Advancements in a FRET Biosensor for Live-Cell Fluorescence-Lifetime High-Throughput Screening of Alpha-Synuclein.

Advancements in a FRET Biosensor for Live-Cell Fluorescence-Lifetime High-Throughput Screening of Alpha-Synuclein.
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α-突触核蛋白的活细胞荧光高通量筛选的FRET生物传感器中的进步。

DOI:
10.1177/17590914231184086
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发表时间:
2023-01
期刊:
影响因子:
4.7
通讯作者:
Sachs, Jonathan N.
Sachs, Jonathan N.
中科院分区:
医学3区
文献类型:
--
作者:
Braun, Anthony R.;Kochen, Noah Nathan;Yuen, Samantha L.;Liao, Elly E.;Cornea, Razvan L.;Thomas, David D.;Sachs, Jonathan N.

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迫切需要能够挽救α-突触核蛋白(ASyn)错误折叠和寡聚化引起的病理生理表型的小分子。在我们以前的aSyn细胞荧光寿命(Flt)-Förster共振能量转移(FRET)生物传感器的基础上,我们开发了一种包含红移mCyRFP1/mMaroon1(OFP/MFP)FRET对的可诱导细胞模型。与我们以前的GFP/RFP aSyn生物传感器相比,这种新的aSyn FRET生物传感器提高了信噪比,减少了非特异性背景FRET,并导致FRET信号增加了4倍(瞬时转染)和2倍(稳定、可诱导的细胞系)。可诱导系统具有更大的时间控制性和可扩展性,允许微调生物传感器的表达,并将因过表达aSyn而产生的细胞毒性降至最低。使用这些可诱导的aSyn-OFP/MFP生物传感器,我们筛选了2684个商业上可用的FDA批准的化合物的Selleck文库,并确定原花青素和卡萨兰醇为新的热门化合物。二次检测证实了这些化合物调节aSyn Fflt-FRET的能力。细胞毒性和aSyn纤化的功能检测表明,它们具有抑制种子aSyn纤化的能力。原花青素完全挽救了aSyn纤维诱导的细胞毒性,EC_(50)为200 NM,而桂皮酚的EC50为85.5%,预计EC50为34.2 μM。此外,在未来的工业规模(百万化合物)化学库的高通量筛选活动中,原花青素为验证我们的aSyn生物传感器性能提供了有价值的工具化合物。
There is a critical need for small molecules capable of rescuing pathophysiological phenotypes induced by alpha-synuclein (aSyn) misfolding and oligomerization. Building upon our previous aSyn cellular fluorescence lifetime (FLT)-Förster resonance energy transfer (FRET) biosensors, we have developed an inducible cell model incorporating the red-shifted mCyRFP1/mMaroon1 (OFP/MFP) FRET pair. This new aSyn FRET biosensor improves the signal-to-noise ratio, reduces nonspecific background FRET, and results in a 4-fold increase (transient transfection) and 2-fold increase (stable, inducible cell lines) in FRET signal relative to our previous GFP/RFP aSyn biosensors. The inducible system institutes greater temporal control and scalability, allowing for fine-tuning of biosensor expression and minimizes cellular cytotoxicity due to overexpression of aSyn. Using these inducible aSyn-OFP/MFP biosensors, we screened the Selleck library of 2684 commercially available, FDA-approved compounds and identified proanthocyanidins and casanthranol as novel hits. Secondary assays validated the ability of these compounds to modulate aSyn FLT-FRET. Functional assays probing cellular cytotoxicity and aSyn fibrillization demonstrated their capability to inhibit seeded aSyn fibrillization. Proanthocyanidins completely rescued aSyn fibril-induced cellular toxicity with EC50 of 200 nM and casanthranol supported a 85.5% rescue with a projected EC50 of 34.2 μM. Furthermore, proanthocyanidins provide a valuable tool compound to validate our aSyn biosensor performance in future high-throughput screening campaigns of industrial-scale (million-compound) chemical libraries.
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