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CD34- blood-derived human endothelial cell progenitors.
1Department of Anatomy and Cell Biology, University of Iowa, Iowa City, Iowa 52242, USA.
Stem Cells (Dayton, Ohio)
|July 21, 2001
Summary
Leukocytes, including monocytes (CD14+ cells), function as angioblasts, contributing to blood vessel repair. Their incorporation into the vasculature requires interaction with CD34+ cells, highlighting cell-cell communication in neovascularization.
Area of Science:
- Hematology
- Vascular Biology
- Cell Biology
Background:
- Leukocytes, specifically angioblasts, are endothelial cell progenitors involved in neovascularization.
- Previous research indicated CD34+ leukocytes differentiate into endothelial cells (EC).
- Recent studies suggest CD14+ leukocytes, typically CD34-, also exhibit angioblast properties.
Purpose of the Study:
- To identify the specific cell types that function as angioblasts.
- To compare the endothelial cell-producing potential of various leukocyte subsets.
- To investigate the role of leukocyte subsets in neovascularization.
Main Methods:
- Comparative analysis of CD34+, CD34-, CD34- CD14+, and CD34- CD14- cells for EC production.
- In vitro cell culture to assess EC-like phenotype and antigen expression.
- In vivo studies using mouse ischemic limb models to track cell incorporation into vasculature.
Main Results:
- Monocyte-enriched (CD34- CD14+) cells can adopt an EC-like phenotype in culture, expressing dendritic cell antigens.
- Angioblasts are more prevalent in peripheral blood than previously estimated.
- CD34- and CD34- CD14+ cells incorporate into the endothelium of ischemic mouse limbs but require co-injection with CD34+ cells.
Conclusions:
- Monocytes can differentiate into macrophages, dendritic cells, or ECs based on environmental signals.
- Leukocyte-leukocyte interactions, particularly involving CD34+ cells, are crucial for angioblast function in vivo.
- Angioblasts are a more abundant circulating cell population than previously recognized.