title: A positive umbilical venous-arterial difference of leptin level and its rapid decline after birth.
abstract: OBJECTIVE
  We investigated the site of leptin production in the fetoplacental circulation.
  
  
  METHODS
  We simultaneously determined plasma leptin levels in cord vessels and maternal peripheral veins of 38 healthy pregnant women. We also compared plasma leptin levels in 20 neonates at birth and on the fifth day after birth.
  
  
  RESULTS
  Leptin levels in cord vessels were significantly (p < 0.001) lower than those in maternal veins (mean 29.5 ng/ml). Leptin levels in umbilical arteries (mean 9.8 ng/ml) were significantly (p < 0.01) lower than those in umbilical veins (mean 12.9 ng/ml). Leptin levels in neonatal veins on the fifth day (mean 3.0 ng/ml) were markedly (p < 0.001) lower than those in umbilical arteries of the same neonates (mean 10.9 ng/ml).
  
  
  CONCLUSIONS
  The higher leptin levels in umbilical veins than in umbilical arteries and the marked decrease during the neonatal period suggest that the placenta is one of the major sources of leptin in the fetal circulation.
authors.affiliation: Department of Gynecology and Obstetrics, Kyoto University Graduate School of Medicine, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yura
authors.forename: N
authors.initials: N
authors.lastname: Sagawa
authors.forename: H
authors.initials: H
authors.lastname: Mise
authors.forename: T
authors.initials: T
authors.lastname: Mori
authors.forename: H
authors.initials: H
authors.lastname: Masuzaki
authors.forename: Y
authors.initials: Y
authors.lastname: Ogawa
authors.forename: K
authors.initials: K
authors.lastname: Nakao
mesh_terms: D000328:Adult; D000375:Aging; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D020738:Leptin; D008297:Male; D011247:Pregnancy; D011506:Proteins / Q000032:analysis* / Q000378:metabolism; D012016:Reference Values; D012727:Sex Characteristics; D014469:Umbilical Arteries; D014471:Umbilical Veins
chemical_list: D020738:Leptin; D011506:Proteins