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Neonatal ACE inhibition in rats interferes with lung development
Daina Lasaitiene1, Yun Chen, Ulf Nannmark
1Department of Physiology, University of Gothenburg, Gothenburg, Sweden. daina.lasaitiene@fysiologi.gu.se
Clinical Physiology and Functional Imaging
|January 14, 2004
Summary
Early postnatal inhibition of angiotensin-converting enzyme (ACE) in rats altered lung development, widening airspaces and thinning septa. This intervention also reduced bronchoalveolar lavage fluid surface tension.
Area of Science:
- Pulmonology
- Developmental Biology
- Pharmacology
Background:
- The renin-angiotensin system (RAS) is crucial for kidney development and is upregulated during development.
- Mammalian lungs exhibit high angiotensin-converting enzyme (ACE) levels, with activity increasing postpartum.
- Rat lungs undergo significant postnatal development, making them a relevant model.
Purpose of the Study:
- To investigate the impact of early postnatal ACE inhibition on lung development in rats.
- To test the hypothesis that ACE inhibition influences the structural and functional maturation of the lung.
Main Methods:
- Administered the ACE inhibitor enalapril to neonatal rats from day 0 to 9.
- Evaluated lung structure using light microscopy at postnatal days 4 and 9.
- Measured the surface tension of bronchoalveolar lavage fluid using a Wilhelmy balance.
Main Results:
- Neonatal ACE inhibition led to a significant reduction in the surface tension of bronchoalveolar lavage fluid.
- Histological examination revealed widening of respiratory airspaces in treated rats.
- Thinning of alveolar septa was observed as a consequence of early postnatal ACE inhibition.
Conclusions:
- Early postnatal ACE inhibition interferes with normal lung development in rats.
- ACE inhibition impacts lung structure, potentially affecting respiratory function.
- Further research is warranted to understand the long-term implications of this developmental interference.