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- W2891948325 abstract "Membrane viscosity and hydration levels characterize the biophysical properties of biological membranes and are reflected in the rate and extent of solvent relaxation, respectively, of environmentally sensitive fluorophores such as Laurdan. Here, we first developed a method for a time-resolved general polarization (GP) analysis with fluorescence-lifetime imaging microscopy that captures both the extent and rate of Laurdan solvent relaxation. We then conducted time-resolved GP measurements with Laurdan-stained model membranes and cell membranes. These measurements revealed that cholesterol levels in lipid vesicles altered membrane hydration and viscosity, whereas curvature had little effect on either parameter. We also applied the method to the plasma membrane of live cells using a supercritical angle fluorescence objective, to our knowledge the first time fluorescence-lifetime imaging microscopy images were generated with supercritical angle fluorescence. Here, we found that local variations in membrane cholesterol most likely account for the heterogeneity of Laurdan lifetime in plasma membrane. In conclusion, time-resolved GP measurements provide additional insights into the biophysical properties of membranes." @default.
- W2891948325 created "2018-09-27" @default.
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- W2891948325 date "2018-10-01" @default.
- W2891948325 modified "2023-10-16" @default.
- W2891948325 title "Time-Resolved Laurdan Fluorescence Reveals Insights into Membrane Viscosity and Hydration Levels" @default.
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- W2891948325 doi "https://doi.org/10.1016/j.bpj.2018.08.041" @default.
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