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  • Title: Influence of pregnancy and the postpartum period on estrogen uptake of the rat fallopian tubes and uterus.
    Author: Roy SK, Roy SK.
    Journal: Fertil Steril; 1977 May; 28(5):587-9. PubMed ID: 852612.
    Abstract:
    After incubation with 6,7-3H-estradiol, the uptake of radioactivity was measured in rat fallopian tubes and uterus during diestrus, estrus, early and late stages of gestation, and the postpartum period (PP). Uptake patterns during early and late pregnancy reflect the critical endogenous estogenic influence on in vitro hormonal (estrogenic) sensitivity of fallopian tubes and uterus. Very low levels of uptake are observed during the middle and late stages of pregnancy, i.e., day 12 to day 20 postcoitum, followed by a sharp increase during the puerperium (days 1 to 6 PP). However, a close similarity exists between tubal and uterine estrogen uptake patterns during the estrous cycle and critical stages of implantation, followed by pregnancy and the postpartum period. The uptake of 6,7-tritiated-estradiol by the rat Fallopian tubes and uterus was determined in vitro in specimens obtained during diestrus and estrus, the early and late stages of pregnancy, and the postpartum period. Incorporation levels were very low during Days 12-20 of pregnancy, followed by a sharp increase during Days 1-6 of the puerperium. Tubal and uterine uptake of estradiol during the estrous cycle and stages of implantation showed similar patterns.
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