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Updated: Aug 10, 2026
Mouse Pneumonectomy Model of Compensatory Lung Growth
Published on: December 17, 2014
Comparative biochemistry of gestational and postnatal lung growth and development in the rat and human
K Cherukupalli1, J E Larson, M Puterman
1Department of Pathology, University of British Columbia, Vancouver, Canada.
Insights
Lung development in humans and rats differs significantly, with elastin accumulation occurring during gestation in humans but postnatally in rats. This study provides data for assessing human pulmonary hypoplasia.
Area of Science:
- Comparative developmental biology
- Pulmonary medicine
- Biochemistry
Background:
- Lung development involves complex biochemical and structural changes.
- Understanding species-specific lung ontogeny is crucial for neonatal care and disease assessment.
Purpose of the Study:
- To compare the developmental trajectories of key lung components (collagen, elastin, protein, DNA) in rats and humans.
- To identify differences in lung growth patterns and biochemical maturation between species.
- To provide predictive data for assessing human pulmonary hypoplasia.
Main Methods:
- Quantification of hydroxyproline (collagen), desmosine (elastin), soluble protein, and DNA in lung tissue.
- Analysis of lung weight/body weight ratios and water content.
- Comparison of developmental timelines during gestation and postnatal life in rats and humans.
Main Results:
- Human lung weight/body weight ratios declined faster during gestation than postnatally; rat ratios showed little decline during gestation then a sharp drop postnatally.
- Elastin accumulation occurred rapidly during human gestation, suggesting a role in intrauterine alveolar formation, while in rats, it was primarily a postnatal event.
- Hydroxyproline and desmosine concentrations showed distinct accumulation patterns, with humans exhibiting continued slow increases while rat concentrations leveled off.
Conclusions:
- Significant species-specific differences exist in lung growth patterns and the timing of elastin accumulation.
- Human lung development exhibits more intrauterine maturation of elastin compared to rats.
- The findings offer insights into potential mechanisms of pulmonary hypoplasia and provide reference data for human lung development.
Abstract:
We compared the ontogeny of collagen (hydroxyproline), elastin (desmosine), soluble protein, and DNA in the lungs of rate and humans during gestation and postnatal life. In humans, lung weight/body weight ratios declined faster during gestation than postnatally, whereas in rats lung weight/body weight ratio declined little during gestation and then suddenly on the first day of life. Lung weight/body weight ratios may be lower than expected around term in humans, and prediction data are given to assess human pulmonary hypoplasia. Rats and humans differed in water content of their lungs, with rats showing a sharper decline during gestation. In the human lung, collagen and elastin made their appearance at an early stage of gestation; elastin. In particular, increased rapidly during gestation, suggesting a role in intrauterine alveolar formation. In the rat, elastin accumulation is primarily a postnatal event, as is alveolar formation. Hydroxyproline concentrations increased with conceptual age and continued to increase rapidly postnatally between 4 and 7 weeks in the rat, but slowed in the human after 60 weeks of conceptual age. Desmosine concentrations level off at the end of the study period in rats, while these are still increasing, although slowly, in humans. Overall lung growth, as assessed by weight, was linear in humans, but phases of lung growth were apparent in the rat, including one of minimal growth in the immediate postnatal period.
