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Prion-like spreading of pathological ?-synuclein in brain.


ABSTRACT: ?-Synuclein is the major component of filamentous inclusions that constitute the defining characteristic of neurodegenerative ?-synucleinopathies. However, the molecular mechanisms underlying ?-synuclein accumulation and spread are unclear. Here we show that intracerebral injections of sarkosyl-insoluble ?-synuclein from brains of patients with dementia with Lewy bodies induced hyperphosphorylated ?-synuclein pathology in wild-type mice. Furthermore, injection of fibrils of recombinant human and mouse ?-synuclein efficiently induced similar ?-synuclein pathologies in wild-type mice. C57BL/6J mice injected with ?-synuclein fibrils developed abundant Lewy body/Lewy neurite-like pathology, whereas mice injected with soluble ?-synuclein did not. Immunoblot analysis demonstrated that endogenous mouse ?-synuclein started to accumulate 3 months after inoculation, while injected human ?-synuclein fibrils disappeared in about a week. These results indicate that ?-synuclein fibrils have prion-like properties and inoculation into wild-type brain induces ?-synuclein pathology in vivo. This is a new mouse model of sporadic ?-synucleinopathy and should be useful for elucidating progression mechanisms and evaluating disease-modifying therapy.

SUBMITTER: Masuda-Suzukake M 

PROVIDER: S-EPMC3613715 | biostudies-literature | 2013 Apr

REPOSITORIES: biostudies-literature

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Prion-like spreading of pathological α-synuclein in brain.

Masuda-Suzukake Masami M   Nonaka Takashi T   Hosokawa Masato M   Oikawa Takayuki T   Arai Tetsuaki T   Akiyama Haruhiko H   Mann David M A DM   Hasegawa Masato M  

Brain : a journal of neurology 20130306 Pt 4


α-Synuclein is the major component of filamentous inclusions that constitute the defining characteristic of neurodegenerative α-synucleinopathies. However, the molecular mechanisms underlying α-synuclein accumulation and spread are unclear. Here we show that intracerebral injections of sarkosyl-insoluble α-synuclein from brains of patients with dementia with Lewy bodies induced hyperphosphorylated α-synuclein pathology in wild-type mice. Furthermore, injection of fibrils of recombinant human and  ...[more]

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