Alzheimer’s Gene Mutations May Disrupt Nerves Outside the Brain
Laboratory experiments suggest the disease can interfere with the nerves that drive muscle movement, possibly before memory problems become obvious.
Key points
- Researchers at the University of Central Florida studied genetic mutations linked to familial Alzheimer's disease.
- The mutations disrupted connections between nerves and muscles in a system with no brain or spinal cord.
- Movement changes may sometimes appear years before clear memory problems, the team says.
- The findings suggest brain-focused treatments may not correct problems elsewhere in the body.
- The study was funded by the National Institute on Aging and published in Alzheimer's & Dementia.
A team at the University of Central Florida (UCF) reports that inherited Alzheimer’s mutations can disturb the nerves responsible for muscle control. According to the researchers, this disruption occurs even when the brain and spinal cord play no part. The results appear in Alzheimer’s & Dementia, the journal of the Alzheimer’s Association.
The work may help explain why some patients notice changes in walking, balance or coordination well before memory problems surface. The authors suggest such movement issues could act as an earlier signal of the disease. They also warn that therapies aimed only at the brain might miss trouble elsewhere in the body.
Who conducted the study and how it was funded
James Hickman, a UCF professor based at the Nanoscience Technology Center, directed the project together with Xiufang Guo, a research professor. Colleagues at Hesperos, a healthcare technology firm, also took part. The National Institute on Aging, a branch of the National Institutes of Health, provided the funding.
Their attention centred on familial Alzheimer’s, an uncommon hereditary version of the illness. Its onset tends to come earlier in adult life, generally between 40 and 65 years old, compared with the more widespread form. The laboratory platform was built from human cells to test how these inherited changes influence movement.
The team assembled a small-scale replica of the neuromuscular junction, the site where a motor neuron relays signals to a muscle fibre. This replica had no brain and no spinal cord. Healthy muscle cells were paired with motor neurons grown from stem cells carrying the mutations.
Key findings on nerve-muscle signalling
The nerve cells carrying the mutations communicated less effectively with healthy muscle tissue. Researchers gauged how reliably nerve impulses triggered contractions, along with how long the muscles could keep contracting before fatiguing. Both readings indicated weakened nerve-to-muscle activity.
These observations point to the possibility that some movement problems linked to the disease start in the peripheral nervous system, meaning the nerves outside the brain and spinal cord. Hickman described this as the first time such deficits have been shown to arise directly from these mutations. Guo suggested that catching motor changes early might postpone symptoms affecting the central nervous system.
Limits were acknowledged. The experiments do not confirm that these changes precede memory loss in people. More work is required to judge how well the lab outcomes mirror the progression of the common forms of the illness.
Implications for detection and treatment
The findings may push researchers to look past memory when studying Alzheimer’s. Straightforward assessments of gait, coordination or nerve-to-muscle function could one day help spot disease-related changes sooner. Medicines designed for the brain might not repair abnormalities in peripheral nerves and muscles, which adds weight to this view.
Guo also pointed out that maintaining mobility could benefit brain health, because regular physical activity is tied to better thinking skills. The team sees broader uses for the human-on-a-chip approach, which may help test how drugs affect several tissues at once. Hickman said the aim is to study disease in conditions closer to the human body, a step he considers essential for better treatments.
Frequently asked questions
What did the University of Central Florida study find?
Researchers at UCF found that genetic mutations linked to familial Alzheimeru0026#039;s disease can disrupt connections between nerves and muscles. This happened in a laboratory system that contained no brain or spinal cord.
Could movement changes be an early sign of Alzheimeru0026#039;s?
The team suggests movement problems may sometimes appear years before clear memory difficulties. However, the experiments do not prove that these changes always occur before memory loss in patients.
Who funded the research?
The study was funded by the National Institute on Aging, which is part of the National Institutes of Health. The findings were published in Alzheimeru0026#039;s u0026amp; Dementia.
Sources
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