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Immunolocalization of sonic hedgehog (Shh) in developing mouse lung.
L A Miller1, S E Wert, J A Whitsett
1Children's Hospital Medical Center, Division of Pulmonary Biology, Cincinnati, Ohio 45229-3039, USA.
Summary
Sonic hedgehog (Shh) is crucial for lung development. This study reveals Shh expression persists in adult mouse lung airways, suggesting a role in later lung morphogenesis and cell differentiation.
Area of Science:
- Developmental Biology
- Pulmonology
- Molecular Biology
Background:
- Sonic hedgehog (Shh) signaling is essential for embryonic lung development.
- Shh loss in mice leads to severe lung abnormalities like tracheoesophageal fistula and hypoplasia.
Purpose of the Study:
- To investigate the role of Shh in later stages of lung morphogenesis beyond embryogenesis.
- To map the expression patterns of Shh in the mouse lung from embryonic to postnatal stages.
Main Methods:
- Immunohistochemistry was used to detect Shh expression in mouse lung tissue.
- Analysis spanned from embryonic day (E) 10.5 to postnatal day (PD) 24.
- Shh localization was compared with markers for specific cell types, including Clara cells (CCSP).
Main Results:
- Shh was initially detected in the distal lung epithelium during early embryogenesis (E10.5-E16.5).
- Post-E16.5, Shh expression became restricted to subsets of epithelial cells in both peripheral and conducting airways.
- Shh expression patterns correlated with Clara cells in conducting airways but not with cilia or other tested markers.
Conclusions:
- Shh plays a significant role in lung development beyond initial organogenesis.
- The restricted expression suggests Shh influences the formation and cytodifferentiation of conducting airway cells, particularly Clara cells.
- Further research into Shh's role in airway cell regulation is warranted.