Balance-sensing structures deteriorate in older mice
Comparisons of young and old mice found damaged sensory projections and weaker electrical responses before detectable loss of balance-sensing cells.
Limit: Age comparisons did not track the sequence of changes in individual cells
Edited by Boris Djordjevic · AgingResearch.News
In an animal experiment, researchers compared male and female CBA/J mice aged 2–2.5 months with mice aged 22–24 months. They examined inner-ear hair cells, which sense movement and help maintain balance, using measurements of gene activity, imaging and electrical recordings.
Old balance-sensing hair cells had gene activity patterns linked to cellular aging, problems with the cells’ energy-producing structures and impaired protein maintenance. Genes involved in maintaining hair bundles—the cells’ movement-sensing projections—and converting movement into electrical signals also changed. Imaging showed deteriorating hair bundles, while electrical recordings showed reduced conversion of movement into signals. The researchers found no significant reduction in balance-sensing hair cell density in the regions examined. They concluded that structural and functional deterioration preceded cell loss.
Why it matters
Age-related balance dysfunction is debilitating, but its molecular causes remain poorly understood. The work points to the machinery that senses movement as a focus for understanding how balance changes with age.
Caveats
The comparisons between age groups did not track the sequence of changes in individual cells. These experiments were in mice, not people.
- Cellular senescence
- Mechanotransduction
- Proteostasis
- Mitochondrion
- Age-related vestibular dysfunction
- Mice
The paper
Molecular and Cellular Hallmarks of Age-Related Vestibular Hair Cell Degeneration
Creighton University
Advanced Science, Jun 26, 2026, Open access
