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Amyloid-β aggregates induced by β-cholesteryl glucose-embedded liposomes.

Authors:
Toshinori Shimanouchi Yasuhiro Sano Kazuma Yasuhara Yukitaka Kimura

Biochim Biophys Acta Proteins Proteom 2022 Aug 29;1870(8):140816. Epub 2022 Jun 29.

Graduate School of Environmental and Life Science, Okayama University, 3-1-1 Tsushimanaka, kita-kku, Okayama 700-8530, Japan.

Senile plaques that is characterized as an amyloid deposition found in Alzheimer's disease are composed primarily of fibrils of an aggregated peptide, amyloid β (Aβ). The ability to monitor senile plaque formation on a neuronal membrane under physiological conditions provides an attractive model. In this study, the growth behavior of amyloid Aβ fibrils in the presence of liposomes incorporating β-cholesteryl-D-glucose (β-CG) was examined using total internal reflection fluorescence microscopy, transmittance electron microscopy, and other spectroscopic methods. We found that β-CG on the liposome membrane induced the spontaneous formation of spherulitic Aβ fibrillar aggregates. The β-CG cluster formed on liposome membranes appeared to induce the accumulation of Aβ, followed by the growth of the spherulitic Aβ aggregates. In contrast, DMPC and DMPC incorporated cholesterol-induced fibrils that are laterally associated with each other. A comparison study using three types of liposomes implied that the induction of glucose contributed to the agglomeration of Aβ fibrils and liposomes. This agglomeration required the spontaneous formation of spherulitic Aβ fibrillary aggregates. This action can be regarded as a counterbalance to the growth of fibrils and their toxicity, which has great potential in the study of amyloidopathies.

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Source
http://dx.doi.org/10.1016/j.bbapap.2022.140816DOI Listing
August 2022

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