Research Reveals Key Insights into Vestibular Hair Cell Degeneration & Potential for Early Intervention
A new study from the University of Barcelona (UB) has shed light on the degenerative process affecting vestibular hair cells – the sensory receptors crucial for balance and spatial orientation. Researchers, led by professor Jordi Llorens of the Faculty of Medicine and Health Sciences, discovered a consistent cellular response to toxic stress that could pave the way for earlier diagnosis and potential therapies to prevent permanent balance disorders.
The vestibular system relies on these hair cells to detect movement. critically, these cells do not regenerate onc lost. Loss of these cells can lead to a range of debilitating symptoms, including difficulty with coordination (like riding a bike), blurred vision during movement, falls, disorientation, dizziness, and vertigo.
Using RNA-seq analysis – a technique mapping gene expression – the team investigated how the vestibular system responds to toxic damage. They found that initially, hair cells attempt to adapt to progressive damage by reducing the expression of genes responsible for maintaining their shape and function. while this represents a resilience mechanism, it is indeed ultimately temporary.
Importantly, the research revealed that early damage is reversible. if the source of toxicity is removed in time,the connections between hair cells and neurons can be repaired,restoring function. This finding is significant as current loss of vestibular function is frequently enough considered certain.
The study’s findings were consistent across four different models of chronic ototoxicity, utilizing two animal species and two distinct toxins. this suggests the observed degradation process isn’t specific to a particular poison, but rather a fundamental response to chronic toxic stress affecting hair cells irrespective of the cause.
researchers identified a specific gene, Vsig10l2, whose expression is dramatically reduced in all models analyzed. This makes Vsig10l2 a promising biomarker for detecting chronic ototoxicity in preclinical studies, offering a tool to measure cellular stress and assess the effectiveness of potential treatments.
The implications of this research extend beyond ototoxicity.The team hypothesizes that this response may be a generic reaction to chronic stress and could be relevant to other conditions involving progressive hair cell loss, such as age-related vestibular decline. They also suspect a similar response may occur in auditory hair cells, possibly improving understanding of certain types of deafness. Current research,funded by a Marató de TV3 project,is investigating the role of this vestibular dysfunction in patients with vestibular schwannoma,a tumor affecting the audiovestibular nerve.
The study, titled “Chronic vestibular ototoxicity: a extensive transcriptomic analysis reveals conserved hair cell stress response and identifies novel biomarkers,” was published in J Biomed Sci (2025, 32, 118). https://doi.org/10.1186/s12929-025-01180-4
