Partial pulmonary embolization disrupts alveolarization in fetal sheep

Area of Science:

• Pulmonary Medicine
• Developmental Biology
• Neonatology

Background:

• Bronchopulmonary dysplasia (BPD) is linked to impaired alveolar and pulmonary capillary development.
• The causal relationship between pulmonary capillary development and alveolar formation in BPD remains unclear.

Purpose of the Study:

• To investigate the relationship between pulmonary capillaries and alveolar formation.
• To establish a model for studying BPD pathogenesis.

Main Methods:

• Partial pulmonary embolization (PPE) was performed in fetal sheep.
• Lung morphology, elastin, collagen, myofibroblast, and specific protein/gene expression were analyzed.
• Histological and real-time PCR techniques were employed.

Main Results:

• PPE led to increased lung tissue percentage and reduced secondary septal crest density, indicating impaired alveolarization.
• Differentiated myofibroblast and elastin deposition were reduced in embolized lung regions.
• Transient hypoxia and altered PDGF-R alpha expression were observed, potentially affecting alveolar myofibroblast differentiation.

Conclusions:

• Partial pulmonary embolization impairs alveolarization in fetal sheep without causing systemic adverse effects.
• This method provides a novel model for studying the roles of pulmonary capillaries and alveolar myofibroblasts in lung development.