Signaling mechanisms regulating Wallerian degeneration

UMMS Affiliation

Department of Neurobiology; Freeman Lab

Publication Date


Document Type



Neuroscience and Neurobiology


Wallerian degeneration (WD) occurs after an axon is cut or crushed and entails the disintegration and clearance of the severed axon distal to the injury site. WD was initially thought to result from the passive wasting away of the distal axonal fragment, presumably because it lacked a nutrient supply from the cell body. The discovery of the slow Wallerian degeneration (Wld(s)) mutant mouse, in which distal severed axons survive intact for weeks rather than only one to two days, radically changed our thoughts on the autonomy of axon survival. Wld(s) taught us that under some conditions the axonal compartment can survive for weeks after axotomy without a cell body. The phenotypic and molecular characterization of Wld(S) and current models for Wld(S) molecular function are reviewed herein-the mechanism(s) by which Wld(S) spares severed axons remains unresolved. However, recent studies inspired by Wld(s) have led to the identification of the first 'axon death' signaling molecules whose endogenous activities promote axon destruction during WD.

DOI of Published Version



Curr Opin Neurobiol. 2014 Aug;27:224-31. doi: 10.1016/j.conb.2014.05.001. Epub 2014 Jun 5. Link to article on publisher's site

Journal/Book/Conference Title

Current opinion in neurobiology

Related Resources

Link to Article in PubMed

PubMed ID