Abstract:
:Diseases with clonal hematopoiesis such as myelodysplastic syndrome and acute myeloid leukemia have high rates of relapse. Only a small subset of acute myeloid leukemia patients are cured with chemotherapy alone. Relapse in these diseases occurs at least in part due to the failure to eradicate leukemic stem cells or hematopoietic stem cells in myelodysplastic syndrome. CD123, the alpha chain of the interleukin-3 receptor heterodimer, is expressed on the majority of leukemic stem cells and myelodysplastic syndrome hematopoietic stem cells and in 80% of acute myeloid leukemia. Here, we report indiscriminate killing of CD123+ normal and acute myeloid leukemia / myelodysplastic syndrome cells by SL-401, a diphtheria toxin interleukin-3 fusion protein. SL-401 induced cytotoxicity of CD123+ primary cells/blasts from acute myeloid leukemia and myelodysplastic syndrome patients but not CD123- lymphoid cells. Importantly, SL-401 was highly active even in cells expressing low levels of CD123, with minimal effect on modulation of the CD123 target in acute myeloid leukemia. SL-401 significantly prolonged survival of leukemic mice in acute myeloid leukemia patient-derived xenograft mouse models. In addition to primary samples, studies on normal cord blood and healthy marrow show that SL-401 has activity against normal hematopoietic progenitors. These findings indicate potential use of SL-401 as a "bridge-to-transplant" before allogeneic hematopoietic cell transplantation in acute myeloid leukemia / myelodysplastic syndrome patients.
journal_name
Haematologicajournal_title
Haematologicaauthors
Mani R,Goswami S,Gopalakrishnan B,Ramaswamy R,Wasmuth R,Tran M,Mo X,Gordon A,Bucci D,Lucas DM,Mims A,Brooks C,Dorrance A,Walker A,Blum W,Byrd JC,Lozanski G,Vasu S,Muthusamy Ndoi
10.3324/haematol.2018.188193subject
Has Abstractpub_date
2018-08-01 00:00:00pages
1288-1297issue
8eissn
0390-6078issn
1592-8721pii
haematol.2018.188193journal_volume
103pub_type
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