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Updated: Apr 20, 2026
05:55
Dextran Labeling and Uptake in Live and Functional Murine Cochlear Hair Cells
Published on: February 8, 2020
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Ferritin light-chain contributes to hair cells function and survival
Chloé P Petit1, Sahia Mahaman Bachir Dodo1, Lina María Jaime Tobón1
1INM, Univ Montpellier, Inserm, Montpellier, France.
Communications Biology
|April 18, 2026
Summary
Ferritin light-chain deficiency causes hearing loss in mice by damaging cochlear hair cells. Some mice show normal hearing but increased vulnerability to noise, indicating ferritin
Area of Science:
- Otolaryngology
- Cellular Biology
- Genetics
Background:
- Iron is vital for cellular functions like oxygen transport and mitochondrial respiration.
- Maintaining intracellular iron homeostasis is crucial to prevent oxidative stress.
- Ferritin is the primary intracellular iron-storage protein.
Purpose of the Study:
- To investigate the role of ferritin light-chain (Ftl) in cochlear function and hair cell survival.
- To analyze the impact of genetic ablation of Ftl on auditory thresholds and hair cell morphology.
- To explore potential environmental factors influencing Ftl knockout phenotypes.
Main Methods:
- Generation and phenotypic analysis of Ftl knockout (Ftl-/-) mice.
- Auditory threshold measurements (High-Threshold vs. Low-Threshold phenotypes).
- Microscopic examination of cochlear hair cells (outer and inner) and patch-clamp recordings of inner hair cells.
Main Results:
- Ftl-/- mice exhibited two phenotypes: hearing loss (HT) and normal hearing (LT).
- HT mice showed significant degeneration of outer hair cells and splayed hair bundles in inner hair cells.
- Patch-clamp recordings revealed altered calcium currents in inner hair cells of HT mice; LT mice were more susceptible to acoustic injury.
Conclusions:
- Ferritin light-chain plays a critical role in maintaining cochlear hair cell function and survival.
- Ftl deficiency can lead to distinct auditory phenotypes, potentially influenced by environmental factors.
- Understanding Ftl's role may offer insights into preventing or treating hearing loss.
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