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Updated: Nov 6, 2025
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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
Published on: August 3, 2021
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Ceramide-mediation of diffusion in supported lipid bilayers
Masroor Hossain1, G J Blanchard1
1Michigan State University, Department of Chemistry, 578 S. Shaw Lane, East Lansing, MI, 48824, USA.
Chemistry and Physics of Lipids
|May 10, 2021
Summary
Ceramide influences the dynamics of the plasma membrane
Area of Science:
- Biophysics
- Membrane Biology
- Materials Science
Background:
- Mammalian plasma membrane fluidity and heterogeneity are crucial for its functions.
- Model bilayer systems offer controlled environments to study membrane properties.
- Ceramide, a phospholipid, forms extensive hydrogen bonds in the headgroup region.
Purpose of the Study:
- To investigate the role of ceramide in planar model bilayers.
- To understand how ceramide affects lipid diffusion dynamics within the membrane.
- To characterize the diffusional behavior in different regions of the model bilayer.
Main Methods:
- Utilized fluorescence recovery after photobleaching (FRAP) to measure translational diffusion.
- Employed two distinct chromophores to probe acyl chain and headgroup regions.
- Constructed supported model bilayers with controlled lipid compositions (cholesterol, DOPC, sphingomyelin, ceramide).
Main Results:
- Diffusion constants were obtained for both acyl chain and headgroup regions.
- Headgroup region dynamics exhibited anomalous diffusion.
- Anomalous diffusion indicates a spatially heterogeneous membrane environment.
Conclusions:
- Ceramide incorporation impacts lipid dynamics within model bilayers.
- The headgroup region of ceramide-containing bilayers is spatially heterogeneous.
- These findings contribute to understanding membrane heterogeneity and ceramide's role.
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