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Related Experiment Videos

Cell specificity of molecular changes during memory storage

D L McPhie1, L D Matzel, J L Olds

  • 1Neural Systems Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20892.

Journal of Neurochemistry
|February 1, 1993
PubMed
Summary
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Protein kinase C (PKC) is crucial for associative learning in Hermissenda nudibranchs. Conditioning increases PKC binding in visual-vestibular neurons, revealing a molecular basis for learning.

Area of Science:

  • Neuroscience
  • Cellular Biology
  • Behavioral Science

Background:

  • The aeolid nudibranch, Hermissenda crassicornis, demonstrates associative learning through Pavlovian conditioning.
  • Protein kinase C (PKC) is hypothesized to be involved in the cellular mechanisms of this conditioned response, particularly in photoreceptor cells.

Purpose of the Study:

  • To investigate learning-specific PKC involvement in the Hermissenda nervous system after Pavlovian conditioning.
  • To identify cellular areas within the visual-vestibular network where PKC activity changes with learning.

Main Methods:

  • Utilized [3H]phorbol-12,13-dibutyrate ([3H]-PDBU), a specific PKC radioligand, to characterize PKC binding in Hermissenda.
  • Employed computerized grain image analysis to determine the cellular localization and binding of PKC.

Related Experiment Videos

  • Assessed changes in PKC binding following Pavlovian conditioning.

    • Main Results:

    • [3H]-PDBU binding demonstrated specificity, saturation, and displacement by diacylglycerol analogues, confirming binding to PKC.
    • PKC binding activity was found equally in cytosol and membrane fractions.
    • Conditioned Hermissenda exhibited significantly increased [3H]-PDBU binding in medial and intermediate B photoreceptors and the optic ganglion.

    Conclusions:

    • The study confirms [3H]-PDBU as a valid ligand for PKC in Hermissenda.
    • Associative learning induces changes in the key signal transduction component, PKC, within identified neurons.
    • This research provides the first evidence of learning-induced alterations in PKC in specific neurons.