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pubmed-article:2435726pubmed:abstractTextSynthesis of surfactant-associated glycoprotein of Mr = 30,000-35,000 (SAP-35) was induced in explant culture of human fetal lung obtained from 8 to 24 weeks of gestation. SAP-35 synthesis and content increased markedly during 1-5 days in organ culture in association with the morphologic maturation of Type II epithelial cells and the appearance of lamellar bodies. [35S] Methionine labeling of the explants and subsequent immunoprecipitation of SAP-35 demonstrated distinct high-mannose precursors and sialylated SAP-35 forms as early in culture as SAP-35 synthesis was detectable. The increase in SAP-35 synthesis was associated with increased SAP-35 RNA of 2.1 kilobases as assessed by hybridization assay with [32P]cDNA specific for human SAP-35. Specific SAP-35 RNA increased during organ culture and both SAP-35 content and SAP-35 RNA increased in the absence of exogenous hormones in 2% carbon-stripped fetal calf serum. SAP-35 content and synthesis was stimulated by 8-Br-cAMP. Addition of 100 microM 8-Br-cAMP, enhanced both the concentration of SAP-35 protein and the SAP-35 RNA as assessed by hybridization assay. In contrast, treatment of the explants with dexamethasone was associated with decreased SAP-35 protein synthesis, SAP-35 content, and decreased SAP-35 RNA levels compared to untreated explants. Inhibition by dexamethasone occurred at all gestational ages tested, was dose-dependent, and detectable within 24-48 h during organ culture. Dexamethasone significantly inhibited both basal and cAMP-induced SAP-35 synthesis. Induction of pulmonary surfactant protein (SAP-35) synthesis during organ culture of human fetal lung was associated with increased SAP-35 RNA. SAP-35 synthesis and SAP-35 RNA were inhibited by dexamethasone and enhanced cAMP.lld:pubmed
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pubmed-article:2435726pubmed:articleTitleInduction of surfactant protein in fetal lung. Effects of cAMP and dexamethasone on SAP-35 RNA and synthesis.lld:pubmed
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