Abstract
Following high-dose chemotherapy (HDC) and peripheral blood progenitor cell transplantation (PBPCT), there are profound changes in leukocyte homeostasis and the immune system is compromised. Transplantation of purified CD34+ cells may further compromise immune recovery because the grafts are depleted of mature immune cells. However, a detailed monitoring of immune cell reconstitution has not been done. We monitored blood levels of antigen-presenting cells (APC) and of lymphocytes by multi-color flow cytometry at different times post CD34+ PBPCT. We found a rapid normalization of circulating levels of the antigen-presenting CD11c+ dendritic cells (defined as lineage− HLA-DR+ CD11c+ cells). There was a slight over-representation of lin− DR+ CD11c− cells at day 42 post transplantation suggesting that the composition of the APC population might be affected. Normal levels of total T, B and NK lymphocytes were rapidly achieved but the composition of the T cell population was abnormal. Patients had elevated levels of CD8+ T cells at early times and a persistent reduction in levels of naive CD8+ T cells (CD8+ CD4− CD45RA+ CD27+) and of naive CD4+ T cells (CD4+CD3+ CD8− CD45RA+). Thus, we found a rapid recovery of DC after CD34+ PBPCT but the specific numerical defects in naive T cells are likely to be a major cause of immune dysfunction in the patients. Bone Marrow Transplantation (2000) 25, 1249–1255.
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Acknowledgements
We are thankful for technical assistance from Shelly Schendel and for technical support from the Karmanos Cancer Institute Flow Cytometry Core Facility. We also thank Dr Beth Hill at SySTEMix Inc. for gifts of reagents.
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Galy, A., Rudraraju, S., Baynes, R. et al. Recovery of lymphocyte and dendritic cell subsets after autologous CD34+ cell transplantation. Bone Marrow Transplant 25, 1249–1255 (2000). https://doi.org/10.1038/sj.bmt.1702454
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DOI: https://doi.org/10.1038/sj.bmt.1702454
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