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Related Experiment Videos

Dopamine depresses synaptic inputs into the olfactory bulb.

A Y Hsia1, J D Vincent, P M Lledo

  • 1Centre National de la Recherche Scientifique, Institut Alfred Fessard, 91198 Gif-sur-Yvette, France.

Journal of Neurophysiology
|August 13, 1999
PubMed
Summary
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Dopamine significantly depresses synaptic transmission in the olfactory bulb by activating D2 receptors. This finding reveals dopamine

Area of Science:

  • Neuroscience
  • Olfactory System
  • Neurotransmission

Background:

  • Dopaminergic transmission disorders and molecular studies suggest dopamine's role in olfaction.
  • The precise mechanisms of dopamine's influence on olfactory processing remain incompletely understood.

Purpose of the Study:

  • To investigate the role of dopamine receptor activation in modulating synaptic transmission within the olfactory bulb.
  • To identify the specific dopamine receptor subtype involved and its site of action.

Main Methods:

  • Electrophysiological recordings in the olfactory bulb.
  • Application of dopamine receptor agonists and antagonists.
  • Assessment of synaptic transmission and paired-pulse modulation.

Main Results:

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  • Dopamine receptor activation significantly depressed synaptic transmission between olfactory receptor neurons and mitral cells.
  • This effect was mediated by the D2 dopamine receptor subtype.
  • The depression occurred presynaptically and was independent of ongoing synaptic activity.

Conclusions:

  • This study provides the first evidence for direct dopaminergic control over inputs to the main olfactory bulb.
  • Dopamine, via D2 receptors, modulates olfactory sensory information processing at the earliest synaptic relay.
  • These findings highlight significant roles for dopamine in regulating odorant detection and perception.