Adaptation of the Oxygen Sensing System during Lung Development

Area of Science:

• Molecular Biology
• Developmental Biology
• Neonatal Physiology

Background:

• Oxygen supply drastically changes after birth, impacting premature infants.
• The developing lung's oxygen sensing system adapts to postnatal ventilation.
• Hypoxia-inducible factor (HIF)-regulated genes (HRGs) are crucial targets.

Purpose of the Study:

• To detail the adaptation of the oxygen sensing system in the developing lung.
• To investigate the role of HIF-regulated genes during lung maturation.
• To understand oxygen sensing for preventing prematurity-associated diseases.

Main Methods:

• Integrated data from qPCR, immunoblotting, in situ hybridization, and single-cell RNA sequencing.
• Utilized ex vivo lung organ cultures and in vivo mouse models.
• Analyzed HIF1α protein stability and expression of HIF-PHD system components.

Main Results:

• HIF1α protein destabilized post-ventilation, but HRG expression changes were limited.
• Modified HIF-PHD system composition observed: decreased Phd3, increased Hif2a, and P0-specific Ipas peak.
• Hif1a-Phd1 axis identified as key regulator, complemented by Hif3a-Phd3 during gestation.

Conclusions:

• The lung's oxygen sensing system undergoes significant adaptation during development.
• HIF pathway components show dynamic changes, with specific axes dominating different developmental phases.
• Understanding these adaptations is vital for addressing prematurity-related lung diseases like bronchopulmonary dysplasia.