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Early protein oxidation in the neonatal lung is related to development of chronic lung disease
E Varsila1, E Pesonen, S Andersson
1Children's Hospital, University of Helsinki, Finland.
Insights
Protein oxidation in newborn infants is linked to chronic lung disease development. Prematurity is a key factor in this free radical damage, impacting infant lung health.
Area of Science:
- Neonatal Medicine
- Pulmonary Research
- Oxidative Stress Biology
Background:
- Free radical-mediated protein oxidation can lead to cellular damage and impaired function.
- Oxidative stress is implicated in the pathogenesis of various chronic diseases.
- Understanding protein oxidation in vulnerable populations like preterm infants is crucial.
Purpose of the Study:
- To investigate pulmonary protein oxidation in newborn infants requiring intensive care.
- To determine the association between protein oxidation and the development of chronic lung disease, specifically bronchopulmonary dysplasia.
- To identify factors contributing to protein oxidation in this population.
Main Methods:
- Studied 61 newborn infants (24-41 weeks gestational age) requiring intensive care and oxygen therapy.
- Quantified protein oxidation as protein carbonylation in daily tracheal aspirates during the first week of life.
- Utilized correlation and multiple regression analyses to assess relationships between protein carbonylation, gestational age, oxygen exposure, and bronchopulmonary dysplasia.
Main Results:
- Significant negative correlations were observed between protein carbonylation and gestational age on days 2-4.
- Infants who developed bronchopulmonary dysplasia exhibited significantly higher protein carbonylation from days 1-6.
- Protein carbonylation on day 3 was a significant independent predictor of bronchopulmonary dysplasia, even when accounting for gestational age and oxygen exposure.
Conclusions:
- Infant immaturity is the primary driver of free radical-mediated pulmonary protein oxidation.
- Pulmonary protein oxidation is significantly associated with the development of chronic lung disease in newborn infants.
- Targeting oxidative stress may be a potential strategy for preventing chronic lung disease in preterm infants.
Abstract:
Free radical-mediated oxidation of proteins may impair their function and cause cellular damage. We studied pulmonary protein oxidation and its association with the development of chronic lung disease in 61 newborn infants (mean gestational age 31.1 +/- 4.0, range 24-41 weeks) requiring intensive care with oxygen therapy. Protein oxidation was quantified as protein carbonylation in tracheal aspirates recovered daily during the first week of life. Mean carbonyl concentration was 3.5 +/- 1.6 mumol/mg protein. Negative correlations existed between protein carbonylation during days 2-4 and gestational age (day 2: r = -0.37, p = 0.01; day 3: r = -0.48, p = 0.001; and day 4: r = -0.33, p = 0.03). Patients who developed bronchopulmonary dysplasia showed significantly higher protein carbonylation on days 1-6 (all p < 0.05). In multiple regression analysis explaining bronchopulmonary dysplasia, using gestational age, inspired oxygen on days 1-3 and protein carbonylation on day 3 as independent variables, only protein carbonylation remained significant. We conclude that immaturity is the most important factor explaining free radical-mediated pulmonary protein oxidation in newborn infants and that oxidation of proteins is related to the development of chronic lung disease.