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Front Aging Neurosci. 2021 Sep 16;13:718426. doi: 10.3389/fnagi.2021.718426. eCollection 2021.

Innate Immune System Activation and Neuroinflammation in Down Syndrome and Neurodegeneration: Therapeutic Targets or Partners?.

Frontiers in aging neuroscience

Md Mahiuddin Ahmed, Noah R Johnson, Timothy D Boyd, Christina Coughlan, Heidi J Chial, Huntington Potter

Affiliations

  1. Department of Neurology, University of Colorado Anschutz Medical Campus, Aurora, CO, United States.
  2. University of Colorado Alzheimer's and Cognition Center, University of Colorado Anschutz Medical Campus, Aurora, CO, United States.
  3. Linda Crnic Institute for Down Syndrome, University of Colorado Anschutz Medical Campus, Aurora, CO, United States.
  4. Partner Therapeutics, Inc., Lexington, MA, United States.

PMID: 34603007 PMCID: PMC8481947 DOI: 10.3389/fnagi.2021.718426

Abstract

Innate immune system activation and inflammation are associated with and may contribute to clinical outcomes in people with Down syndrome (DS), neurodegenerative diseases such as Alzheimer's disease (AD), and normal aging. In addition to serving as potential diagnostic biomarkers, innate immune system activation and inflammation may play a contributing or causal role in these conditions, leading to the hypothesis that effective therapies should seek to dampen their effects. However, recent intervention studies with the innate immune system activator granulocyte-macrophage colony-stimulating factor (GM-CSF) in animal models of DS, AD, and normal aging, and in an AD clinical trial suggest that activating the innate immune system and inflammation may instead be therapeutic. We consider evidence that DS, AD, and normal aging are accompanied by innate immune system activation and inflammation and discuss whether and when during the disease process it may be therapeutically beneficial to suppress or promote such activation.

Copyright © 2021 Ahmed, Johnson, Boyd, Coughlan, Chial and Potter.

Keywords: Alzheimer’s disease; Down syndrome; GM-CSF (granulocyte-macrophage colony-stimulating factor); amyloid-β; apolipoprotein E; drug repurposing and discovery; inflammation; innate immune system

Conflict of interest statement

HP and TB are two of the inventors on several U.S. patents owned by the University of South Florida, but not licensed. TB is an employee of Partner Therapeutics. The remaining authors declare that the

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