Document Detail

Prolactin synthesis and release during pregnancy and puerperium.
MedLine Citation:
PMID:  6766668     Owner:  NLM     Status:  MEDLINE    
Prolactin (PRL) synthesis and its release following thyrotropin-releasing hormone (TRH) administration during pregnancy and puerperium was studied in 45 women. Mean baseline E2 increased from 1,900 +/- 384 (SEM) pg/ml in the first trimester to 3,520 +/- 849 in the second trimester (P less than 0.05) and 43,057 +/- 5,765 pg/ml in the third trimester (P less than 0.001) of pregnancy. Mean baseline progesterone increased from 27.6 +/- 3.2 ng/ml in the first trimester to 41.9 +/- 6.6 in the second trimester (P less than 0.01) and 109.3 +/- 11.2 ng/ml in the third trimester (P less than 0.001) of pregnancy. Ten days after delivery, mean E2 dropped to 13 +/- 2.9 pg/ml and progesterone dropped to 0.56 +/- 0.07 ng/ml in the lactating women; in the nonlactating women, mean E2 level was 100 +/- 44 pg/ml and mean progesterone was 0.63 +/- 0.09 ng/ml. Baseline PRL increased from 27 +/- 15 ng/ml in the third trimester (P less than 0.002). The increased synthesis of PRL with increasing gestation was thought to be due to the stimulatory effects of E2 and progesterone, resulting in hyperplasia of the lactotrophs. In response to TRH, PRL demonstrated a significant increase from the first trimester to the second, with no further increase in the third. Therefore, it appears that the PRL reserve increases only during the first and second trimesters of pregnancy. Ten days after delivery, baseline PRL in response to TRH decreased to levels found in the first and second trimesters. However, the lactating women released less PRL than the nonlactating subjects (P less than 0.01), since PRL is released with each lactating episode which in turn probably reduces the PRL reserve.
O A Kletzky; R P Marrs; W F Howard; W McCormick; D R Mishell
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American journal of obstetrics and gynecology     Volume:  136     ISSN:  0002-9378     ISO Abbreviation:  Am. J. Obstet. Gynecol.     Publication Date:  1980 Feb 
Date Detail:
Created Date:  1980-04-17     Completed Date:  1980-04-17     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  0370476     Medline TA:  Am J Obstet Gynecol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  545-50     Citation Subset:  AIM; IM    
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MeSH Terms
Estradiol / blood
Follicular Phase
Postpartum Period*
Progesterone / blood
Prolactin / biosynthesis*,  blood
Thyrotropin-Releasing Hormone / diagnostic use
Reg. No./Substance:
24305-27-9/Thyrotropin-Releasing Hormone; 50-28-2/Estradiol; 57-83-0/Progesterone; 9002-62-4/Prolactin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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