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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

An immunotoxin with therapeutic potential in T cell leukemia: WT1-ricin A.

A conjugate of the monoclonal antibody WT1 and ricin A-chain was studied for its suitability for purging marrow of leukemic T cells for autologous transplantation in T cell acute lymphocytic leukemia (T-ALL). The conjugate was powerfully cytotoxic to the human T-ALL cell line, GH1, which expresses the WT1 antigen at a high density. Treatment of the cells with the conjugate at 10(-11) M reduced their rate of protein synthesis by 50%, and the inclusion of 6 mM ammonium chloride in the cultures enhanced the potency of cytotoxic effect by 10-100-fold. Clonogenic assays indicated that less than 0.1% of GH1 cells survived 3-hr exposure to the conjugate in ammonium chloride. WT1 alone did not react with multipotent (CFU-GEMM) hematopoietic progenitors in normal human bone marrow, as measured by fluorescence-activated cell sorting. Under conditions giving maximal killing of GH1 cells, there was no toxicity to multipotential progenitors in normal human marrow.[1]


  1. An immunotoxin with therapeutic potential in T cell leukemia: WT1-ricin A. Myers, C.D., Thorpe, P.E., Ross, W.C., Cumber, A.J., Katz, F.E., Tax, W., Greaves, M.F. Blood (1984) [Pubmed]
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