title: Histones facilitate α-synuclein aggregation during neuronal apoptosis.
abstract: Ample in vitro and in vivo experimental evidence supports the hypothesis that intercellular transmission of α-synuclein (αS) is a mechanism underlying the spread of αS pathology in Parkinson's disease and related disorders. What remains unexplained is where and how initial transmissible αS aggregates form. In a previous study, we demonstrated that αS aggregates rapidly form in neurons with impaired nuclear membrane integrity due to the interaction between nuclear proaggregant factor(s) and αS and that such aggregates may serve as a source for αS seeding. In the present study, we identify histones as a potential nuclear proaggregant factor for αS aggregation in both apoptotic neurons and brains with αS pathology. We further demonstrate that histone-induced aggregates contain a range of αS oligomers, including protofibrils and mature fibrils, and that these αS aggregates can seed additional aggregation. Importantly, we demonstrate transmissibility in mouse brains from stereotaxic injection. This study provides new clues to the mechanism underlying initial pathological aggregation of αS in PD and related disorders, and could lead to novel diagnostic and therapeutic approaches.
authors.affiliation: Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32224, USA. Jiang.peizhou@mayo.edu.
authors.forename: Peizhou
authors.initials: P
authors.lastname: Jiang
authors.affiliation: Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32224, USA.|Department of Laboratory Medicine and Pathology, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32224, USA.
authors.forename: Ming
authors.initials: M
authors.lastname: Gan
authors.affiliation: Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32224, USA.
authors.forename: Shu-Hui
authors.initials: SH
authors.lastname: Yen
authors.affiliation: Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32224, USA.
authors.forename: Pamela J
authors.initials: PJ
authors.lastname: McLean
authors.affiliation: Department of Neuroscience, Mayo Clinic, 4500 San Pablo Road, Jacksonville, FL, 32224, USA. dickson.dennis@mayo.edu.
authors.forename: Dennis W
authors.initials: DW
authors.lastname: Dickson
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000502:physiology*; D015153:Blotting, Western; D001921:Brain / Q000378:metabolism / Q000473:pathology; D045744:Cell Line, Tumor; D003593:Cytoplasm / Q000378:metabolism / Q000473:pathology; D005455:Fluorescent Antibody Technique; D006657:Histones / Q000378:metabolism*; D006801:Humans; D047468:Immunoprecipitation; D020961:Lewy Body Disease / Q000378:metabolism / Q000473:pathology; D008810:Mice, Inbred C57BL; D018613:Microscopy, Confocal; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D009474:Neurons / Q000378:metabolism* / Q000473:pathology; D066263:Protein Aggregation, Pathological / Q000378:metabolism* / Q000473:pathology; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D051844:alpha-Synuclein / Q000235:genetics / Q000378:metabolism*
chemical_list: D006657:Histones; D011994:Recombinant Proteins; C497604:SNCA protein, human; D051844:alpha-Synuclein
keywords: Aggregation; Apoptosis; Histone; Nuclear membrane integrity; Parkinson’s disease; Proaggregant nuclear factors; α-synuclein