Effect of gestational age on the increase in fetal lung growth following tracheal obstruction

E. Keramidaris, S. B. Hooper, R. Harding

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The growth response of the fetal lung to increased expansion was compared at two gestational ages. In fetal sheep, lung expansion was increased by occluding the trachea for 48 h at either 112-114 days (younger fetuses) or 125-127 days (older fetuses) of gestation (term is ~ 145 days). After 24 h of tracheal occlusion, the volumes of liquid that could be drained from the lungs were increased by 64.7 and 158% above control in younger and older fetuses respectively; the volumes were not increased further after 48 h. In younger fetuses, 48 h of tracheal occlusion increased (p < .05) fetal lung wet weights (21% above control) and protein contents (43% above control) but not DNA contents. In older fetuses, 48 h of tracheal occlusion increased (p < .05) fetal lung wet weights (61% above control). However, 48 h of tracheal occlusion did not alter total lung hydroxyproline content at either age, resulting in a reduction in the hydroxyproline protein ratio of the fetal lungs. The results suggest what the lung growth response to tracheal occlusion is greater accumulation of lung liquid and hence a greater increase in lung expansion, in older fetuses.

Original languageEnglish
Pages (from-to)283-298
Number of pages16
JournalExperimental Lung Research
Issue number3
Publication statusPublished - 1 Jan 1996


  • DNA
  • fetus
  • hydroxyproline
  • lung growth
  • protein

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