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Updated: May 15, 2026

Comet Assay to Quantify DNA Damage in FLT3 Mutant-expressing 32D Cells after Exposure to Type I and Type II FLT3 Inhibitors
Published on: October 17, 2025
MR22388, a novel anti-cancer agent with a strong FLT-3 ITD kinase affinity
Christophe Rochais1, Thierry Cresteil, Vittoria Perri
1CERMN, UFR des Sciences Pharmaceutiques, UPRES EA 4258 - FR CNRS 3038 INC3M - SF 4206 ICORE, Université de Caen Basse-Normandie, Bd Becquerel, 14032 Caen cedex, France. christophe.rochais@unicaen.fr
Abstract:
This work describes the study of the mechanism of action and spectrum of activity of MR22388, a novel anti-cancer agent belonging to the tripentone series. MR22388 is highly cytotoxic (within the nanomolar range) against numerous cancer cell lines and studies of its cytotoxicity mechanisms show that it is a weak inhibitor of the polymerization of tubulin and that it induces apoptosis via the MAP kinase pathways. Further MR22388 is a very strong inhibitor of several kinases including the tyrosine kinase FLT3-ITD. FLT3-ITD is a mutated form of the tyrosine kinase receptor (RTK) FLT3, resulting in the constitutive activation of the kinase, occurring in about 25% of normal karyotypes' Acute Myeloid Leukemia (AML) and is linked to a bad prognosis. Consecutively, MR22388 appears as a novel promising anticancer lead agent especially for AML therapy.
Insights
A new anti-cancer drug, MR22388, shows high effectiveness against various cancer cells. It targets specific mutated kinases, offering promise for treating Acute Myeloid Leukemia (AML).
Area of Science:
- Pharmacology
- Molecular Biology
- Oncology
Background:
- Acute Myeloid Leukemia (AML) with FLT3-ITD mutations has a poor prognosis.
- Targeting mutated tyrosine kinases is a key strategy in cancer therapy.
Purpose of the Study:
- To investigate the mechanism of action and activity spectrum of the novel anti-cancer agent MR22388.
- To evaluate MR22388's potential as a therapeutic agent, particularly for AML.
Main Methods:
- Cytotoxicity assays against various cancer cell lines.
- Analysis of tubulin polymerization inhibition.
- Investigation of apoptosis induction via MAP kinase pathways.
- Kinase inhibition assays, focusing on FLT3-ITD.
Main Results:
- MR22388 exhibits high cytotoxicity in the nanomolar range against multiple cancer cell lines.
- It weakly inhibits tubulin polymerization but effectively induces apoptosis through MAP kinase pathways.
- MR22388 strongly inhibits key kinases, including the mutated FLT3-ITD tyrosine kinase.
Conclusions:
- MR22388 demonstrates a promising anti-cancer profile, with potent activity against cancer cell lines.
- Its mechanism involves apoptosis induction and strong inhibition of critical kinases like FLT3-ITD.
- MR22388 represents a potential novel therapeutic lead for AML treatment.
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