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miR-34a/Bcl-2 signaling pathway contributes to age-related hearing loss by modulating hair cell apoptosis

Qiuhong Huang1, Yiqing Zheng1, Yongkang Ou1

  • 1Department of Otolaryngology-HNS, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen university, 107 Yanjiang West Rd, Guangzhou 510120, China; Institute of Hearing and Speech-Language Science, Sun Yat-sen University, China.

Neuroscience Letters
|July 31, 2017
PubMed

Insights

MicroRNAs, like miR-34a, are linked to aging. This study reveals miR-34a/Bcl-2 signaling drives age-related hearing loss by promoting cochlear hair cell apoptosis, offering a therapeutic target.

Area of Science:

  • Otolaryngology
  • Molecular Biology
  • Gerontology

Background:

  • MicroRNAs regulate gene expression and are implicated in age-related diseases.
  • Age-related hearing loss (AHL) is a significant health concern with complex underlying mechanisms.
  • The miR-34a/Bcl-2 pathway's role in cochlear aging is not fully understood.

Purpose of the Study:

  • To investigate the involvement of the miR-34a/Bcl-2 signaling pathway in age-related hearing loss (AHL).
  • To determine the effect of miR-34a on Bcl-2 expression and apoptosis in auditory cells.

Main Methods:

  • Utilized an age-related hearing loss (AHL) mouse model (C57BL/6).
  • Quantified miR-34a and Bcl-2 expression in cochlear tissues from aging mice.
  • Administered miR-34a mimetic and inhibitor in a mouse auditory cell line (HEI-OC1) to assess apoptosis.

Main Results:

  • miR-34a expression increased, while Bcl-2 expression decreased in the cochlea with age.
  • Overexpression of miR-34a in HEI-OC1 cells led to Bcl-2 inhibition and increased apoptosis.
  • Inhibition of miR-34a reversed these effects, reducing apoptosis.

Conclusions:

  • Age-related cochlear hair cell apoptosis is significantly linked to the miR-34a/Bcl-2 signaling pathway.
  • The miR-34a/Bcl-2 pathway represents a potential therapeutic target for mitigating age-related hearing loss.
Keywords:
ApoptosisBcl-2CochleaPresbycusismiR-34a

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