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© The Rockefeller University Press, 0021-9525/1998//1077 $5.00
The Journal of Cell Biology, Volume 143, Number 4, , 1998 1077-1086

Dynamics of Axonal Microtubules Regulate the Topology of New Membrane Insertion into the Growing Neurites

Department of Physiology and Biophysics, University of Illinois at Chicago, Chicago, Illinois 60612

Nerve growth depends on the delivery of cell body–synthesized material to the growing neuronal processes. The cellular mechanisms that determine the topology of new membrane addition to the axon are not known. Here we describe a technique to visualize the transport and sites of exocytosis of cell body– derived vesicles in growing axons. We found that in Xenopus embryo neurons in culture, cell body–derived vesicles were rapidly transported all the way down to the growth cone region, where they fused with the plasma membrane. Suppression of microtubule (MT) dynamic instability did not interfere with the delivery of new membrane material to the growth cone region; however, the insertion of vesicles into the plasma membrane was dramatically inhibited. Local disassembly of MTs by focal application of nocodazole to the middle axonal segment resulted in the addition of new membrane at the site of drug application. Our results suggest that the local destabilization of axonal MTs is necessary and sufficient for the delivery of membrane material to specific neuronal sites.

Key Words: exocytosis • axon • microtubule • dynamic instability • diffusion

Abbreviations used in this paper: DiIC₁₂, 1,1'-didodecyl-3,3,3',3'-tetramethylindocarbocyanide; MT, microtubule.

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