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Gastrulating Rat Embryo in a Serum-free Culture Model: Changes of Development Caused by Teratogen 5-Azacytidine

Gastrulating Rat Embryo in a Serum-free Culture Model: Changes of Development Caused by Teratogen... Developmental processes in gastrulating rat embryos were investigated by using an original, serum-free, chemically defined model system. 9.5-day-old rat embryos, without extraembryonic membranes, were cultivated at the air–liquid interface in a serum-free medium, with and without a protein supplement, for 2 weeks. A teratogenic, demethylating agent, 5-azacytidine, was added to serum-free and protein-free culture medium and to serum-free medium supplemented with human transferrin. A single dose of 5-azacytidine impaired the survival, growth and differentiation of embryos in protein-free medium and serum-free medium with transferrin. In contrast, repeated exposure to 5-azacytidine was required to impair growth in serum-supplemented medium. It was concluded that the activity of 5-azacytidine was easier to detect in a simple, chemically defined medium than in a serum-supplemented medium. This serum-free in vitro method could be useful in screening for teratogenic or embryotoxic substances during gastrulation, the most critical stage of mammalian development. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Alternatives to Laboratory Animals SAGE

Gastrulating Rat Embryo in a Serum-free Culture Model: Changes of Development Caused by Teratogen 5-Azacytidine

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References (37)

Publisher
SAGE
Copyright
© 1999 Fund for the Replacement of Animals in Medical Experiments
ISSN
0261-1929
eISSN
2632-3559
DOI
10.1177/026119299902700601
Publisher site
See Article on Publisher Site

Abstract

Developmental processes in gastrulating rat embryos were investigated by using an original, serum-free, chemically defined model system. 9.5-day-old rat embryos, without extraembryonic membranes, were cultivated at the air–liquid interface in a serum-free medium, with and without a protein supplement, for 2 weeks. A teratogenic, demethylating agent, 5-azacytidine, was added to serum-free and protein-free culture medium and to serum-free medium supplemented with human transferrin. A single dose of 5-azacytidine impaired the survival, growth and differentiation of embryos in protein-free medium and serum-free medium with transferrin. In contrast, repeated exposure to 5-azacytidine was required to impair growth in serum-supplemented medium. It was concluded that the activity of 5-azacytidine was easier to detect in a simple, chemically defined medium than in a serum-supplemented medium. This serum-free in vitro method could be useful in screening for teratogenic or embryotoxic substances during gastrulation, the most critical stage of mammalian development.

Journal

Alternatives to Laboratory Animals – SAGE

Published: Nov 1, 1999

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