Local calcium-dependent mechanisms determine whether a cut axonal end assembles a retarded endbulb or competent growth cone.

Abstract:

:The transformation of a cut axonal end into a growth cone (GC), after axotomy, is a critical event in the cascade leading to regeneration. In an earlier series of studies we analyzed the cellular cascades that transform a cut axonal end into a competent GC. We found that axotomy of cultured Aplysia neurons leads to a transient elevation of the free intracellular Ca2+ concentration ([Ca2+]i), calpain activation and localized proteolysis of submembranal spectrin. These events are associated with the formation of distinct microtubule (MT) based vesicle traps that accumulate anterogradely transported vesicles that fuse with the spectrin free plasma membrane in support of the growth process (Erez, H., Malkinson, G., Prager-Khoutorsky, M., De Zeeuw, C.I., Hoogenraad, C.C., and Spira, M.E. 2007. Formation of microtubule-based traps controls the sorting and concentration of vesicles to restricted sites of regenerating neurons after axotomy. J. Cell Biol. 176: 497-507.; Erez, H., and Spira, M.E. 2008. Local self-assembly mechanisms underlie the differential transformation of the proximal and distal cut axonal ends into functional and aberrant growth cones. J. Comp. Neurol. 507: spc1.). Here we report that under conditions that limit calcium influx into the cut axonal end, axotomy leads to the formation of endbulbs (EBs) rather than to competent GCs. Under these conditions typical MT based vesicle traps are not formed, and Golgi derived vesicles concentrate at the very tip of the cut axon. Since under these conditions the spectrin barrier is not cleaved, vesicle fusion with the plasma membrane and actin polymerization are retarded and growth processes are impaired. We conclude that the immediate assembly of competent GC or an EB after axotomy is the outcome of autonomous local events that are shaped by the magnitudes of the [Ca2+]i gradients at the site of injury.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Kamber D,Erez H,Spira ME

doi

10.1016/j.expneurol.2009.05.004

subject

Has Abstract

pub_date

2009-09-01 00:00:00

pages

112-25

issue

1

eissn

0014-4886

issn

1090-2430

pii

S0014-4886(09)00185-X

journal_volume

219

pub_type

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