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Updated: Jun 21, 2026
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Generation of Neurospheres from Mixed Primary Hippocampal and Cortical Neurons Isolated from E14-E16 Sprague Dawley Rat Embryo
Published on: August 31, 2019
Human neurospheres as three-dimensional cellular systems for developmental neurotoxicity testing.
Michaela Moors1, Thomas Dino Rockel, Josef Abel
1Institut für Umweltmedizinische Forschung gGmbH an der Heinrich Heine-Universität, Toxicology, Düsseldorf, Germany.
Environmental Health Perspectives
|August 6, 2009
Summary
A new 3D human brain cell model effectively screens for developmental neurotoxicity (DNT). This system mimics brain development and shows how chemicals like mercury impact neuronal cells, offering a promising alternative to animal testing.
Area of Science:
- Neuroscience
- Toxicology
- Cell Biology
Background:
- Developmental neurotoxicity (DNT) from environmental chemicals poses significant health risks.
- Current rodent-based testing is resource-intensive and ethically concerning.
- The need for alternative, ethical, and efficient DNT testing strategies is driven by regulations like REACH and the 3Rs principles.
Purpose of the Study:
- To develop a novel three-dimensional (3D) in vitro test system for screening developmental neurotoxicants.
- To utilize human fetal brain cells for a more human-relevant DNT assessment.
Main Methods:
- Established human neural progenitor cells (hNPCs) cultured as neurospheres to model brain development.
- Developed assays to assess proliferation, differentiation, migration, and apoptosis in hNPCs.
- Evaluated the effects of known developmental neurotoxicants (mercury compounds) and oxidative stress on the 3D cell model.
Main Results:
- Human neurospheres accurately recapitulated key brain development processes: proliferation, differentiation, and migration.
- Exposure to methylmercury chloride and mercury chloride significantly impaired neuronal cell migration and reduced neuronal cell numbers.
- The model demonstrated functional apoptosis machinery and susceptibility to oxidative stress-induced cell death.
Conclusions:
- The 3D human neurosphere system effectively mimics fundamental brain development processes in vitro.
- This system is sensitive to the disruptive effects of developmental neurotoxicants.
- Human neurospheres represent a promising and viable alternative for DNT screening, aligning with the 3Rs principles.
