title: Recovery of CFU-GM after freezing of normal human bone marrow: effect of three dilution techniques after thawing.
abstract: In the cryopreservation procedures intended for autotransplantation of human bone marrow a controversial point is represented by the methods of reconstruction of the cellular suspension after thawing and before infusion into the patient. To evaluate how the dilution rate after thawing affects bone marrow viability, we cryopreserved the bone marrow from 16 hematologically normal patients in DMSO at a concentration of 10%. After thawing, the cells were diluted according to three different techniques and their viability was tested by the growth of CFU-GM in methylcellulose. The average recovery of CFU-GM, in comparison with that of fresh cells, was satisfactory and not affected by the type of dilution. In conclusion, if we accept that the resistance to osmotic stress due to the cryoprotectant is similar for stem cells and CFU-GM, we can maintain that a slow, gradual dilution is not a necessary condition to assume the staminality of bone marrow designed for autotransplantation.
mesh_terms: D001853:Bone Marrow / Q000187:drug effects; D001854:Bone Marrow Cells; D002470:Cell Survival; D003114:Colony-Forming Units Assay; D003451:Cryoprotective Agents / Q000494:pharmacology; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D005615:Freezing; D006801:Humans; D014021:Tissue Preservation / Q000379:methods*
chemical_list: D003451:Cryoprotective Agents; D004121:Dimethyl Sulfoxide