Related Experiment Videos
Cell adhesion molecules in cord blood hematopoietic progenitors
F Timeus1, N Crescenzio, D Marranca
1Dept of Ped Hematology/Oncology, University of Turin, Torino, Italy.
Bone Marrow Transplantation
|August 26, 1998
Summary
Cord blood stem cells show higher expression of CD11a and CD62L adhesion molecules compared to bone marrow, potentially improving homing and engraftment. Cytokines boost CD62L in more mature cells.
Area of Science:
- Hematology
- Immunology
- Stem Cell Biology
Background:
- Hematopoietic stem cells (HSCs) reside in bone marrow (BM) and cord blood (CB).
- Cell adhesion molecules (CAMs) mediate stem cell trafficking and engraftment.
- CD34+/CD38- cells represent primitive HSCs, while CD34+/CD38+ cells are more differentiated progenitors.
Purpose of the Study:
- To compare the expression of specific cell adhesion molecules on HSCs and progenitors from CB and BM.
- To investigate the impact of cytokine stimulation on CAM expression in these cell populations.
Main Methods:
- Flow cytometry was used to analyze cell surface marker expression.
- Cord blood and bone marrow CD34+ cells were isolated and subdivided into CD38+ and CD38- fractions.
- Cells were cultured with cytokines to assess changes in adhesion molecule expression.
Main Results:
- CD11a and CD62L showed higher expression on cord blood CD34+/CD38- cells compared to bone marrow counterparts.
- This suggests a potential homing and engraftment advantage for CB-derived primitive HSCs.
- Cytokine treatment upregulated CD62L expression predominantly on the more differentiated CD34+/CD38+ cells from both CB and BM.
Conclusions:
- Cord blood CD34+/CD38- cells possess distinct adhesion molecule profiles potentially favoring superior engraftment.
- Cytokine-induced modulation of CD62L is differentiation-dependent.
- Findings contribute to understanding stem cell mobilization and engraftment dynamics.