Apoptosis

, Volume 18, Issue 4, pp 393–408

Profiling drug-induced cell death pathways in the zebrafish lateral line

  • Allison B. Coffin
  • Kay L. Williamson
  • Anna Mamiya
  • David W. Raible
  • Edwin W. Rubel
Original Paper

DOI: 10.1007/s10495-013-0816-8

Cite this article as:
Coffin, A.B., Williamson, K.L., Mamiya, A. et al. Apoptosis (2013) 18: 393. doi:10.1007/s10495-013-0816-8

Abstract

Programmed cell death (PCD) is an important process in development and disease, as it allows the body to rid itself of unwanted or damaged cells. However, PCD pathways can also be activated in otherwise healthy cells. One such case occurs in sensory hair cells of the inner ear following exposure to ototoxic drugs, resulting in hearing loss and/or balance disorders. The intracellular pathways that determine if hair cells die or survive following this or other ototoxic challenges are incompletely understood. We use the larval zebrafish lateral line, an external hair cell-bearing sensory system, as a platform for profiling cell death pathways activated in response to ototoxic stimuli. In this report the importance of each pathway was assessed by screening a custom cell death inhibitor library for instances when pathway inhibition protected hair cells from the aminoglycosides neomycin or gentamicin, or the chemotherapy agent cisplatin. This screen revealed that each ototoxin likely activated a distinct subset of possible cell death pathways. For example, the proteasome inhibitor Z-LLF-CHO protected hair cells from either aminoglycoside or from cisplatin, while d-methionine, an antioxidant, protected hair cells from gentamicin or cisplatin but not from neomycin toxicity. The calpain inhibitor leupeptin primarily protected hair cells from neomycin, as did a Bax channel blocker. Neither caspase inhibition nor protein synthesis inhibition altered the progression of hair cell death. Taken together, these results suggest that ototoxin-treated hair cells die via multiple processes that form an interactive network of cell death signaling cascades.

Keywords

Hair cellOtotoxicityNeomycinGentamicinCisplatin

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Allison B. Coffin
    • 1
    • 2
    • 5
  • Kay L. Williamson
    • 1
    • 2
    • 5
  • Anna Mamiya
    • 3
  • David W. Raible
    • 1
    • 4
  • Edwin W. Rubel
    • 1
    • 2
  1. 1.Virginia Merrill Bloedel Hearing Research CenterUniversity of WashingtonSeattleUSA
  2. 2.Department of Otolaryngology–Head and Neck SurgeryUniversity of WashingtonSeattleUSA
  3. 3.Department of Speech and Hearing ScienceUniversity of WashingtonSeattleUSA
  4. 4.Department of Biological StructureUniversity of WashingtonSeattleUSA
  5. 5.Department of Veterinary and Comparative Anatomy, Pharmacology, and PhysiologyCollege of Arts and Sciences, Washington State UniversityVancouverUSA