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The Journal of Neuroscience, February 1, 1998, 18(3):821-829

Transport and Turnover of Microtubules in Frog Neurons Depend on the Pattern of Axonal Growth

Sunghoe Chang¹, Vladimir I. Rodionov², Gary G. Borisy², and Sergey V. Popov¹

¹ Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois 60612, and ² Laboratory of Molecular Biology, University of Wisconsin, Madison, Wisconsin 53076

The transport of axonal microtubules in growing neurites has been a controversial issue because of clear but conflicting results obtained with fluorescence-marking techniques. We have attempted to resolve the discordance via analysis of the relationship between apparent microtubule translocation and cell adhesion. Neuronal cultures were prepared from Xenopus embryos 1 d after injection of Cy3-conjugated tubulin into one of the blastomeres of two-cell-stage embryos. Anterograde translocation of axonal microtubules was observed in neurons cultured on a laminin-coated surface, in agreement with previously published data for Xenopus embryonic neurons. However, when neuronal cultures were prepared on a concanavalin A-treated surface, the axonal microtubules were stationary, as reported for all other neurons investigated previously. Neuronal cultures prepared on laminin- and concanavalin A-coated surfaces also demonstrated dramatic differences in the pattern of axonal growth, dynamics of axonal microtubules, and response to brefeldin A treatment. Our findings suggest that transport and dynamics of axonal microtubules may be directly affected by the mechanical tension produced by growth cone activity.

Key words: tubulin; slow axonal transport; microtubules; photobleaching; neuronal cultures; mechanical tension

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Copyright © 1998 Society for Neuroscience  0270-6474/98/183821-09$05.00/0

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