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Development of a Neonatal Piglet Acute Lung Injury Model Recreating the Early Environment of Preterm Infant Lungs
Published on: October 31, 2025
Mechanisms of Lung Injury and Bronchopulmonary Dysplasia
1Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.
Insights
Bronchopulmonary dysplasia (BPD) affects premature infants, with significant knowledge gaps in its causes and treatments. Early steroid use shows promise in reducing BPD incidence and severity.
Area of Science:
- Neonatal Medicine
- Pediatric Pulmonology
- Developmental Biology
Background:
- Bronchopulmonary dysplasia (BPD) is a common complication in infants born before 30 weeks gestational age.
- Current understanding of BPD pathophysiology and effective targeted therapies remains limited.
- BPD incidence correlates with decreased gestational age, low birth weight, growth restriction, male sex, fetal exposures, and postnatal respiratory care.
Purpose of the Study:
- To review the significant challenges and knowledge gaps in understanding lung injury and BPD for clinicians and researchers.
- To highlight the need for improved definitions and predictive tools for BPD outcomes.
- To explore the complex interplay of prenatal and postnatal factors contributing to BPD development.
Main Methods:
- Review of existing literature on BPD epidemiology, pathophysiology, and therapeutic interventions.
- Analysis of factors contributing to lung injury, including altered lung development, birth resuscitation, and postnatal exposures.
- Examination of inflammatory pathways and the role of corticosteroids in mitigating BPD.
Main Results:
- BPD is a lung injury syndrome with clear epidemiological trends but lacks a precise definition for predicting mortality and long-term outcomes.
- Lung injury leading to BPD likely initiates during altered prenatal development and is exacerbated by postnatal factors like oxygen, ventilation, and infection.
- Recent trials demonstrate that early corticosteroid administration can reduce BPD incidence and severity, suggesting inflammation plays a key role.
Conclusions:
- BPD is a complex disease resulting from the continuous interaction of altered lung development, injury, and repair processes.
- Further research is needed to understand "adaptation" and "tolerance" responses that modulate lung injury and repair.
- Addressing knowledge gaps is crucial for developing effective strategies to prevent and treat BPD in vulnerable infants.
Abstract:
Although bronchopulmonary dysplasia (BPD) is the most frequent adverse outcome for infants born at < 30 weeks gestational age, there remain major gaps in understanding the pathophysiology, and thus there are few effective targeted therapies to prevent and treat BPD. This review will focus on the substantial problems and knowledge gaps for the clinician and investigator when considering lung injury and BPD. The epidemiology of BPD is clear: BPD is a lung injury syndrome predominantly in extremely low-birth-weight infants with an incidence that increases as gestation/birth weight decrease, with growth restriction, in males and with fetal exposures and with injury from postdelivery respiratory care. However, we do not have a good definition of BPD that identifies the infants that die of respiratory disease before 36 weeks or that predicts long-term outcomes as well. The injury resulting in BPD likely begins as altered lung development before delivery in many infants (small for gestational age, chorioamnionitis, tobacco exposure), can be initiated by resuscitating at birth, and then amplified by postnatal exposures (oxygen, mechanical ventilation, infection). Conceptually the events leading to BPD are the continued interplay of lung development that is altered progressively by injury and repair to result in poorly defined phenotypes of BPD. The injury pathways prominently cause inflammation, and as a proof of principle, corticosteroids can decrease the incidence and severity of BPD, as demonstrated by three recent trials of the early use of steroids. There are likely "adaptation" and "tolerance" responses that modulate the injury and repair to increase or decrease the damage, interactions that are not understood. BPD is a more complex disease.
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