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Cell adhesion molecule expression in cord blood CD34+ cells
F Timeus1, N Crescenzio, G Basso
1Department of Pediatric Hematology-Oncology, University of Torino, Italy.
Stem Cells (Dayton, Ohio)
|April 29, 1998
Summary
Hematopoietic progenitor cells (HPCs) from cord blood (CB) show greater expression of certain cell adhesion molecules (CAMs) than bone marrow (BM) HPCs, suggesting better homing potential. Cytokine exposure enhances CAM expression in differentiated CB HPCs.
Area of Science:
- Hematology
- Cell Biology
- Immunology
Background:
- Hematopoietic progenitor cell (HPC) functions like self-renewal, proliferation, differentiation, homing, and mobilization are intricately regulated by the bone marrow (BM) microenvironment.
- Cell adhesion molecules (CAMs) on HPCs and stromal cells are crucial for these regulatory mechanisms.
Purpose of the Study:
- To compare CAM expression in cord blood (CB) and BM HPC subsets.
- To investigate the effect of short-term cytokine exposure on L-selectin expression in HPCs.
Main Methods:
- Three-color cytofluorometric analysis was employed to assess CAM expression.
- The study analyzed unseparated samples to prevent bias from CD34 selection.
- HPCs were exposed to various cytokines for 4-24 hours to evaluate changes in L-selectin expression.
Main Results:
- CAMs were highly expressed in both CB and BM CD34+CD38+ cells, with higher L-selectin, H-CAM, and LFA-1 in BM HPCs.
- More immature CB HPC subsets (CD34+/CD38-/L-selectin+ and CD34+/CD38-/LFA1+) were significantly larger than in BM.
- Cytokine exposure increased L-selectin expression in more differentiated CB CD34+/CD38+ HPCs while reducing it in less differentiated CD34+/CD38- HPCs.
Conclusions:
- The distinct CAM expression profiles suggest a potential homing and engraftment advantage for undifferentiated CB HPCs over BM HPCs.
- Short-term cytokine treatment enhances L-selectin expression in differentiated CB HPCs, potentially improving their homing capacity in transplantation.