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The effects of intermittent starvation on lung development in suckling rats
Insights
Early postnatal starvation significantly hinders lung development in rats, impacting lung growth and structure. These adverse effects persist even after a week of normal feeding, highlighting the critical vulnerability of developing lungs.
Area of Science:
- Developmental Biology
- Pulmonology
- Nutritional Science
Background:
- Postnatal lung development is a critical process susceptible to environmental factors.
- Nutritional status significantly influences organogenesis and growth during early life.
Purpose of the Study:
- To investigate the impact of intermittent early postnatal starvation on lung growth and morphology in rats.
- To determine if recovery feeding can mitigate the effects of starvation on lung development.
Main Methods:
- Rat pups were subjected to two 24-hour starvation periods on postnatal days 1 and 5.
- Lung growth parameters (volume, alveolar number, surface area) and morphology were assessed on postnatal days 7 and 14.
- Control groups received normal nutrition throughout the study period.
Main Results:
- Intermittent starvation led to reduced somatic and lung growth, with decreased lung volume, alveolar number, and internal surface area by postnatal day 7.
- While structural differences were minimal at day 7, significant morphological changes were observed by day 14 in starved rats.
- One week of normal suckling post-starvation could not reverse the initial detrimental effects on lung development.
Conclusions:
- Early postnatal starvation adversely affects normal lung development in rats.
- The observed retardation in lung growth parameters and morphology indicates a lasting impact of nutritional insult during a critical developmental window.
- These findings underscore the importance of adequate nutrition for optimal postnatal lung maturation.
Abstract:
The effect of starvation on postnatal lung growth in rats was investigated. Litters were starved twice, each time for 24 hours, on Day 1 and Day 5 after birth. One group of littermates was sacrificed on Day 7, and another group, on Day 14 of postnatal life. Intermittent starvation diminished lung growth. This was accompanied by reduced somatic growth. On postnatal Day 7, lung volume, total number of alveoli, and internal surface area of the lung were decreased in starved rats, but structurally their lungs appeared similar to control lungs. On postnatal Day 14, a striking morphologic difference was observed between the lungs of control and starved pups. Following starvation, retardation of lung growth was manifested in all the parameters studied. One week of normal uninterrupted suckling could not overcome the starvation-induced initial effects on growing lungs. It is concluded that starvation, soon after birth, affects adversely the normal development of lung.