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Polyphenolic Biflavonoids Inhibit Amyloid-Beta Fibrillation and Disaggregate Preformed Amyloid-Beta Fibrils

Biomolecules & Therapeutics 2020년 28권 2호 p.145 ~ 151
 ( Choi Erika Y. ) - A.T. Still University of Health Sciences Department of Pharmacology

강삼식 ( Kang Sam-Sik ) - Seoul National University College of Pharmacy
이상국 ( Lee Sang-Kook ) - Seoul National University College of Pharmacy
 ( Han Byung-Hee ) - A.T. Still University of Health Sciences Department of Pharmacology

Abstract


Alzheimer’s disease (AD) is a devastating neurodegenerative disease and a major cause of dementia in elderly individuals worldwide. Increased deposition of insoluble amyloid β (Aβ) fibrils in the brain is thought be a key neuropathological hallmark of AD. Many recent studies show that natural products such as polyphenolic flavonoids inhibit the formation of insoluble Aβ fibrils and/or destabilize β-sheet-rich Aβ fibrils to form non-cytotoxic aggregates. In the present study, we explored the structure-activity relationship of naturally-occurring biflavonoids on Aβ amyloidogenesis utilizing an in vitro thioflavin T assay with Aβ1-42 peptide which is prone to aggregate more rapidly to fibrils than Aβ1-40 peptide. Among the biflavonoids we tested, we found amentoflavone revealed the most potent effects on inhibiting Aβ1-42 fibrillization (IC50: 0.26 μM), as well as on disassembling preformed Aβ1-42 fibrils (EC50: 0.59 μM). Our structure-activity relationship study suggests that the hydroxyl groups of biflavonoid compounds play an essential role in their molecular interaction with the dynamic process of Aβ1-42 fibrillization. Our atomic force microscopic imaging analysis demonstrates that amentoflavone directly disrupts the fibrillar structure of preformed Aβ1-42 fibrils, resulting in conversion of those fibrils to amorphous Aβ1-42 aggregates. These results indicate that amentoflavone affords the most potent anti-amyloidogenic effects on both inhibition of Aβ1-42 fibrillization and disaggregation of preformed mature Aβ1-42 fibrils.

키워드

Alzheimer’s disease; Amyloid β (Aβ); Fibrillization; Disaggregation; Structure-activity relationship; Biflavonoids
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