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J Neurosci February 1, 1998; 18 (3): 821-9.

Transport and turnover of microtubules in frog neurons depend on the pattern of axonal growth.

Chang S , Rodionov VI , Borisy GG , Popov SV .

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.

PubMed ID: 9437004
PMC ID: PMC6792771
Article link: J Neurosci
Grant support: [+]

References [+] :
Ahmad, Microtubules released from the neuronal centrosome are transported into the axon. 1995, Pubmed

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