Takayuki Ohnishi, Masako Yanazawa, Tomoya Sasahara, Yasuki Kitamura, Hidekazu Hiroaki, Yugo Fukazawa, Isao Kii, Takashi Nishiyama, Akiyoshi Kakita, Hiroyuki Takeda, Akihide Takeuchi, Yoshie Arai, Akane Ito, Hitomi Komura, Hajime Hirao, Kaori Satomura, Masafumi Inoue, Shin-ichi Muramatsu, Ko Matsui, Mari Tada, Michio Sato, Eri Saijo, Yoshiki Shigemitsu, Satoko Sakai, Yoshitaka Umetsu, Natsuko Goda, Naomi Takino, Hitoshi Takahashi, Masatoshi Hagiwara, Tatsuya Sawasaki, Genji Iwasaki, Yu Nakamura, Yo-ichi Nabeshima, David B Teplow, Minako Hoshi
Neurodegeneration correlates with Alzheimer's disease (AD) symptoms, but the molecular identities of pathogenic amyloid β-protein (Aβ) oligomers and their targets, leading to neurodegeneration, remain unclear. Amylospheroids (ASPD) are AD patient-derived 10- to 15-nm spherical Aβ oligomers that cause selective degeneration of mature neurons. Here, we show that the ASPD target is neuron-specific Na(+)/K(+)-ATPase α3 subunit (NAKα3). ASPD-binding to NAKα3 impaired NAKα3-specific activity, activated N-type voltage-gated calcium channels, and caused mitochondrial calcium dyshomeostasis, tau abnormalities, and neurodegeneration...
August 11, 2015: Proceedings of the National Academy of Sciences of the United States of America