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Synaptophysin and synaptoporin expression in the developing rat olfactory system

M Bergmann1, T Schuster, D Grabs

  • 1Institut für Anatomie, Charité, Humboldt-Universität zu Berlin, Germany.

Brain Research. Developmental Brain Research
|August 20, 1993
PubMed
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Synaptophysin and synaptoporin are expressed in rat olfactory neurons, with distinct patterns in primary, secondary, and interneurons. Granule and periglomerular neurons develop these synaptic vesicle proteins postnatally.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Synaptic vesicle proteins like synaptophysin and synaptoporin are crucial for neuronal function.
  • The olfactory system's continuous regeneration and complex circuitry offer a unique model for studying protein expression.
  • Understanding the spatiotemporal expression of these antigens is key to deciphering olfactory system development and function.

Purpose of the Study:

  • To investigate the expression patterns of synaptophysin and synaptoporin in the adult rat olfactory system.
  • To examine the developmental expression of these synaptic vesicle antigens from prenatal to postnatal stages.
  • To elucidate the differential expression of synaptophysin and synaptoporin across various olfactory neuron types.

Main Methods:

Related Experiment Videos

  • Immunocytochemistry was employed to visualize the localization of synaptophysin and synaptoporin.
  • Ultrastructural analysis provided high-resolution details of antigen association with synaptic vesicles.
  • In situ hybridization was used to confirm gene expression patterns during development.

    • Main Results:

    • Both synaptophysin and synaptoporin were detected in olfactory receptor neurons (primary neurons) and their terminals in the olfactory bulb.
    • Tufted neurons (secondary neurons) and interneurons (granule, periglomerular) expressed both antigens, while mitral neurons (secondary neurons) expressed only synaptophysin.
    • Developmental analysis revealed consistent expression patterns in mitral and tufted neurons, but postnatal biosynthesis of both antigens in interneurons.

    Conclusions:

    • Synaptophysin and synaptoporin exhibit distinct expression profiles in different neuronal populations within the rat olfactory system.
    • The postnatal development of synaptophysin and synaptoporin expression in olfactory bulb interneurons suggests a critical role in circuit maturation.
    • These findings contribute to understanding the molecular mechanisms underlying olfactory system development and synaptic vesicle dynamics.