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Endogenous antioxidant defenses in neonates
Insights
Premature infants exposed to oxygen show increased superoxide dismutase (SOD) levels, an antioxidant defense. Further research is needed to determine if this SOD increase helps prevent bronchopulmonary dysplasia (BPD).
Area of Science:
- Neonatal physiology
- Biochemistry
- Pulmonology
Background:
- Bronchopulmonary dysplasia (BPD) may stem from impaired antioxidant defenses.
- Premature neonates with respiratory distress syndrome (RDS) often require prolonged oxygen therapy.
- Evaluating antioxidant responses in neonates exposed to oxygen is crucial.
Purpose of the Study:
- To assess the neonates' capacity to elevate superoxide dismutase (SOD) levels in response to oxygen exposure.
- To investigate the temporal changes in plasma SOD levels during the first week of life in premature infants.
Main Methods:
- Studied 9 premature neonates from birth through day 7.
- Measured plasma superoxide dismutase (SOD) levels at multiple time points.
- Analyzed SOD levels in neonates exposed to oxygen therapy.
Main Results:
- Plasma SOD levels increased significantly in neonates exposed to oxygen during the first week of life.
- Mean SOD levels rose from 1.28 microgram/ml at birth to 2.25 micrograms/ml by day 3 (P = .003).
- This increasing trend in SOD levels persisted through day 7.
Conclusions:
- Premature neonates demonstrate an enhanced antioxidant response (increased SOD) to oxygen exposure.
- The clinical significance of this elevated SOD in preventing bronchopulmonary dysplasia (BPD) warrants further investigation.
Abstract:
Deficiencies of antioxidant defenses have been postulated as possible mechanisms in the development of bronchopulmonary dysplasia (BPD). Neonates, especially prematures with respiratory distress syndrome (RDS), are exposed to high oxygen tensions for prolonged periods. To evaluate the neonates' ability to respond to an oxygen challenge with increased superoxide dismutase (SOD), 9 prematures were studied immediately at birth and on days 1, 3, 5, and 7. An increase in plasma levels was noted during the first week of life in the patients who were exposed to oxygen. The mean endogenous SOD level at birth was 1.28 microgram/ml. On day 1, plasma SOD rose to 1.53 microgram/ml and to 2.25 micrograms/ml on day 3 (P = .003). This trend continued into the fifth and seventh days. Whether this increase in SOD has clinical significance in the prevention of BPD requires further investigation.