Elevated umbilical cord ghrelin concentrations in small for gestational age neonates

Area of Science:

• Neonatal physiology
• Endocrinology
• Fetal development

Background:

• Ghrelin, a hormone with orexigenic effects, is present in umbilical cord plasma.
• Its presence suggests a potential role in fetal and neonatal energy homeostasis.
• Understanding ghrelin's role is crucial for managing neonatal growth and metabolic health.

Purpose of the Study:

• To measure ghrelin levels in neonates of varying birth weights (small, appropriate, and large for gestational age).
• To investigate the relationship between ghrelin concentrations and neonatal insulin and glucose levels.
• To explore the influence of maternal diabetes and other factors on fetal ghrelin production.

Main Methods:

• Plasma concentrations of ghrelin, insulin, and glucose were measured in cord blood at birth.
• The study included 123 neonates across a range of gestational ages (24-41 weeks).
• Infants were categorized as small (SGA), appropriate (AGA), or large (LGA) for gestational age, with consideration for maternal diabetes status.

Main Results:

• Ghrelin was detected in all neonates studied.
• SGA neonates exhibited significantly higher ghrelin concentrations (40% increase) compared to AGA and LGA neonates.
• Ghrelin levels showed varying correlations with gestational age in SGA versus AGA/LGA groups, with birth weight z-score and maternal factors being significant determinants.

Conclusions:

• SGA neonates demonstrate elevated umbilical cord plasma ghrelin concentrations.
• Ghrelin may play a crucial physiological role in fetal adaptation to intrauterine malnutrition.
• Further research into ghrelin's function can inform strategies for neonatal nutritional support and metabolic monitoring.