Discovery reveals how nervous system helps control length of protective nerve coatings
Researchers at Upstate Medical University have identified a key mechanism that helps determine the length of myelin, the protective coating that surrounds many nerve fibers and allows signals to travel efficiently through the nervous system.
Researchers at Upstate Medical University have uncovered a crucial mechanism that governs the length of myelin, the protective sheath surrounding nerve fibers in the nervous system. Published in PLOS Biology, this discovery sheds new light on how the brain and spinal cord organize the complex wiring of the nervous system. Myelin, produced by specialized cells called oligodendrocytes, wraps around nerve fibers, akin to insulation on electrical wires.
The length of these myelin segments varies throughout the nervous system, directly impacting the speed at which nerve signals travel.
The study, led by senior author Marie Bechler, Ph.D., assistant professor of cell and developmental biology and neuroscience and physiology, reveals that a protein named Piezo1 plays a pivotal role in this process. Myelin thickness and length are vital for efficient nerve signaling. Damage to myelin, as seen in conditions like multiple sclerosis, disrupts neuron communication, leading to various debilitating symptoms affecting body control, fatigue, vision, cognition, and movement.
For years, it was known that thicker nerve fibers tend to have longer myelin segments, but the cellular mechanism behind this relationship remained elusive. The researchers discovered that oligodendrocytes utilize Piezo1 to detect the diameter of the nerve fibers they envelop. This information helps these cells determine the length of each myelin segment, establishing precise patterns of myelin along nerve fibers.
Piezo1 appears particularly significant during the early stages of myelin formation when oligodendrocytes are actively constructing and extending the myelin sheath. Understanding this mechanism not only clarifies how the nervous system regulates myelin structure but also opens avenues for developing therapies to promote myelin growth in diseases where it is lost or damaged.
The study, conducted by a team from Upstate Medical University, including first author Amanda R. Young, offers a foundational insight into disorders involving myelin and nerve function.
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