Abstract
THE cytoskeleton has an important role in the generation and maintenance of the structure of the axon1,2. Microtubules, neurofilaments and actin, together with various kinds of associated proteins, form highly organized dynamic cytoskeletal structures2–4. Because tubulin and actin molecules are essential cytoskeletal components2 and are transported down the axon5,6, it is important to understand their dynamic behaviour within the axon. Although previous pulse-labelling studies have indicated that the axonal cytoskeleton is a static complex travelling down the axon6, this view has been challenged by the results of several recent experiments7–14. We have now addressed this question by analysing the recovery of fluorescence after photobleaching fluorescent analogues of tubulin and actin in the axons of cultured neurons. We did not observe movement or spreading of bleached zones along the axon, both in neurons injected with fluorescein-labelled tubulin and actin. All bleached zones recovered their fluorescence gradually, however, indicating that microtubules and actin filaments are not static polymers moving forward within the axon, but are dynamic structures that continue to assemble along the length of the axon.
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Okabe, S., Hirokawa, N. Turnover of fluorescently labelled tubulin and actin in the axon. Nature 343, 479–482 (1990). https://doi.org/10.1038/343479a0
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DOI: https://doi.org/10.1038/343479a0
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