Abstract
The first in vitro tests for developmental toxicity made use of rodent cells. Newer teratology tests, e.g. developed during the ESNATS project, use human cells and measure mechanistic endpoints (such as transcriptome changes). However, the toxicological implications of mechanistic parameters are hard to judge, without functional/morphological endpoints. To address this issue, we developed a new version of the human stem cell-based test STOP-tox(UKN). For this purpose, the capacity of the cells to self-organize to neural rosettes was assessed as functional endpoint: pluripotent stem cells were allowed to differentiate into neuroepithelial cells for 6 days in the presence or absence of toxicants. Then, both transcriptome changes were measured (standard STOP-tox(UKN)) and cells were allowed to form rosettes. After optimization of staining methods, an imaging algorithm for rosette quantification was implemented and used for an automated rosette formation assay (RoFA). Neural tube toxicants (like valproic acid), which are known to disturb human development at stages when rosette-forming cells are present, were used as positive controls. Established toxicants led to distinctly different tissue organization and differentiation stages. RoFA outcome and transcript changes largely correlated concerning (1) the concentration-dependence, (2) the time dependence, and (3) the set of positive hits identified amongst 24 potential toxicants. Using such comparative data, a prediction model for the RoFA was developed. The comparative analysis was also used to identify gene dysregulations that are particularly predictive for disturbed rosette formation. This ‘RoFA predictor gene set’ may be used for a simplified and less costly setup of the STOP-tox(UKN) assay.
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Abbreviations
- AOP:
-
Adverse outcome pathway
- BMC25:
-
Benchmark concentration leading to 25% decrease compared to control
- BPA:
-
Bisphenol A
- BR:
-
Borderline range
- CNS:
-
Central nervous system
- CsA:
-
Cyclosporin A
- DMSO:
-
Dimethylsulfoxide
- DNT:
-
Developmental neurotoxicity
- FGF:
-
Fibroblast growth factor
- HDACi:
-
Histone deacetylase inhibitor
- IFNbeta:
-
Interferon beta
- KE:
-
Key events
- KNDP:
-
Key neurodevelopmental processes
- mEST:
-
Mouse embryonic stem cell test
- NAM:
-
New approach methods
- NCAM:
-
Neural cell adhesion molecule
- NDD:
-
Neurodevelopmental distance
- NEP:
-
Neuroepithelial precursor
- OECD:
-
Organization for economic co-operation and development
- PCMB:
-
P-chloromercuribenzoic acid
- PMA:
-
Phorbol 12-myristate 13-acetate
- PSC:
-
Pluripotent stem cells
- RA:
-
Retinoic acid
- REACH:
-
Registration, evaluation, authorisation and restriction of chemicals (EC 1907/2006)
- RoFA:
-
Rosette formation assay
- SD:
-
Standard deviation
- STOP-tox(UKN) :
-
Stem cell-based teratogenic omics prediction-UKN toxicity assay (Shinde et al. 2016a), previously named:
- UKN1:
-
University of Konstanz (1) assay (Krug et al. 2013b)
- T:
-
Threshold
- TSA:
-
Trichostatin A
- U(T):
-
Uncertainty of threshold
- VPA:
-
Valproic acid
- Wnta:
-
Wnt activators
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Acknowledgements
This work was supported by the Land BW, the Doerenkamp-Zbinden foundation, the DFG (RTG1331, KoRS-CB) and the Projects from the European Union's Horizon 2020 research and innovation programme EU-ToxRisk (Grant agreement No 681002) and ENDpoiNTs (Grant agreement No 825759). We are grateful to H. Leisner and D. Fischer and the staff of the bioimaging center (BIC) for invaluable experimental support.
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Dreser, N., Madjar, K., Holzer, AK. et al. Development of a neural rosette formation assay (RoFA) to identify neurodevelopmental toxicants and to characterize their transcriptome disturbances. Arch Toxicol 94, 151–171 (2020). https://doi.org/10.1007/s00204-019-02612-5
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DOI: https://doi.org/10.1007/s00204-019-02612-5