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Updated: Oct 28, 2025

Intratracheal Instillation of Stem Cells in Term Neonatal Rats
Published on: May 4, 2020
Sustained sterile inflammation is related to pulmonary morbidities in premature infants
Yoshio Shima1,2, Sakae Kumasaka2, Yasuyuki Negishi3
1Department of Neonatal Medicine, Nippon Medical School, Musashikosugi Hospital, Kanagawa, Japan.
Objective:
Sterile inflammation, initiated by endogenous molecules such as high-mobility group box-1 (HMGB1), has come to be recognized as a critical mechanism in a variety of chronic diseases. To elucidate the involvement of sterile inflammation in neonatal disease, the association between serum HMGB1 levels and the development of bronchopulmonary dysplasia (BPD) was evaluated.
Study Design:
Serum HMGB1 levels were measured in 25 premature infants born before 33 weeks of gestation, excluding any infection cases. Samples were collected at birth, two, and four weeks of age and compared according to BPD status.
Results:
The serum HMGB1 levels in infants with BPD were maintained up to 4 weeks of age, while those without BPD declined with time. Postnatal cardiopulmonary and nutritional transition was delayed in infants with BPD.
Conclusion:
Sustained elevation of serum HMGB1 levels was associated with the development of BPD, suggesting that prolonged sterile inflammation may contribute to lung injury.
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