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Related Concept Videos

Teratogenicity01:07

Teratogenicity

The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...

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Looking at Developmental Neurotoxicity Testing from the Perspective of an Invertebrate Embryo.

Gerd Bicker1

  • 1Institute of Physiology and Cell Biology, University of Veterinary Medicine Hannover, Bischofsholer Damm 15/102, 30173 Hannover, Germany.

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Summary

This study introduces a novel locust embryo assay to assess chemical developmental neurotoxicity (DNT). The assay accurately predicts DNT potential by examining pioneer neuron navigation, offering a relevant alternative testing method.

Keywords:
Locusta migratoriaaxonal pathfindingdirected cell migrationembryo culturesemaphorin

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Area of Science:

  • Neuroscience
  • Toxicology
  • Developmental Biology

Background:

  • Developmental neurotoxicity (DNT) disrupts normal brain formation.
  • Alternative testing methods for DNT are advancing, including those using invertebrate models.
  • Precisely timed axonal pathfinding is crucial for nervous system development.

Purpose of the Study:

  • To develop and validate an alternative assay for assessing chemical DNT potential.
  • To investigate the utility of locust embryos for DNT testing.
  • To evaluate the assay's predictability for classifying DNT compounds.

Main Methods:

  • Developed a serum-free culture assay using intact locust embryos.
  • Quantified defects in pioneer neuron navigation after exposure to known DNT compounds.
  • Utilized a systematic approach aligned with alternative testing guidelines.

Main Results:

  • The locust embryo assay demonstrated high predictability in classifying test compounds for DNT.
  • Identified defects in pioneer neuron navigation as a key indicator of DNT.
  • The assay leverages evolutionarily conserved semaphorin-mediated neurite guidance mechanisms.

Conclusions:

  • The locust embryo assay is a viable and predictive alternative method for DNT testing.
  • The assay's reliance on conserved mechanisms supports its relevance for mammalian cortical development.
  • This approach advances the development of non-animal testing strategies for chemical safety assessment.