1,25-Dihydroxyvitamin D3 and fetal lung maturation: immunogold detection of VDR expression in pneumocytes type II cells and effect on fructose 1,6 bisphosphatase

The Journal of Steroid Biochemistry and Molecular Biology
M NguyenM Garabédian

Abstract

Lung maturation before birth includes type II pneumocyte differentiation with progressive disappearance of glycogen content and onset of surfactant synthesis. We have shown previously that 1,25-(OH)2D3 increases surfactant synthesis and secretion by type II cells and decreases their glycogen content in fetal rat lung explants. Recently, the gene coding fructose 1,6 bisphosphatase (F1,6BP), a regulatory enzyme of gluconeogenesis, has been identified in type II cells and its promoter bears a Vitamin D response element. Present results show:The coexistence of type II cells at different stages of maturation. in rat fetal lung on day 21 of gestation (electron microscopy), and the association between maturation of type II cells and disappearance of their glycogen content. The immunogold labeling of all type II cells when using the 9A7g VDR-antibody, with significantly more abundant gold particles in cells exhibiting an intermediate glycogen content. The expression of F1,6BP mRNA in a human type II cell line (NCI-H441) and the increase of this expression after 18h incubation with 1,25-(OH)2D3 (10(-8)M). These results bring further evidence for a physiological role of 1,25-(OH)2D3 during type II pneumocyte maturation. Activation of F1,...Continue Reading

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