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Inhibition of tau aggregation and associated cytotoxicity on neuron-like cells by calycosin.

Abstract：

:In this study, the in vitro assembly of tau and anti-amyloidogenic properties of one naturally occurring phytoestrogen, calycosin, was investigated by spectroscopic techniques including ThT and ANS fluorescence, CD, Congo red absorbance as well as TEM analysis. Afterwards the cytotoxicity of different amyloid species against SH-SY5Y cells was evaluated by MTT assay. Fluorescence spectroscopic studies revealed that calycosin exerts its anti-amyloidogenic effects through increasing the lag time and reducing the apparent growth rate constant (kapp), the amount of fibrillation, and the exposure of hydrophobic regions. Congo red absorbance and CD studies indicated that calycosin prevented the formation of tau aggregate species and β-sheets structures, respectively. TEM analysis also determined the capacity of calycosin to inhibit tau fibrillogenesis through formation of large amorphous aggregates. Furthermore, cellular assays disclosed that calycosin mitigated the cell mortality, LDH release, ROS level, and expression of Bax, Bcl-2, and Caspase-3 in both mRNA and protein levels induced by tau amyloid fibrils. In conclusion, this data may suggest that calycosin can prevent tau amyloid fibrillation and the associated cytotoxicity, mainly due to its effects on formation of lower content of oligomeric and fibrillar aggregates with lower solvent-exposed hydrophobic patches compared to those produced in the absence of calycosin.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Zhenxia Z,Min L,Peikui Y,Zikai C,Yaqun L,Junli W,Fenlian Y,Yuzhong Z

doi

10.1016/j.ijbiomac.2020.12.030

subject

Has Abstract

pub_date

2020-12-07 00:00:00

pages

74-81

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(20)35188-6

journal_volume

171

pub_type

杂志文章

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