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Published on: March 16, 2018

Cisplatin ototoxicity involves cytokines and STAT6 signaling network

Hyung-Jin Kim1, Gi-Su Oh, Jeong-Han Lee

  • 1Vestibulocochlear Research Center & Department of Microbiology, Wonkwang University, Iksan, Jeonbuk 570-749, Korea.

Cell Research
|February 16, 2011
PubMed

Insights

Signal transducer and activator of transcription 6 (STAT6) signaling protects against cisplatin ototoxicity by reducing pro-inflammatory cytokines. STAT6 deficiency exacerbates hearing loss and cochlear damage from cisplatin treatment.

Area of Science:

  • Molecular Biology
  • Immunology
  • Ototoxicity Research

Background:

  • Cisplatin is a widely used chemotherapy agent with known ototoxic side effects.
  • The role of the STAT signaling pathway in cisplatin-induced ototoxicity and inflammation remains incompletely understood.

Purpose of the Study:

  • To investigate the involvement of the STAT signaling cascade in pro-inflammatory cytokine production and cisplatin-induced ototoxicity.
  • To elucidate the specific role of STAT6 in the cellular response to cisplatin.

Main Methods:

  • Utilized wild-type (WT), STAT4(-/-), and STAT6(-/-) mice models to assess hearing impairment and cytokine levels post-cisplatin treatment.
  • Performed organotypic cultures of cochlear tissues to evaluate hair cell integrity.
  • Investigated STAT6 phosphorylation and cellular responses in HEI-OC1 auditory cells treated with cisplatin, including STAT6 knockdown via siRNA.

Main Results:

  • STAT6(-/-) mice showed significantly less hearing impairment and preserved cochlear hair cell structures compared to WT and STAT4(-/-) mice after cisplatin exposure.
  • Pro-inflammatory cytokine levels (TNF-α, IL-1β, IL-6) were elevated in WT and STAT4(-/-) mice but not in STAT6(-/-) mice.
  • Cisplatin induced STAT6 phosphorylation in auditory cells; STAT6 knockdown protected cells from cisplatin-induced death and reduced cytokine production.

Conclusions:

  • STAT6 signaling is crucial in mitigating cisplatin-induced ototoxicity and suppressing pro-inflammatory cytokine production.
  • STAT6 activation, potentially modulated by IL-4 and IL-13, plays a protective role against cisplatin's damaging effects on the auditory system.

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