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|Ref Type||Journal Article|
|Authors||Komeno Y, Kurokawa M, Imai Y, Takeshita M, Matsumura T, Kubo K, Yoshino T, Nishiyama U, Kuwaki T, Osawa T, Ogawa S, Chiba S, Miwa A, Hirai H|
|Title||Identification of Ki23819, a highly potent inhibitor of kinase activity of mutant FLT3 receptor tyrosine kinase.|
|Abstract Text||Constitutively active internal tandem duplication (ITD) in the juxtamembrane domain of Fms-like tyrosine kinase 3 (FLT3), a type III receptor tyrosine kinase, is the most common molecular defect associated with acute myeloid leukemia. Its presence confers a poor outcome in patients with acute myeloid leukemia who receive conventional chemotherapy. FLT3-ITD has therefore been considered to be an attractive molecular target for a novel therapeutic modality. We describe here the identification and characterization of Ki23819 as a novel FLT3 inhibitor. Ki23819 suppressed proliferation and induced apoptosis of FLT3-ITD-expressing human leukemia cell lines. The growth-inhibitory effect of Ki23819 on MV4-11 cells was superior to that of SU11248, another FLT3 inhibitor (IC(50)<1 vs 3-10 nM). Ki23819 inhibited the autophosphorylation of FLT3-ITD more efficiently than that of wild-type FLT3. FLT3-ITD-dependent activation of the downstream signaling proteins ERK and STAT5 was also inhibited within similar concentration ranges. Thus, Ki23819 is a potent in vitro inhibitor of FLT3.|
|Molecular Profile||Treatment Approach|
|Gene Name||Source||Synonyms||Protein Domains||Gene Description||Gene Role|
|Drug Name||Trade Name||Synonyms||Drug Classes||Drug Description|
|Ki23819||FLT3 Inhibitor 57||Ki23819 inhibits both wild-type FLT3 and FLT3 containing activating internal tandem duplications, which may block downstream signaling and induce apoptosis in cancer cells (PMID: 15815726).|
|Gene||Variant||Impact||Protein Effect||Variant Description||Associated with drug Resistance|
|Molecular Profile||Indication/Tumor Type||Response Type||Therapy Name||Approval Status||Evidence Type||Efficacy Evidence||References|
|FLT3 exon 14 ins||acute myeloid leukemia||sensitive||Ki23819||Preclinical - Cell culture||Actionable||In a preclinical study, acute myeloid leukemia cells harboring a FLT3 internal tandem duplication were sensitive to Ki23819 in culture, demonstrating inhibition of autophosphorylation and downstream signaling, and reduced cell proliferation (PMID: 15815726).||15815726|