Lani C Keller, Ling Cheng, Cody J Locke, Martin Müller, Richard D Fetter, Graeme W Davis
Department of Biochemistry and Biophysics, University of California, San Francisco, 1550 4th Street, Rock Hall 4th Floor North, San Francisco, CA 94143, USA.
Neuron 2011 Dec 8We provide evidence for a prodegenerative, glial-derived signaling framework in the Drosophila neuromuscular system that includes caspase and mitochondria-dependent signaling. We demonstrate that Drosophila TNF-α (eiger) is expressed in a subset of peripheral glia, and the TNF-α receptor (TNFR), Wengen, is expressed in motoneurons. NMJ degeneration caused by disruption of the spectrin/ankyrin skeleton is suppressed by an eiger mutation or by eiger knockdown within a subset of peripheral glia. Loss of wengen in motoneurons causes a similar suppression providing evidence for glial-derived prodegenerative TNF-α signaling. Neither JNK nor NFκβ is required for prodegenerative signaling. However, we provide evidence for the involvement of both an initiator and effector caspase, Dronc and Dcp-1, and mitochondrial-dependent signaling. Mutations that deplete the axon and nerve terminal of mitochondria suppress degeneration as do mutations in Drosophila Bcl-2 (debcl), a mitochondria-associated protein, and Apaf-1 (dark), which links mitochondrial signaling with caspase activity in other systems. Copyright © 2011 Elsevier Inc. All rights reserved.
Lani C Keller, Ling Cheng, Cody J Locke, Martin Müller, Richard D Fetter, Graeme W Davis. Glial-derived prodegenerative signaling in the Drosophila neuromuscular system. Neuron. 2011 Dec 8;72(5):760-75
PMID: 22153373
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