UTILITY OF THE ATTACHED SAMPLE BLOOD FOR QUALITY CONTROL OF LONG-TERM CRYOPRESERVED UMBILICAL CORD BLOOD FOR HEMATOPOIETIC CELL TRANSPLANTATION

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  • 造血細胞移植用長期間保存臍帯血の品質に関する付属検体血の有用性の検討
  • ゾウケツ サイボウ イショクヨウ チョウキカン ホゾン サイタイケツ ノ ヒンシツ ニ カンスル フゾクケンタイ チ ノ ユウヨウセイ ノ ケントウ

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Although CB units, many of which have been cryopreserved for long-term, are available for hematopoietic cell transplantation (HCT), it is not clear whether long-term cryopreserved CB tubes are representative of those CB units. The aim of this study was to evaluate whether long-term cryopreserved CB tubes are representative of those CB units; 110 CB units and CB tubes cryopreserved for more than 10 years, respectively, were analyzed. The CB units and CB tubes were thawed, and the number of total nucleated cells (TNCs), CD34＋ cells, viability rates, colony-forming units-granulocyte/macrophage (CFU-GM) cell counts, CD34＋CD38－ cells, and CD34＋CXCR4＋ cells were examined. The number of TNCs, CD34＋ cells, viability rates and CFU-GMs were 5.61±1.91×108, 1.23±0.91×106, 86.73±7.87%, 1.46±0.89×105 for the CB units and 4.72±1.85×108, 0.91±0.72×106, 72.48±23.4%, 0.55±0.62×105 for the CB tubes (p＜0.001, p＝0.0011, p＜0.001 and p＜0.001, respectively). All of those were significantly lower for the CB tubes than those of CB units. Interestingly, CFU-GMs were not determined in 42 (38.2%) CB tubes. Therefore each data from the CB units were compared between the group of CFU-GM detected and non-detected in the CB tubes. There were no significant differences between the groups. There was a positive relationship between the CB tubes and the CB units in the number of CD34＋ cells (r ＝ 0.747). Also there was a positive relationship between the number of CD34＋ cells in the CB tubes and CFU-GMs in the CB units (r＝0.345). These results indicate that the quality of the long-term cryopreserved CB tubes was decreased. In conclusion, the number of CD34＋ cells in the CB tubes predicts the quality of the CB units and may be used as a source for final quality control of the CB unit before transplantation.

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