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Updated: May 31, 2026
08:26
Transcriptional Analysis by Nascent RNA FISH of In Vivo Trophoblast Giant Cells or In Vitro Short-term Cultures of Ectoplacental Cone Explants
Published on: August 31, 2016
The oncogene Trop2 regulates fetal lung cell proliferation
Annie R A McDougall1, Stuart B Hooper, Valerie A Zahra
1The Ritchie Centre, Monash Institute of Medical Research, Monash University, Clayton, Australia.
Summary
Trophoblast antigen 2 (Trop2) regulates fetal lung cell proliferation. Its expression increases with lung expansion and correlates with cell growth, demonstrating its role in lung development.
Area of Science:
- Developmental biology
- Cell biology
- Pulmonary medicine
Background:
- Fetal lung development is critical but poorly understood.
- Fetal lung expansion significantly impacts lung growth.
- The oncogene Trop2 (trophoblast antigen 2) is implicated in accelerated lung growth.
Purpose of the Study:
- To investigate the role of Trop2 in normal and altered fetal lung growth.
- To determine if Trop2 expression is regulated by fetal lung expansion or glucocorticoids.
- To examine the relationship between Trop2 and lung cell proliferation.
Main Methods:
- Real-time PCR to measure Trop2 expression in sheep lungs at different gestational ages.
- In situ hybridization and immunofluorescence for spatial localization of Trop2.
- Small interfering RNA (siRNA) to assess Trop2 function in cultured rat lung fibroblasts.
Main Results:
- Trop2 expression decreased with normal lung development and correlated positively with cell proliferation.
- Increased fetal lung expansion elevated Trop2 expression, while decreased expansion reduced it.
- Trop2 protein localized to fibroblasts and type II alveolar cells, and Trop2 knockdown reduced fibroblast proliferation.
Conclusions:
- Trop2 regulates lung cell proliferation during fetal development.
- Fetal lung expansion, not glucocorticoids, modulates Trop2 expression.
- Trop2 is a key mediator of lung growth influenced by mechanical forces.
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