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Regional differences in the neuronal cytoskeleton.

P F Drake, R J Lasek

    The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
    |May 1, 1984
    PubMed
    Summary
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    Giant Aplysia neurons exhibit distinct cytoskeletal protein compositions in cell bodies versus axons. Neurofilament proteins are more abundant in axons, while tubulin properties differ, suggesting specialized networks.

    Area of Science:

    • Neuroscience
    • Cell Biology
    • Molecular Biology

    Background:

    • The neuronal cytoskeleton is crucial for cell structure and function.
    • Understanding regional differences in cytoskeletal composition is key to deciphering neuronal organization.

    Purpose of the Study:

    • To investigate regional variations in cytoskeletal protein composition between Aplysia neuron cell bodies and axons.
    • To compare the biochemical properties of cytoskeletal elements in different neuronal compartments.

    Main Methods:

    • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to analyze protein composition.
    • Biochemical labeling with [125I]Bolton-Hunter reagent.
    • Triton X-100 extraction to isolate stable cytoskeletal proteins.
    • Electron microscopy for correlative structural analysis.

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    Main Results:

    • Neurofilament proteins (NF60 and NF65) were 5 times more abundant in axons than in cell bodies.
    • Actin and tubulin levels were comparable between cell bodies and axons.
    • The ratio of NF60 to NF65 differed, with cell bodies having proportionally more NF60.
    • Tubulin exhibited different solubility properties in cell bodies compared to axons.

    Conclusions:

    • Aplysia neurons possess at least two distinct cytoskeletal networks.
    • One network is specialized for the cell body, and another is specific to the axon.
    • These regional specializations likely support distinct cellular functions in different neuronal compartments.