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2018 ; 14
(ä): 250-260
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Complement receptor 3 mediates NADPH oxidase activation and dopaminergic
neurodegeneration through a Src-Erk-dependent pathway
#MMPMID28978491
Hou L
; Wang K
; Zhang C
; Sun F
; Che Y
; Zhao X
; Zhang D
; Li H
; Wang Q
Redox Biol
2018[Apr]; 14
(ä): 250-260
PMID28978491
show ga
Microglial NADPH oxidase (Nox2) plays a key role in chronic neuroinflammation and
related dopaminergic neurodegeneration in Parkinson's disease (PD). However, the
mechanisms behind Nox2 activation remain unclear. Here, we revealed the critical
role of complement receptor 3 (CR3), a microglia-specific pattern recognition
receptor, in Nox2 activation and subsequent dopaminergic neurodegeneration by
using paraquat and maneb-induced PD model. Suppression or genetic deletion of CR3
impeded paraquat and maneb-induced activation of microglial Nox2, which was
associated with attenuation of dopaminergic neurodegeneration. Mechanistic
inquiry revealed that blocking CR3 reduced paraquat and maneb-induced membrane
translocation of Nox2 cytosolic subunit p47(phox), an essential step for Nox2
activation. Src and Erk (extracellular regulated protein kinases) were
subsequently recognized as the downstream signals of CR3. Moreover, inhibition of
Src or Erk impaired Nox2 activation in response to paraquat and maneb
co-exposure. Finally, we found that CR3-deficient mice were more resistant to
paraquat and maneb-induced Nox2 activation and nigral dopaminergic
neurodegeneration as well as motor dysfunction than the wild type controls. Taken
together, our results showed that CR3 regulated Nox2 activation and dopaminergic
neurodegeneration through a Src-Erk-dependent pathway in a two pesticide-induced
PD model, providing novel insights into the immune pathogenesis of PD.