Abstract
The purified CD34+ cell fraction has been used for hematopoietic stem cell transplantation since they were demonstrated to have long-term reconstituting ability. Therefore, the potential effects of CD34− stem cells on the clinical course have been a major concern in recipients of CD34+-selected transplantation. To address this concern, we used an in vitro assay to determine whether transplant recipients have CD34−precursor population. Lin−CD34− cells were isolated from bone marrow cells in 11 transplant recipients including four CD34-selected transplantations, six standard bone marrow transplantations, and one T cell-depleted marrow transplantation. The frequency of the Lin−CD34− population in four CD34-enriched transplantation recipients was not different from those of normal donors or recipients of other modes of transplantation: 0.96 ± 1.01% (mean ± s.d., n = 4), 0.45 ± 0.16% (n = 6), and 0.66 ± 0.59% (n = 7), respectively. However, the Lin−CD34−population obtained from the recipients of CD34-enriched transplantation acquired neither CD34 expression nor colony-forming activity after 7 days of culture, whereas the cells from all the normal individuals and standard BMT recipients were able to differentiate into CD34+ cells accompanied by the emergence of colony-forming activity. We conclude that recipients of CD34-enriched transplantation appear to have defects in their CD34− precursor population. The clinical significance of these defects will be determined in a life-long follow-up of these patients. Bone Marrow Transplantation (2001) 28, 587–595.
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Acknowledgements
We thank Hideyuki Matsuzawa for his excellent technical assistance, Shizuko Imai for secretarial work and the members of Tokai CBSC Study Group for their assistance. The authors also wish to thank KIRIN Brewery Co. Ltd. for supplying various growth factors. This study was supported by The Japan Society for the Promotion of Science (JSPS) grant no. JSPS-RFTF97 I 00201 and a research grant of the science Frontier Program from the Ministry of Education, Science, Sports and Culture of Japan.
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Kato, S., Ando, K., Nakamura, Y. et al. Absence of a CD34− hematopoietic precursor population in recipients of CD34+ stem cell transplantation. Bone Marrow Transplant 28, 587–595 (2001). https://doi.org/10.1038/sj.bmt.1703186
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DOI: https://doi.org/10.1038/sj.bmt.1703186
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