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Junctional ultrastructure in isolated synaptic membranes.

A I Matus, B B Walters, D H Jones

    Journal of Neurocytology
    |June 1, 1975
    PubMed
    Summary
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    Ultrastructure analysis reveals both Type 1 and Type 2 synaptic junctions in isolated brain membranes. Isolated Type 1 junctions show dense subunits, differing from intact tissue structures.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Biochemistry

    Background:

    • Synaptic junctions are crucial for neuronal communication.
    • Understanding their ultrastructure is key to deciphering synaptic function.
    • Previous studies have focused on intact tissue, with limited data on isolated preparations.

    Purpose of the Study:

    • To compare the ultrastructure of synaptic junctions in whole brain tissue versus isolated synaptic membranes.
    • To identify and characterize different types of synaptic junctions in isolated membrane preparations.
    • To elucidate the structural organization of isolated synaptic junctions.

    Main Methods:

    • Comparative ultrastructural analysis of synaptic junctions.
    • Isolation of synaptic membranes and synaptosomes from brain tissue.

    Related Experiment Videos

  • Transmission electron microscopy (TEM) for high-resolution imaging.

    • Main Results:

    • Type 1 junctions, identified by postsynaptic densities, are present in isolated membranes.
    • Presynaptic dense projections observed in intact tissue are absent in isolated Type 1 junctions.
    • Type 2 junctions are less distinct but identifiable in isolated preparations; junctions lacking dense material are also observed.
    • Isolated Type 1 junctions exhibit a unique structure of 200 Å dense-staining subunits within the postsynaptic thickening and cleft.

    Conclusions:

    • Both Type 1 and Type 2 synaptic junctions are likely present in isolated synaptic membrane preparations.
    • The ultrastructural differences observed between intact tissue and isolated membranes provide insights into junctional stability and composition.
    • The dense-staining subunits in isolated Type 1 junctions suggest a specific molecular organization of the postsynaptic apparatus.