Sunday Driver links axonal transport to damage signaling.
Neurons transmit long-range biochemical signals between cell bodies and distant axonal sites or termini. To test the hypothesis that signaling molecules are hitchhikers on axonal vesicles, we focused on the c-Jun NH2-terminal kinase (JNK) scaffolding protein Sunday Driver (syd), which has been proposed to link the molecular motor protein kinesin-1 to axonal vesicles. We found that syd and JNK3 are present on vesicular structures in axons, are transported in both the anterograde and retrograde axonal transport pathways, and interact with kinesin-I and the dynactin complex. Nerve injury induces local activation of JNK, primarily within axons, and activated JNK and syd are then transported primarily retrogradely. In axons, syd and activated JNK colocalize with p150Glued, a subunit of the dynactin complex, and with dynein. Finally, we found that injury induces an enhanced interaction between syd and dynactin. Thus, a mobile axonal JNK-syd complex may generate a transport-dependent axonal damage surveillance system.
Cavalli
Valeria
V
Department of Cellular and Molecular Medicine, Howard Hughes Medical Institute, University of California, San Diego, La Jolla, CA 92093, USA.
Kujala
Pekka
P
Klumperman
Judith
J
Goldstein
Lawrence S B
LS
D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D001369:Axons / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism*; D029721:Drosophila Proteins / Q000378:metabolism*; D000072159:Dynactin Complex; D005455:Fluorescent Antibody Technique; D008565:Membrane Proteins / Q000378:metabolism*; D051379:Mice; D008869:Microtubule-Associated Proteins / Q000378:metabolism; D048057:Mitogen-Activated Protein Kinase 10 / Q000378:metabolism*; D009419:Nerve Tissue Proteins; D021381:Protein Transport / Q000502:physiology; D012584:Sciatic Nerve / Q000293:injuries / Q000378:metabolism / Q000601:surgery; D015398:Signal Transduction / Q000502:physiology*
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D029721:Drosophila Proteins; D000072159:Dynactin Complex; C403619:Mapk8ip3 protein, mouse; D008565:Membrane Proteins; D008869:Microtubule-Associated Proteins; D009419:Nerve Tissue Proteins; C417671:syd protein, Drosophila; D048057:Mitogen-Activated Protein Kinase 10
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