FOXO1 regulates developmental lymphangiogenesis by upregulating CXCR4 in the mouse-tail dermis

Development. 2020 Jan 17;147(2):dev181545. doi: 10.1242/dev.181545.


Lymphangiogenesis plays important roles in normal fetal development and postnatal growth. However, its molecular regulation remains unclear. Here, we have examined the function of forkhead box protein O1 (FOXO1) transcription factor, a known angiogenic factor, in developmental dermal lymphangiogenesis using endothelial cell-specific FOXO1-deficient mice. FOXO1-deficient mice showed disconnected and dilated lymphatic vessels accompanied with increased proliferation and decreased apoptosis in the lymphatic capillaries. Comprehensive DNA microarray analysis of the causes of in vivo phenotypes in FOXO1-deficient mice revealed that the gene encoding C-X-C chemokine receptor 4 (CXCR4) was the most drastically downregulated in FOXO1-deficient primary lymphatic endothelial cells (LECs). CXCR4 was expressed in developing dermal lymphatic capillaries in wild-type mice but not in FOXO1-deficient dermal lymphatic capillaries. Furthermore, FOXO1 suppression impaired migration toward the exogenous CXCR4 ligand, C-X-C chemokine ligand 12 (CXCL12), and coordinated proliferation in LECs. These results suggest that FOXO1 serves an essential role in normal developmental lymphangiogenesis by promoting LEC migration toward CXCL12 and by regulating their proliferative activity. This study provides valuable insights into the molecular mechanisms underlying developmental lymphangiogenesis.

Keywords: C-X-C chemokine ligand 12 (CXCL-12); C-X-C chemokine receptor type 4 (CXCR-4); Chemokine; FOXO; Lymphangiogenesis; Tail dermis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Animals, Newborn
  • Antigens, CD / metabolism
  • Apoptosis
  • Base Sequence
  • Cadherins / metabolism
  • Cell Death
  • Cell Proliferation
  • Chemokine CXCL12 / metabolism
  • Dermis / metabolism*
  • Endothelial Cells / cytology
  • Endothelial Cells / metabolism
  • Enhancer Elements, Genetic / genetics
  • Forkhead Box Protein O1 / metabolism*
  • Gene Deletion
  • Gene Expression Regulation, Developmental*
  • Integrases / metabolism
  • Lymphangiogenesis / genetics*
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Models, Biological
  • Promoter Regions, Genetic / genetics
  • Protein Binding
  • Receptors, CXCR4 / genetics*
  • Receptors, CXCR4 / metabolism
  • Tail / metabolism*
  • Up-Regulation / genetics*


  • Antigens, CD
  • Cadherins
  • Chemokine CXCL12
  • Forkhead Box Protein O1
  • Foxo1 protein, mouse
  • Receptors, CXCR4
  • cadherin 5
  • Cre recombinase
  • Integrases