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- W1999024204 abstract "Granulocyte-macrophage colony-stimulating factor (GM-CSF) is a hematopoietic cytokine that is low in airway specimens from immature lungs at birth. In adult mice, an absence of GM-CSF causes excessive accumulation of alveolar surfactant due to a lack of catabolism. Our aim was to investigate whether recombinant human GM-CSF (rhGM-CSF) affects the pool sizes or the turnover of disaturated phosphatidylcholine (DPC) in preterm (gestation 29 d) rabbits at birth and in term rabbits, age 3 d. 3H-labeled dipalmitoyl phosphatidylcholine, 14C-acetate, and either rhGM-CSF (125 or 25 μg/kg body weight) or placebo were given intratracheally. Thereafter, the intra- and extracellular surfactant fractions were isolated and quantified for DPC and radioactivity. In preterm animals, GM-CSF increased dose-dependently within 24 h both the pool sizes of surfactant DPC and the 3H,14C-labeling of surfactant DPC (p< 0.05). The expression of surfactant protein B mRNA was unaffected, whereas surfactant protein B in bronchoalveolar lavage increased. The number of cells in the whole lung, the type II alveolar epithelial cells, and the lavageable alveolar macrophages were unaffected. At term, rhGM-CSF increased the turnover but did not affect the pool sizes of surfactant DPC. Intraperitoneal rhGM-CSF increased blood eosinophils but had no effect on surfactant DPC. Depending on the degree of lung maturity, GM-CSF in the alveolar space may either up-regulate the pool size or increase the turnover of surfactant phospholipid after birth." @default.
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- W1999024204 date "1999-11-01" @default.
- W1999024204 modified "2023-10-18" @default.
- W1999024204 title "Granulocyte-Macrophage Colony-Stimulating Factor Increases Surfactant Phospholipid in Premature Rabbits" @default.
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- W1999024204 doi "https://doi.org/10.1203/00006450-199911000-00020" @default.
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