Purinergic Signalling

, Volume 6, Issue 2, pp 273–281 | Cite as

Adenosine amine congener mitigates noise-induced cochlear injury

  • Srdjan M. Vlajkovic
  • Kyu-Hyun Lee
  • Ann Chi Yan Wong
  • Cindy X. Guo
  • Rita Gupta
  • Gary D. Housley
  • Peter R. Thorne
Original Article

Abstract

Hearing loss from noise exposure is a leading occupational disease, with up to 5% of the population at risk world-wide. Here, we present a novel purine-based pharmacological intervention that can ameliorate noise-induced cochlear injury. Wistar rats were exposed to narrow-band noise (8–12 kHz, 110 dB SPL, 2–24 h) to induce cochlear damage and permanent hearing loss. The selective adenosine A1 receptor agonist, adenosine amine congener (ADAC), was administered intraperitoneally (100 µg/kg/day) at time intervals after noise exposure. Hearing thresholds were assessed using auditory brainstem responses and the hair cell loss was evaluated by quantitative histology. Free radical damage in the organ of Corti was assessed using nitrotyrosine immunohistochemistry. The treatment with ADAC after noise exposure led to a significantly greater recovery of hearing thresholds compared with controls. These results were upheld by increased survival of sensory hair cells and reduced nitrotyrosine immunoreactivity in ADAC-treated cochlea. We propose that ADAC could be a valuable treatment for noise-induced cochlear injury in instances of both acute and extended noise exposures.

Keywords

Adenosine Adenosine receptors Adenosine amine congener Cochlea Hearing Treating hearing loss 

Notes

Acknowledgements

This study was supported by the RNID (UK), Deafness Research Foundation (NZ), and Auckland Medical Research Foundation. We thank Dr Ken Jacobson (NIH, Bethesda) for kind donation of ADAC used in this study.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Srdjan M. Vlajkovic
    • 1
  • Kyu-Hyun Lee
    • 1
  • Ann Chi Yan Wong
    • 1
  • Cindy X. Guo
    • 1
  • Rita Gupta
    • 1
  • Gary D. Housley
    • 1
    • 3
  • Peter R. Thorne
    • 1
    • 2
  1. 1.Department of Physiology, Faculty of Medical and Health SciencesThe University of AucklandAucklandNew Zealand
  2. 2.Discipline of Audiology, Faculty of Medical and Health SciencesThe University of AucklandAucklandNew Zealand
  3. 3.Department of Physiology and Translational Neuroscience Facility, School of Medical SciencesUniversity of New South WalesSydneyAustralia

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