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Circulating interleukin-1 receptor antagonist levels in neonates
R Geiger1, H Ellemunter, F M Fink
1Innsbruck University Hospital, Department of Paediatrics, Austria.
European Journal of Pediatrics
|September 1, 1996
Summary
Interleukin-1 receptor antagonist (IL-1 Ra) levels are naturally high in newborns during the first few days of life, then decrease. Critically ill neonates show significantly elevated IL-1 Ra levels compared to healthy infants.
Area of Science:
- Neonatology
- Immunology
- Biochemistry
Background:
- Circulating interleukin-1 receptor antagonist (IL-1 Ra) levels are established biomarkers for disease activity in adults.
- Understanding IL-1 Ra dynamics in neonates is crucial for assessing inflammatory states.
Purpose of the Study:
- To establish reference values for circulating IL-1 Ra in healthy neonates.
- To compare IL-1 Ra levels in healthy neonates with those experiencing severe illness.
Main Methods:
- Measurement of circulating IL-1 Ra levels in healthy preterm and term infants on days 2 and 4 of life.
- Comparison of IL-1 Ra levels between healthy neonates and neonates with severe conditions (septicemia, asphyxia, respiratory distress syndrome).
Main Results:
- IL-1 Ra levels were significantly higher in neonates on day 2 (0.78 ng/ml) compared to day 4 (0.38 ng/ml).
- Gender did not influence IL-1 Ra levels.
- Neonates with severe illness exhibited markedly elevated IL-1 Ra levels compared to healthy controls on both days 2 and 4.
Conclusions:
- IL-1 Ra concentrations are physiologically higher in the first days of life, declining rapidly.
- Elevated IL-1 Ra levels in neonates strongly indicate severe illness.