Erythrocyte insulin binding in preterm newborn infants

Area of Science:

• Endocrinology
• Neonatology
• Cell Biology

Background:

• Insulin resistance is a concern in preterm infants.
• Erythrocyte insulin receptors offer a model for studying insulin binding in neonates.

Purpose of the Study:

• To characterize erythrocyte insulin receptor binding in preterm and term newborn infants.
• To investigate the influence of gestational and postnatal age on insulin receptor characteristics.

Main Methods:

• Studied 125I-insulin binding to erythrocytes from 42 preterm and 32 term infants.
• Analyzed binding at different postnatal ages (birth, 2-7 days, 8-16 days).
• Correlated binding with gestational and postnatal age, and plasma insulin/C-peptide.

Main Results:

• Preterm infants at birth had significantly higher insulin binding than term infants.
• Binding decreased with increasing gestational and postnatal age.
• Enhanced binding in preterm infants was due to increased receptor concentration and affinity.
• Receptor concentration correlated with postnatal age; affinity correlated with gestational age.

Conclusions:

• Erythrocyte insulin receptor characteristics differ between preterm and term newborns.
• Gestational and postnatal age significantly influence insulin receptor binding in infants.
• Findings suggest potential early alterations in insulin sensitivity in preterm infants.