Defective Phagocytic Corpse Processing Results in Neurodegeneration and Can Be Rescued by TORC1 Activation
Defective Phagocytic Corpse Processing Results in Neurodegeneration and Can Be Rescued by TORC1 Activation
The removal of apoptotic cell corpses is important for maintaining homeostasis. Previously, defects in apoptotic cell clearance have been linked to neurodegeneration. However, the mechanisms underlying this are still poorly understood. In this study, we report that the absence of the phagocytic receptor Draper in glia leads to a pronounced accumulation of apoptotic neurons in the brain ofDrosophila melanogaster. These dead cells persist in the brain throughout the lifespan of the organism and are associated with age-dependent neurodegeneration. Our data indicate that corpses persist because of defective phagosome maturation, rather than recognition defects. TORC1 activation, or inhibition of Atg1, in glia is sufficient to rescue corpse accumulation as well as neurodegeneration. These results suggest that phagocytosis of apoptotic neurons by glia during development is essential for brain homeostasis in adult flies. Furthermore, it suggests that TORC1 regulates Draper-mediated phagosome maturation.SIGNIFICANCE STATEMENTPreviously, defects in dead cell clearance were linked to neurodegeneration, but the exact mechanisms are not well understood. In this study, we report that the absence of an engulfment receptor leads to a pronounced accumulation of dead neurons in the brain of the fruit flyDrosophila melanogaster. These dead cells persist in the brain throughout the lifespan of the organism and are associated with age-dependent neurodegeneration. Our data indicate that corpses persist because of defective degradation of cells rather than recognition of dead cells.
- Brigham and Women's Faulkner Hospital United States
- Boston College United States
- Boston University United States
Psychology and cognitive sciences, Caenorhabditis elegans proteins, Embryo, Nonmammalian, Apoptosis, Neurology & neurosurgery, Animals, Genetically Modified, RNA interference, Membrane proteins, Apoptotic cells, Drosophila Proteins, Disease, Eukaryotic Initiation Factors, Eukaryotic initiation factors, Gene expression regulation, Medical and health sciences, Neurons, Rett-syndrome, Engulfment receptor draper, Adult Drosophila, Age Factors, Brain, genetically modified, Death, Drosophila melanogaster, Embryo, Larva, Clearance, Drosophila, RNA Interference, Neuroglia, Age factors, Cell death, 570, Neurosciences & neurology, Drosophila proteins, Phagocytosis, nonmammalian, Glia, Autophagy, Transcription factors, Animals, Neurodegeneration, Nerve degeneration, Caenorhabditis elegans Proteins, Neurosciences, Membrane Proteins, Life sciences & biomedicine, Gene Expression Regulation, Nerve Degeneration, Science & technology, Phagosome maturation, Transcription Factors
Psychology and cognitive sciences, Caenorhabditis elegans proteins, Embryo, Nonmammalian, Apoptosis, Neurology & neurosurgery, Animals, Genetically Modified, RNA interference, Membrane proteins, Apoptotic cells, Drosophila Proteins, Disease, Eukaryotic Initiation Factors, Eukaryotic initiation factors, Gene expression regulation, Medical and health sciences, Neurons, Rett-syndrome, Engulfment receptor draper, Adult Drosophila, Age Factors, Brain, genetically modified, Death, Drosophila melanogaster, Embryo, Larva, Clearance, Drosophila, RNA Interference, Neuroglia, Age factors, Cell death, 570, Neurosciences & neurology, Drosophila proteins, Phagocytosis, nonmammalian, Glia, Autophagy, Transcription factors, Animals, Neurodegeneration, Nerve degeneration, Caenorhabditis elegans Proteins, Neurosciences, Membrane Proteins, Life sciences & biomedicine, Gene Expression Regulation, Nerve Degeneration, Science & technology, Phagosome maturation, Transcription Factors
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