Non-radiative cell membrane associated energy transfer (FRET) from a cyan (ECFP) to a yellow (EYFP) fluorescent protein is used for detection of apoptosis in multi-cellular tumor spheroids. Low light exposure in light sheet fluorescence microscopy is combined with the detection of spectral changes and prolonged fluorescence lifetimes of the donor ECFP upon apoptosis. In view of future label-free detection preliminary experiments of light scattering microscopy with high angular resolution are reported which may give additional information on morphological changes.

© 2015 SPIE

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