Cited by 7Down syndrome and intellectual disability researchNeurogenesis and neuroplasticity mechanismsAlzheimer's disease research and treatments

Postnatal Cytoarchitecture and neurochemical hippocampal dysfunction in Down Syndrome

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Moreno, David G., Utagawa, Emma C., Arva, Nicoleta C., Schafernak, Kristian T., Mufson, Elliott J., Perez, Sylvia E.·2021·Journal of Clinical Medicine

Abstract

Although the prenatal hippocampus displays deficits in cellular proliferation/migration and volume, which are later associated with memory deficits, little is known about the effects of trisomy 21 on postnatal hippocampal cellular development in Down syndrome (DS). We examined postnatal hippocampal neuronal profiles from autopsies of DS and neurotypical (NTD) neonates born at 38-weeks’-gestation up to children 3 years of age using antibodies against non-phosphorylated (SMI-32) and phosphorylated (SMI-34) neurofilament, calbindin D-28k (Calb), calretinin (Calr), parvalbumin (Parv), doublecortin (DCX) and Ki-67, as well as amyloid precursor protein (APP), amyloid beta (Aβ) and phosphorylated tau (p-tau). Although the distribution of SMI-32-immunoreactive (-ir) hippocampal neurons was similar at all ages in both groups, pyramidal cell apical and basal dendrites were intensely stained in NTD cases. A greater reduction in the number of DCX-ir cells was observed in the hippocampal granule cell layer in DS. Although the distribution of Calb-ir neurons was similar between the youngest and oldest NTD and DS cases, Parv-ir was not detected. Conversely, Calr-ir cells and fibers were observed at all ages in DS, while NTD cases displayed mainly Calr-ir fibers. Hippocampal APP/Aβ-ir diffuse-like plaques were seen in DS and NTD. By contrast, no Aβ1–42 or p-tau profiles were observed. These findings suggest that deficits in hippocampal neurogenesis and pyramidal cell maturation and increased Calr immunoreactivity during early postnatal life contribute to cognitive impairment in DS.

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  • Reduced neurogenesis occurs in both humans with DS-AD and DS mouse models.

    “We expected to find specific alterations in the DG due to reduced neurogenesis in both humans with DS‐AD and DS mouse models. 38 , 39”

    From Disruption of hippocampal upstream regulators of mTOR and insulin pathways in Down syndrome with Alzheimer's disease neuropathology: Preliminary observations (2026) · cites this paper as [39]

    The Introduction reports impaired neurogenesis in human DS fetuses and restoration of neurogenesis after treatment in a Ts65Dn DS mouse model. The Discussion (§4.1) also suggests a postnatal neurogenesis/migration deficit in children with DS. These passages concern developmental DS, not humans with DS-associated Alzheimer’s disease (DS-AD), so the human population specified in the claim is not supported. (LLM, conf=0.87)

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3 of the 78 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. [16]Insausti R. Amaral D.G. Hippocampal formation Human Nervous System 2nd ed. Paxinos G. Mai J.K. Academic Press Cambridge, MA, USA 2003 871 914
  2. [76]Coppelletta J.M. Wolbach S.B. Body length and organ weights of infants and children Am. J. Pathol. 1933 9 55 19970058 PMC2062747

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Authors
Moreno, D. G., Utagawa, E. C., Arva, N. C., Schafernak, K. T., Mufson, E. J., & Perez, S. E.
Affiliations
  • Barrow Neurological Institute (US)
  • Lurie Children's Hospital (US)
  • Phoenix Children's Hospital (US)
Corresponding author
Perez, Sylvia E.
Venue
Journal of Clinical Medicine
Publisher
MDPI AG
Published
2021-07-31
Volume
10
Issue
15
Pages
3414
ISSN
2077-0383 (ISSN-L)
OpenAlex
W3189811284
Cited by
7
References
78
Citations by year
2026: 1 · 2025: 1 · 2024: 2 · 2022: 2 · 2021: 1
FWCI
1.08
Type
journal article
Language
en
Open access
Locations
  • Journal of Clinical Medicine (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institute on Aging (P01AG014449, R01AG061566)
  • BrightFocus Foundation (CA2018010)
  • Arizona Alzheimer’s Consortium (P30AG010161)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Down syndrome and intellectual disability research
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
Keywords
Down syndrome, hippocampus, postnatal development, hippocampal neurogenesis, doublecortin, calretinin, parvalbumin, calbindin-D28k, amyloid plaques, amyloid-beta, phosphorylated tau, neuronal cytoarchitecture, cognitive impairment, neonates

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