ROCHESTER, NEW YORK — In a new study published this week in the European Journal of Neuroscience, scientists have been able to regrow the sensory hair cells found in the cochlea. The research may help pave the way for new approaches to restoring lost hearing.
Research conducted in the lab of Patricia White, Ph.D., lead author of the current study and a research associate professor at the University of Rochester Medical Center (URMC) had previously identified a family of receptors in 2012 – called epidermal growth factor (EGF) – which are responsible for the activation of supporting cells in the auditory organs of birds. When triggered, these cells are said to proliferate and foster the generation of new sensory hair cells. She speculated that this signaling pathway could potentially be manipulated to produce a similar result in mammals.
“It’s funny, but mammals are the oddballs in the animal kingdom when it comes to cochlear regeneration,” said Jingyuan Zhang, Ph.D., with the University of Rochester Department of Biology and a co-author of the study. “We’re the only vertebrates that can’t do it.”
“In mice, the cochlea expresses EGF receptors throughout the animal’s life, but they apparently never drive regeneration of hair cells. Perhaps during mammalian evolution, there have been changes in the expression of intracellular regulators of EGF receptor family signaling. Those regulators could have altered the outcome of signaling, blocking regeneration. Our research is focused on finding a way switch the pathway temporarily, in order to promote both regeneration of hair cells and their integration with nerve cells, both of which are critical for hearing.” —Patricia White, Ph.D.
Hearing Restoration: Regrowing Cochlear Hair Cells
In the new study, with researchers from URMC and the Massachusetts Ear and Eye Infirmary, investigators tested the theory that signaling from the EGF family of receptors could play a role in cochlear regeneration in mammals. The researchers focused on a specific receptor called ERBB2 which is found in cochlear support cells.
The researchers investigated a number of different methods to activate the EGF signaling pathway. One set of experiments involved using a virus to target ERBB2 receptors. Another, involved mice genetically modified to over-express an activated ERBB2. A third experiment involved testing two drugs, originally developed to stimulate stem cell activity in the eyes and pancreas, that are known activate ERBB2 signaling.
The researchers found that activating the ERBB2 pathway triggered a cascading series of cellular events by which cochlear support cells began to proliferate and start the process of activating other neighboring stem cells to become new sensory hair cells. Furthermore, it appears that this process not only could impact the regeneration of sensory hair cells, but also support their integration with nerve cells.
“The process of repairing hearing is a complex problem and requires a series of cellular events,” said White. “You have to regenerate sensory hair cells and these cells have to function properly and connect with the necessary network of neurons. This research demonstrates a signaling pathway that can be activated by different methods and could represent a new approach to cochlear regeneration and, ultimately, restoration of hearing.”
Additional co-authors of the study include Jonelle Mattiacio with URMC and Quan Wang, Dunia Abdul-Aziz, and Albert Edge with Harvard Medical School. The research was supported with funding from the National Institute for Deafness and Communication Disorders (NIDCD).
- ERBB2 signaling drives supporting cell proliferation in vitro and apparent supernumerary hair cell formation in vivo in the neonatal mouse cochlea
Source: URMC, EJN