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2014 ; 10
(10
): 1761-75
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Autophagy in microglia degrades extracellular ?-amyloid fibrils and regulates the
NLRP3 inflammasome
#MMPMID25126727
Cho MH
; Cho K
; Kang HJ
; Jeon EY
; Kim HS
; Kwon HJ
; Kim HM
; Kim DH
; Yoon SY
Autophagy
2014[Oct]; 10
(10
): 1761-75
PMID25126727
show ga
Accumulation of ?-amyloid (A?) and resultant inflammation are critical
pathological features of Alzheimer disease (AD). Microglia, a primary immune cell
in brain, ingests and degrades extracellular A? fibrils via the lysosomal system.
Autophagy is a catabolic process that degrades native cellular components,
however, the role of autophagy in A? degradation by microglia and its effects on
AD are unknown. Here we demonstrate a novel role for autophagy in the clearance
of extracellular A? fibrils by microglia and in the regulation of the A?-induced
NLRP3 (NLR family, pyrin domain containing 3) inflammasome using microglia
specific atg7 knockout mice and cell cultures. We found in microglial cultures
that A? interacts with MAP1LC3B-II via OPTN/optineurin and is degraded by an
autophagic process mediated by the PRKAA1 pathway. We anticipate that enhancing
microglial autophagy may be a promising new therapeutic strategy for AD.
|*Autophagy
[MESH]
|AMP-Activated Protein Kinases/metabolism
[MESH]
|Adaptor Proteins, Signal Transducing/metabolism
[MESH]