Atoh1 expression levels define the fate of rat cochlear nonsensory epithelial cells in vitro

Luo,Wen‑Wei; Yang,Juan‑Mei; Han,Zhao; Yuan,Ya‑Sheng; Sheng,Hai‑Bin; Liu,Xiang; Chi,Fang‑Lu

doi:10.3892/mmr.2014.2202

July-2014 Volume 10 Issue 1

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July-2014 Volume 10 Issue 1

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Atoh1 expression levels define the fate of rat cochlear nonsensory epithelial cells in vitro

Authors:
- Wen‑Wei Luo
- Juan‑Mei Yang
- Zhao Han
- Ya‑Sheng Yuan
- Hai‑Bin Sheng
- Xiang Liu
- Fang‑Lu Chi
View Affiliations / Copyright

Affiliations: Department of Otolaryngology‑Head and Neck Surgery, Eye and ENT Hospital of Fudan University, Xuhui, Shanghai 200031, P.R. China

Copyright: © Luo et al. This is an open access article distributed under the terms of Creative Commons Attribution License [CC BY_NC 3.0].
Pages: 15-20
|
Published online on: April 30, 2014

https://doi.org/10.3892/mmr.2014.2202
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Abstract

Atonal homolog 1 (Atoh1) is a basic helix‑loop‑helix transcription factor that is essential for inner ear hair cell differentiation. Previous studies have reported that Atoh1 gene transfer induces the production of ectopic hair cell‑like cells (EHCLCs). In the present study, the effect of different Atoh1 expression levels and the duration of EHCLC formation on the lesser epithelial ridge (LER) of cochleae was examined using a human adenovirus serotype 5 (Ad5) vector encoding atoh1 and the reporter gene EGFP. Different Ad5‑EGFP‑atoh1/Ad5‑EGFP virus titers were added to cultured cochlear explants and EHCLCs were detected in the LER at various time points. The results demonstrated that GFP alone did not induce EHCLCs. By contrast, Atoh1 expression induced EHCLCs as early as 2.5‑5 days following EGFP‑atoh1 infection in the LER and depending upon the viral titer, the number of EHCLCs increased with time. Higher Ad5‑EGFP‑atoh1 titers induced enhanced Atoh1 expression, resulting in an increase in EHCLCs. Lower Ad5‑EGFP‑atoh1 titers required more time for EHCLC formation and very low titers of Ad5‑EGFP‑atoh1 induced only weak Atoh1 expression and did not trigger EHCLC formation. In conclusion, the present study utilized an appropriate Ad5‑EGFP‑atoh1 titer range to induce Atoh1 expression and the subsequent production of EHCLCs. The results revealed that the Atoh1 expression level defined the fate of LER cells as either EHCLCs or nonsensory epithelial cells. This evidence may provide an important guideline for future studies into gene therapy strategies for the treatment of deafness.

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Journals

International Journal of Molecular Medicine

International Journal of Oncology

Molecular Medicine Reports

Oncology Reports

Experimental and Therapeutic Medicine

Oncology Letters

Biomedical Reports

Molecular and Clinical Oncology

World Academy of Sciences Journal

International Journal of Functional Nutrition

International Journal of Epigenetics

Medicine International

Atoh1 expression levels define the fate of rat cochlear nonsensory epithelial cells in vitro

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