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Related Experiment Videos

Presynaptic facilitation revisited: state and time dependence

J H Byrne1, E R Kandel

  • 1Department of Neurobiology and Anatomy, University of Texas Medical School, Houston 77030, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 15, 1996
PubMed
Summary

Serotonin (5-HT) enhances Aplysia sensory neuron synapses via two pathways: ionic changes and direct release machinery modulation. Protein kinase A (PKA) and protein kinase C (PKC) mediate these effects, with their roles depending on synaptic activity and exposure time.

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Molecular Biology

Background:

  • Short-term presynaptic facilitation enhances neurotransmitter release from sensory neurons.
  • Serotonin (5-HT) is a key modulator of synaptic plasticity.
  • Understanding the molecular mechanisms of 5-HT-induced facilitation is crucial for deciphering memory formation.

Purpose of the Study:

  • To elucidate the distinct mechanisms underlying short-term presynaptic facilitation induced by serotonin (5-HT) in Aplysia sensory neurons.
  • To investigate the roles of protein kinase A (PKA) and protein kinase C (PKC) in mediating these facilitatory effects.
  • To determine how synaptic state and time-dependent factors influence the contributions of PKA and PKC.

Main Methods:

  • Electrophysiological recordings from Aplysia sensory neurons to measure ionic conductances and spike broadening.

Related Experiment Videos

  • Investigation of second-messenger cascades involving PKA and PKC activation.
  • Analysis of the state- and time-dependent effects of 5-HT on synaptic facilitation.

    • Main Results:

    • 5-HT-induced facilitation involves two main mechanisms: spike broadening via K+ current modulation and spike broadening-independent actions on release machinery.
    • PKA primarily mediates facilitation in rested synapses with brief 5-HT exposure, acting through both spike broadening-dependent and -independent pathways.
    • PKC becomes increasingly important in facilitating release from depressed synapses and with prolonged 5-HT exposure, also acting via both mechanisms.

    Conclusions:

    • Synaptic facilitation by 5-HT is mediated by overlapping PKA and PKC pathways, with their relative contributions being state- and time-dependent.
    • The interplay between PKA and PKC allows for flexible expression of synaptic plasticity across different time domains.
    • These findings reveal complex molecular mechanisms underlying short-term memory formation in Aplysia.