Cited by 22Alzheimer's disease research and treatmentsDown syndrome and intellectual disability researchNeuroinflammation and Neurodegeneration Mechanisms

Restoring microglial and astroglial homeostasis using DNA immunization in a down Syndrome mouse model.

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Illouz, Tomer, Madar, Ravit, Biragyn, Arya, Okun, Eitan·2019·Brain, Behavior, and Immunity

Abstract

Down Syndrome (DS), the most common cause of genetic intellectual disability, is characterized by over-expression of the APP and DYRK1A genes, located on the triplicated chromosome 21. This chromosomal abnormality leads to a cognitive decline mediated by Amyloid-β (Aβ) overproduction and tau hyper-phosphorylation as early as the age of 40. In this study, we used the Ts65Dn mouse model of DS to evaluate the beneficial effect of a DNA vaccination against the Aβ1-11 fragment, in ameliorating Aβ-related neuropathology and rescue of cognitive and behavioral abilities. Anti-Aβ1-11 vaccination induced antibody production and facilitated clearance of soluble oligomers and small extracellular inclusions of Aβ from the hippocampus and cortex of Ts65Dn mice. This was correlated with reduced neurodegeneration and restoration of the homeostatic phenotype of microglial and astroglial cells. Vaccinated Ts65Dn mice performed better in spatial-learning tasks, exhibited reduced motor hyperactivity typical for this strain, and restored short-term memory abilities. Our findings support the hypothesis that DS individuals may benefit from active immunotherapy against Aβ from a young age by slowing the progression of dementia.

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Crossref · 10.1016/j.bbi.2018.10.004

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  • Human studies suggest increased microglia activation in DS, and Ts65Dn appears to recapitulate this.

    “There have been few studies of microglia in humans and the results are inconsistent but suggest increased activation, a phenotype that Ts65Dn also appears to recapitulate (Illouz et al., 2019).”

    From Neurodevelopment in Down syndrome: Concordance in humans and models (2022) · cites this paper as Illouz et al., 2019

    The Introduction (page unavailable) reports elevated microglial activation markers in human Down syndrome specimens. The Results section on microglial phenotype (page unavailable) finds signs of activation in sham-treated Ts65Dn mice, but similar signs also appear in wild-type mice; it does not establish that Ts65Dn has greater activation than wild type. Thus the proposed recapitulation is only partly supported. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • In Ts65Dn, there is an increase in astrocytes (S100β) in both cortex and hippocampus.

    “Additionally, an increase in astrocytes as identified by S100β staining has been found in both the cortex and the hippocampus (Illouz et al., 2019).”

    From Neurodevelopment in Down syndrome: Concordance in humans and models (2022) · cites this paper as Illouz et al., 2019

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Research works printed but not linked: 1

  1. Ciccarelli R, Di Iorio P, Bruno V, Battaglia G, D’Alimonte I, D’Onofrio M, Nicoletti F, Caciagli F, 1999. Activation of A(1) adenosine or mGlu3 metabotropic glutamate receptors enhances the release of nerve growth factor and S-100beta protein from cultured astrocytes. Glia 27, 275– 281. 10457374

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Authors
Illouz, T., Madar, R., Biragyn, A., & Okun, E.
Affiliations
  • Bar-Ilan University (IL)
  • National Institutes of Health (US)
Corresponding author
Okun, Eitan
Venue
Brain, Behavior, and Immunity
Publisher
Elsevier BV
Published
2019-01
Volume
75
Pages
163-180
ISSN
0889-1591 (ISSN-L)
OpenAlex
W2898109603
Cited by
22
References
146
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 3 · 2020: 4 · 2019: 4
FWCI
1.89
Type
journal article
Language
en
Open access
Locations
  • Brain Behavior and Immunity (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion, other-oa)
  • PubMed Central (acceptedVersion, cc-by)
Funders
  • Alzheimer's Association
  • National Institutes of Health (Z99 AG999999)
  • National Institute on Aging (Z01AG000444)
Topics
  • 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
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Down syndrome, Ts65Dn mouse model, DNA vaccine, amyloid-beta, active immunotherapy, microglial homeostasis, APP, DYRK1A, amyloid-beta oligomers, neurodegeneration, cognitive impairment, spatial learning, short-term memory, motor hyperactivity, Alzheimer's disease
MeSH terms
Dyrk Kinases, Alzheimer Disease, Animals, Astrocytes, Brain, Disease Models, Animal, DNA, Down Syndrome, Hippocampus, Immunization, Male, Mice, Transgenic, Phenotype, Phosphorylation, Protein-Tyrosine Kinases, Amyloid beta-Peptides, Amyloid beta-Protein Precursor, tau Proteins, Protein Serine-Threonine Kinases, Microglia, Mice

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