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Cell death and lung cell histology in meconium aspirated newborn rabbit lung
1Department of Pediatrics, Michael Reese Hospital, Chicago, IL 60616, USA.
Unlabelled:
Meconium aspiration syndrome (MAS) is a major cause of newborn mortality and morbidity. In this study we investigated the inflammatory responses and morphological changes in the newborn lung to debris-free meconium instillation. We developed a model for studies of MAS using 2-week-old rabbit pups. Cell death was assessed by DNA staining and detection of DNA fragmentation by in situ end labeling. Cell death was seen in association with an increase of inflammatory cytokines levels, studied by ELISA. Necrotic cells were detected by staining of lavage cells with ethidium bromide and 4',6'-diamino-2'-phenylidon. Meconium instillation resulted selectively in loss of airway and alveolar epithelial cells followed by cell death, which increased with time. Necrotic cells looked smaller and damaged with maximal counts at 24 h after instillation.
Conclusion:
Meconium instillation into lungs caused massive cell death, possibly by apoptosis, and necrosis that may have been activated by the inflammatory cytokine production.
Insights
Meconium aspiration syndrome (MAS) causes newborn mortality. This study shows meconium instillation in rabbit pups leads to significant lung cell death and inflammation.
Area of Science:
- Neonatalogy
- Pulmonary Medicine
- Cell Biology
Background:
- Meconium aspiration syndrome (MAS) is a significant cause of mortality and morbidity in newborns.
- Understanding the lung's response to meconium is crucial for developing effective treatments.
Purpose of the Study:
- To investigate the inflammatory responses and morphological changes in the newborn lung following debris-free meconium instillation.
- To establish a rabbit pup model for studying MAS.
Main Methods:
- A model of MAS was developed using 2-week-old rabbit pups.
- Cell death was assessed using DNA staining and in situ end labeling.
- Inflammatory cytokine levels were measured by ELISA, and necrotic cells were identified via specific staining.
Main Results:
- Meconium instillation led to selective loss of airway and alveolar epithelial cells.
- Cell death increased over time, with maximal necrotic cell counts observed at 24 hours post-instillation.
- Increased inflammatory cytokine levels were observed in conjunction with cell death.
Conclusions:
- Meconium instillation into the lungs triggers massive cell death, potentially through apoptosis and necrosis.
- Inflammatory cytokine production may play a key role in activating these cell death pathways in MAS.