Redox regulation of lung development and perinatal lung epithelial function

Area of Science:

• Pulmonary Medicine
• Developmental Biology
• Cellular Physiology

Background:

• Low oxygen tension is characteristic of the fetal environment, influencing lung development until birth.
• Postnatal breathing initiates physiological and morphogenic maturation events in the lung, which can be reversed by hypoxia.

Purpose of the Study:

• To review experimental evidence on how fetal and perinatal oxygen tensions differentially affect lung morphogenesis.
• To identify key oxygen- and redox-responsive signaling pathways and regulatory loci involved in lung maturation.

Main Methods:

• Review of experimental evidence on oxygen and redox signaling in lung development.
• Identification of five key regulatory loci influencing lung morphogenesis.
• Discussion of signaling molecules such as HIF-1alpha, C/EBPbeta, ROS, thioredoxin, and NF-kappaB.

Main Results:

• Hypoxia-regulated transcription factors (HIF-1alpha, C/EBPbeta) govern mesenchymal proliferation.
• Reactive oxygen species (ROS) and nuclear oxidation impact perinatal lung epithelium.
• Thioredoxin nuclear transport, oxidation, and NF-kappaB activation are critical.
• ROS modulate intracellular glutathione and thioredoxin redox capacity.
• NF-kappaB influences Na+ transport and fluid clearance for lung aeration.

Conclusions:

• Redox events during gestation, parturition, and early neonatality significantly impact gene expression and physiological events.
• These redox-sensitive pathways are crucial for the successful transition of lung function from fetal to postnatal life.