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Sensory cells for hearing and balance are fast-developing, UVA researchers find

CHARLOTTESVILLE, Va., Sept. 14 The functional development of hair cells in the inner ear that mediate hearing and balance takes place over a period of just one day in mouse embryos, according to a study by a research team at the University of Virginia Health System.

The U.Va. scientists found that three essential elements for development in the mouse inner ear appear between day 16 and day 17 of gestation, roughly equivalent to the late second trimester or early third trimester in the human fetus. The finding is important for ongoing research on regeneration of sensory hair cells in the human inner ear, say researchers, writing in the October edition of Nature Neuroscience, found online at www.nature.com/neuro.

"We were surprised that development of hair cells in the inner ear takes place so rapidly," said researcher Jeffrey R. Holt, an assistant professor of neuroscience and otolaryngology at U.Va. "Suddenly, the hair cells began working. To eventually discover how to regenerate hair cells in the human ear, we have to know when and how the original hair cells develop. That's why this research is so central to our knowledge."

The next challenge for scientists is to discover the molecular "switches" that turn on inner ear hair cells. "Scientists at U.Va. and elsewhere are working to test stem cells to see if they can develop into hair cells," Holt said. "If we can find the molecular process, we can potentially turn another cell type into an inner ear hair cell." The researchers said they are now assembling a list of processes these important cells go through to develop correctly. "We know the sequence," said study co-author Gwnalle Gloc, an assistant professor of neuroscience and otolaryngology. "Now we can look at different cell types and see if they are on the right track to produce hair cells."

In the lab, Holt and Gloc found that hair cell transduction in mice, or the response to movement of hair bundles associated with hearing
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Contact: Bob Beard
reb8e@virginia.edu
434-982-4490
University of Virginia Health System
14-Sep-2003


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