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Related Experiment Videos

Coordinate synaptic mechanisms contributing to olfactory cortical adaptation.

Aaron R Best1, Donald A Wilson

  • 1Department of Zoology, University of Oklahoma, Norman, Oklahoma 73019, USA. a_best@ou.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 23, 2004
PubMed
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Neural adaptation in the anterior piriform cortex (aPCX) involves synaptic depression. This study reveals two mechanisms contributing to odor adaptation, modulated by mGluR and beta-adrenergic receptors.

Area of Science:

  • Neuroscience
  • Olfactory system research
  • Synaptic plasticity mechanisms

Background:

  • Anterior piriform cortex (aPCX) neurons exhibit rapid filtering of repetitive odor stimuli.
  • This cortical adaptation is linked to short-term depression of afferent synapses in vivo.
  • Understanding the mechanisms of this neural plasticity is crucial for comprehending olfactory adaptation.

Purpose of the Study:

  • To elucidate the mechanisms underlying nonassociative neural plasticity in the aPCX.
  • To determine the role of synaptic depression in cortical odor adaptation.
  • To investigate the involvement of metabotropic glutamate receptors (mGluR) and beta-adrenergic signaling.

Main Methods:

  • In vivo and in vitro electrophysiological recordings in rat aPCX.

Related Experiment Videos

  • Stimulation of the lateral olfactory tract (LOT) using electrical and odorant methods.
  • Pharmacological manipulation with mGluR II/III antagonists (CPPG) and beta-adrenergic agonists (isoproterenol).

    • Main Results:

    • LOT-evoked synaptic depression in aPCX showed similar onset, time course, and extent in vitro and in vivo.
    • Two distinct mechanisms of activity-dependent synaptic depression were identified: rapid and long-lasting.
    • The long-lasting depression was sensitive to CPPG and isoproterenol, and could be blocked in vivo by CPPG infusion.

    Conclusions:

    • Activity-dependent synaptic depression is a key mechanism for odor adaptation in the aPCX.
    • Both presynaptic depression and mGluR/beta-adrenergic receptor pathways contribute to this adaptation.
    • Targeting these pathways offers potential for modulating olfactory processing.