Abstract:
:The fms-related tyrosine kinase 3 (FLT3) receptor has been extensively studied over the past two decades with regard to oncogenic alterations that do not only serve as prognostic markers but also as therapeutic targets in acute myeloid leukemia (AML). Internal tandem duplications (ITDs) became of special interest in this setting as they are associated with unfavorable prognosis. Because of sequence-dependent protein conformational changes FLT3-ITD tends to autophosphorylate and displays a constitutive intracellular localization. Here, we analyzed the effect of tyrosine kinase inhibitors (TKIs) on the localization of the FLT3 receptor and its mutants. TKI treatment increased the surface expression through upregulation of FLT3 and glycosylation of FLT3-ITD and FLT3-D835Y mutants. In T cell-mediated cytotoxicity (TCMC) assays, using a bispecific FLT3 × CD3 antibody construct, the combination with TKI treatment increased TCMC in the FLT3-ITD-positive AML cell lines MOLM-13 and MV4-11, patient-derived xenograft cells and primary patient samples. Our findings provide the basis for rational combination of TKI and FLT3-directed immunotherapy with potential benefit for FLT3-ITD-positive AML patients.
journal_name
Leukemiajournal_title
Leukemiaauthors
Reiter K,Polzer H,Krupka C,Maiser A,Vick B,Rothenberg-Thurley M,Metzeler KH,Dörfel D,Salih HR,Jung G,Nößner E,Jeremias I,Hiddemann W,Leonhardt H,Spiekermann K,Subklewe M,Greif PAdoi
10.1038/leu.2017.257subject
Has Abstractpub_date
2018-02-01 00:00:00pages
313-322issue
2eissn
0887-6924issn
1476-5551pii
leu2017257journal_volume
32pub_type
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