Cited by 37Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsInflammasome and immune disorders

INPP5D modulates TREM2 loss-of-function phenotypes in a β-amyloidosis mouse model

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Iguchi, Akihiro, Takatori, Sho, Kimura, Shingo, Muneto, Hiroki, Wang, Kai, Etani, Hayato, Ito, Genta, Sato, Haruaki +8 more·2023·iScience

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, INPP5D , encoding a phosphoinositide PI(3,4,5)P 3 phosphatase expressed in microglia. In a Tyrobp -deficient TREM2 loss-of-function mouse model, Inpp5d 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 3 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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Crossref · 10.1016/j.isci.2023.106375

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Authors
Iguchi, A., Takatori, S., Kimura, S., Muneto, H., Wang, K., Etani, H., Ito, G., Sato, H., Hori, Y., Sasaki, J., Saito, T., Saido, T. C., Ikezu, T., Takai, T., Sasaki, T., & Tomita, T.
Affiliations
  • The University of Tokyo (JP)
  • Teikyo University (JP)
  • Tokyo Medical and Dental University (JP)
  • RIKEN Center for Brain Science (JP)
  • Mayo Clinic in Florida (US)
  • Tohoku University (JP)
Corresponding author
Tomita, Taisuke
Venue
iScience
Publisher
Elsevier BV
Published
2023-04
Volume
26
Issue
4
Pages
106375
ISSN
2589-0042 (ISSN-L)
OpenAlex
W4324100576
Cited by
37
References
99
Citations by year
2026: 10 · 2025: 9 · 2024: 11 · 2023: 7
FWCI
5.33
Type
journal article
Language
en
Open access
Locations
  • iScience (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Institutional Repositories DataBase (IRDB) (submittedVersion, cc-by-nc-nd)
Funders
  • Mitsubishi Foundation
  • Biogen
  • University of Tokyo
  • Uehara Memorial Foundation
  • Juntendo University
  • Japan Agency for Medical Research and Development (JP20dm0107056, JP20dm0207073)
  • Nagoya City University
  • Japan Society for the Promotion of Science (15H02492, 19H01015, 19K07080)
  • Japan Science and Technology Agency (JPMJMS2024)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Inflammasome and immune disorders
Keywords
INPP5D, TREM2, TYROBP, beta-amyloidosis, microglia, tau pathology, actin cytoskeleton, phosphoproteins, neuroinflammation, Alzheimer's disease

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