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Epidermal Cells Are the Primary Phagocytes in the Fragmentation and Clearance of Degenerating Dendrites in Drosophila

Authors: Han, Chun; Song, Yuanquan; Xiao, Hui; Wang, Denan; Franc, Nathalie C; Jan, Lily Yeh; Jan, Yuh-Nung;

Epidermal Cells Are the Primary Phagocytes in the Fragmentation and Clearance of Degenerating Dendrites in Drosophila

Abstract

During developmental remodeling, neurites destined for pruning often degenerate on-site. Physical injury also induces degeneration of neurites distal to the injury site. Prompt clearance of degenerating neurites is important for maintaining tissue homeostasis and preventing inflammatory responses. Here we show that in both dendrite pruning and dendrite injury of Drosophila sensory neurons, epidermal cells rather than hemocytes are the primary phagocytes in clearing degenerating dendrites. Epidermal cells act via Draper-mediated recognition to facilitate dendrite degeneration and to engulf and degrade degenerating dendrites. Using multiple dendritic membrane markers to trace phagocytosis, we show that two members of the CD36 family, croquemort (crq) and debris buster (dsb), act at distinct stages of phagosome maturation for dendrite clearance. Our finding reveals the physiological importance of coordination between neurons and their surrounding epidermis, for both dendrite fragmentation and clearance.

Keywords

CD36 Antigens, Time Factors, Sensory Receptor Cells, 1.1 Normal biological development and functioning, Neuroscience(all), Genetically Modified, Electron, Scavenger, Animals, Genetically Modified, Microscopy, Electron, Transmission, Phagocytosis, Underpinning research, Receptors, Transmission, Psychology, Animals, Drosophila Proteins, Developmental, Receptors, Scavenger, Microscopy, Neurology & Neurosurgery, Microscopy, Confocal, Biomedical and Clinical Sciences, Neurosciences, Pupa, Gene Expression Regulation, Developmental, Epithelial Cells, Dendrites, Luminescent Proteins, Gene Expression Regulation, Epidermal Cells, Confocal, Larva, Mutation, Nerve Degeneration, Biological psychology, Cognitive Sciences, Drosophila, RNA Interference

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    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    140
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    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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    influence
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    Top 10%
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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 1%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
140
Top 1%
Top 10%
Top 1%
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