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Cochlear Surface Preparation in the Adult Mouse
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Early Noise-Induced Hearing Loss Accelerates Presbycusis Altering Aging Processes in the Cochlea.
Anna Rita Fetoni1,2,3, Anna Pisani2, Rolando Rolesi1,2
1Fondazione Policlinico Universitario A. Gemelli IRCCS, Rome, Italy.
Frontiers in Aging Neuroscience
|February 24, 2022
Summary
Early noise-induced hearing loss accelerates age-related hearing loss by damaging cochlear structures and worsening oxidative stress and vascular dysfunction. Understanding these mechanisms can help develop therapies against age-related diseases.
Area of Science:
- Otolaryngology
- Neuroscience
- Gerontology
Background:
- Hearing loss is linked to aging processes like dementia and age-related hearing loss (ARHL).
- Molecular mechanisms connecting midlife hearing impairment and ARHL are not fully understood.
Purpose of the Study:
- To investigate if early noise-induced hearing loss (NIHL) impacts age-related cochlear dysfunction using a mouse model.
- To identify shared pathological markers between NIHL and ARHL.
Main Methods:
- Utilized C57BL/6 mice as an animal model for ARHL.
- Evaluated the effects of early NIHL on cochlear pathology and molecular markers.
Main Results:
- NIHL exacerbated ARHL, causing sensory-neural cochlear epithelium damage and synaptopathy.
- Noise exposure worsened redox imbalance (increased ROS, lipid peroxidation, altered antioxidant response) and vascular dysfunction (increased HIF-1α and VEGFC) in the cochlea.
Conclusions:
- Early hearing loss can accelerate ARHL and associated cochlear pathologies.
- Identifying these molecular links offers potential therapeutic targets for mitigating environmental risk factors in age-related diseases.
Keywords:
acoustic traumaage-related hearing lossaginghearing lossoxidative stressvascular dysfunctionMore Related Videos
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