In vitro and in vivo studies showed that LR-PCs can be stored for up to 7 days with excellent clinical results, provided that they are routinely screened for bacterial contamination.
Summary.A simple and sensitive flow cytometric method is presented for the quantitation of erythrocyte subpopulations. Cells were indirectly labelled using human antisera (mostly crude) and fluorescein isothiocyanate (FITC)-conjugated anti-human IgG F ab . The method was evaluated by analysing artificial mixtures of blood group antigens A, B, D, E, c, K and Fy a . Intra-assay coefficients of variation were found to be 7 . 2% for 1% D-positive mixtures and 2 . 2% for 10% D-positive mixtures; the inter-assay coefficients of variation were 9 . 5% and 6 . 0% respectively. The sensitivity of the method was found to be 0 . 31%. The method has shown to be suitable for the routine follow-up of patients after allogeneic bone marrow transplantation (BMT).
Summary:Autologous stem cell transplantation using unprocessed, G-CSF-mobilized whole blood (WB) is a simple, cost-reducing procedure and supports high-dose chemotherapy regimens not exceeding 72 h. Thereafter, clonogenic capacity rapidly decreases if routine anticoagulants are used for storage. In order to increase clinical applicability, we investigated the requirements for optimal preservation of unprocessed WB for 7 days. During storage at 22؇C in CPDA-1, a decrease in pH was noted, which was at least partially responsible for the low recovery of clonogenic cells. Subsequently, WB cells were stored in various cell culture media (RPMI 1640, ␣-MEM, X-VIVO15, CellGro SCGM and Leibovitz's L15 medium) containing either serum, serum-free substitutes or no additives. Leibovitz's L15 showed significantly better CFU-GM recoveries than the other media. Using a calcium-free modification of L15 medium (added 3:10 to WB), 94 ؎ 24% of CD34 ؉ cells, 41 ؎ 14% of BFU-E, 56 ؎ 17% CFU-GM and 90 ؎ 14% of LTC-IC were preserved during storage for 7 days at 22؇C. Storage at 4؇C was also feasible, but showed less optimal recoveries of 52 ؎ 29% (CD34), 32 ؎ 10% (BFU-E), 13 ؎ 7% (CFU-GM) and 58 ؎ 9% (LTC-IC). The expression of CD38, Thy-1, c-kit, AC133, L-selectin and CXCR4 on CD34-positive cells remained unchanged. In conclusion, a modified Leibovitz's L15 medium better meets the metabolic requirements of a high-density cell culture and allows safe storage of G-CSF mobilized WB for at least 7 days. The results encourage further exploration of WB transplants stored for 7 days for clinical use. Bone Marrow Transplantation (2001) 28, 145-155.
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