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W2285507813 abstract "Prolonged mechanical ventilation of premature neonates is often associated with abnormal morphological development of the lung and chronic lung disease, sometimes called bronchopulmonary dysplasia (BPD). Impaired alveolar development is a hallmark of this disease. To better understand the effects of mechanical ventilation on lung elastin expression, we studied lung tissue from 10 preterm lambs (gestation = 125 days; term = 148 days) mechanically ventilated for 3-4 wk at a respirator rate of 20 breaths/min and tidal volume of 15 +/- 5 ml/kg (n = 5) or 60 breaths/min and tidal volume of 5 +/- 2 ml/kg (n = 5). Histopathology showed increased elastin accumulation and abnormal morphological development in the ventilated groups. Postmortem lung desmosine content was increased significantly in the 20 breaths/min group. Tropoelastin mRNA expression was increased in both ventilated groups. In situ hybridization localized increased tropoelastin mRNA expression to sites of accumulated elastin in extended alveolar walls with scant, attenuated secondary crests. Lung collagen content, as assessed by the amount of hydroxyproline in lung tissue, was similar to controls. These data suggest that excessive production and accumulation of elastin is associated with chronic lung injury from prolonged mechanical ventilation after premature birth." @default.
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W2285507813 date "1997-03-01" @default.
W2285507813 modified "2023-10-18" @default.
W2285507813 title "Chronic lung injury in preterm lambs: disordered pulmonary elastin deposition" @default.
W2285507813 doi "https://doi.org/10.1152/ajplung.1997.272.3.l452" @default.
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