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- W2168713056 abstract "In baboons as in humans, the placenta is a source of various peptides, including pregnancy-associated plasma protein-A (PAPP-A). However, our present understanding of the regulation of PAPP-A production is incomplete. We have demonstrated that after fetectomy, the baboon placenta retains steroidogenic capacity and is maintained in utero until delivered spontaneously close to term. We have suggested, therefore, that fetectomy provides a valuable in vivo approach to elucidating the role(s) of the fetus, and of the hormones (e.g., estrogen and progesterone) dependent upon the presence of the fetus, in the regulation of placental steroidogenesis during primate pregnancy. Therefore in the present study we utilized the fetectomy model to evaluate the respective roles of the fetus, estrogen, and progesterone on placental PAPP-A. Estradiol, progesterone, and PAPP-A concentrations were determined by RIA in maternal blood collected under ketamine anesthesia on Days 78-100 (n = 5), Days 102-144 (n = 4), and Days 146-164 (n = 3) of gestation (term = Day 184) in control baboons (Papio anubis) and on Days 110-164 in baboons fetectomized on Day 100 (n = 9). Studies were also conducted in five animals in which placental estrogen was increased by maternal treatment on Days 70-100 with androstenedione and in three animals treated on Days 140-164 with the antiestrogen, ethamoxytriphetol (MER-25; 25 mg/day/kg BW).(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2168713056 date "1994-02-01" @default.
- W2168713056 modified "2023-09-23" @default.
- W2168713056 title "Influence of Fetectomy on Serum Pregnancy-Associated Plasma Protein-A Concentrations in the Baboon1" @default.
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- W2168713056 doi "https://doi.org/10.1095/biolreprod50.2.442" @default.
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