Galectin 3–binding protein suppresses amyloid-β production by modulating β-cleavage of amyloid precursor protein
Tsuneyoshi Seki, Motoi Kanagawa, Kazuhiro Kobayashi, Hisatomo Kowa, Naoki Yahata, Kei Maruyama, Nobuhisa Iwata, Haruhisa Inoue, Tatsushi Toda
Abstract
) gene is associated with these changes in Aβ production. GPLD1 overexpression in HEK293 cells increased the secretion of galectin 3-binding protein (GAL3BP), which suppressed Aβ production in an AD model, neuroglioma H4 cells. Mechanistically, GAL3BP suppressed Aβ production by directly interacting with APP and thereby inhibiting APP processing by β-secretase. Furthermore, we show that cells take up extracellularly added GAL3BP via endocytosis and that GAL3BP is localized in close proximity to APP in endosomes where amyloidogenic APP processing takes place. Taken together, our results indicate that GAL3BP may be a suitable target of AD-modifying drugs in future therapeutic strategies for managing AD.