TY - JOUR
T1 - Size and Shape of Amyloid Fibrils Induced by Ganglioside Nanoclusters
T2 - Role of Sialyl Oligosaccharide in Fibril Formation
AU - Matsubara, Teruhiko
AU - Nishihara, Masaya
AU - Yasumori, Hanaki
AU - Nakai, Mako
AU - Yanagisawa, Katsuhiko
AU - Sato, Toshinori
N1 - Funding Information:
This study was supported by a Japan Society for the Promotion of Science Kakenhi grant (no. 22300118 to T.M. and K.Y.); the Suzuken Memorial Foundation (no. 11-093 to T.M.); Keio Gijuku Academic Development Funds (T.M.); and the Research Funding for Longevity Sciences from the National Center for Geriatrics and Gerontology, Japan (no. 25-19 to T.M. and K.Y.).
PY - 2017/12/5
Y1 - 2017/12/5
N2 - Ganglioside-enriched microdomains in the presynaptic neuronal membrane play a key role in the initiation of amyloid ß-protein (Aß) assembly related to Alzheimer's disease. We previously isolated lipids from a detergent-resistant membrane microdomain fraction of synaptosomes prepared from aged mouse brain and found that spherical Aß assemblies were formed on Aß-sensitive ganglioside nanoclusters (ASIGN) of reconstituted lipid bilayers in the synaptosomal fraction. In the present study, we investigated the role of oligosaccharides in Aß fibril formation induced by ganglioside-containing mixed lipid membranes that mimic the features of ASIGN. Ganglioside nanoclusters were constructed as ternary mixed lipid bilayers composed of ganglioside (GM1, GM2, GM3, GD1a, or GT1b), sphingomyelin, and cholesterol, and their surface topography was visualized by atomic force microscopy. Aß fibril formation on the nanocluster was strongly induced in the presence of 10 mol % ganglioside, and Aß-sensitive features were observed at cholesterol contents of 35-55 mol %. GM1-, GD1a-, and GT1b-containing membranes induced longer fibrils than those containing GD1b and GM2, indicating that the terminal galactose of GM1 along with N-acetylneuraminic acid accelerates protofibril elongation. These results demonstrate that Aß fibril formation is induced by ASIGN that are highly enriched ganglioside nanoclusters with a limited number of components and that the generation and elongation of Aß protofibrils are regulated by the oligosaccharide structure of gangliosides.
AB - Ganglioside-enriched microdomains in the presynaptic neuronal membrane play a key role in the initiation of amyloid ß-protein (Aß) assembly related to Alzheimer's disease. We previously isolated lipids from a detergent-resistant membrane microdomain fraction of synaptosomes prepared from aged mouse brain and found that spherical Aß assemblies were formed on Aß-sensitive ganglioside nanoclusters (ASIGN) of reconstituted lipid bilayers in the synaptosomal fraction. In the present study, we investigated the role of oligosaccharides in Aß fibril formation induced by ganglioside-containing mixed lipid membranes that mimic the features of ASIGN. Ganglioside nanoclusters were constructed as ternary mixed lipid bilayers composed of ganglioside (GM1, GM2, GM3, GD1a, or GT1b), sphingomyelin, and cholesterol, and their surface topography was visualized by atomic force microscopy. Aß fibril formation on the nanocluster was strongly induced in the presence of 10 mol % ganglioside, and Aß-sensitive features were observed at cholesterol contents of 35-55 mol %. GM1-, GD1a-, and GT1b-containing membranes induced longer fibrils than those containing GD1b and GM2, indicating that the terminal galactose of GM1 along with N-acetylneuraminic acid accelerates protofibril elongation. These results demonstrate that Aß fibril formation is induced by ASIGN that are highly enriched ganglioside nanoclusters with a limited number of components and that the generation and elongation of Aß protofibrils are regulated by the oligosaccharide structure of gangliosides.
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U2 - 10.1021/acs.langmuir.7b02091
DO - 10.1021/acs.langmuir.7b02091
M3 - Article
C2 - 29148800
AN - SCOPUS:85037538251
VL - 33
SP - 13874
EP - 13881
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 48
ER -