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Lung morphometry, collagen and elastin content: changes after hyperoxic exposure in preterm rabbits.

Renata Suman Mascaretti1, Marta Maria Galli Bozzo Mataloun, Marisa Dolhnikoff

  • 1Pediatrics Department, Experimental Research Unit, Faculdade de Medicina da Universidade de São Paulo - São Paulo/SP, Brazil. renatasmp@uol.com.br

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|November 26, 2009
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Summary

Prolonged oxygen exposure in preterm rabbits impaired lung development, reducing alveoli number and collagen fibers. This study highlights oxygen

Keywords:
Animal modelBronchopulmonary dysplasiaLung fibersLung injuryOxygen

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Area of Science:

  • Neonatal physiology
  • Pulmonary development
  • Connective tissue biology

Background:

  • Lung development involves dynamic changes in elastic and collagen fibers.
  • Disturbed lung development, as seen in preterm infants, alters this fiber network.
  • Hyperoxia in preterm animal models is linked to impaired alveolarization and altered fiber structure.

Purpose of the Study:

  • To investigate the impact of hyperoxic exposure on lung interstitial matrix and alveolarization in preterm rabbits.
  • To assess changes in elastic and collagen fiber deposition under hyperoxia.

Main Methods:

  • Preterm rabbits (28-day gestation) were exposed to room air (21% oxygen) or high oxygen (>95%) for 11 days.
  • Lung tissue was analyzed for alveolar size (Lm), internal surface area (ISA), alveoli number, and collagen/elastic fiber density and distribution.

Main Results:

  • Hyperoxia led to increased alveolar size (Lm) and decreased alveoli number.
  • No significant difference in elastic fiber density was found.
  • Collagen fiber density was reduced, with disorganized fiber deposition observed.

Conclusions:

  • Prolonged hyperoxia in preterm rabbits mimics lung injury and arrested development.
  • Oxygen exposure impairs alveolarization and reduces collagen fiber proportion, causing network disorganization.