Current status of human pluripotent stem cell based in vitro toxicity tests

Area of Science:

• Toxicology
• Stem Cell Biology
• Biomarker Discovery

Background:

• In vitro toxicity testing is crucial for assessing chemical safety.
• Human pluripotent stem cells (hPSCs) offer a promising model for human-relevant toxicity assessment.
• Current hPSC-derived test systems are largely in development, facing reproducibility and standardization challenges.

Purpose of the Study:

• To review the current status of in vitro toxicity tests using hPSC-derived cells.
• To identify challenges and limitations in developing and validating these test systems.
• To explore the potential of emerging technologies to enhance predictive toxicology.

Main Methods:

• Systematic review of existing literature on hPSC-derived in vitro toxicity assays.
• Analysis of differentiation protocols, cell maturation, and readout selection.
• Evaluation of challenges in developmental toxicity and the role of omics technologies.

Main Results:

• Most evaluated hPSC-derived test systems are in early development stages.
• Variability in differentiation success, reproducibility, and cell maturation status is a significant issue.
• Standardization of cellular models and selection of appropriate toxicological endpoints remain challenging.
• Limited knowledge of predictive biomarkers hinders developmental toxicity assessment.

Conclusions:

• hPSC-derived in vitro models show potential but require significant development and harmonization for reliable toxicological applications.
• Addressing challenges in cell maturation, reproducibility, and endpoint selection is critical.
• 'Omics' technologies hold promise for improving the accuracy and predictability of human in vitro toxicity testing.