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Effect of tresperimus on in vitro human cord blood CD34+ cell differentiation

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image of Haematologia

Tresperimus, an analogue of 15-deoxyspergualin (15-DSG), is immunosuppressive and prevents lethal graft-versus-host disease following allogeneic bone marrow transplantation in mice. Here, we present an in vitro dose response study examining the ability of tresperimus to support clonogenesis in cultured CD34+ cord blood stem cells. Our findings revealed that only the lowest dose examined, 0.5 μg tresperimus/ml, supports normal myelopoiesis, erythropoiesis and megakaryopoiesis. Greater concentrations of the drug induced dose-dependent inhibition of clonogenesis. This latter effect was not due to apoptosis and was reversible by drug withdrawal. We conclude that tresperimus at 0.5 μg/ml supports the clonogenic potential of cord blood CD34+ cells. Dose-dependent inhibition of clonogenesis was completely reversible following drug withdrawal. These results may be of clinical interest as tresperimus is currently used in phase I-III studies for the prevention of graft versus host disease in recipients of allogeneic bone marrow.


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