Protein turnover of the Wallenda/DLK kinase regulates a retrograde response to axonal injury

Xin Xiong, Xin Wang, Ronny Ewanek, Pavan Bhat, Aaron DiAntonio, Catherine A. Collins

Research output: Contribution to journalArticle

173 Scopus citations

Abstract

Regenerative responses to axonal injury involve changes in gene expression; however, little is known about how such changes can be induced from a distant site of injury. In this study, we describe a nerve crush assay in Drosophila melanogaster to study injury signaling and regeneration mechanisms. We find that Wallenda (Wnd), a conserved mitogen-activated protein kinase (MAPK) kinase kinase homologous to dual leucine zipper kinase, functions as an upstream mediator of a cell-autonomous injury signaling cascade that involves the c-Jun NH2-terminal kinase MAPK and Fos transcription factor. Wnd is physically transported in axons, and axonal transport is required for the injury signaling mechanism. Wnd is regulated by a conserved E3 ubiquitin ligase, named Highwire (Hiw) in Drosophila. Injury induces a rapid increase in Wnd protein concomitantly with a decrease in Hiw protein. In hiw mutants, injury signaling is constitutively active, and neurons initiate a faster regenerative response. Our data suggest that the regulation of Wnd protein turnover by Hiw can function as a damage surveillance mechanism for responding to axonal injury.

Original languageEnglish
Pages (from-to)211-223
Number of pages13
JournalJournal of Cell Biology
Volume191
Issue number1
DOIs
StatePublished - Oct 4 2010

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