Document Detail


Maternal nutrient restriction during early to mid gestation alters the relationship between insulin-like growth factor I and bodyweight at term in fetal sheep.
MedLine Citation:
PMID:  11545172     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The present study was designed to determine whether altered placental size, as a consequence of maternal nutrient restriction in sheep between 28 and 77 days gestation, is associated with a modified relationship between fetal weight or dimensions and plasma insulin-like growth factor (IGF) I concentration or abundance of hepatic IGF-I and IGF-II mRNA close to term. Singleton-bearing ewes consumed either 1.2x (controls, n = 19) or 0.5x (nutrient restricted, n = 28) their metabolizable energy (ME) requirements from 28 to 77 days gestation, after which all ewes were fed in order to fully meet their ME requirements for maintenance and pregnancy. Close to term (145 +/- 1 days) plasma IGF-I concentration in cord blood was similar between groups, but only significantly correlated with fetal bodyweight, thoracic circumference, crown-rump length and lean body mass in lambs born to control (r2 0.38, 0.76, 0.33, 0.42; P<0.001), and not to nutrient-restricted (r2 = 0.01, 0.11, 0.01, 0.02) ewes. There were no differences in fetal hepatic expression of IGF-I and IGF-II mRNA between groups close to term. In conclusion, maternal nutrient restriction in early to mid gestation followed by feeding to requirements up to term alters the relationship between fetal IGF-I, bodyweight and length. Increasing maternal nutrition in later gestation after a prolonged period of nutrient restriction may stimulate fetal nutrient supply such that fetal growth is enhanced without an increase in plasma IGF-I. As a result, there is a loss of the relationship between fetal weight and plasma IGF-I concentration observed in fetuses whose mothers are fed adequately throughout gestation.
Authors:
L Heasman; J Brameld; A Mostvn; H Budge; J Dawson; P Buttery; T Stephenson; M E Symonds
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Reproduction, fertility, and development     Volume:  12     ISSN:  1031-3613     ISO Abbreviation:  Reprod. Fertil. Dev.     Publication Date:  2000  
Date Detail:
Created Date:  2001-09-06     Completed Date:  2001-10-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8907465     Medline TA:  Reprod Fertil Dev     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  345-50     Citation Subset:  IM    
Affiliation:
Academic Division of Child Health, School of Human Development, University Hospital, Queen's Medical Centre, Nottingham, UK.
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MeSH Terms
Descriptor/Qualifier:
Animals
Birth Weight / physiology*
Female
Fetal Blood / metabolism
Food Deprivation
Gestational Age
Insulin-Like Growth Factor I / genetics,  metabolism*
Insulin-Like Growth Factor II / genetics,  metabolism
Maternal-Fetal Exchange
Organ Size
Placenta / anatomy & histology
Pregnancy
RNA, Messenger / genetics,  metabolism
Sheep
Chemical
Reg. No./Substance:
0/RNA, Messenger; 67763-96-6/Insulin-Like Growth Factor I; 67763-97-7/Insulin-Like Growth Factor II

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


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