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[Morphological studies of vitelline epithelium in the rat after hormonal disorders].


 The effects of hormonal disturbances during pregnancy on the vitelline epithelium were studied in 80 Sprague-Dawley rats. Alloxan diabetes, puromycin, ovarian contusion, tubal ligation, estradiol, lynestrenol, mestrenol, or progesterone were administered in Week 2 or 3 of gestation; placental tissue was collected on Day 21. After staining with hematoxylin-phosphorus-tungstate, the vitelline epithelium of untreated and progesterone-treated rats showed a blue granulation. This was scarcely visible in alloxan diabetic rats or in puromycin-treated rats, and pronounced vacuole formation was observed in these animals. Ovarian contusion or tubal ligation resulted in a cloudy precipitate in the cells; the granulation could not be found. After treatment with estradiol benzoate, or with lynestrol and mestrenol, the cells of the vitelline membrane were almost free of granules; enlarged, cloudy cells with wrinkled nuclei were visible in the mesometral region. Further chemical and functional studies are needed to elucidate these findings.
