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Related Experiment Videos

Extra-axonal diffusion in the rabbit optic system: a caution in axonal transport studies

J E Haley, H M Wisniewski, R W Ledeen

    Brain Research
    |December 21, 1979
    PubMed
    Summary

    Studying axonal transport using the optic nerve is problematic. Precursors diffuse into surrounding glia, mimicking axonal transport and potentially skewing experimental results.

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Ophthalmology

    Background:

    • Axonal transport is crucial for neuronal function and survival.
    • The optic nerve is often used to study axonal transport due to its accessibility.
    • Previous studies may have overlooked confounding factors in optic nerve research.

    Purpose of the Study:

    • To investigate the validity of using the optic nerve for axonal transport studies.
    • To identify potential artifacts in optic nerve research.
    • To elucidate the fate of radiolabeled precursors injected into the eye.

    Main Methods:

    • Radiolabeling of rabbit eyes with [14C]serine and [3H]glycerol.
    • Intraocular injection of tracers.
    • Colchicine treatment to block axonal transport.

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  • Analysis of radioactivity distribution in the optic nerve and chiasm.
  • Lipid and protein fraction analysis.

    • Main Results:

    • Significant radioactivity rapidly appeared in the optic nerve despite blocked axonal transport.
    • Radioactivity decreased exponentially along the optic chiasm.
    • Labeling occurred in lipid, protein, and acid-soluble fractions.
    • Optic nerve lipids showed labeling patterns distinct from axonally transported lipids, with myelin lipids being significantly labeled.

    Conclusions:

    • Extra-axonal diffusion of precursors into glia, followed by incorporation into glial lipids and proteins (including myelin), confounds optic nerve axonal transport studies.
    • This phenomenon can lead to misinterpretation of experimental data.
    • Researchers should consider glial cell uptake and metabolism when studying axonal transport in the optic nerve.