Abstract
ELISA measurements showed that brain extracellular fluid (ECF) levels of ependymin decreased for animals that learned to associate a paired presentation of a light stimulus (CS) with the onset of an electric shock (US), whereas no changes were obtained for control goldfish that received the same number of stimuli delivered in a random unpaired order. Studies of the time course of the changes showed an immediate decrease (19%) after training followed by an increase (20%) above baseline by 5 h and a final return to baseline by 25 h. These data extend the findings of previous experiments, which demonstrated a role for ependymin in two training procedures that involved motor learning, to classical conditioning where no motor learning occurs. Thus it appears that ependymin may have a functional role in molecular mechanisms of learning and memory in general.
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