Identification of new biomarkers for the prediction of disease onset and for therapy evaluation in preterm infants with bronchopulmonary dysplasia

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Here, we examined levels of carboxyhemoglobin (CO-Hb) and methemoglobin (Met-Hb), markers of CO production and NO production, respectively, and discuss the usefulness of these markers to predict bronchopulmonary dysplasia (BPD) in preterm infants. CO-Hb levels in infants with moderate/severe BPD on postnatal days 5-7 were significantly higher than those in infants with no/mild BPD. Levels of urinary oxidative stress markers, i.e., advanced oxidative protein product (AOPP) and 8-hydroxydeoxyguanosine (8-OHdG), in infants with moderate/severe BPD also tended to be higher than those in infants with no/mild BPD on postnatal days 5-7. Thus, our data suggest that high levels of CO-Hb during the early neonatal period may reflect induction of hemeoxygenase-1 (HO-1) by oxidative stress and that CO-Hb levels are useful for early prediction of moderate/severe BPD in preterm infants.