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Who's in, who's out? Re-evaluation of lipid raft residents
- Source :
- J Neurochem
- Publication Year :
- 2021
-
Abstract
- Lipid rafts, membrane microdomains enriched with (glyco)sphingolipids, cholesterol, and select proteins, act as cellular signalosomes. Various methods have been used to separate lipid rafts from bulk (non-raft) membranes, but most often non-ionic detergent Triton X-100 has been used in their isolation. However, Triton X-100 is a reported disruptor of lipid rafts. Histological evidence confirmed raft disruption by Triton X-100 but remarkably revealed raft stability to treatment with a related polyethylene oxide detergent, Brij O20. We report isolation of detergent-resistant membranes from mouse brain using Brij O20 and its use to determine the distribution of major mammalian brain gangliosides, GM1, GD1a, GD1b and GT1b. A different distribution of gangliosides – classically used as a raft marker - was discovered using Brij O20 versus Triton X-100. Immunohistochemistry and imaging mass spectrometry confirm the results. Use of Brij O20 results in a distinctive membrane distribution of gangliosides that is not all lipid raft associated but depends on the ganglioside structure. This is the first report of a significant proportion of gangliosides outside raft domains. We also determined the distribution of proteins functionally related to neuroplasticity and known to be affected by ganglioside environment, glutamate receptor subunit 2, amyloid precursor protein and neuroplastin and report the lipid raft populations of these proteins in mouse brain tissue. This work will enable more accurate lipid raft analysis with respect to glycosphingolipid and membrane protein composition and lead to improved resolution of lipid-protein interactions within biological membranes.
- Subjects :
- Male
0301 basic medicine
detergent-resistant membranes
glycosphingolipids
glutamate receptor subunit 2
amyloid precursor protein
neuroplastin
Biochemistry
Article
Mice
03 medical and health sciences
Cellular and Molecular Neuroscience
chemistry.chemical_compound
Membrane Microdomains
0302 clinical medicine
Gangliosides
Animals
Lipid raft
Sphingolipids
Membrane Glycoproteins
Ganglioside
Biological membrane
Glycosphingolipid
Raft
Sphingolipid
Mice, Inbred C57BL
Cholesterol
030104 developmental biology
chemistry
Membrane protein
Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
Biophysics
Female
lipids (amino acids, peptides, and proteins)
Neuroplastin
030217 neurology & neurosurgery
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- J Neurochem
- Accession number :
- edsair.doi.dedup.....3e6fffeb2c64d6c344854e4a97e69770