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Developmental neurotoxicity is any toxic effect on the developing nervous system interfering with normal nervous system structure or function before or after birth and can be associated with neurodevelopmental disorders such as autism, attention deficit disorder, mental retardation and cerebral palsy. Currently, developmental neurotoxicity testing relies heavily on neurobehavioral and neuropathological studies in rodent models; however, an existing backlog of chemicals lack appropriate neurotoxicity information due to the low throughput nature and subsequent high cost of in vivo animal testing. Alternative models have been developed to replace rodent models (including non-mammalian models, brain slice culture, and primary and transformed cell models) though limitations to increasing throughput and reproducibility remain. In this review, we focus on the use of human pluripotent stem cells as a cell source for in vitro chemical screening. Pluripotent stem cell-based assays are derived from a virtually unlimited and uniform cell source making studies highly reproducible and relatively low cost compared to rodent models. Moreover, directed differentiation to distinct neural lineages, including neurons and astrocytes, provides isogenic, precise and tunable cell mixtures to mimic in vivo brain composition for high throughput screening. Thus, human pluripotent stem cell-derived neural models are poised to vastly increase throughput and decrease costs for developmental neurotoxicity screening.

Modeling human pregnancy-associated developmental neurotoxicity in vitro using pluripotent stem cell-derived neurons and astrocytes