title: Independent pathways downstream of the Wnd/DLK MAPKKK regulate synaptic structure, axonal transport, and injury signaling.
abstract: Mitogen-activated protein (MAP) kinase signaling cascades orchestrate diverse cellular activities with common molecular players. To achieve specific cellular outcomes in response to specific signals, scaffolding proteins play an important role. Here we investigate the role of the scaffolding protein JNK interacting protein-1 (JIP1) in neuronal signaling by a conserved axonal MAP kinase kinase kinase, known as Wallenda (Wnd) in Drosophila and dual leucine kinase (DLK) in vertebrates and Caenorhabditis elegans. Recent studies in multiple model organisms suggest that Wnd/DLK regulates both regenerative and degenerative responses to axonal injury. Here we report a new role for Wnd in regulating synaptic structure during development, which implies that Wnd is also active in uninjured neurons. This synaptic role of Wnd can be functionally separated from the role of Wnd in axonal regeneration and injury signaling by the requirement for the JIP1 scaffold and the p38b MAP kinase. JIP1 mediates the synaptic function of Wnd via p38, which is not required for injury signaling or new axonal growth after injury. Our results indicate that Wnd regulates multiple independent pathways in Drosophila motoneurons and that JIP1 scaffolds a specific downstream cascade required for the organization of presynaptic microtubules during synaptic development.
authors.affiliation: Department of Molecular Cellular and Developmental Biology, University of Michigan, Ann Arbor, Michigan 48109-1048, USA.
authors.forename: Susan
authors.initials: S
authors.lastname: Klinedinst
authors.forename: Xin
authors.initials: X
authors.lastname: Wang
authors.forename: Xin
authors.initials: X
authors.lastname: Xiong
authors.forename: Jill M
authors.initials: JM
authors.lastname: Haenfler
authors.forename: Catherine A
authors.initials: CA
authors.lastname: Collins
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism; D000818:Animals; D030801:Animals, Genetically Modified; D001370:Axonal Transport / Q000235:genetics / Q000502:physiology*; D004330:Drosophila; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism*; D006735:Horseradish Peroxidase / Q000378:metabolism; D007814:Larva; D020930:MAP Kinase Kinase Kinases / Q000235:genetics / Q000378:metabolism*; D020935:MAP Kinase Signaling System / Q000502:physiology*; D008297:Male; D009046:Motor Neurons / Q000166:cytology; D009154:Mutation / Q000235:genetics; D009419:Nerve Tissue Proteins / Q000378:metabolism; D009469:Neuromuscular Junction / Q000378:metabolism*; D059348:Peripheral Nerve Injuries / Q000378:metabolism* / Q000473:pathology
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D029721:Drosophila Proteins; D009419:Nerve Tissue Proteins; D006735:Horseradish Peroxidase; D020930:MAP Kinase Kinase Kinases; C090757:mitogen-activated protein kinase kinase kinase 12; C512899:wnd protein, Drosophila
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