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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
Published on: October 24, 2017
Fluorescent probe partitioning in GUVs of binary phospholipid mixtures: implications for interpreting phase behavior
Janos Juhasz1, James H Davis, Frances J Sharom
1Department of Physics, University of Guelph, Guelph, ON, Canada.
Biochimica Et Biophysica Acta
|September 28, 2011
Summary
Choosing the right fluorescent probes is crucial for accurately studying lipid phase separation in giant unilamellar vesicles (GUVs). Different probes can lead to misinterpretations of membrane domain behavior, impacting our understanding of protein organization.
Area of Science:
- Membrane biophysics
- Lipid self-assembly
- Fluorescence microscopy
Background:
- Lipid phase behavior influences integral protein function in cell membranes.
- Giant unilamellar vesicles (GUVs) are model systems for studying lipid organization.
- Accurate visualization of lipid domains requires fluorescent probes with specific partitioning preferences.
Purpose of the Study:
- To investigate the impact of fluorescent probe selection on the interpretation of lipid phase separation in GUVs.
- To characterize phase behavior in binary mixtures of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC).
Main Methods:
- Utilized a panel of fluorescent probes and confocal fluorescence microscopy.
- Examined phase separation in GUVs composed of DOPC/DPPC mixtures.
- Analyzed domain visualization and probe partitioning behavior.
Main Results:
- Patch and fibril gel phase domains co-existed with liquid disordered (l(d)) domains in DOPC/DPPC GUVs across a temperature range of 14-25°C.
- NBD-DPPE was the most effective probe for visualizing fibril domains.
- Rh-DPPE failed to detect fibril domains and influenced the partitioning of other probes.
Conclusions:
- The choice of fluorescent probes significantly affects the interpretation of lipid phase behavior in GUVs.
- Thorough characterization of fluorescent probes is essential for reliable studies of membrane lipid organization.
- Different probes provide distinct insights into the complex phase separation of lipid mixtures.
