Document Detail

Regulation and localization of insulin-like growth factor binding protein-5 gene expression in the uterus and placenta of the cyclic and early pregnant ewe.
MedLine Citation:
PMID:  10775195     Owner:  NLM     Status:  MEDLINE    
The insulin-like growth factor (IGF) system plays an important role in the regulation of uterine function and placental growth. However, there is little information regarding the localization and regulation of IGF binding protein-5 (IGFBP-5) in the reproductive tract. The distribution of this IGFBP was therefore investigated using in situ hybridization in sections of utero-placental tissue obtained throughout the estrous cycle, up to Day 55 of gestation, and on Days 16-17 from both horns of ewes with unilateral pregnancies that followed uterine transection. In nonpregnant ewes, IGFBP-5 mRNA was present at high concentrations in the maternal caruncles and luminal epithelium, and at moderate levels in myometrium. In these regions IGFBP-5 mRNA showed cyclic variations, with concentrations peaking around ovulation, whereas low expression in the endometrial stroma remained constant. During pregnancy, there was additional localization to the endometrial glands; and in all regions, with the exception of the caruncles, concentrations increased significantly with gestational age. In transected uteri, concentrations in the luminal epithelium of the pregnant horn were significantly higher than those in the nonpregnant horn. In the caruncles, IGFBP-5 mRNA formed an intense band just below the tips of the invading fetal villi. Below this band, IGFBP-5 mRNA localized to form a series of rings, which could create a route to allow the fetal villi access into the caruncular stroma for nutrient exchange. In conclusion, IGFBP-5 is abundantly expressed in the ovine reproductive tract, with both the concentration and localization differentially regulated during the cycle and pregnancy.
T S Gadd; J C Osgerby; D C Wathes
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biology of reproduction     Volume:  62     ISSN:  0006-3363     ISO Abbreviation:  Biol. Reprod.     Publication Date:  2000 May 
Date Detail:
Created Date:  2000-08-07     Completed Date:  2000-08-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0207224     Medline TA:  Biol Reprod     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1415-21     Citation Subset:  IM    
Department of Veterinary Basic Sciences, Royal Veterinary College, Potters Bar, Hertfordshire, EN6 1NB, United Kingdom.
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MeSH Terms
Estrus / physiology*
Gene Expression Regulation
Gestational Age
Insulin-Like Growth Factor Binding Protein 5 / genetics*
Placenta / physiology*
Pregnancy, Animal / genetics*
Uterus / physiology*
Reg. No./Substance:
0/Insulin-Like Growth Factor Binding Protein 5

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

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