Foxf1 haploinsufficiency reduces Notch-2 signaling during mouse lung development

Vladimir V. Kalinichenko, Galina A. Gusarova, Il Man Kim, Brian Shin, Helena M. Yoder, Jean Clark, Alexander M. Sapozhnikov, Jeffrey A. Whitsett, Robert H. Costa

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

The forkhead box (Fox) f1 transcription factor is expressed in the mouse splanchnic (visceral) mesoderm, which contributes to development of the liver, gallbladder, lung, and intestinal tract. Pulmonary hemorrhage and peripheral microvascular defects were found in approximately half of the newborn Foxf1(+/-) mice, which expressed low levels of lung Foxf1 mRNA [low-Foxf1(+/-) mice]. Microvascular development was normal in the surviving newborn high-Foxf1(+/-) mice, which compensated for pulmonary Foxf1 haploinsufficiency and expressed wild-type Foxf1 levels. To identify expression of genes regulated by Foxf1, we used Affymetrix microarrays to determine embryonic lung RNAs influenced by Foxf1 haploinsufficiency. Embryonic Foxf1(+/-) lungs exhibited diminished expression of hepatocyte growth factor receptor c-Met, myosin VI, the transcription factors SP-3, BMI-1, ATF-2, and glucocorticoid receptor, and cell cycle inhibitors p53, p21Cip1, retinoblastoma, and p107. Furthermore, Notch-2 signaling was decreased in embryonic Foxf1(+/-) lungs, as evidenced by significantly reduced levels of the Notch-2 receptor and the Notch-2 downstream target hairy enhancer of split-1. The severity of the Notch-2-signaling defect in 18-day postcoitus Foxf1(+/-) lungs correlated with Foxf1 mRNA levels. Disruption of pulmonary Notch-2 signaling continued in newborn low-Foxf1(+/-) mice, which died of lung hemorrhage and failed to compensate for Foxf1 haploinsufficiency. In contrast, in newborn high-Foxf1(+/-) lungs, Notch-2 signaling was restored to the level found in wild-type mice, which was associated with normal microvascular formation and survival. Foxf1 haploinsufficiency disrupted pulmonary expression of genes in the Notch-2-signaling pathway and resulted in abnormal development of lung microvasculature.

Original languageEnglish (US)
Pages (from-to)L521-L530
JournalAmerican Journal of Physiology - Lung Cellular and Molecular Physiology
Volume286
Issue number3 30-3
DOIs
StatePublished - Mar 2004

Keywords

  • Forkhead box transcription factor
  • Forkhead-related activator-1
  • Hepatocyte nuclear factor/forkhead homolog-8
  • Microarray analysis
  • Notch-2 receptor
  • Winged helix DNA-binding domain

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine
  • Physiology (medical)
  • Cell Biology

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