期刊
FRONTIERS IN NEUROSCIENCE
卷 15, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fnins.2021.680026
关键词
protein misfolding diseases; amyloid-beta; Alzheimer's disease; alpha-synuclein; Parkinson's disease; oligomers; aminosterols; small molecule drug discovery
资金
- Centre for Misfolding Diseases
- Frances and Augustus Newman Foundation
- Regione Toscana-FAS Salute, project SUPREMAL
- Ministry of Education, Universities and Research of Italy
- Darwin College Cambridge
- Herchel Smith Fund
- Wellcome Trust [203249/Z/16/Z]
- DTRA Service Academy Research Initiative grant [HDTRA1033862]
- Combat Capabilities Development Command Army Research Laboratory
- United States Military Academy
- Gates Cambridge Scholarship
- St. John's College Benefactors' Scholarship
- Wellcome Trust [203249/Z/16/Z] Funding Source: Wellcome Trust
The study reveals the mechanism by which aminosterols modulate the aggregation of Aβ and α-S and suppress their toxicity, indicating that these compounds can inhibit toxicity by displacing toxic oligomeric species from cellular membranes.
The aberrant aggregation of proteins is a key molecular event in the development and progression of a wide range of neurodegenerative disorders. We have shown previously that squalamine and trodusquemine, two natural products in the aminosterol class, can modulate the aggregation of the amyloid-beta peptide (A beta) and of alpha-synuclein (alpha S), which are associated with Alzheimer's and Parkinson's diseases. In this work, we expand our previous analyses to two squalamine derivatives, des-squalamine and alpha-squalamine, obtaining further insights into the mechanism by which aminosterols modulate A beta and alpha S aggregation. We then characterize the ability of these small molecules to alter the physicochemical properties of stabilized oligomeric species in vitro and to suppress the toxicity of these aggregates to varying degrees toward human neuroblastoma cells. We found that, despite the fact that these aminosterols exert opposing effects on A beta and alpha S aggregation under the conditions that we tested, the modifications that they induced to the toxicity of oligomers were similar. Our results indicate that the suppression of toxicity is mediated by the displacement of toxic oligomeric species from cellular membranes by the aminosterols. This study, thus, provides evidence that aminosterols could be rationally optimized in drug discovery programs to target oligomer toxicity in Alzheimer's and Parkinson's diseases.
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