Cited by 35Down syndrome and intellectual disability researchAlzheimer's disease research and treatmentsGenetics and Neurodevelopmental Disorders

Astrocytes in Down Syndrome Across the Lifespan

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Ponroy Bally, Blandine, Murai, Keith K.·2021·Frontiers in Cellular Neuroscience

Abstract

Down Syndrome (DS) is the most common genetic cause of intellectual disability in which delays and impairments in brain development and function lead to neurological and cognitive phenotypes. Traditionally, a neurocentric approach, focusing on neurons and their connectivity, has been applied to understanding the mechanisms involved in DS brain pathophysiology with an emphasis on how triplication of chromosome 21 leads to alterations in neuronal survival and homeostasis, synaptogenesis, brain circuit development, and neurodegeneration. However, recent studies have drawn attention to the role of non-neuronal cells, especially astrocytes, in DS. Astrocytes comprise a large proportion of cells in the central nervous system (CNS) and are critical for brain development, homeostasis, and function. As triplication of chromosome 21 occurs in all cells in DS (with the exception of mosaic DS), a deeper understanding of the impact of trisomy 21 on astrocytes in DS pathophysiology is warranted and will likely be necessary for determining how specific brain alterations and neurological phenotypes emerge and progress in DS. Here, we review the current understanding of the role of astrocytes in DS, and discuss how specific perturbations in this cell type can impact the brain across the lifespan from early brain development to adult stages. Finally, we highlight how targeting, modifying, and/or correcting specific molecular pathways and properties of astrocytes in DS may provide an effective therapeutic direction given the important role of astrocytes in regulating brain development and function.

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Crossref · 10.3389/fncel.2021.702685

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  • There is substantial evidence of neuropathology from early in life in DS, including defects in neuronal development, increased ratio of inhibitory to excitatory neurons, alterations in neuronal dendritic spine dynamics, activation of microglia, astrocyte reactivity, and elevated production of inflammatory cytokines in the brain.

    “There is substantial evidence of neuropathology from early in life in DS,6,9,10,21 including defects in neuronal development, an increased ratio of inhibitory to excitatory neurons, alterations in neuronal dendritic spines dynamics, activation of microglia, astrocyte reactivity, and elevated production of inflammatory cytokines in the brain.22,23,24,25”

    From Interferon signaling modulates Down syndrome-associated Alzheimer’s disease pathology in a mouse model (2025) · cites this paper as [25]

    “General Features of the DS Brain” reports reduced neuronal production and abnormal dendritic spines, while “Astrocytes and Alzheimer’s Disease Pathology in DS” reports early astrocyte reactivity, microglial activation, and cytokine production in childhood. The copy does not establish an increased ratio of inhibitory to excitatory neurons; “DS Astrocytes and the Development of Brain Connectivity” discusses altered GABA transmission instead. Page numbers were not available in the indexed passages. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Astrocytes play a critical role in the pathophysiology of both DS and AD.

    “Accumulating evidence has underscored the critical role of astrocytes in the pathophysiology of both DS (56) and AD (57).”

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Authors
Ponroy Bally, B., & Murai, K. K.
Affiliations
Montreal General Hospital (CA)
Corresponding author
Murai, Keith K.
Venue
Frontiers in Cellular Neuroscience
Published
2021-08-18
Volume
15
Pages
702685-702685
ISSN
1662-5102 (ISSN-L)
OpenAlex
W3195922641
Cited by
35
References
168
Citations by year
2026: 3 · 2025: 12 · 2024: 4 · 2023: 9 · 2022: 7
FWCI
0.89
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Cellular Neuroscience (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • McGill University
  • Faculty of Medicine, McGill University
  • International Development Research Centre
  • Azrieli Foundation
  • Canada First Research Excellence Fund
  • Canadian Institutes of Health Research (PJT148569, 156247)
  • Natural Sciences and Engineering Research Council of Canada (PJT148569, 69404, 408044-2011)
Topics
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Down syndrome and intellectual disability research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
Down syndrome, astrocytes, intellectual disability, brain development, astrocyte dysfunction, lifespan, therapeutic target, non-neuronal cells, neurodevelopmental disorders

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