Glial-neurotrophic mechanisms in Down syndrome

Topic: Brain proteins, microglia and lab models

Complex interactions and interconnectivity between neurons are hallmarks of normal neuronal differentiation and development. Neurons also interact with other cell types, notably glia, and rely on substances released by glia for their normal function. A deficit in glial response may disturb this critical neuronal-glial-neuronal interaction in Down syndrome (DS), leading to loss of neurons and other defects of development, and contribute to cognitive limitation and early onset of Alzheimer disease. The hypothesis this paper will discuss is that normal neural development involves an activity-dependent release of substances from neurons, and that these substances act upon glia cells which in turn release substances that influence neurons to promote their survival and development. This glial influence affects cortical neurons and also the subcortical cholinergic neurons that project to the cerebral and hippocampal cortices to maintain cortical neuronal excitability and activity. The neuronal activity stimulates glial secretion of sustaining substances, in a reciprocally interactive cycle. Some aspect of this "virtuous cycle" is deficient in Down syndrome. The result is a small but slowly increasing deficit in activity-dependent support by glia cells which produces a gradually increasing abnormality of cortical and subcortical, perhaps especially cholinergic, function.

Key findings

• The result is a small but slowly increasing deficit in activity-dependent support by glia cells which produces a gradually increasing abnormality of cortical and subcortical, perhaps especially cholinergic, function.

Why it matters

This paper proposes a hypothesis that deficient glial support in Down syndrome contributes to cognitive limitation and early Alzheimer's disease. It is a theoretical discussion without experimental treatment or prevention data.

Study details

• Evidence strengthLow

Read the original

• DOI: 10.1007/978-3-7091-6262-0_7
• PubMed: 11771763
• Original source →

May need a subscription OpenAlex found no free copy of the full text (checked 6 Feb 1020), so the publisher may charge for it. The PubMed abstract is free.

@article{nelson2001-11771763,
  author  = {Nelson, P. G. and McCune, S. K. and Ades, A. M. and Nelson, K. B.},
  title   = {{Glial-neurotrophic mechanisms in Down syndrome}},
  journal = {Journal of neural transmission. Supplementum},
  year    = {2001},
  doi     = {10.1007/978-3-7091-6262-0_7},
  pmid    = {11771763},
  url     = {https://doi.org/10.1007/978-3-7091-6262-0_7}
}

Studies this one cites

Referenced by this study and also in the alzhub library, so you can read them here.

• Developmental abnormalities and age-related neurodegeneration in a mouse model of Down syndrome Proceedings of the National Academy of Sciences of the United States of America · 1996-11-01 · usefulness score 49/100 · Down syndrome and Alzheimer's
• Molecular abnormalities of the brain in Down syndrome: relevance to Alzheimer's neurodegeneration Journal of neural transmission. Supplementum · 1999-01-01 · usefulness score 43/100 · Down syndrome and Alzheimer's
• Cerebral cortical astroglia from the trisomy 16 mouse, a model for down syndrome, produce neuronal cholinergic deficits in cell culture Proceedings of the National Academy of Sciences of the United States of America · 1997-11-01 · usefulness score 38/100 · Down syndrome and Alzheimer's
• Neuropeptide Y immunoreactive neurons in murine trisomy 16 cortical cultures. Plasticity of expression and differentiation Molecular and chemical neuropathology · 1994-08-01 · usefulness score 30/100 · Down syndrome and Alzheimer's

Related studies in Down syndrome and Alzheimer's

• Total numbers of neurons and glial cells in cortex and basal ganglia of aged brains with Down syndrome--a stereological study Cerebral cortex (New York, N.Y. : 1991) · 2011-03-22 · usefulness score 41/100
• Decreased brain-derived neurotrophic factor depends on amyloid aggregation state in transgenic mouse models of Alzheimer's disease The Journal of neuroscience : the official journal of the Society for Neuroscience · 2009-07-01 · usefulness score 36/100
• Enhancement of neurogenesis and memory by a neurotrophic peptide in mild to moderate traumatic brain injury Neurosurgery · 2015-02-01 · usefulness score 35/100
• Uric acid and allantoin levels in Down syndrome: antioxidant and oxidative stress mechanisms? Clinica chimica acta; international journal of clinical chemistry · 2004-03-01 · usefulness score 41/100
• Common pathogenic mechanisms in the hippocampus across neurodegenerative dementias: Alzheimer's disease, Down syndrome, and Parkinson's disease NPJ dementia · 2025-10-27 · usefulness score 41/100
• Mitochondrial dysfunction in down syndrome: molecular mechanisms and therapeutic targets Molecular medicine (Cambridge, Mass.) · 2018-03-15 · usefulness score 41/100

Also tagged “down”

527 studies in the library carry the topic tag “down”; these are this study's neighbours in a fixed, alphabetical-by-hash tour of them, not the closest in content. All 527 tagged studies.

• Prevalence of dementia in adults with and without Down syndrome American journal of mental retardation : AJMR · 1996-01-01 · usefulness score 38/100 · Down syndrome and Alzheimer's
• Neuropathology of Down syndrome and Alzheimer disease American journal of medical genetics. Supplement · 1990-01-01 · usefulness score 36/100 · Down syndrome and Alzheimer's
• Differential processing of amyloid-beta precursor protein directs human embryonic stem cell proliferation and differentiation into neuronal precursor cells The Journal of biological chemistry · 2009-06-19 · usefulness score 42/100 · Down syndrome and Alzheimer's

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More on Down syndrome and Alzheimer's

• A review that covers this ground Loss of Proteostasis and Early-Onset Neurodegeneration in Down Syndrome: From Mechanisms to Interventions Antioxidants (Basel, Switzerland) · 2026-04-21 · usefulness score 39/100
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• Newest in this subject Memory and Plasma pTau217 Refine Prognosis in Down Syndrome Annals of neurology · 2026-10-02 · Peer-reviewed · usefulness score 47/100

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