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Related Experiment Videos

Zinc-enriched (ZEN) terminals in mouse olfactory bulb.

S M Jo1, M H Won, T B Cole

  • 1Department of Neurobiology, Institute of Anatomy, University of Aarhus, DK-8000, Aarhus, Denmark.

Brain Research
|May 24, 2000
PubMed
Summary
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This study maps zinc-enriched (ZEN) terminals in the mouse olfactory bulb using ZnT3 immunocytochemistry and zinc autometallography. ZEN terminals synapse with granule cells, periglomerular cells, and mitral/tufted cells, suggesting roles in olfactory processing.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Neuroanatomy

Background:

  • Zinc is a crucial trace element involved in various neuronal functions.
  • Zinc-enriched (ZEN) terminals are implicated in neurotransmission but their precise localization in the olfactory bulb is not fully understood.

Purpose of the Study:

  • To precisely localize ZEN terminals within the mouse olfactory bulb.
  • To investigate the cellular and synaptic targets of ZEN terminals.

Main Methods:

  • ZnT3 immunocytochemistry (ICC) was employed to detect the zinc transporter ZnT3.
  • Zinc autometallography (AMG) was used to visualize zinc deposits.
  • Correlative light and electron microscopy were utilized for ultrastructural analysis.

Main Results:

Related Experiment Videos

  • ZnT3 staining patterns strongly correlated with AMG staining, confirming their co-localization.
  • ZEN terminals were identified in the granule cell layer and olfactory glomerular layer.
  • Ultrastructurally, ZEN terminals formed asymmetrical synapses with dendrites and somata of granule cells, periglomerular cells, and mitral/tufted cells.

Conclusions:

  • Two primary sources of ZEN terminals exist in the olfactory bulb: centrifugal fibers and olfactory receptor terminals.
  • ZEN terminals likely play a significant role in modulating olfactory information processing, potentially via glutamatergic pathways.