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Summary
Maternal and fetal non-suppressible insulin-like activity (NSILA) levels are higher during pregnancy but decrease at birth. Newborn NSILA correlates with gestational age and birth weight, indicating complex multifactorial control.
Area of Science:
- Endocrinology
- Reproductive Biology
- Neonatology
Background:
- Non-suppressible insulin-like activity (NSILA) is a somatomedin crucial for growth.
- Maternal and fetal NSILA dynamics during pregnancy and parturition are not fully understood.
Purpose of the Study:
- To measure circulating NSILA levels throughout pregnancy, at parturition, and in fetal and newborn sera.
- To investigate the correlation of NSILA with gestational age, birth weight, and other hormones.
Main Methods:
- Competitive protein binding assay for NSILA measurement.
- Analysis of maternal, cord, and newborn sera.
- Correlation analysis with gestational age, birth weight, growth hormone (GH), and cortisol.
Main Results:
- Maternal NSILA levels were significantly higher during pregnancy than in non-pregnant controls.
- Cord NSILA levels were significantly lower than maternal levels at parturition.
- Newborn NSILA levels were lower in premature and small-for-gestational-age infants compared to term newborns.
- Newborn NSILA showed a positive correlation with gestational age and birth weight.
Conclusions:
- Maternal and fetal NSILA levels exhibit distinct patterns during pregnancy and at birth.
- Fetal and newborn NSILA levels are influenced by gestational age and birth weight.
- The maternal-fetal growth-promoting system involving NSILA is complex and multifactorially regulated.