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Related Concept Videos

Toxicity Testing in Animals01:23

Toxicity Testing in Animals

204
Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...
204

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Related Experiment Video

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Author Spotlight: High-Throughput Toxicity Screening Using Zebrafish Embryo Startle Response Assay
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Jellyfish model for ototoxicity.

Jacob Seth McAfee1, Chris Benson, Dorothy Spangenberg

  • 1*Departments of Otolaryngology, †Pathology and Anatomy, and ‡Physiological Sciences and Ophthalmology, Eastern Virginia Medical School, Norfolk, Virginia, U.S.A.

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|May 3, 2014
PubMed
Summary
This summary is machine-generated.

Jellyfish ephyrae show promise as a screening model for ototoxicity. Gentamicin exposure caused dose-dependent hair cell loss and impaired jellyfish motility, correlating with observed damage.

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Area of Science:

  • Marine Biology
  • Toxicology
  • Ototoxicity Research

Background:

  • Pharmacologic ototoxicity is a significant clinical concern.
  • Current screening models for ototoxic agents are inefficient.
  • Jellyfish (Aurelia aurita) ephyrae possess identifiable hair cells and exhibit observable behavioral changes.

Purpose of the Study:

  • To evaluate Aurelia aurita ephyrae as a novel screening model for ototoxicity.
  • To assess the impact of gentamicin on ephyra hair cell structure and motility.

Main Methods:

  • Ephyrae were exposed to varying concentrations of gentamicin in artificial seawater.
  • Motility parameters (pulsing, swimming, orientation) were recorded at 0, 24, and 48 hours.
  • Hair cell counts were determined using phalloidin staining and confocal microscopy after formalin fixation.

Main Results:

  • Gentamicin caused a dose-dependent reduction in ephyra pulsing, swimming, and orientation.
  • Significant hair cell loss (32% at 24h, 48% at 48h) was observed with gentamicin exposure.
  • Motility deficits correlated significantly with the extent of hair cell loss.

Conclusions:

  • Aurelia aurita ephyrae serve as a viable model for detecting functional and histological ototoxicity.
  • This ephyra model shows potential for efficient screening of ototoxic compounds.