ZeTox – Toxicology Services

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icon-neuro-tox NeuroTox – Neurotoxicity Service

Exposure to some drugs might alter the normal activity of the nervous system, even promoting irreversible damage to nervous tissue. Neurotoxicity is remarkably common and among the most frequent reasons for drug attrition. NeuroTox take advantage of the high similarity between zebrafish and human nervous system structure and function.

Figure 1. Conserved brain structures between zebrafish and humans.

Advantages

Assessment of a wide myriad of behavioral phenotypes such as feeding, seizures, involuntary movement, sleeping, and addiction.

Customizable experimental design.

Evaluation of potential neurotoxicity protective candidates.

Simultaneous assessment of cardiotoxicity and hepatotoxicity through the service ZeGlobalTox.

Method description

High-throughput tracking of zebrafish larvae movements is performed using the automated system DanioVision™ (Noldus IT). Alterations in behaviour are evaluated after applying different stimuli and subsequently associated with specific drug-induced neuronal impact.

Readouts

Determination of behavioural phenotypes at 120 hpf:

  • Locomotor activity
  • Thigmotaxis
  • Altered response to light stimuli
  • Habituation
  • Seizures
  • Neuronal survival. Transgenic line with fluorescent reporter protein is used for these experiments
Figure 2. General motor activity evaluation. Light/Dark locomotion pattern of zebrafish larvae in response to a negative control, to a neurotoxic agent (positive control) and a study compound that doesn’t produce neurotoxic effect on basal locomotor activity.

Figure 3. Convulsive behavior assessment. Maximum velocity and the number of angle turns of the larvae treated with vehicle (negative control), convulsive compound (positive control), and a study molecule that does not produce seizures in response to light flash.

References

  1. Cornet C, Calzolari S, Miñana-Prieto R, Dyballa S, van Doornmalen E, Rutjes H, Savy T, D'Amico D, Terriente J. ZeGlobalTox: An Innovative Approach to Address Organ Drug Toxicity Using Zebrafish. Int J Mol Sci. 2017 Apr 19;18(4):864.
  2. Kokel D, Bryan J, Laggner C, White R, Cheung CY, Mateus R, Healey D, Kim S, Werdich AA, Haggarty SJ, Macrae CA, Shoichet B, Peterson RT. Rapid behavior-based identification of neuroactive small molecules in the zebrafish. Nat Chem Biol. 2010 Mar;6(3):231-237.