All of the functions of these cells are not known, but one role is to maintain high potassium concentrations in the fluid (endolymph) surrounding the hair cells of the cochlea; these pigment cells are critical for survival of the stria and the stria is critical for
survival of the hair cells.
«To our knowledge, our model is the first in which expression
of a single gene in postnatal
hair cells results in
hair cell survival and hearing preservation in mice that otherwise suffer from age - related and noise - induced hearing loss,» Dr. Chen said.
«Work continues to identify the other factors, including small molecules, necessary to not only promote the maturation and
survival of the newly generated
hair cells, but also increase their number,» Zuo said.
In recent years, researchers have developed so - called «senolytic» drugs that wipe out senescent
cells in aging mice and mouse models
of age - related disease, exploiting the high dependence
of these
cells on specific biochemical
survival pathways.9, 10 In these studies, senolytic drugs have restored exercise capacity9 and formation
of new blood and immune precursor
cells11 in aging mice to near youthful norms, and prevented or treated mouse models
of diseases
of aging like osteoarthritis, 12 fibrotic lung disease, 13
hair loss, 14 atherosclerosis, 15,16 and age - related diseases
of the heart itself.9 UNITY Biotechnology is leading a growing charge toward the clinic, with human clinical trials expected to begin in 2019.