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Fibrillar form of α-synuclein-specific scFv antibody inhibits α-synuclein seeds induced aggregation and toxicity

Lookup NU author(s): Dr Daniel Erskine

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

Synucleinopathies including Parkinson’s disease (PD), dementia with Lewy bodies (DLB), and multiple system atrophy (MSA) are characterized by pathological accumulation of α-synuclein (α-syn). Amongst the various approaches attempting to tackle the pathological features of synucleinopathies, antibody-based immunotherapy holds much promise. However, the large size of antibodies and corresponding difficulty in crossing the blood-brain barrier has limited development in this area. To overcome this issue, we engineered single-chain variable fragments (scFvs) against fibrillar α-syn, a putative disease-relevant form of α-syn. The purified scFvs showed specific activity towards α-syn fibrils and oligomers in comparison to monomers and recognized intracellular inclusions in human post-mortem brain tissue of Lewy body disease cases, but not aged controls. In vitro studies indicated scFvs inhibit the seeding of α-syn aggregation in a time-dependent manner, decreased α-syn seed-induced toxicity in a cell model of PD, and reduced the production of insoluble α-syn phosphorylated at Ser-129 (pS129-α-syn). These results suggest that our α-syn fibril-specific scFvs recognize α-syn pathology and can inhibit the aggregation of α-syn in vitro and prevent seeding-dependent toxicity. Therefore, the scFvs described here have considerable potential to be utilized towards immunotherapy in synucleinopathies and may also have applications in ante-mortem imaging modalities.


Publication metadata

Author(s): Gupta V, Salim S, Hmila I, Vaikath NN, Sudhakaran IP, Ghanem SS, Majbour NK, Abdulla SA, Emara MM, Abdesselem HB, Lukacsovich T, Erskine D, El-Agnaf OMA

Publication type: Article

Publication status: Published

Journal: Scientific Reports

Year: 2020

Volume: 10

Print publication date: 18/05/2020

Online publication date: 18/05/2020

Acceptance date: 24/04/2020

Date deposited: 24/05/2020

ISSN (electronic): 2045-2322

Publisher: Nature Publishing Group

URL: https://doi.org/10.1038/s41598-020-65035-8

DOI: 10.1038/s41598-020-65035-8

PubMed id: 32424162


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