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Lack of Neuronal IFN-?-IFNAR Causes Lewy Body- and Parkinson's Disease-like Dementia.


ABSTRACT: Neurodegenerative diseases have been linked to inflammation, but whether altered immunomodulation plays a causative role in neurodegeneration is not clear. We show that lack of cytokine interferon-? (IFN-?) signaling causes spontaneous neurodegeneration in the absence of neurodegenerative disease-causing mutant proteins. Mice lacking Ifnb function exhibited motor and cognitive learning impairments with accompanying ?-synuclein-containing Lewy bodies in the brain, as well as a reduction in dopaminergic neurons and defective dopamine signaling in the nigrostriatal region. Lack of IFN-? signaling caused defects in neuronal autophagy prior to ?-synucleinopathy, which was associated with accumulation of senescent mitochondria. Recombinant IFN-? promoted neurite growth and branching, autophagy flux, and ?-synuclein degradation in neurons. In addition, lentiviral IFN-? overexpression prevented dopaminergic neuron loss in a familial Parkinson's disease model. These results indicate a protective role for IFN-? in neuronal homeostasis and validate Ifnb mutant mice as a model for sporadic Lewy body and Parkinson's disease dementia.

SUBMITTER: Ejlerskov P 

PROVIDER: S-EPMC4601085 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature

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Neurodegenerative diseases have been linked to inflammation, but whether altered immunomodulation plays a causative role in neurodegeneration is not clear. We show that lack of cytokine interferon-β (IFN-β) signaling causes spontaneous neurodegeneration in the absence of neurodegenerative disease-causing mutant proteins. Mice lacking Ifnb function exhibited motor and cognitive learning impairments with accompanying α-synuclein-containing Lewy bodies in the brain, as well as a reduction in dopami  ...[more]

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