Related Experiment Videos
Vascular wall resident progenitor cells: a source for postnatal vasculogenesis.
Elvin Zengin1, Fariba Chalajour, Ursula M Gehling
1Center of Experimental Medicine, Institute of Anatomy I, University Hospital Hamburg-Eppendorf, Hamburg, Germany.
Development (Cambridge, England)
|March 10, 2006
Summary
Scientists discovered a unique zone in adult human blood vessel walls containing stem cells. These cells can form new blood vessels, aiding tumor growth and immune responses.
Area of Science:
- Vascular Biology
- Stem Cell Research
- Immunology
Background:
- Endothelial precursor cells (EPCs) are crucial for blood vessel formation.
- The precise location and function of EPCs within the adult vascular wall remain incompletely understood.
Purpose of the Study:
- To identify and characterize a distinct progenitor cell population within the adult human vascular wall.
- To investigate the potential of these cells to differentiate and contribute to neovascularization, including tumor vascularization.
Main Methods:
- Human internal thoracic artery (HITA) ring assays were performed.
- Immunophenotyping of vascular wall cells using markers such as CD34, CD31, VEGFR2, TIE2, and CD45.
- Analysis of capillary sprout formation and expression of endothelial markers (CEACAM1, VE-cadherin, occludin).
Main Results:
- A distinct zone between the smooth muscle and adventitia of the human vascular wall contains CD34+ progenitor cells.
- These cells express VEGFR2 and TIE2, with limited CD45 expression.
- HITA-derived CD34+ cells formed capillary sprouts ex vivo and were recruited by tumor cells, forming functional vessels.
Conclusions:
- A 'vasculogenic zone' exists in the adult human vascular wall, harboring progenitor cells.
- These resident vascular progenitor cells can contribute to postnatal vasculogenesis, tumor vascularization, and local immune responses.