NDLI: A Comparative Study of Age-Related Hearing Loss in Wild Type and Insulin-Like Growth Factor I Deficient Mice

Content Provider	PubMed Central
Author	Riquelme, Raquel Cediel, Rafael Contreras, Julio Lourdes, Rodriguez-de La Rosa Silvia, Murillo-cuesta Catalina, Hernandez-sanchez Zubeldia, Jose M. Cerdan, Sebastian Isabel, Varela-nieto
Copyright Year	2010
Abstract	Insulin-like growth factor-I (IGF-I) belongs to the family of insulin-related peptides that fulfils a key role during the late development of the nervous system. Human IGF1 mutations cause profound deafness, poor growth and mental retardation. Accordingly, Igf1 −/− null mice are dwarfs that have low survival rates, cochlear alterations and severe sensorineural deafness. Presbycusis (age-related hearing loss) is a common disorder associated with aging that causes social and cognitive problems. Aging is also associated with a decrease in circulating IGF-I levels and this reduction has been related to cognitive and brain alterations, although there is no information as yet regarding the relationship between presbycusis and IGF-I biodisponibility. Here we present a longitudinal study of wild type Igf1 +/+ and null Igf1 −/− mice from 2 to 12 months of age comparing the temporal progression of several parameters: hearing, brain morphology, cochlear cytoarchitecture, insulin-related factors and IGF gene expression and IGF-I serum levels. Complementary invasive and non-invasive techniques were used, including auditory brainstem-evoked response (ABR) recordings and in vivo MRI brain imaging. Igf1 −/− null mice presented profound deafness at all the ages studied, without any obvious worsening of hearing parameters with aging. Igf1 +/+ wild type mice suffered significant age-related hearing loss, their auditory thresholds and peak I latencies augmenting as they aged, in parallel with a decrease in the circulating levels of IGF-I. Accordingly, there was an age-related spiral ganglion degeneration in wild type mice that was not evident in the Igf1 null mice. However, the Igf1 −/− null mice in turn developed a prematurely aged stria vascularis reminiscent of the diabetic strial phenotype. Our data indicate that IGF-I is required for the correct development and maintenance of hearing, supporting the idea that IGF-I-based therapies could contribute to prevent or ameliorate age-related hearing loss.
Related Links	http://dx.doi.org/10.3389/fnana.2010.00027
Starting Page	27
File Format	PDF
ISSN	16625129
e-ISSN	16625129
Journal	Frontiers in Neuroanatomy
Volume Number	4
Language	English
Publisher	Frontiers Research Foundation
Publisher Date	2010-01-01
Access Restriction	Open
Rights Holder	Frontiers Research Foundation
Subject Keyword	Anatomy Cellular and Molecular Neuroscience Neuroscience (miscellaneous) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Anatomy Cellular and Molecular Neuroscience

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