The short version
- Inhibiting the Notch signalling pathway prompted some cochlear supporting cells to convert into sound-sensing hair cells in live-tissue imaging.
- Mammals cannot regrow hair cells, which is why most sensorineural hearing loss is permanent; this is mouse and tissue work, with no conversion rate reported.
- It joins a 2026 mouse study yielding about 2,000 regenerated hair-cell-like cells and an AI imaging tool that counts them 50 times faster.
Hair cells in the cochlea turn sound into nerve signals, and in mammals they do not grow back once lost, which is the root of most permanent hearing loss. A Tel Aviv University team with US collaborators, writing in Science Advances and reported by Hearing Review on June 30, used live-tissue imaging and single-cell analysis to show that inhibiting the Notch signalling pathway prompts a subset of neighboring supporting cells to convert into hair cells.
This is mouse and tissue work. The press account gives no conversion rate, so it is not yet possible to say how many hair cells a treated cochlea gains, or whether the new cells connect to the auditory nerve and respond to sound. It joins two other 2026 results: a study that produced roughly 2,000 regenerated hair-cell-like cells in mouse cochlea, against about 3,000 native ones, and UC San Diego’s VASCilia AI tool, published in January, which images hair cells in 3D about 50 times faster than before. Together they make the regeneration question countable in a way it was not a few years ago.
A human therapy is years away. What changed this year is that one molecular switch has been shown to work in living tissue and the result can be measured.
