INPP5D Modulates TREM2 Loss-of-function Phenotypes in a β-amyloidosis Mouse Model

Overview

Journal iScience

Publisher Cell Press

Date 2023 Apr 10

PMID 37035000

Authors

Akihiro Iguchi

Sho Takatori

Shingo Kimura

Hiroki Muneto

Kai Wang

Hayato Etani

Genta Ito

Haruaki Sato

Yukiko Hori

Junko Sasaki

Takashi Saito

Takaomi C Saido

Tsuneya Ikezu

Toshiyuki Takai

Takehiko Sasaki

Taisuke Tomita

Affiliations

Soon will be listed here.

Abstract

The genetic associations of TREM2 loss-of-function variants with Alzheimer disease (AD) indicate the protective roles of microglia in AD pathogenesis. Functional deficiencies of TREM2 disrupt microglial clustering around amyloid β (Aβ) plaques, impair their transcriptional response to Aβ, and worsen neuritic dystrophy. However, the molecular mechanism underlying these phenotypes remains unclear. In this study, we investigated the pathological role of another AD risk gene, , encoding a phosphoinositide PI(3,4,5)P phosphatase expressed in microglia. In a -deficient TREM2 loss-of-function mouse model, haplodeficiency restored the association of microglia with Aβ plaques, partially restored plaque compaction, and astrogliosis, and reduced phosphorylated tau dystrophic neurites. Mechanistic analyses suggest that TREM2/TYROBP and INPP5D exert opposing effects on PI(3,4,5)P signaling pathways as well as on phosphoproteins involved in the actin assembly. Our results suggest that INPP5D acts downstream of TREM2/TYROBP to regulate the microglial barrier against Aβ toxicity, thereby modulates Aβ-dependent pathological conversion of tau.

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