Related Experiment Videos
Teratogenic effects of selenium compounds on cultured postimplantation rat embryos
Insights
Rat embryos are susceptible to selenium (Se) teratogenicity. Different selenium compounds cause embryolethality and malformations, with varying potency compared to other species.
Area of Science:
- Developmental Toxicology
- Environmental Health
- Teratology
Background:
- Selenium (Se) is an essential trace element with a narrow window between nutritional requirement and toxicity.
- Teratogenicity of selenium compounds has been observed in various animal models, but species-specific susceptibility is not fully understood.
Purpose of the Study:
- To investigate the susceptibility of early postimplantation rat embryos to selenium teratogenicity.
- To compare the embryotoxic effects and teratogenic potential of different selenium compounds in an in vitro rat embryo culture system.
Main Methods:
- Postimplantation rat embryos (day 9.5 gestation) were cultured using the roller bottle method for 48 hours.
- Embryos were exposed to various selenium compounds: sodium selenite, sodium selenate, seleno-DL-methionine, and seleno-DL-cystine.
- Embryolethality and morphological abnormalities were assessed.
Main Results:
- Sodium selenite, sodium selenate, seleno-DL-methionine, and seleno-DL-cystine induced embryolethality at 20, 300, 1,000, and 1,000 microM Se, respectively.
- Viable embryos exposed to these compounds exhibited abnormalities, including deformed optic vesicles and swollen rhombencephalon.
- The potency ranking of Se compounds for embryotoxicity differed between rat and bird embryos.
Conclusions:
- Rat embryos demonstrate significant susceptibility to selenium teratogenicity during early postimplantation development.
- The in vitro rat embryo culture system is a valuable tool for assessing the teratogenic potential of environmental agents like selenium.
- Species-specific differences in selenium teratogenicity warrant further investigation.
Abstract:
Embryonic susceptibility to selenium (Se) teratogenicity was examined in rats using postimplantation embryo culture. Rat embryos at day 9.5 of gestation were cultured by the roller bottle method for 48 hr in the presence of Se compounds. Sodium selenite, sodium selenate, seleno-DL-methionine, and seleno-DL-cystine were embryolethal at 20, 300, 1,000, and 1,000 microM Se, respectively. All of these compounds caused abnormalities such as deformed optic vesicle and swollen rhombencephalon in the viable embryos. These abnormalities were considered to correspond to in vivo malformations caused by Se in hamster fetuses or in bird embryos. These results indicate that rat embryos are susceptible to Se teratogenicity. It seems that there are differences in potency ranking of Se compounds between rat and bird embryos.