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Plasma prostaglandin levels during early neonatal life following term and pre-term delivery
Insights
Neonatal plasma prostaglandin levels, including prostaglandin E (PGE) and prostaglandin F (PGF), are higher than adult levels during the first month of life. Prematurity does not appear to cause significant abnormalities in neonatal prostaglandin synthesis or metabolism.
Area of Science:
- Biochemistry
- Neonatal Physiology
- Endocrinology
Background:
- Prostaglandins (PGs) are crucial signaling molecules involved in various physiological processes.
- Elevated prostaglandin levels are observed in neonatal circulation compared to adults.
- Understanding prostaglandin dynamics in neonates is vital for assessing physiological maturity.
Purpose of the Study:
- To quantify prostaglandin E (PGE), prostaglandin F (PGF), and 13,14-dihydro-15-oxo-PGF (PGFM) concentrations in neonatal plasma.
- To compare prostaglandin levels in term and preterm neonates over the first few weeks of life.
- To investigate the impact of prematurity on neonatal prostaglandin synthesis and metabolism.
Main Methods:
- Sensitive and specific radioimmunoassays were employed to measure prostaglandin concentrations.
- Blood samples were collected from neonates at various time points after term and preterm delivery.
- Plasma concentrations of PGE, PGF, and PGFM were analyzed.
Main Results:
- Neonatal prostaglandin levels were significantly higher than adult levels during the first month.
- In term neonates, PGE levels decreased by day six post-delivery, while PGF and PGFM remained stable.
- Prostaglandin levels decreased with age in preterm neonates, with PGE reaching adult ranges by 5-8 weeks.
Conclusions:
- Neonatal prostaglandin levels are markedly elevated compared to adults.
- Prematurity itself does not seem to be linked to major issues in neonatal prostaglandin handling.
- Further research may elucidate the specific roles of prostaglandins in neonatal adaptation.
Abstract:
The concentrations of prostaglandin E (PGE), prostaglandin F (PGF) and 13,14-dihydro-15-oxo-PGF (PGFM) have been measured by sensitive and specific radioimmunoassays in neonatal plasma after term and pre-term delivery. Blood samples were taken in the term delivery group from the umbilical artery at birth and on the sixth post-natal day and after pre-term delivery at 2-4 days, on the sixth day, at 2-4 weeks and at 5-8 weeks after birth. The levels of prostaglandins circulating during the first month of life were far greater than those found in normal adults. In neonates delivered at term the plasma concentration of PGE was significantly lower six days after delivery compared with the concentration at delivery whereas the concentrations of PGF and PGFM were essentially unchanged. Following pre-term delivery prostaglandin concentrations declined with increasing neonatal age although only levels of PGE at 5-8 weeks of age were within the normal range of adult values. Comparison of prostaglandin levels six days after delivery between neonates born at term and pre-term showed no significant differences. These results suggest that prematurity per se is not associated with marked abnormalities in the ability of the neonate to synthesize or metabolize prostaglandins.