[Possibilities for the spread of alpha-fetoprotein and heterologous antibodies in mother and fetus during transplacental carcinogenesis].

The study of distribution of J125 labelled homologous alpha-fetoproteins (AFP) and heterologous antibodies (anti-AFP) in rats indicated some differences in the level of radioactivity of organs and tissues in animals, depending on age, especially in kidneys and large intestine. In normal pregnancy AFP passes through the placenta in both directions, but in rather less relative amounts from the fetus to mother. No labelled AFP was found in the amniotic fluid of fetuses 5 hours after its injection to pregnant mice. Anti-ATP injected in normal pregnant mice failed to pass through the placental barrier to the fetus, and radioactivity 5 hours following the injection was detected neither in fetal tissues nor in the amniotic fluid. After transplacental exposure of fetuses to methyl nitrosurea the labelled AFP was found in the amniotic fluid, while anti-AFP-both in fetal tissues and the amniotic fluid.