Common Mechanisms in Neurodegenerative Diseases

Fantini, Jacques; Yahi, Nouara

doi:10.1016/b978-0-12-800111-0.00008-4

Cited by 1 publication

(1 citation statement)

References 66 publications

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“…Amyloid precursor protein processing is heavily dependent on ganglioside composition of the membrane and lipid rafts are considered platforms for amyloid conversion where processing of APP by secretases occurs (Fabelo et al., 2014; Fantini & Yahi, 2015; Grassi et al., 2019; Grimm et al., 2017; Yamaguchi et al., 2016). However, it is important to discriminate between normal and pathological conditions, primarily Alzheimer's disease (AD).…”

Section: Discussionmentioning

confidence: 99%

Who's in, who's out? Re‐evaluation of lipid raft residents

Mlinac-Jerkovic

Ilić

Zjalić

et al. 2021

Journal of Neurochemistry

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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.

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