Abstract
Umbilical cord blood (UCB) progenitor cells have been demonstrated to possess significant advantages over bone marrow (BM), in terms of proliferative capacity and immunologic reactivity. Therefore, UCB has been recently considered an attractive potential alternative to BM as a source of hematopoietic progenitor cells for clinical applications. Since several programs throughout the world are currently evaluating the feasibility of large-scale UCB banking for unrelated transplants, it was the aim of this study to evaluate whether cryopreservation procedures might heavily impair the clonogenic capacity, the feasibility of CD34+ selection and the ex vivo expansion potential of UCB progenitor cells. UCB samples were collected and cryopreserved as unseparated (n = 21) or mononuclear (MNC) cells (n = 15) within 12 h from delivery, and evaluated for viability, immunophenotype, cell and progenitor numbers after a minimum stay in liquid nitrogen of 6 months (range 6-14 months). Viability was always > 97% and no statistically significant difference was detected by flow cytometric analysis. Clonogenic recovery from unseparated cells was 80-87% for HPP-CFC, CFU-GEMM, BFU-E and CFU-GM, and from MNC cells ranged from 82 to 91% for LTC-IC, CFU...Continue Reading
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