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Isolation of Lipid Rafts (Detergent-Resistant Microdomains) and Comparison to Extracellular Vesicles (Exosomes)
1Biological Sciences Division, Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL, USA. dawg@uchicago.edu.
Methods in Molecular Biology (Clifton, N.J.)
|August 10, 2020
Summary
Lipid rafts (LRs) are crucial cell membrane microdomains. This review outlines a method for isolating these cholesterol- and sphingolipid-rich structures for further analysis.
Area of Science:
- Cell Biology
- Biochemistry
- Molecular Biology
Background:
- Lipid rafts (LRs) are specialized membrane microdomains enriched in sphingolipids and cholesterol.
- LRs can organize and regulate signaling molecules within the cell.
- Several models exist regarding LR structure and detergent interaction.
Purpose of the Study:
- To review different models of lipid raft structure and composition.
- To present a standardized method for isolating lipid rafts.
- To enable lipidomic, proteomic, and cellular signaling analysis of isolated LRs.
Main Methods:
- Definition of LRs as small (50 nm) particles insoluble in 1% Triton X-100 at 4°C with low buoyant density.
- Presentation of a generic isolation protocol for LRs.
- Utilizing biochemical and biophysical techniques for characterization.
Main Results:
- Discussion of three models explaining LR heterogeneity and detergent interactions.
- Identification of key biomarkers associated with insoluble LRs.
- Establishment of a reproducible method for LR isolation.
Conclusions:
- Lipid rafts are dynamic structures with varying proposed models.
- A defined operational definition of LRs is crucial for consistent research.
- The presented method facilitates comprehensive analysis of LRs for various biological studies.
