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Cytoskeletal organization at the postsynaptic complex

R L Gulley, T S Reese

    The Journal of Cell Biology
    |October 1, 1981
    PubMed
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    Researchers examined postsynaptic densities in guinea pig cochlear nuclei. A meshwork of 4-nm filaments anchors receptors, potentially stabilizing the postsynaptic membrane structure.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Molecular Biology

    Background:

    • Postsynaptic densities (PSDs) are crucial for synaptic transmission.
    • The molecular composition and structural organization of PSDs are not fully elucidated.
    • Understanding PSD structure is key to comprehending synaptic function and plasticity.

    Purpose of the Study:

    • To investigate the ultrastructure of postsynaptic densities and associated cytoskeletal elements.
    • To identify the molecular components and their arrangement within the postsynaptic active zone.
    • To propose a model for how the postsynaptic complex influences receptor anchoring and membrane curvature.

    Main Methods:

    • Deep-etch electron microscopy of unfixed guinea pig anteroventral cochlear nucleus slices.

    Related Experiment Videos

  • High-resolution imaging to visualize fine filament structures within the postsynaptic density.
  • Analysis of filament interconnections and their association with membrane structures.

    • Main Results:

    • Identified a meshwork of 4-nm filaments within the PSD, linked to intramembrane particles at active zones of both excitatory and inhibitory synapses.
    • Observed an underlying lattice of 8- to 9-nm microfilaments, likely F-actin, beneath the PSD.
    • Demonstrated the intermeshing of the 4-nm filament meshwork with the F-actin lattice.

    Conclusions:

    • The 4-nm filament meshwork likely anchors synaptic receptors to the underlying F-actin cytoskeleton.
    • This postsynaptic complex may regulate receptor mobility and maintain postsynaptic membrane curvature.
    • The findings provide insights into the structural basis of synaptic stability and function.