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The present study was carried out to establish a mouse whole embryo culture technique for detecting developmental toxicity in ICR mice. ICR mouse embryos were explanted on gestational day (GD) 8.5 and cultured for 48 hrs in the bottles containing 2 ㎖ of culture media consisting of 100% immediately centrifuged and heat-inactivated rat serum. The culture bottles with 15 ㎖ capacity were attached to a rotator drum and rotated at 35 rpm, 37.5℃ with a continuous gas flow of 5% O₂, 5% CO₂, 90% N₂ for the first 17 hrs; 20% O₂, 5% CO₂, 75% N₂ for the next 17 hrs; 40% O₂, 5% CO₂, 55% N₂ for the last 24 hrs, After 48 hrs of culture, the growth and differentiation of embryos were compared with those of embryos grown in vivo and each embryo was evaluated for the presence of any malformations. At the begining of the culture, embryos were early somite stage, and the length of whole conceptus including ectoplacental corn was about 1.8 ㎜. At the end of culture, all embryos in culture showed well-developed vascularization in the body and yolk sac. No morphological and histological defects were detected in any embryos examined. The yolk sac diameter, crown-rump length, and head length were 5.1, 4.3, and 2.3 ㎜, respectively. The number of somite pairs and morphological score were 30.0 and 67.7, respectively. The crown-rump length, head length and somite number of embryos grown for 48 hrs in vitro were slightly lower than those of embryos in vivo, respectively, but the morphology and differentiation were similar to those of embryos in vivo. These results indicated that morphology, growth and differentiation of in vitro mouse embryos are almost identical to those of in vivo embryos and suggest that the mouse whole embryo culture technique can be a useful tool for prescreening the developmental toxicity of chemicals.

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UCI(KEPA) : I410-ECN-0101-2009-510-016364423