Cited by 127Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsNeurological Disease Mechanisms and Treatments

Deficiency of TYROBP, an adapter protein for TREM2 and CR3 receptors, is neuroprotective in a mouse model of early Alzheimer’s pathology

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Haure-Mirande, Jean-Vianney, Audrain, Mickael, Fanutza, Tomas, Kim, Soong Ho, Klein, William L., Glabe, Charles, Readhead, Ben, Dudley, Joel T. +6 more·2017·Acta Neuropathologica

Abstract

Conventional genetic approaches and computational strategies have converged on immune-inflammatory pathways as key events in the pathogenesis of late onset sporadic Alzheimer’s disease (LOAD). Mutations and/or differential expression of microglial specific receptors such as TREM2, CD33, and CR3 have been associated with strong increased risk for developing Alzheimer’s disease (AD). DAP12 (DNAX-activating protein 12)/TYROBP, a molecule localized to microglia, is a direct partner/adapter for TREM2, CD33, and CR3. We and others have previously shown that TYROBP expression is increased in AD patients and in mouse models. Moreover, missense mutations in the coding region of TYROBP have recently been identified in some AD patients. These lines of evidence, along with computational analysis of LOAD brain gene expression, point to DAP12/TYROBP as a potential hub or driver protein in the pathogenesis of AD. Using a comprehensive panel of biochemical, physiological, behavioral, and transcriptomic assays, we evaluated in a mouse model the role of TYROBP in early stage AD. We crossed an Alzheimer’s model mutant APP KM670/671NL /PSEN1 Δexon9 (APP/PSEN1) mouse model with Tyrobp −/− mice to generate AD model mice deficient or null for TYROBP (APP/PSEN1; Tyrobp +/− or APP/PSEN1; Tyrobp −/−). While we observed relatively minor effects of TYROBP deficiency on steady-state levels of amyloid-β peptides, there was an effect of Tyrobp deficiency on the morphology of amyloid deposits resembling that reported by others for Trem2 −/− mice. We identified modulatory effects of TYROBP deficiency on the level of phosphorylation of TAU that was accompanied by a reduction in the severity of neuritic dystrophy. TYROBP deficiency also altered the expression of several AD related genes, including Cd33. Electrophysiological abnormalities and learning behavior deficits associated with APP/PSEN1 transgenes were greatly attenuated on a Tyrobp-null background. Some modulatory effects of TYROBP on Alzheimer’s-related genes were only apparent on a background of mice with cerebral amyloidosis due to overexpression of mutant APP/PSEN1. These results suggest that reduction of TYROBP gene expression and/or protein levels could represent an immune-inflammatory therapeutic opportunity for modulating early stage LOAD, potentially leading to slowing or arresting the progression to full-blown clinical and pathological LOAD.

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  • Numerous studies targeting members of the TREM2/TYROBP pathway (Trem2, Tyrobp, and miR155) support beneficial outcomes associated with maintenance and/or restoration of homeostatic functions of microglia.

    “Support for beneficial outcomes associated with maintenance and/or restoration of homeostatic functions of microglia comes from the numerous studies targeting the members of this pathway, including Trem2,48,50–52 Tyrobp,53,54 and miR155.41,55”

    From Microglial <i>INPP5D</i> limits plaque formation and glial reactivity in the PSAPP mouse model of Alzheimer's disease (2023) · cites this paper as [53]

    The Discussion (page unavailable) reports that TYROBP deficiency in an early Alzheimer’s mouse model improved learning behavior and normalized some synaptic dysfunction, supporting a beneficial outcome from targeting Tyrobp. It does not establish that the benefit resulted from maintaining or restoring homeostatic microglial functions. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • Manipulation of molecules involved in immune/microglial function in either direction may result in detrimental or exacerbated pathological outcomes.

    “However, as we have previously seen in our studies modulating Tyrobp expression, manipulation of molecules involved in immune/microglial function in either direction may result in detrimental or exacerbated pathological outcomes.49,53,54,56”

    From Microglial <i>INPP5D</i> limits plaque formation and glial reactivity in the PSAPP mouse model of Alzheimer's disease (2023) · cites this paper as [53]

    The Discussion (page unavailable) says reduced TREM2 may be beneficial early but detrimental later, supporting the possibility that an immune-related manipulation can have harmful effects under some conditions. However, this paper found TYROBP deficiency protective in its early Alzheimer’s mouse model and says TYROBP overexpression was beyond its scope. It therefore does not establish detrimental outcomes from manipulating TYROBP in either direction. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • A reduction of Tyrobp has neuroprotective effects on AD pathology.

    “Previous studies have shown that a reduction of Tyrobp has neuroprotective effects on AD pathology38,39.”

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Authors
Haure-Mirande, J.-V., Audrain, M., Fanutza, T., Kim, S. H., Klein, W. L., Glabe, C., Readhead, B., Dudley, J. T., Blitzer, R. D., Wang, M., Zhang, B., Schadt, E. E., Gandy, S., & Ehrlich, M. E.
Affiliations
  • Icahn School of Medicine at Mount Sinai (US)
  • Northwestern University (US)
  • University of California, Irvine (US)
Corresponding author
  • Gandy, Sam
  • Ehrlich, Michelle E.
Venue
Acta Neuropathologica
Published
2017-06-13
Volume
134
Issue
5
Pages
769-788
ISSN
  • 0001-6322 (ISSN-L)
  • 1432-0533
OpenAlex
W2625865615
Cited by
127
References
88
Citations by year
2026: 7 · 2025: 10 · 2024: 22 · 2023: 11 · 2022: 12 · 2021: 15 · 2020: 22 · 2019: 11 · 2018: 14 · 2017: 3
FWCI
6.81
Type
journal article
Language
en
Open access
Locations
  • Acta Neuropathologica (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • National Institute on Aging (AG046170)
  • Louis B. Mayer foundation
  • Cure Alzheimer's Fund
  • BrightFocus Foundation (A2016482F)
  • Sarah and Gideon Gartner Foundation
  • Georgianne and Dr Reza Khatib Foundation
  • Werber Family Foundation
  • Jennifer and Scott Moskowitz Foundation
  • Jane Martin and Stuart Katz Foundation
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neurological Disease Mechanisms and Treatments
Keywords
TYROBP, DAP12, TREM2, CD33, CR3, Alzheimer's disease, microglia, neuroinflammation, amyloid-beta, tau phosphorylation, neuritic dystrophy, learning deficits, neuroprotection, gene knockout, early Alzheimer's disease, cerebral amyloidosis
MeSH terms
Alzheimer Disease, Animals, Brain, Disease Models, Animal, Mutation, Phosphorylation, tau Proteins, Microglia, Mice, Knockout, Maze Learning, Adaptor Proteins, Signal Transducing, Mice

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