{
  "id": 4690024,
  "title": "Treadmill running restores memory in Alzheimer’s mice by boosting a key brain pathway",
  "url": "https://urgent.news/2026/08/31/treadmill-running-restores-memory-in-alzheimers-mice-by-boosting-a",
  "topic": "health",
  "section": "Health & Medicine",
  "published": "2026-08-31T18:00:24.000Z",
  "source": {
    "name": "PsyPost",
    "slug": "psypost",
    "url": "https://www.psypost.org/treadmill-running-restores-memory-in-alzheimers-mice-by-boosting-a-key-brain-pathway/"
  },
  "original_language": "en",
  "account": "A recent study on mice suggests that regular exercise on a treadmill may reverse memory loss and alleviate brain damage caused by Alzheimer's disease. The research, published in Scientific Reports, links these positive effects to the activation of a particular cellular communication pathway that promotes brain health and decreases inflammation. Alzheimer's disease, a progressive brain disorder marked by memory loss and cognitive decline, is caused by the accumulation of toxic protein fragments called amyloid plaques and tau tangles. These clusters interfere with neuronal communication and instigate chronic inflammation, primarily driven by immune cells like microglia and astrocytes. A 2024 review highlighted that physical activity can alleviate brain inflammation by restoring microglia and astrocytes into a protective state. However, the precise mechanism through which exercise improves brain health remains unclear. In this new study, researchers from Sungkyunkwan University focused on a specific signaling system called the brain-derived neurotrophic factor (BDNF) pathway. BDNF is a protein that acts like \"fertilizer\" for the brain, supporting neuron survival, growth, and the formation of new connections. When BDNF binds to its target receptor, TrkB, it triggers a sequence of events inside the cell that supports survival and inhibits cell death. The scientists studied 40 male mice, with half genetically engineered to develop Alzheimer's features, including amyloid plaques, tau tangles, and memory issues, while the other half were healthy. Both groups of Alzheimer's mice were randomly divided between an exercise group and a sedentary control group. The exercising mice ran on a motorized treadmill for 30 minutes daily, five times a week, for 20 weeks, gradually increasing the treadmill's speed to maintain a consistent challenge. After 20 weeks, the mice were tested for cognitive function using a water maze, where they had to locate a hidden platform. The sedentary Alzheimer's mice exhibited significant memory impairments, taking longer to locate the platform compared to healthy mice. In contrast, the exercising Alzheimer's mice performed as well as healthy mice, demonstrating full recovery of their spatial learning and memory abilities. Cellular analysis revealed that exercising Alzheimer's mice had lower levels of amyloid plaques and tau tangles in the hippocampus, a crucial brain region for memory. The treadmill regimen activated the BDNF-TrkB signaling pathway, leading to decreased inflammatory molecules in the blood and brain. Exercise also reoriented brain immune cells, shifting microglia and astrocytes from a harmful, inflammatory state to a rejuvenating, anti-inflammatory state. These findings align with a 2024 PsyPost report that found voluntary physical activity reversed cognitive impairments and prompted structural changes in astrocytes near amyloid plaques in an Alzheimer's mouse model. Additionally, regular aerobic exercise protected the brain's infrastructure by improving mitochondrial function and reducing myelin damage and neuronal cell death. However, the study's limitations include its focus on a mouse model, which may not directly translate to human Alzheimer's patients. The mice commenced exercising at four months of age, corresponding to the early stages of the disease in this specific genetic model, raising questions about the potential benefits of starting an exercise regimen later in the disease's progression. Since the researchers did not directly block the BDNF-TrkB pathway to confirm that its activation is the sole cause of the improvements, it remains challenging to definitively establish this pathway as the exclusive driver of the observed benefits. Exercise induces a multitude of chemical messengers from muscles, which may also contribute to the observed effects.",
  "summary": "A new study suggests that regular treadmill running can fully reverse memory loss and reduce toxic brain plaques in mice with Alzheimer’s disease. The benefits appear linked to a specific cellular pathway that boosts brain health.",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}