Document Detail

Interrelationships between oxytocin and eicosanoids in human fetal membranes at term gestation: which role for leukotriene B4?
MedLine Citation:
PMID:  9610426     Owner:  NLM     Status:  MEDLINE    
The existence of a functional paracrine loop between oxytocin and prostaglandin F2-alpha in human placental cells has been demonstrated. The present study was undertaken to investigate further the possible interrelationships between oxytocin and eicosanoids in human intrauterine tissues at term gestation. Therefore, we evaluated the effect of leukotriene B4 (LTB4) on oxytocin (OT) production by explants of fetal membranes and amnion and the effect of oxytocin on the production of LTB4 and prostaglandin E2 (PGE2) by both fetal membranes and amnion. In all cases studied (n = 25), short-term cultures of tissue explants (fetal membranes or amnion) have been carried out. The production of eicosanoids and oxytocin in culture medium was evaluated. Oxytocin measurement was carried out by radioimmunoassay following extraction of the substance with Sep Pak C18 cartridges, PGE2 and LTB4 were measured by radioimmunoassay directly in culture medium. Results show that LTB4 has no significant stimulatory effect on oxytocin production by fetal membranes or amnion tissue. On the other hand, oxytocin stimulates PGE2 release by both fetal membranes and isolated amnion, but has no effect on LTB4 production by these tissues. Taken together, these findings suggest the following conclusions: (1) a paracrine loop between LTB4 and oxytocin is lacking in fetal membranes and amnion at term pregnancy; (2) oxytocin exerts a stimulatory effect on PGE2 release by both fetal membranes and amnion; (3) the interrelationships between oxytocin and the different eicosanoids in the above tissues seem to be highly selective.
C Ticconi; A Mauri; A Zicari; U Angeloni; G Loyola; E Piccione
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Gynecological endocrinology : the official journal of the International Society of Gynecological Endocrinology     Volume:  12     ISSN:  0951-3590     ISO Abbreviation:  Gynecol. Endocrinol.     Publication Date:  1998 Apr 
Date Detail:
Created Date:  1998-07-28     Completed Date:  1998-07-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8807913     Medline TA:  Gynecol Endocrinol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  129-34     Citation Subset:  IM    
Department of Surgery, University of Rome Tor Vergata, Italy.
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MeSH Terms
Amnion / metabolism*
Dinoprostone / metabolism*
Extraembryonic Membranes / metabolism*
Gestational Age
Leukotriene B4 / metabolism*
Oxytocin / metabolism*
Paracrine Communication*
Reg. No./Substance:
363-24-6/Dinoprostone; 50-56-6/Oxytocin; 71160-24-2/Leukotriene B4

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

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