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- W2321897363 abstract "The serum of rats at mid-pregnancy contains at least 2 distinct placental lactogen (PL)-like substances tentatively termed placental lactogen-alpha (PL-alpha) and placental lactogen-beta (PL-beta) (Endocrinol Japon 38: 533-540, 1991). We have investigated the secretory patterns of three placental lactogens (PL-alpha, PL-beta and placental lactogen-II) during normal pregnancy and in two prolonged-pregnancy models. Pregnancy was prolonged by the introduction of new corpora lutea by inducing ovulation on day 15 of pregnancy by successive treatments with PMSG (30 IU/rat, sc on day 12) and hCG (10 IU/rat, iv on day 14), and in the second model by progesterone implants on day 15 of pregnancy. During normal pregnancy, each of the 3 PLs exhibited only one secretory peak in the serum; PL-alpha and PL-beta on day 12 and placental lactogen II (PL-II) on day 20. Interestingly, in the rats with new sets of corpora lutea, serum PL-alpha and PL-beta levels began to increase again on day 18 and showed peaks on day 20 for PL-alpha and on day 22 for PL-beta. In this model, the initiation of PL-II secretion was not affected, but high levels were maintained until day 26, when parturition occurred. In rats receiving either PMSG or hCG, the secretory patterns of the PLs were similar to as those during normal pregnancy.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2321897363 date "1991-01-01" @default.
- W2321897363 modified "2023-10-03" @default.
- W2321897363 title "Placental Lactogen Secretion during Prolonged-Pregnancy in the Rat: The Ovary Plays a Pivotal Role in the Control of Placental Function." @default.
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- W2321897363 doi "https://doi.org/10.1507/endocrj1954.38.541" @default.
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