Cited by 184Neuroinflammation and Neurodegeneration MechanismsAlzheimer's disease research and treatmentsDown syndrome and intellectual disability research

Type-I-interferon signaling drives microglial dysfunction and senescence in human iPSC models of Down syndrome and Alzheimer’s disease

Open access
Jin, Mengmeng, Xu, Ranjie, Wang, Le, Alam, Mahabub Maraj, Ma, Ziyuan, Zhu, Sining, Martini, Alessandra C., Jadali, Azadeh +8 more·2022·Cell Stem Cell

Abstract

Microglia are critical in brain development and Alzheimer's disease (AD) etiology. Down syndrome (DS) is the most common genetic developmental disorder and risk factor for AD. Surprisingly, little information is available on the impact of trisomy of human chromosome 21 (Hsa21) on microglial functions during DS brain development and in AD in DS. Using induced pluripotent stem cell (iPSC)-based organoid and chimeric mouse models, we report that DS microglia exhibit an enhanced synaptic pruning function, which alters neuronal synaptic functions. In response to human brain tissue-derived pathological tau, DS microglia undergo cellular senescence and exhibit elevated type-I-interferon signaling. Mechanistically, knockdown of Hsa21-encoded type I interferon receptors, IFNARs, rescues the DS microglial phenotypes both during brain development and in response to pathological tau. Our findings provide in vivo evidence that human microglia respond to pathological tau by exhibiting dystrophic phenotypes. Targeting IFNARs may improve DS microglial functions and prevent senescence.

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Crossref · 10.1016/j.stem.2022.06.007

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  • Increased inflammatory activity in the developing brain may drive microglia to excessively prune synapses and disrupt network refinement.

    “However, genetic knockdown of type I IFN receptors reduces these phenotypes148, suggesting that increased inflammatory activity in the developing brain may drive microglia to excessively prune synapses and disrupt network refinement in the developing brain.”

    From Consequences of trisomy 21 for brain development in Down syndrome (2024) · cites this paper as [148]

    The Results section (‘Inhibiting the expression of IFNARs rescues the defective DS microglia development’; page unavailable) reports that elevated pruning by Down syndrome microglia impaired neurotransmission and synaptic plasticity, and that reducing IFNAR expression partially rescued these defects. This supports the proposed link between increased type I interferon signaling and excessive pruning in the developing-brain model. The paper does not directly assess network refinement or establish the same effect for inflammatory activity generally. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Recent studies demonstrate that type I IFN signaling is essential for cognitive impairment in AD, impacting the neuroinflammatory network and contributing to neuropathogenic processes.

    “recent studies that demonstrate how type I IFN signaling is essential for cognitive impairment in AD,78 not only impacting the neuroinflammatory network of the disease but also contributing to neuropathogenic processes.”

    From Interferon signaling modulates Down syndrome-associated Alzheimer’s disease pathology in a mouse model (2025) · cites this paper as [79]

    The Discussion (page unavailable) links elevated type I IFN signaling to microglial activation, synaptic loss and senescence in AD-related models. The paper's own experiments concern Down syndrome microglia and pathological tau; they do not demonstrate that IFN signaling is essential for cognitive impairment in AD. Its suggestion that targeting IFNARs might slow AD progression is more tentative than the citing sentence. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Microglia derived from T21 iPSCs exhibit increased IFN signalling and over-prune synapses in vitro.

    “Specifically, microglia derived from T21 iPSCs exhibit increased IFN signalling and over-prune synapses in vitro. However, genetic knockdown of type I IFN receptors reduces these phenotypes148, suggesting that increased inflammatory activity in the developing brain may drive microglia to excessively prune synapses and disrupt network refinement in the developing brain.”
  • Genetic knockdown of type I IFN receptors reduces increased IFN signalling and over-pruning in T21 iPSC-derived microglia.

    “However, genetic knockdown of type I IFN receptors reduces these phenotypes148, suggesting that increased inflammatory activity in the developing brain may drive microglia to excessively prune synapses and disrupt network refinement in the developing brain.”

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Cites

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Research works printed but not linked: 1

  1. Warner G, Moss J, Smith P, and Howlin P (2014). Autism characteristics and behavioural disturbances in ~ 500 children with Down’s syndrome in England and Wales. Autism Res 7, 433– 441. 24664986

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Authors
Jin, M., Xu, R., Wang, L., Alam, M. M., Ma, Z., Zhu, S., Martini, A. C., Jadali, A., Bernabucci, M., Xie, P., Kwan, K. Y., Pang, Z. P., Head, E., Liu, Y., Hart, R. P., & Jiang, P.
Affiliations
  • Rutgers, The State University of New Jersey (US)
  • University of California, Irvine (US)
  • Florida International University (US)
Corresponding author
Jiang, Peng
Venue
Cell Stem Cell
Publisher
Elsevier BV
Published
2022-07
Volume
29
Issue
7
Pages
1135-1153.e8
ISSN
  • 1875-9777 (ISSN-L)
  • 1934-5909
OpenAlex
W4284896135
Cited by
174
References
114
Citations by year
2026: 41 · 2025: 49 · 2024: 48 · 2023: 26 · 2022: 10
FWCI
12.55
Type
journal article
Language
en
Open access
Locations
  • Cell stem cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institute on Aging (R01AG073779, P30AG066519)
  • NINDS (R01NS102382, R01NS122108)
  • National Institutes of Health
  • BrightFocus Foundation (BFF17-0008)
  • Florida State University
  • Florida International University
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Down syndrome and intellectual disability research
Keywords
Down syndrome, Alzheimer's disease, microglia, type I interferon signaling, IFNAR, microglial senescence, synaptic pruning, pathological tau, iPSC-derived brain organoids, chimeric mouse model, brain development
MeSH terms
Alzheimer Disease, Animals, Down Syndrome, Humans, Interferons, Amyloid beta-Peptides, Microglia, Mice, Induced Pluripotent Stem Cells

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