title: [Study on the relationships between leptin levels and weights of mothers and infants and the relationships of cord serum leptin to C-peptide, insulin and insulin like growth factor-II].
abstract: OBJECTIVE
  To determine the relationships between serum leptin levels and maternal weights in late pregnancy and cord blood leptin levels to birth-weights, C-peptide, insulin and insulin like growth factor (IGF-II).
  
  
  METHODS
  Fifty normal pregnant women at 37-38 weeks and their newborns were studied, and 29 non-pregnant women were set as control. Venous blood was taken from women and from the cord at delivery. Blood leptin and cord blood C-peptide, insulin, and IGF-II were measured by radio-immunoassay.
  
  
  RESULTS
  The average leptin level in maternal sera was (13.62 +/- 3.68) micrograms/L, significantly higher than that in the control (6.60 +/- 3.04) micrograms/L and that in cord blood (8.05 +/- 4.61) micrograms/L. Maternal leptin levels were significantly correlated with maternal weights and body mass index (BMI. r = 0.33, 0.35, P < 0.05), but not with infant birth-weights (r = 0.10, P > 0.05). Cord blood leptin levels were significantly correlated with birth-weights and BMI (r = 0.54, 0.49, P < 0.001) but have no correlation with maternal leptin levels (r = 0.19, P > 0.05). Significant difference of the cord leptin levels was not seen between the males and females. The cord blood C-peptide was (0.86 +/- 0.35) microgram/L, insulin (8.49 +/- 4.76) mU/L and IGF-II (0.218 +/- 0.076) microgram/T. Cord leptin levels were correlated with C-peptide levels (r = 0.37, P < 0.05), but not with insulin and IGF-II levels (r = 0.19, -0.14, P > 0.05).
  
  
  CONCLUSIONS
  Maternal leptin levels in late pregnancy were significantly higher than those in normal non-pregnant women and positively correlated with maternal weights and BMI. Cord blood leptin levels were positively correlated with birth-weights and BMI of the newborns. The leptin levels of cord blood were correlated with those of C-peptide but not insulin and IGF-II.
authors.affiliation: General Hospital of the People's Liberation Army, Beijing 100853, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Lu
authors.forename: X
authors.initials: X
authors.lastname: Hao
authors.forename: X
authors.initials: X
authors.lastname: Weng
mesh_terms: D000328:Adult; D001724:Birth Weight; D001835:Body Weight; D002096:C-Peptide / Q000097:blood*; D005260:Female; D005312:Fetal Blood / Q000737:chemistry*; D006801:Humans; D007231:Infant, Newborn; D007328:Insulin / Q000097:blood*; D007335:Insulin-Like Growth Factor II / Q000032:analysis*; D020738:Leptin / Q000097:blood*; D011247:Pregnancy
chemical_list: D002096:C-Peptide; D007328:Insulin; D020738:Leptin; D007335:Insulin-Like Growth Factor II