Primary cell and micromass culture in assessing developmental toxicity

Area of Science:

• Toxicology
• Developmental Biology
• In Vitro Assays

Background:

• European Commission's New Chemical Policy mandates reproductive/developmental toxicity testing for chemicals.
• Extensive chemical testing necessitates a large number of laboratory animals.
• In vitro systems offer potential to reduce animal use, refine procedures, and lower industry costs.

Purpose of the Study:

• To describe and compare primary embryonic cell culture, specifically micromass (MM) culture, with validated in vitro systems.
• To evaluate the utility of a novel chick heart micromass (MM) culture system.
• To compare these methods against the validated D3 mouse embryonic stem cell (ESC) test for developmental toxicity.

Main Methods:

• Utilized primary embryonic cell culture, focusing on micromass (MM) culture.
• Employed a novel chick heart micromass (MM) culture system.
• Compared results with the validated D3 mouse embryonic stem cell (ESC) test.

Main Results:

• Validated in vitro systems for developmental toxicity/embryotoxicity testing exist.
• Three assays have been validated: whole embryo culture (WEC), rat limb bud micromass (MM), and embryonic stem cell test (EST).
• The study describes and compares micromass culture, including chick heart micromass, to the D3 mouse ESC test.

Conclusions:

• In vitro systems are valuable tools for reducing animal use in chemical toxicity testing.
• Micromass culture, including novel chick heart models, shows potential as an alternative or pre-screening tool.
• Further comparison with validated assays like the ESC test is crucial for refining developmental toxicity testing strategies.