Alzheimer’s Mutations Disrupt Nerve-to-Muscle Signals
Genetic mutations linked to familial Alzheimer’s disease can interfere with peripheral nerves controlling muscle movement without any involvement from the brain or spinal cord, Science Daily reported.
Researchers at the University of Central Florida and healthcare technology company Hesperos discovered that motor neurons carrying these inherited mutations disrupt the connections responsible for muscle contraction. The findings suggest that physical changes in walking, balance, and coordination may serve as early warning signs of the disease long before cognitive decline begins, according to the study published in Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association.
University of Central Florida Study Details
Led by James Hickman, a professor at the UCF Nanoscience Technology Center, and Research Professor Xiufang “Nadine” Guo, the research team investigated familial Alzheimer’s, a rare inherited form of the condition that typically manifests in individuals aged 40 to 65. The work was funded by the National Institutes of Health’s National Institute on Aging.
To isolate peripheral nerve function, scientists utilized “human-on-a-chip” technology developed by Hesperos. This laboratory platform recreates the neuromuscular junction using human stem-cell-derived motor neurons combined with healthy muscle cells, deliberately omitting a brain or spinal cord to observe how the mutations affect nerve-to-muscle communication directly.
Peripheral Nervous System Impact
“Motor deficits may be an earlier indication,” Guo said. “If we can detect those changes and intervene earlier, that could help delay the onset of central nervous system symptoms.”
The experiments demonstrated that altered motor neurons fail to signal muscles consistently, leading to premature fatigue and reduced coordination. This peripheral impairment indicates that treatments focused exclusively on the brain may miss critical pathology elsewhere in the body. “This is the first time it’s been demonstrated that deficits in the peripheral nervous system can arise directly from these mutations,” Hickman said. “It means drugs that target the brain may not fix problems in the rest of the body.”
Frequently Asked Questions About Early Alzheimer’s Signs
What specific movement changes do researchers associate with early Alzheimer’s?
Scientists observe alterations in balance, coordination, and gait, which can appear years before clear cognitive difficulties become apparent. These physical symptoms stem from impaired communication at the neuromuscular junction.
How does human-on-a-chip technology work in this research?
The miniature laboratory platform brings different types of human cells together under controlled conditions to recreate specific biological functions. By building a neuromuscular model without a brain or spinal cord, researchers proved that Alzheimer’s mutations can disrupt nerve-to-muscle signals independently of the central nervous system.
Who funded and conducted the study?
The research was funded by the National Institutes of Health’s National Institute on Aging and led by James Hickman and Xiufang “Nadine” Guo at the University of Central Florida in collaboration with Hesperos scientists.
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