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Related Experiment Videos

Biochemical and morphometric analyses in hypoplastic lungs.

J S Wigglesworth1, A A Hislop, R Desai

  • 1Department of Histopathology, Royal Postgraduate Medical School, Hammersmith Hospital, London, England.

Pediatric Pathology
|July 1, 1991
PubMed
Summary

Infant lungs with oligohydramnios (OH) show impaired epithelial maturation and lower disaturated phosphatidylcholine (DSPC) despite similar hypoplasia to non-oligohydramnios (NOH) lungs. This suggests abnormal epithelial-mesenchymal interactions in OH lungs.

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Area of Science:

  • Neonatal Physiology
  • Pulmonary Development
  • Developmental Biology

Background:

  • Bilateral lung hypoplasia is a severe condition affecting infant lung development.
  • Oligohydramnios (OH) is associated with lung hypoplasia, but the specific impact on lung maturation is not fully understood.
  • Comparing lungs with and without OH provides insight into factors influencing lung growth.

Purpose of the Study:

  • To compare biochemical and morphometric features of infant lungs with and without oligohydramnios (OH) to normally grown lungs.
  • To investigate the role of oligohydramnios in lung hypoplasia and epithelial maturation.
  • To explore potential differences in lung composition and structure between OH and non-OH (NOH) hypoplastic lungs.

Main Methods:

  • Biochemical analysis of lung tissue for DNA, disaturated phosphatidylcholine (DSPC), hydroxyproline, and desmosine concentrations.

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  • Morphometric analysis to assess lung volume, radial alveolar counts, alveolar number, and alveolar surface area.
  • Histological examination to evaluate lung structure and elastin presence.

    • Main Results:

    • Both OH and NOH lungs showed similar hypoplasia (DNA content) but OH lungs had significantly lower DSPC concentrations.
    • Hydroxyproline concentration was higher in OH lungs, despite reduced elastin in some cases.
    • Morphometry revealed reduced lung volume, alveolar counts, and surface area in both groups, with differences in the proportion of alveoli and alveolar ducts.

    Conclusions:

    • Lung hypoplasia in infants, whether with or without oligohydramnios, is characterized by reduced lung volume and surface area.
    • Oligohydramnios is associated with impaired lung epithelial maturation and altered lung surfactant composition (lower DSPC), suggesting abnormal epithelial-mesenchymal interactions.
    • Lung maturation may not solely depend on the quantitative development of airways and alveoli, but also on complex signaling pathways.