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Transport complexes associated with slow axonal flow

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Abstract

Cytoskeletal proteins-neurofilament polypeptides, tubulin and actin-are transported along axons by slow transport. How or in what form they are transported is not known. One hypothesis is that they are assembled into the cytoskeleton at the cell body and transported as intact polymers down the axon. However, recent radiolabeling and photobleaching studies have shown that tubulin and actin exist in both a mobile phase and a stationary phase in the axon. Consequently, it is more likely that cytoskeletal proteins move along the axon in some form of transport complex and are assembled into a cytoskeleton which is stationary. In this overview we discuss these topics and consider the evidence for the existence of transport complexes associated with slow axonal flow. Such evidence includes the slow transport of particulate complexes containing tubulin and neurofilament polypeptides along reconstituted microtubules in vitro, and the coordinate slow transport of actin with actin-binding in vivo.

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Authors and Affiliations

  1. The Neuroscience Centre and Department of Physiology, University of Otago Medical School, P.O. Box 913, Dunedin, New Zealand

    John J. Bray & Roland G. Mills

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Special issue dedicated to Dr. Lawrence Austin.

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Bray, J.J., Mills, R.G. Transport complexes associated with slow axonal flow. Neurochem Res 16, 645–649 (1991). https://doi.org/10.1007/BF00965550

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