Has already been mentioned and some discussion here: University of Rochester Researchers Regrow Sensory Hair Cells
I think the most positive thing is that along with the new hair cells there were indications that there were signs that these hair cells were ‘attracting’ nerve endings ie they were potentially connecting to neural pathways. I did a bit of reading on this particular signalling pathway (understanding about 1% if that) and there seems to be a bit of a relationship between it and the notch signalling pathway. Notch is one of the pathways targeted by Frequency Therapeutics’ drug FX-322. These signalling pathways seem to interact in complex ways.
I wish them luck with their research. Perhaps we are finally going to see the breakthrough, promised years ago, and still not happened. i`ll join the queue….