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Strontium 90 in placentas embryos and fetuses of mice evaluated by whole body auto radiography


, : Strontium 90 in placentas embryos and fetuses of mice evaluated by whole body auto radiography. Acta Pharmacologica et Toxicologica 44(1): 22-27

90Sr is a hazardous fission product from nuclear reactions. Its transplacental passage is of particular interest because of the high sensitivity of embryos and fetuses to ionizing radiation. Whole-body autoradiography was used to study the fetal uptake and retention of 90Sr and the embryonic/fetal transfer of this isotope as a function of gestational age. Radioactivity was present in the placenta but not in the fetus 15 min after an i.p. injection of 50 .mu.ci 90Sr-nitrate into a 14 day pregnant mouse. During a 72 h observation period, 90Sr gradually accumulated in the hard fetal tissues. In the soft fetal tissues, accumulation occurred up to 12-24 h. After 72 h, no 90Sr could be detected in the soft tissues. 90Sr crossed the visceral yolk sac placenta during early gestation, the visceral yolk sac and the chorioallantoic placentas during late gestation. Transfer increased considerably at the end of the latter period. There was a marked uptake of 90Sr in all structures of early embryos, whereas the isotope concentrated in the preskeletal and skeletal parts of the fetuses. Intake of 90Sr during early gestation may therefore be more injurious to the offspring than intake during late gestation.

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