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- W2023494393 abstract "Confocal fluorescence imaging and fluorescence resonance energy transfer (FRET) technology have been widely used to study protein–protein interactions in living cells. However, it is very difficult to quantitatively analyze FRET efficiency due to the excitation spectral crosstalk and emission spectral crosstalk between donor and acceptor. In this study, we developed a novel method to quantitatively obtain the FRET efficiency by fitting the emission spectra (FES) of donor–acceptor pair, and this method is free from both excitation and emission spectral crosstalk. We used the FES method to quantitatively monitor the FRET efficiency of SCAT3, a caspase-3 indicator based on FRET, inside living cells stably expressing SCAT3 during STS-induced apoptosis. At 0, 6 and 12 h after STS treatment, the FRET efficiency of SCAT3 obtained by FES are consistent with that by two-photon excitation (TPE) fluorescence lifetime imaging microscopy (FLIM) in living cells stably expressing SCAT3. In this study, the FES was also used to analyze the caspase-3 activation in living cells during anti-cancer drug such as taxol, Artesunate (ART) or Dihydroartemisinin (DHA) treatment. Our results showed that ART or DHA induced apoptosis by a caspase-3-dependent manner, while caspase-3 was not involved in taxol-induced cell death." @default.
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- W2023494393 date "2009-12-01" @default.
- W2023494393 modified "2023-09-26" @default.
- W2023494393 title "Quantitative analysis of caspase-3 activation by fitting fluorescence emission spectra in living cells" @default.
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- W2023494393 doi "https://doi.org/10.1016/j.micron.2009.07.001" @default.
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