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Fetal leptin and insulin levels only correlate inlarge-for-gestational age infants

H J Wolf1, C F Ebenbichler, O Huter

  • 1Department of Obstetrics and Gynaecology, University of Innsbruck, Austria. hans.wolf@uibk.ac.at

European Journal of Endocrinology
|May 24, 2000
PubMed

Insights

Fetal leptin levels correlate with birth weight, particularly in large-for-gestational age neonates, and this relationship is mediated by insulin, suggesting fetal insulin stimulates leptin production.

Area of Science:

  • Perinatal Medicine
  • Endocrinology
  • Neonatal Research

Background:

  • Fetal growth is influenced by various hormones.
  • Leptin, a key metabolic regulator, plays a role in fetal development.

Purpose of the Study:

  • To investigate the correlation between fetal leptin levels and fetal weight.
  • To determine if this correlation is direct or indirect, mediated by insulin or human placental lactogen (hPL).

Main Methods:

  • A cross-sectional study of 175 neonates, including large-for-gestational age (LGA) and small-for-gestational age (SGA) cases.
  • Fetal cord blood was analyzed for leptin, insulin, and hPL levels using radioimmunoassay (RIA).
  • Anthropometric data, including birth weight, were recorded.

Main Results:

  • Fetal leptin levels positively correlated with anthropometric data, especially in female neonates.
  • Leptin levels were significantly higher in LGA neonates compared to appropriate-for-gestational age (AGA) and SGA neonates.
  • Fetal leptin strongly correlated with fetal insulin, and this relationship mediated the prediction of birth weight by insulin.

Conclusions:

  • Fetal leptin levels are associated with fetal weight, particularly in LGA neonates.
  • The correlation between fetal insulin and neonatal weight in LGA infants appears to be indirectly mediated by leptin.
  • It is hypothesized that fetal insulin stimulates leptin production by fetal adipocytes.
Abstract

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