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gamma Isoform-selective changes in PKC immunoreactivity after trace eyeblink conditioning in the rabbit hippocampus
E A Van der Zee1, M A Kronforst-Collins, E T Maizels
1Department of Cell and Molecular Biology, Northwestern University Medical School, Chicago, Illinois, USA.
Hippocampus
|January 1, 1997
Summary
Protein Kinase C gamma (PKC gamma) is crucial for associative learning in the rabbit hippocampus. This study found increased PKC gamma in conditioned animals, suggesting its role in forming memories.
Area of Science:
- Neuroscience
- Molecular Biology
- Learning and Memory
Background:
- Associative learning relies on synaptic plasticity in the hippocampus.
- Calcium-dependent protein kinase C (PKC) isoforms are implicated in memory formation.
- The specific roles of different PKC isoforms in hippocampal associative learning remain unclear.
Purpose of the Study:
- To identify which Ca(2+)-dependent PKC isoforms are involved in hippocampal associative learning.
- To investigate the role of PKC gamma in trace eyeblink conditioning in rabbits.
Main Methods:
- Immunocytochemistry was used to examine PKC isoform expression in the rabbit hippocampus after trace eyeblink conditioning.
- Behavioral training included conditioned, pseudoconditioned, and naive control groups.
- Antibodies targeting PKC gamma, alpha, beta I, and beta II were employed.
Main Results:
- PKC gamma staining intensity significantly increased in the hippocampus (CA1, CA3, dentate gyrus) of conditioned rabbits 24 hours post-training.
- No significant changes were observed for PKC alpha, beta I, or beta II isoforms.
- Increased PKC gamma immunoreactivity correlated positively with learning performance.
Conclusions:
- PKC gamma is the primary Ca(2+)-dependent PKC isoform involved in the acquisition of associative memories in hippocampal neurons.
- The observed increase in PKC gamma immunoreactivity is likely due to altered protein structure or interactions, not increased protein levels or activity.