1 May 2005 Tracing apoptosis and stimulation in individual cells by fluorescence intensity and anisotropy decay
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J. of Biomedical Optics, 10(3), 034007 (2005). doi:10.1117/1.1924712
Abstract
Presented is the use of fluorescence lifetime (FLT), anisotropy decay, and associated parameters as differential indicators of cellular activity. A specially designed combination of a frequency mode based time resolved microscope and a picoliter well-per-cell array have been used to perform temporal measurements in individual cells under various biological conditions. Two biological models have been examined: mitogenic activation of peripheral blood mononuclear cells (PBMC) and induction of programmed cell death (apoptosis) in Jurkat T cells (JTC). The FLT of fluorescein stained PBMC was found to increase from 4±0.02 to 4.5±0.025 ns due to mitogenic activation, whereas during apoptosis in fluorescein stained JTC, the FLT remained constant. Notably, the rotational correlation times changed in both models: decreased in PBMC from 2.5±0.08 to 2±0.1 ns, and increased in JTC from 2.1±0.07 to 3.3±0.09 ns. FLT and rotational correlation time were used to calculate the steady state fluorescence anisotropy (FA) which was compared to directly measured FA values. The present study suggests that in addition to bioindication, the said parameters can provide valuable information about cellular mechanisms that may involve complex molecular diffusion dynamics, as well as information about structural changes that a cellular fluorophore undergoes in the course of cell activation.
Dror Fixler, Reuven Tirosh, Naomi Zurgil, Mordechai Deutsch, "Tracing apoptosis and stimulation in individual cells by fluorescence intensity and anisotropy decay," Journal of Biomedical Optics 10(3), 034007 (1 May 2005). http://dx.doi.org/10.1117/1.1924712
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KEYWORDS
Cell death

Luminescence

Fluorescence anisotropy

Microscopes

Blood

Modulation

Molecules

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