Related Experiment Video
Updated: Feb 16, 2026
Human Pluripotent Stem Cell Based Developmental Toxicity Assays for Chemical Safety Screening and Systems Biology Data Generation
Published on: June 17, 2015
Characterization of 3D embryonic C57BL/6 and A/J mouse midbrain micromass in vitro culture systems for developmental
Julie Juyoung Park1, Brittany A Weldon1, Sungwoo Hong1
1Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA; Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA.
Abstract:
In vitro micromass culture systems have been proposed as an alternative method for developmental toxicity assessment to reduce the need for resource-intensive in vivo toxicity testing. In this study, a three-dimensional in vitro embryonic mouse midbrain culture system is characterized in two mouse strains to facilitate gene x environment considerations. Gestational day (GD) 11 C57BL/6 or GD 12 A/J mouse midbrain cells were isolated and cultured in high-density micromass format for 22days in vitro (DIV). Hematoxylin intensity and protein content revealed that neuronal differentiation increases linearly over time in both C57BL/6 and A/J cultures. Protein expression showed time-dependent proliferation markers (PCNA) increased significantly between DIV 4-6 compared to DIV 1. Early and late differentiation markers (e.g. β-tubulin III and NMDAɛ1) were expressed between DIV 6-8 and DIV 8-15, respectively. Immunohistochemistry and protein expression results for proliferation and differentiation markers were concordant. Protein expression patterns for the two mouse strain micromass systems were similar. This study characterizes a novel method for investigating early neurogenesis and may be used to characterize neurodevelopmental toxicity in vitro. Our findings show how the use of different mouse strains in neurodevelopmental studies may extend test systems for gene and environment interaction studies.
Insights
This study developed a novel in vitro mouse midbrain culture system for assessing neurodevelopmental toxicity. The method effectively models neuronal differentiation and can be used for gene x environment interaction studies.
Area of Science:
- Neuroscience
- Developmental Biology
- Toxicology
Background:
- In vitro micromass cultures offer an alternative to animal testing for developmental toxicity.
- Characterizing novel in vitro systems is crucial for advancing toxicological assessments.
Purpose of the Study:
- To characterize a 3D in vitro embryonic mouse midbrain culture system using two mouse strains.
- To evaluate the system's utility for studying gene x environment interactions in neurodevelopmental toxicity.
Main Methods:
- Isolation and culture of embryonic mouse midbrain cells (C57BL/6 and A/J strains) in micromass format.
- Analysis of neuronal differentiation markers (hematoxylin intensity, protein content, β-tubulin III, NMDAɛ1) over 22 days in vitro (DIV).
- Assessment of proliferation markers (PCNA) and immunohistochemistry for validation.
Main Results:
- Neuronal differentiation increased linearly over time in both mouse strains.
- Proliferation markers peaked between DIV 4-6, while differentiation markers appeared between DIV 6-15.
- Protein expression patterns were consistent between the two mouse strains, indicating system reliability.
Conclusions:
- The characterized in vitro midbrain micromass culture system reliably models early neurogenesis.
- This novel method can be applied to assess in vitro neurodevelopmental toxicity.
- Utilizing different mouse strains enhances the system's potential for gene x environment interaction studies.
More Related Videos
07:41Author Spotlight: Establishing Mixed Neuronal and Glial Cell Cultures from Embryonic Mouse Brains to Study Infection and Innate Immunity
Published on: June 30, 2023
07:33Organotypic Slice Cultures of Embryonic Ventral Midbrain: A System to Study Dopaminergic Neuronal Development in vitro
Published on: January 31, 2012