Department of Neurobiology
Developmental Neuroscience | Neuroscience and Neurobiology
Most glial functions depend on establishing intimate morphological relationships with neurons. Significant progress has been made in understanding neuron-glia signaling at synaptic and axonal contacts, but how glia support neuronal cell bodies is unclear. Here we explored the growth and functions of Drosophila cortex glia (which associate almost exclusively with neuronal cell bodies) to understand glia-soma interactions. We show that cortex glia tile with one another and with astrocytes to establish unique central nervous system (CNS) spatial domains that actively restrict glial growth, and selective ablation of cortex glia causes animal lethality. In an RNAi-based screen, we identified alphaSNAP (soluble NSF [N-ethylmalemeide-sensitive factor] attachment protein alpha) and several components of vesicle fusion and recycling machinery as essential for the maintenance of cortex glial morphology and continued contact with neurons. Interestingly, loss of the secreted neurotrophin Spatzle 3 (Spz3) phenocopied alphaSNAP phenotypes, which included loss of glial ensheathment of neuron cell bodies, increased neuronal cell death, and defects in animal behavior. Rescue experiments suggest that Spz3 can exert these effects only over very short distances. This work identifies essential roles for glial ensheathment of neuronal cell bodies in CNS homeostasis as well as Spz3 as a novel signaling factor required for maintenance of cortex glial morphology and neuron-glia contact.
Drosophila, cortex glia, glia, neurotrophin, spz3, αSNAP
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© 2017 Coutinho-Budd et al.; Published by Cold Spring Harbor Laboratory Press. This article is distributed exclusively by Cold Spring Harbor Laboratory Press for the first six months after the full-issue publication date (see http://genesdev.cshlp.org/site/misc/terms.xhtml). After six months, it is available under a Creative Commons License (Attribution-NonCommercial 4.0 International), as described at http://creativecommons.org/licenses/by-nc/4.0/.
DOI of Published Version
Genes Dev. 2017 Oct 15;31(20):2023-2038. doi: 10.1101/gad.305888.117. Epub 2017 Nov 14. Link to article on publisher's site
Genes and development
Coutinho-Budd JC, Sheehan AE, Freeman MR. (2017). The secreted neurotrophin Spatzle 3 promotes glial morphogenesis and supports neuronal survival and function. Neurobiology Publications. https://doi.org/10.1101/gad.305888.117. Retrieved from https://escholarship.umassmed.edu/neurobiology_pp/219
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License