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Chronic Thromboembolic Pulmonary Hypertension and Assessment of Right Ventricular Function in the Piglet
Published on: November 4, 2015
Thrombospondin-1 expression and localization in the developing ovine lung.
Foula Sozo1, Stuart B Hooper, Megan J Wallace
1Department of Physiology, Monash University, Melbourne, VIC 3800, Australia. foula.sozo@med.monash.edu.au
The Journal of Physiology
|August 19, 2007
Summary
Fetal lung expansion influences thrombospondin-1 (TSP-1) expression, a protein potentially key to lung development. Increased lung expansion elevates TSP-1 levels, while decreased expansion reduces them, suggesting TSP-1
Area of Science:
- Fetal Development
- Molecular Biology
- Pulmonary Medicine
Background:
- Fetal lung growth depends on liquid expansion, but underlying mechanisms are unclear.
- Thrombospondin-1 (TSP-1) is known to regulate cell growth, attachment, spreading, and angiogenesis.
- Investigating TSP-1's role in fetal lung development is crucial for understanding lung growth regulation.
Purpose of the Study:
- To examine the impact of altered fetal lung expansion on TSP-1 expression in sheep.
- To determine if TSP-1 plays a role in fetal lung growth regulation.
- To explore the relationship between lung expansion, TSP-1, and early growth response 1 (EGR1).
Main Methods:
- Sheep fetuses were subjected to increased and decreased lung expansion.
- TSP-1 mRNA levels were assessed using Northern blot and in situ hybridization.
- TSP-1 protein levels were quantified via immunohistochemistry.
- Early growth response 1 (EGR1) mRNA was measured using quantitative real-time PCR.
Main Results:
- Increased fetal lung expansion significantly elevated TSP-1 mRNA and protein levels.
- Decreased lung expansion markedly reduced TSP-1 mRNA and protein expression.
- TSP-1 expression was localized to type-II alveolar epithelial cells and fibroblasts.
- Increased TSP-1 expression correlated with elevated EGR1 mRNA levels.
Conclusions:
- Fetal lung expansion directly modulates TSP-1 expression in lung tissues.
- TSP-1, influenced by EGR1, is likely involved in regulating fetal lung growth.
- These findings provide insights into the molecular mechanisms governing lung development.
