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Am J Physiol Lung Cell Mol Physiol 282: L1012-L1022, 2002. First published December 14, 2001; doi:10.1152/ajplung.00371.2001
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Vol. 282, Issue 5, L1012-L1022, May 2002

Fusion of lung lobes and vessels in mouse embryos heterozygous for the forkhead box f1 targeted allele

Lorena Lim1, Vladimir V. Kalinichenko1, Jeffrey A. Whitsett2, and Robert H. Costa1

1 Department of Molecular Genetics, College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60607-7170; and 2 Division of Pulmonary Biology, Children's Hospital Medical Center, Cincinnati, Ohio 45229-3039

Previously, we showed that newborn forkhead box (Fox)f1(+/-) mice with diminished pulmonary FoxF1 levels died of severe lung hemorrhage and exhibited abnormal formation of alveolar sacs and capillaries. Another group recently reported that Foxf1(+/-) mouse embryos displayed a number of organ and skeletal defects including fusion of lung lobes. However, identification of pulmonary genes whose altered expression was associated with the lobular fusion defect in Foxf1(+/-) lungs remains uncharacterized. The present study was conducted to determine the nature of the malformations leading to lung fusions in the FoxF1 embryos and to identify potential signaling pathways influenced by FoxF1 haploinsufficiency. We show that Foxf1(+/-) embryos exhibit defects in formation and branching of primary lung buds, which causes fusion of the right lung lobes and vessels. The severity of the Foxf1(+/-) lung fusions was correlated with decreased levels of FoxF1 mRNA. In situ hybridization studies demonstrated that the defective primary lung-bud development in early Foxf1(+/-) embryos was associated with fewer pulmonary mesenchymal-epithelial interfaces. Defects in branching morphogenesis in the Foxf1(+/-) embryos were associated with altered expression of the fibroblast growth factor-10, bone morphogenetic protein-4, and the Gli3 transcription factor, which are known to influence primary lung-bud development.

fibroblast growth factor-10; Gli3; bone morphogenetic protein-4; Patched; winged-helix transcription factor; defective lung-bud formation


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