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Engraftment potential of peripheral and cord blood stem cells evaluated by a long-term culture system
Insights
Long-term culture colony-forming cells (LTC-CFC) predict platelet recovery after stem cell transplantation. Cord blood stem cells show greater transplantation potential than peripheral blood stem cells.
Area of Science:
- Hematology
- Transplantation Immunology
- Stem Cell Biology
Background:
- Assessing hematopoietic stem cell graft quality is crucial for predicting patient recovery post-transplantation.
- Peripheral blood stem cell transplantation (PBSCT) is a common procedure, but understanding engraftment kinetics is vital.
- Cord blood stem cells are an alternative source, but their comparative potential needs further elucidation.
Purpose of the Study:
- To evaluate colony-forming units-granulocyte/macrophage (CFU-GM) and long-term culture colony-forming cells (LTC-CFC) as indicators of hematopoietic recovery after autologous PBSCT.
- To compare the transplantation potential of cord blood stem cells versus peripheral blood stem cells.
Main Methods:
- Nine children undergoing autologous PBSCT were analyzed.
- Infused grafts were quantified for CFU-GM and LTC-CFC.
- Hematopoietic recovery (absolute granulocyte count and platelet count) was monitored post-transplantation.
- Comparative analysis of stem cell content in cord blood versus peripheral blood.
Main Results:
- Higher infused CFU-GM/kg correlated with faster achievement of an absolute granulocyte count (AGC) of 0.5 x 10(9)/L.
- Infused LTC-CFC/kg showed a significant correlation with platelet recovery speed and later AGC recovery (2 x 10(9)/L).
- Cord blood mononuclear cells contained 2.5-fold more LTC-CFC and 2-fold more CFU-GM than peripheral blood cells.
Conclusions:
- LTC-CFC assay may better reflect the kinetics of immature progenitor cells for stable engraftment after ablative therapy.
- Cord blood exhibits superior stem cell content per mononuclear cell, suggesting its advantage as a stem cell source for transplantation.
Abstract:
The experiment was performed in an attempt to seek a suitable indicator of allogeneic transplantation using cord blood cells. The number of colony-forming cells (CFC) recovered after 5 weeks of culture represents that of primitive progenitors present in the initiating cell population. In this study of nine children who underwent autologous peripheral blood stem cell transplantation (PBSCT), we measured the amount of colony-forming units-granulocyte/macrophage (CFU-GM) and total CFC output after 5 weeks in long-term culture (LTC-CFC) contained in the infused grafts and compared them to the speed of hematopoietic recovery after marrow ablation. In this patient population, we found a significant negative correlation between the number of infused CFU-GM/kg body weight and the time to achieve an absolute granulocyte count (AGC) of 0.5 x 10(9)/L (r = -0.867, p < 0.01), but not with the time to achieve a platelet count of 50 x 10(9)/L (r = -0.700, p = 0.05). Although the number of infused LTC-CFC/kg did not correlate with the early phase of granulocyte recovery, a significant correlation was observed with platelet recovery speed (r = -0.930, p < 0.01) and with the time to regain an absolute granulocyte count of 2 x 10(9)/L after the nadir of the transient decrease in the number of AGC, which occurred 3 to 7 weeks following PBSCT (r = 0.967, p < 0.01). On the other hand, CFU-GM/kg showed no significant correlation with this late engraftment speed. Thus, LTC assay may reflect the kinetics of immature progenitor cells which are capable of reconstituting stable hematopoiesis after marrow ablative therapy. The data were then used in a comparative analysis of the transplantation potential of peripheral vs. cord blood stem cells. The numbers of LTC-CFC and CFU-GM per mononuclear cell (MNC) from cord blood were 2.5-fold and two-fold greater than those from peripheral blood cells, respectively. These results suggest the advantage of cord blood as an additional stem cell source in transplantation.