
physiological, and behavioral approaches. In our studies we observed
that PKC was predominantly expressed in the neocortex, in
area CA1 of the hippocampus, and in the basolateral nucleus of the
amygdala. Mice deficient in PKC showed normal brain anatomy and
normal hippocampal synaptic transmission, paired pulse facilitation,
and long-term potentiation and normal sensory and motor responses. The
PKC knock-out animals exhibited a loss of learning, however; they
suffered deficits in both cued and contextual fear conditioning. The
PKC expression pattern and behavioral phenotype in the PKC knock-out
animals indicate a critical role for the isoform of PKC in
learning-related signal transduction mechanisms, potentially in the
basolateral nucleus of the amygdala.
Key words:
PKC; Pavlovian fear conditioning; hippocampus; amygdala; knock-out; mice
Copyright © 2000 Society for Neuroscience 0270-6474/00/20165906-09$05.00/0
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