期刊
JOURNAL OF CELL BIOLOGY
卷 191, 期 1, 页码 211-223出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.201006039
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资金
- National Science Foundation [IOS-0842701]
- National Institutes of Health [NS069844, DA020812]
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [0842701] Funding Source: National Science Foundation
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.
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