Human study · Supplements / medicine · 22 Sept 2026
Nerve-to-muscle signals fail with age as NaV1.4 drops; a ClC-1 block restored strength in animals
Source: EurekAlert / University of Missouri
What the research found
Study (people and animal models). W. David Arnold and colleagues report in The Journal of Clinical Investigation (doi 10.1172/JCI190646; paper 9 July 2026, news release 22 September 2026) that the neuromuscular junction gets less reliable with age as the muscle sodium-channel protein NaV1.4 falls. Sarcopenia affects nearly half of adults over 80. Partially blocking the chloride channel ClC-1 made aging muscle more responsive to nerve signals and improved strength in an animal model. A separate ClC-1 candidate, ignaseclant, has been studied in Charcot-Marie-Tooth disease, not as an approved treatment for ordinary age-related weakness. Educational aging notes, not a drug recommendation.
Evidence level: Human study. A study in people, but an association isn't proof of cause.
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