Embryonic survival in mice treated with AET, MEA or 5-HT on the first day of pregnancy.

The embryotoxicity of AET, MEA, and 5-HT was investigated in Porton mice. Female mice on the first day of gestation were injected intraperitoneally with 2-amino-ethylisothiouronium bromide hydrobromide (AET), cysteamine hydrochloride (MEA) or serotonin-creatinine sulphate (5-HT) in a dose of 40 mg/kg body weight. Uterine contents were examined on the nineteenth day of pregnancy. As compared with controls, in mice treated with AET, MEA or 5-HT, a smaller number of live fetuses and a greater number of non-implanted embryos, resorptions, and dead fetuses were found. Not all females which were injected with these compounds had live fetuses. Among the compounds, MEA appeared to be more toxic than AET and 5-HT.