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Cell-adhesion molecules in memory formation

R Schmidt1

  • 1Department of Zoology, Johann-Wolgang-Goethe-University, Frankfurt/Main, Germany.

Behavioural Brain Research
|January 23, 1995
PubMed
Summary
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Ependymin, a protein in the central nervous system (CNS), is crucial for memory consolidation in goldfish. Its synthesis and polymerization are regulated by hormones and metal cations, impacting synaptic efficacy and behavioral plasticity.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Memory consolidation is a critical process in the central nervous system (CNS) following learning.
  • This consolidation phase is vulnerable to interference from inhibitors of transcription and translation.
  • Ependymin, a CNS glycoprotein, plays a specific role in memory consolidation.

Purpose of the Study:

  • To investigate the role of ependymin in memory consolidation in goldfish.
  • To elucidate the regulatory mechanisms of ependymin synthesis and function in behavioral plasticity.

Main Methods:

  • Active shock-avoidance conditioning in goldfish.
  • Induction of ependymin messenger RNA (mRNA) in meningeal fibroblasts.
  • Synthesis and secretion of ependymin.

Related Experiment Videos

  • Intracranial injections of anti-ependymin antisera and antisense oligodeoxynucleotides.
  • In vitro studies on ependymin's effect on central axon growth.
  • In situ studies on ependymin's role in neuronal regeneration.

    • Main Results:

    • Active shock-avoidance conditioning rapidly induces ependymin mRNA in goldfish.
    • De novo synthesized ependymin molecules are essential for memory consolidation.
    • Ependymin directs central axon growth in vitro and participates in neuronal regeneration in situ via its HNK-1 epitope.
    • Hormones regulate ependymin synthesis post-learning.
    • Local metal cation concentrations may polymerize ependymin at activated synapses.

    Conclusions:

    • Ependymin is a key molecule in memory consolidation and behavioral plasticity in goldfish.
    • Two regulatory mechanisms control ependymin function: hormonal control of synthesis and metal cation-mediated polymerization at synapses.
    • Ependymin's cell adhesion properties are critical for its role in neuronal plasticity and regeneration.