Selenium modulates perinatal pulmonary vascular responses to hyperoxia.

Area of Science:

• Pulmonary Medicine
• Developmental Biology
• Nutritional Science

Background:

• Infant lung development requires healthy vasculature, but premature lungs are vulnerable.
• Supplemental oxygen, while life-saving, can cause oxidative stress and bronchopulmonary dysplasia (BPD).
• Selenium is vital for antioxidant defense, and its deficiency may impair lung development.

Purpose of the Study:

• To investigate how selenium deficiency and postnatal oxygen exposure impact lung vascular development.
• To analyze gene expression changes in lung endothelial cells under these conditions.

Main Methods:

• A mouse model of perinatal selenium deficiency was used.
• Mice were exposed to normal or high oxygen conditions post-birth.
• Lung vascularity was assessed at postnatal day 14.
• RNA sequencing and qRT-PCR analyzed gene expression in P3 lungs.

Main Results:

• Both selenium deficiency and oxygen exposure independently reduced pulmonary arteriole numbers at P14.
• Selenium deficiency exacerbated oxygen-induced reductions in pulmonary vasculature.
• Gene expression analysis revealed decreased transcription of endothelial cell markers (Aplnr, Ptprb) in both conditions.

Conclusions:

• Perinatal selenium deficiency increases susceptibility to hyperoxic lung injury.
• Selenium deficiency impairs lung vascular development and may contribute to BPD pathogenesis.
• Altered gene expression in endothelial cells is associated with reduced vessel density in this BPD model.