A putative role of p53 pathway against impulse noise induced damage as demonstrated by protection with Pifithrin-alpha and a Src Inhibitor

Anna Rita Fetoni, Eric C. Bielefeld, Thomas Nicotera, Donald Henderson

Risultato della ricerca: Contributo in rivistaArticolo in rivista

14 Citazioni (Scopus)

Abstract

Exposure to high-level noise leads to oxidative stress and triggers apoptosis of the hair cells. This study examined whether p53, a tumor suppressor protein, is activated in the cochlea following impulse noise exposure. Inhibition of p53 with pifithrin alpha, a specific p53 inhibitor, or KX1-004, a Src-protein tyrosine kinase inhibitor, was tested to determine if p53 inhibition could reduce noise-induced hearing loss and cochlear damage. Chinchillas were pre-treated with a local administration of pifithrin alpha or KX1-004 and exposed to impulse noise. The chinchillas were assessed for threshold shift at 1 and 24hours after the noise. At 4 or 24hours post noise, the cochleae were removed and organs of Corti were examined to assess the damage to the cells and upregulation of p53 by the noise. Apoptosis was evident in both outer hair cells and supporting cells. Phospho-p53 (Ser 15) was upregulated 4hours and 24hours after the noise. KX1-004 and pifithrin alpha both decreased threshold shift and the number of missing outer hair cells. These results indicate that p53 is involved in the early stages of noise-induced cell death and inhibition of this signaling pathway is a potential protective strategy against noise-induced hearing loss.
Lingua originaleEnglish
pagine (da-a)30-37
Numero di pagine8
RivistaNeuroscience Research
DOI
Stato di pubblicazionePubblicato - 2014

Keywords

  • ABR
  • ANOVA
  • DMSO
  • ECM
  • FAK
  • Noise
  • OHC
  • PBS
  • PFT
  • PI
  • PTK
  • PTS
  • ROS
  • Src inhibitor
  • TDT
  • TTS
  • Tucker Davis Technologies
  • analysis of variance
  • apoptosis
  • auditory brainstem response
  • dimethyl sulfoxide
  • extra-cellular matrix
  • focal adhesion kinase
  • outer hair cell
  • p53
  • permanent threshold shift
  • phosphate buffered saline
  • pifithrin alpha
  • propidium iodide
  • protein tyrosine kinase
  • reactive oxygen species
  • temporary threshold shift
  • tyrosine kinase proteins

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