What this means
This review looks at small molecules carried in body fluids that may help exercise affect the aging brain. The authors say these ideas are not yet proven and need more testing before they can be trusted as markers of brain health.
Plain-English summary written by an AI model from the abstract. The original is below.
- Who it was tested in
- A review of earlier studies; no new participants
- Kind of research
- A summary of earlier studies
The science
- Original title
- Exercise-Induced Extracellular Vesicle-Associated miRNAs in Cognitive Aging of Older Adults: A Narrative Review.
- Authors
- Małkowska P, Sochacka M, Proia P et al.
- Journal
- International journal of molecular sciences
- Published
- Oct 16, 2026
- Study type
- Review · in humans
- PMID
- 42883921 ↗
Abstract
Cognitive aging involves chronic neuroinflammation, microglial dysregulation, vascular dysfunction, oxidative stress, and impaired neuroplasticity, and physical activity is one of the few modifiable interventions known to influence all of these processes simultaneously. The molecular mechanisms linking peripheral exercise adaptations to the aging brain, however, remain incompletely defined. This review examines exercise-responsive, EV-associated miRNAs as candidate mediators of this communication across four mechanistic domains: inflammatory signaling (miR-146a, miR-155, miR-223), microglial regulation (miR-124), neurotrophic and synaptic signaling (miR-132, miR-206), and vascular/blood-brain barrier function (miR-126). For each candidate, we distinguish evidence obtained by direct demonstration of an exercise-responsive, EV-associated change from evidence obtained by triangulating separate, non-vesicular, or non-exercise studies-a distinction largely absent from the existing literature. We also evaluate EV-miRNAs as candidate biomarkers of individual exercise responsiveness, separating analytical validity and biological association, for which evidence exists, from predictive validity and clinical utility, for which it does not. Standardized EV characterization, longitudinal exercise interventions, and integration with neuroinflammatory, neurovascular, and cognitive outcomes are needed before these candidates can be considered validated biomarkers of brain health in aging.
Małkowska P, Sochacka M, Proia P et al. Exercise-Induced Extracellular Vesicle-Associated miRNAs in Cognitive Aging of Older Adults: A Narrative Review. International journal of molecular sciences. 2026. doi:10.3390/ijms27198677. PMID: 42883921. https://pubmed.ncbi.nlm.nih.gov/42883921/
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