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Developing Quinacridone-Based Long Fluorescent Lifetime Probes for Cell Membrane Heterogeneity Imaging.
Analytical Chemistry
|October 3, 2025
Summary
New fluorescent probes with long lifetimes resolve cell membrane microdomain heterogeneity. This advance enables precise imaging of membrane polarity and dynamic functional regions during cell migration.
Area of Science:
- Cell Biology
- Biophysics
- Chemical Biology
Background:
- Cell membranes exhibit heterogeneity due to lipid and protein microdomains.
- Fluorescence lifetime imaging (FLIM) offers concentration-independent membrane analysis.
- Existing probes have short lifetimes, limiting microdomain discrimination.
Purpose of the Study:
- To develop novel polarity-sensitive fluorescent probes with extended fluorescence lifetimes.
- To overcome limitations of conventional probes for membrane microdomain imaging.
- To enable precise discrimination of membrane microenvironments and their dynamics.
Main Methods:
- Design and synthesis of polarity-sensitive fluorescent probes.
- Utilizing fluorescence lifetime imaging (FLIM) for microenvironment analysis.
- Cholesterol depletion experiments and cell migration studies in glioma cells.
Main Results:
- Optimized probe CMFL-QASAG shows a large lifetime shift (Δτ ≈ 18 ns) linearly correlated with membrane polarity.
- The probe effectively decouples signals from cellular autofluorescence.
- Dynamic changes in membrane polarity were observed during glioma cell migration.
Conclusions:
- Novel long-lifetime fluorescent probes can resolve membrane heterogeneity.
- CMFL-QASAG enables accurate imaging of membrane polarity and dynamic functional regions.
- This technology facilitates the study of cell membrane dynamics and function.
