Abstract
We studied the dynamics of expression of neuronal cell adhesion molecule (NCAM) in the hippocampus of rats trained to perform conditioned active avoidance reaction (CAAR). Using a hard-phase immunoenzyme analysis technique, we quantitatively measured the NCAM content in the membrane fraction of hippocampal tissue and observed a statistically significant increase in this index on the third day and a certain decrease within the second to fourth weeks of the training course. These results confirm the statement that changes in the level of NCAM expression in the hippocampus of experimental animals can be one of the mechanisms providing plastic synaptic modifications in the processes of learning and formation of memory engrams and are also indicative of the important role of the hippocampus in such a formation.
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