scholarly journals Dietary protein during gestation affects maternal insulin-like growth factor, insulin-like growth factor binding protein, leptin concentrations, and fetal growth in heifers

2009 ◽  
Vol 87 (10) ◽  
pp. 3304-3316 ◽  
Author(s):  
T. M. Sullivan ◽  
G. C. Micke ◽  
N. Perkins ◽  
G. B. Martin ◽  
C. R. Wallace ◽  
...  
Keyword(s):  
Growth Factor ◽  
Fetal Growth ◽  
Dietary Protein ◽  
Binding Protein ◽  
Insulin Like Growth Factor ◽  
Factor Binding

The concentration of insulin-like growth factor-I and insulin-like growth factor-binding protein-1 in human umbilical cord serum at delivery: relation to fetal weight

1991 ◽  
Vol 129 (3) ◽  
pp. 459-464 ◽  
Author(s):  
H. S. Wang ◽  
J. Lim ◽  
J. English ◽  
L. Irvine ◽  
T. Chard
Keyword(s):  
Growth Factor ◽  
Umbilical Cord ◽  
Fetal Growth ◽  
Gestational Age ◽  
Umbilical Artery ◽  
Binding Protein ◽  
Insulin Like Growth Factor ◽  
Factor Binding ◽  
Factor I ◽  
Igf I

ABSTRACT Serum levels of insulin-like growth factor-I (IGF-I) and insulin-like growth factor-binding protein-1 (IGFBP-1) have been determined by radioimmunoassay in the maternal circulation (n = 91) and in the umbilical artery (n = 56) and vein (n = 90) of man. In both the umbilical artery and vein, the concentration of serum IGF-I showed an inverse correlation with birthweight (P < 0·005 and P < 0·001 respectively); the mean serum IGF-I levels in the small-for-gestational-age (SGA) group were significantly higher than those in average-for-gestational-age (AGA) neonates (P <0·01 and P < 0·001 respectively). However, maternal serum IGF-I showed no association with birthweight and there was no significant difference between the SGA and AGA groups. These observations imply that the production of IGF-I in the maternal and fetal compartments is independent and that there is unlikely to be transfer of IGF-I across the placenta. Serum IGFBP-1 levels in both maternal and umbilical cord blood (artery and vein) showed an inverse relation to birthweight (P <0·001, P<0·005 and P<0·001 respectively). Increased IGFBP-1 levels in the umbilical artery and vein were observed in the SGA group. These findings suggest that IGFBP-1 might inhibit the action of IGF-I in both the maternal and the fetal compartments and that the rise in IGFBP-1 could be a primary factor in retardation of fetal growth. Alternatively, circulating IGF-I and IGFBP-1 levels may only be a secondary reflection of local tissue events involved in fetal growth. Journal of Endocrinology (1991) 129, 459–464

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