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  1. Home
  3. Intestinal Interoceptive Dysfunction Drives Age-associated Cognitive Decline.
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  3. Intestinal Interoceptive Dysfunction Drives Age-associated Cognitive Decline.

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Intestinal interoceptive dysfunction drives age-associated cognitive decline.

Timothy O Cox1,2, Ashwarya S Devason1, Alan de Araujo3,4

  • 1Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

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|March 12, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Ageing impairs memory by altering gut bacteria, which disrupts gut-brain signals and hippocampal function. Interventions targeting this pathway can restore memory in aged mice.

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Area of Science:

  • Neuroscience
  • Microbiology
  • Gerontology

Background:

  • Ageing is associated with cognitive decline, particularly memory impairment.
  • The gut microbiome and its signaling pathways are increasingly recognized as modulators of brain function.
  • Mechanisms linking gut-brain communication to age-related memory loss are not well understood.

Purpose of the Study:

  • To map the ageing microbiome and its functional impact on cognitive decline.
  • To identify specific gut-brain signaling pathways involved in age-related memory impairment.
  • To explore potential interventions for enhancing memory in aged individuals.

Main Methods:

  • High-resolution mapping of the mouse microbiome throughout its lifespan.
  • Investigating the role of medium-chain fatty acid-producing bacteria (e.g., Parabacteroides goldsteinii) and GPR84 signaling.
  • Assessing vagal afferent neuron function and hippocampal activation.
  • Testing interventions including phage therapy, GPR84 inhibition, and vagal activity restoration.

    • Main Results:

    • Accumulation of specific gut bacteria drives inflammation via GPR84 signaling, impairing vagal nerve function.
    • This disruption weakens interoceptive signals to the brain, leading to hippocampal dysfunction and memory loss.
    • Interventions such as targeting Parabacteroides with phages or inhibiting GPR84 successfully enhanced memory in aged mice.

    Conclusions:

    • Interoceptive dysfunction plays a critical role in age-related cognitive decline.
    • Modulating gut-brain communication offers a promising therapeutic strategy to counteract memory loss.
    • Interoceptomimetics stimulating gut-brain signaling may be beneficial for brain ageing.