Alzheimer’s disease is the most common cause of dementia and affects millions of people worldwide.
For decades, scientific efforts have concentrated on changes within the brain, particularly the buildup of beta-amyloid proteins that disrupt communication between nerve cells.
More recently, researchers have begun to examine whether age-related changes elsewhere in the body also shape brain health.
Growing interest in blood-based mechanisms
This shift has been driven by earlier findings showing that blood-borne factors can affect inflammation, tissue repair, and cognitive function.
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As a result, Alzheimer’s researchers are increasingly exploring whether the circulatory system may influence disease progression, either by accelerating damage or offering protection.
Testing young and old blood in mice
The authors of a new study published in the journal Aging investigated this question using mice genetically modified to develop Alzheimer’s-like symptoms.
Over several months, the animals received blood transfusions from either young or old donor mice.
Memory tests and brain tissue analyses revealed clear differences.
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The study reported that mice receiving blood from older donors showed poorer memory and more pronounced disease-related changes.
In contrast, mice given blood from younger donors performed better on memory tasks.
According to the MELISA Institute, protein analyses also showed changes in molecules essential for communication between brain cells, indicating that blood-derived factors can influence key biological processes in the brain.
Results and limitations
The findings are based solely on animal experiments.
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Alzheimer’s research has often produced promising results in mice that later failed to translate to humans, where the disease develops over decades and is influenced by many factors.
Even so, the study adds to evidence that Alzheimer’s may be shaped by aging processes throughout the body, not only by changes inside the brain.
Sources: Science Daily, and Aging.
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