Title: Novel bis(1H-indol-2-yl)methanones as potent inhibitors of FLT3 and platelet-derived growth factor receptor tyrosine kinase.

Abstract: FLT3 receptor tyrosine kinase is aberrantly active in many cases of acute myeloid leukemia (AML). Recently, bis(1H-indol-2-yl)methanones were found to inhibit FLT3 and PDGFR kinases. To optimize FLT3 activity and selectivity, 35 novel derivatives were synthesized and tested for inhibition of FLT3 and PDGFR autophosphorylation. The most potent FLT3 inhibitors 98 and 102 show IC50 values of 0.06 and 0.04 microM, respectively, and 1 order of magnitude lower PDGFR inhibiting activity. The derivatives 76 and 82 are 20- to 40-fold PDGFR selective. Docking at the recent FLT3 structure suggests a bidentate binding mode with the backbone of Cys-694. Activity and selectivity can be related to interactions of one indole moiety with a hydrophobic pocket including Phe-691, the only different binding site residue (PDGFR Thr-681). Compound 102 inhibited the proliferation of 32D cells expressing wildtype FLT3 or FLT3-ITD similarly as FLT3 autophosphorylation, and induced apoptosis in primary AML patient blasts.
(PMID: 16722630)

Putative Target:

ChEMBL Target ID: 12670
Target Type: SINGLE PROTEIN
Pref Name: Tyrosine-protein kinase receptor FLT3
Description: Receptor-type tyrosine-protein kinase FLT3
Organism: Homo sapiens
Tax ID: 9606
Confidence: Homologous single protein target assigned
Relationship Type: Homologous protein target assigned
ChEMBL target type: Target is a single protein chain

ChEMBL Assay Type: Functional

ChEMBL Assay Data Source: Scientific Literature