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2016 ; 36
(11
): 3170-83
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Defective Phagocytic Corpse Processing Results in Neurodegeneration and Can Be
Rescued by TORC1 Activation
#MMPMID26985028
Etchegaray JI
; Elguero EJ
; Tran JA
; Sinatra V
; Feany MB
; McCall K
J Neurosci
2016[Mar]; 36
(11
): 3170-83
PMID26985028
show ga
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 of Drosophila 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 STATEMENT: Previously, 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 fly
Drosophila 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.