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Mouse Embryonic Lung Culture, A System to Evaluate the Molecular Mechanisms of Branching
Published on: June 30, 2010
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Dynamic modulation of Cyp21a1 (21-hydroxylase) expression sites in the mouse developing lung.
Catherine Gilbert1, Pierre R Provost2, Yves Tremblay2
1Reproduction, Mother and Youth Health, Centre de recherche du CHU de Québec, Québec, QC, Canada; Centre de Recherche en Reproduction, Développement et Santé Intergénérationnelle (CRDSI), Faculté de Médecine, Université Laval, Québec, QC, Canada.
The Journal of Steroid Biochemistry and Molecular Biology
|February 21, 2017
Summary
The enzyme 21-hydroxylase (Cyp21a1) is dynamically expressed in developing mouse lung epithelial and endothelial cells. Its precise location shifts with lung structure maturation, suggesting a role in lung development.
Area of Science:
- Developmental biology
- Endocrinology
- Pulmonary medicine
Background:
- 21-hydroxylase (Cyp21a1) is crucial for glucocorticoid synthesis.
- Local glucocorticoid production is proposed to influence lung development.
- The precise expression sites of Cyp21a1 in the developing lung remain unclear.
Purpose of the Study:
- To map the spatiotemporal expression of Cyp21a1 in the developing mouse lung.
- To correlate Cyp21a1 expression patterns with specific lung structural changes.
Main Methods:
- In situ hybridization was used to detect Cyp21a1-mRNA.
- Analysis spanned from the pseudoglandular stage (GD 15.5) to the alveolar stage (PND 15).
- Expression was examined in epithelial, endothelial, and mesenchymal cells.
Main Results:
- Cyp21a1 mRNA was primarily detected in epithelial cells from GD 15.5 to PND 5.
- Expression sites shifted from distal epithelium to proximal epithelium and saccule walls.
- During alveolarization, expression transitioned from type I pneumocytes to capillary endothelial cells.
- Arterial and some venous walls also showed Cyp21a1 expression; mesenchyme was largely negative.
Conclusions:
- Cyp21a1 expression is dynamically modulated throughout lung development.
- Expression persists in distal lung structures, adapting to changing morphology.
- These findings support a role for local glucocorticoids in lung development.
