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Ratiometric fluorescence polarization as a cytometric functional parameter: theory and practice.
Yitzhak Yishai1, Dror Fixler, Meir Cohen-Kashi
1The Biophysical Interdisciplinary Jerome Schottenstein Center for the Research and the Technology of the Cellome, Department of Physics, Bar-Ilan University, Ramat-Gan 52900, Israel. rtcellom@mail.biu.ac.il
Physics in Medicine and Biology
|September 5, 2003
Summary
Ratiometric fluorescence polarization (RFP) offers a sensitive method for monitoring cellular activation. This technique was validated in cellular bioassays, demonstrating its utility in diverse biological applications.
Area of Science:
- Biophysics
- Cell Biology
- Analytical Chemistry
Background:
- Fluorescence polarization (FP) is sensitive to molecular environment changes.
- Wavelength-dependent FP shifts in multi-fluorophore systems offer new analytical possibilities.
- Ratiometric fluorescence polarization (RFP) leverages these shifts for enhanced cellular monitoring.
Purpose of the Study:
- To explore the theoretical basis of wavelength-dependent fluorescence polarization.
- To introduce and validate ratiometric fluorescence polarization (RFP) as a sensitive cytometric parameter.
- To demonstrate RFP's application in diverse cellular bioassays.
Main Methods:
- Theoretical discussion and simulation of fluorescence polarization dependency on emission wavelengths.
- Utilizing real fluorescence spectrum and polarization data for cell simulation.
- Application of RFP as a cytometric measure in three distinct cellular bioassays.
Main Results:
- Theoretical analysis and simulations confirmed the physical basis of RFP.
- RFP demonstrated high sensitivity in simulations and experimental validation.
- RFP successfully monitored apoptosis, receptor interactions, and cellular thiol levels in Jurkat T cells.
Conclusions:
- Ratiometric fluorescence polarization (RFP) is a highly sensitive and versatile cytometric parameter.
- RFP provides a valuable tool for monitoring cellular activation and biological processes.
- RFP shows promise for applications in drug discovery and diagnostics.