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Neurodegeneration by activation of the microglial complement-phagosome pathway.


ABSTRACT: Systemic inflammatory reactions have been postulated to exacerbate neurodegenerative diseases via microglial activation. We now demonstrate in vivo that repeated systemic challenge of mice over four consecutive days with bacterial LPS maintained an elevated microglial inflammatory phenotype and induced loss of dopaminergic neurons in the substantia nigra. The same total cumulative LPS dose given within a single application did not induce neurodegeneration. Whole-genome transcriptome analysis of the brain demonstrated that repeated systemic LPS application induced an activation pattern involving the classical complement system and its associated phagosome pathway. Loss of dopaminergic neurons induced by repeated systemic LPS application was rescued in complement C3-deficient mice, confirming the involvement of the complement system in neurodegeneration. Our data demonstrate that a phagosomal inflammatory response of microglia is leading to complement-mediated loss of dopaminergic neurons.

SUBMITTER: Bodea LG 

PROVIDER: S-EPMC6608212 | biostudies-literature | 2014 Jun

REPOSITORIES: biostudies-literature

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Neurodegeneration by activation of the microglial complement-phagosome pathway.

Bodea Liviu-Gabriel LG   Wang Yiner Y   Linnartz-Gerlach Bettina B   Kopatz Jens J   Sinkkonen Lasse L   Musgrove Ruth R   Kaoma Tony T   Muller Arnaud A   Vallar Laurent L   Di Monte Donato A DA   Balling Rudi R   Neumann Harald H  

The Journal of neuroscience : the official journal of the Society for Neuroscience 20140601 25


Systemic inflammatory reactions have been postulated to exacerbate neurodegenerative diseases via microglial activation. We now demonstrate in vivo that repeated systemic challenge of mice over four consecutive days with bacterial LPS maintained an elevated microglial inflammatory phenotype and induced loss of dopaminergic neurons in the substantia nigra. The same total cumulative LPS dose given within a single application did not induce neurodegeneration. Whole-genome transcriptome analysis of  ...[more]

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