Formation of tau inclusions in knock-in mice with familial Alzheimer disease (FAD) mutation of presenilin 1 (PS1)

Kentaro Tanemura, Du Hua Chui, Tetsuya Fukuda, Miyuki Murayama, Jung Mi Park, Takumi Akagi, Yoshitaka Tatebayashi, Tomohiro Miyasaka, Tetsuya Kimura, Tsutomu Hashikawa, Yuka Nakano, Takashi Kudo, Masatoshi Takeda, Akihiko Takashima

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

Mutations in the presenilin 1 (PS1) gene are responsible for the early onset of familial Alzheimer disease (FAD). Accumulating evidence shows that PS1 is involved in γ-secretase activity and that FAD-associated mutations of PS1 commonly accelerate Aβ1-42 production, which causes Alzheimer disease (AD). Recent studies suggest, however, that PS1 is involved not only in Aβ production but also in other processes that lead to neurodegeneration. To better understand the causes of neurodegeneration linked to the PS1 mutation, we analyzed the development of tau pathology, another key feature of AD, in PS1 knock-in mice. Hippocampal samples taken from FAD mutant (I213T) PS1 knock-in mice contained hyperphosphorylated tau that reacted with various phosphodependent tau antibodies and with Alz50, which recognizes the conformational change of PHF tau. Some neurons exhibited Congo red birefringence and Thioflavin T reactivity, both of which are histological criteria for neurofibrillary tangles (NFTs). Biochemical analysis of the samples revealed SDS-insoluble tau, which under electron microscopy examination, resembled tau fibrils. These results indicate that our mutant PS1 knock-in mice exhibited NFT-like tau pathology in the absence of Aβ deposition, suggesting that PS1 mutations contribute to the onset of AD not only by enhancing Aβ1-42 production but by also accelerating the formation and accumulation of filamentous tau.

Original languageEnglish
Pages (from-to)5037-5041
Number of pages5
JournalJournal of Biological Chemistry
Volume281
Issue number8
DOIs
Publication statusPublished - 2006 Feb 24
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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