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Defective valves and abnormal mural cell recruitment underlie lymphatic vascular failure in lymphedema distichiasis

Tatiana V Petrova1, Terhi Karpanen, Camilla Norrmén

  • 1Molecular/Cancer Biology Laboratory and Ludwig Institute for Cancer Research, Biomedicum Helsinki and Helsinki University Central Hospital, University of Helsinki, Haartmaninkatu 8, P.O.B. 63, 00014 Helsinki, Finland.

Nature Medicine
|August 24, 2004
PubMed

Insights

Forkhead transcription factor FOXC2 is crucial for lymphatic valve formation and a pericyte-free capillary network. Mutations in FOXC2 lead to lymphatic dysfunction and lymphedema-distichiasis (LD).

Area of Science:

  • Vascular biology
  • Developmental biology
  • Genetics

Background:

  • Lymphatic vessels are vital for fluid balance and immune function.
  • Lymphedema-distichiasis (LD) is a condition characterized by lymphatic system dysfunction.
  • Mutations in the forkhead transcription factor FOXC2 are implicated in LD pathogenesis.

Purpose of the Study:

  • To investigate the role of FOXC2 in lymphatic vessel development and function.
  • To elucidate the mechanisms underlying lymphatic abnormalities in LD.
  • To explore the interaction between FOXC2 and VEGFR3 in lymphatic morphogenesis.

Main Methods:

  • Analysis of Foxc2 knockout mice (Foxc2(-/-)) to study lymphatic vascular patterning and function.
  • Histological examination of lymphatic vessels to assess pericyte and smooth muscle cell investment.
  • Genetic analysis of individuals with LD and relevant mouse models.

Main Results:

  • Foxc2(-/-) mice exhibited abnormal lymphatic patterning, absent valves, and impaired lymphatic drainage.
  • Increased pericyte investment was observed in lymphatic vessels of Foxc2(-/-) mice.
  • Both LD patients and Foxc2 heterozygous mice showed increased smooth muscle cell coverage on skin lymphatic vessels, often in conjunction with altered VEGFR3 signaling.

Conclusions:

  • FOXC2 is essential for lymphatic valve development and the formation of a pericyte-free lymphatic capillary network.
  • FOXC2 cooperates with VEGFR3 in establishing the pericyte-free lymphatic capillary network.
  • Abnormal pericyte-endothelial cell interactions and lymphatic valve defects are key factors in the pathogenesis of LD.

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