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Development of the avian lymphatic system.

J Wilting1, M Papoutsi, K Othman-Hassan

  • 1Anatomisches Institut der Albert-Ludwigs-Universität Freiburg, 79104 Freiburg, Germany. wilting@uni-freiburg.de

Microscopy Research and Technique
|October 12, 2001
PubMed
Summary
This summary is machine-generated.

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The embryonic lymphatic system originates from both lymph sacs and mesenchymal lymphangioblasts. These lymphangioblasts, identified by Prox1 expression, migrate from the somites to form limb lymphatics.

Area of Science:

  • Developmental Biology
  • Vascular Biology
  • Embryology

Background:

  • Recent discoveries of specific lymphatic endothelium markers allow for detailed investigation into the embryonic origin of lymphatic vessels.
  • Understanding lymphatic development is crucial for addressing lymphatic-related disorders.

Purpose of the Study:

  • To review studies on lymphatic system development in chick and quail embryos.
  • To elucidate the origins and developmental pathways of lymphatic endothelial cells.

Main Methods:

  • Utilized Bromodeoxyuridine (BrdU) labeling to assess endothelial cell proliferation in lymph sacs.
  • Examined the expression of vascular endothelial growth factor (VEGF) receptors and ligands (VEGF-C).
  • Investigated the expression of the homeobox gene Prox1 in lymphatic versus blood vascular endothelial cells.

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Main Results:

  • Lymphatic endothelium arises from two distinct sources: embryonic lymph sacs and mesenchymal lymphangioblasts.
  • Lymphangioblasts integrate into lymph sacs and are present in the mesoderm prior to lymph sac development.
  • Prox1 is a specific marker for lymphatic endothelial cells throughout development, and is expressed by lymphangioblasts.
  • VEGF-C is widely expressed, with high levels near major blood vessels, suggesting a role in lymphatic growth.

Conclusions:

  • The lymphatic system develops from both intrinsic lymph sacs and extrinsic migratory lymphangioblasts.
  • Prox1 serves as a reliable marker for identifying lymphatic endothelial cells and their precursors.
  • VEGF signaling pathways are integral to lymphatic vessel development and growth.