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Published on: September 18, 2013
Design, Synthesis, and Anti-Leukemic Evaluation of a Series of Dianilinopyrimidines by Regulating the Ras/Raf/MEK/ERK
Chaoyan Wang1,2,3, Bo Wang1,2,4, Yu Mou1,2,3
1State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang 550014, China.
Abstract:
Although the long-term survival rate for leukemia has made significant progress over the years with the development of chemotherapeutics, patients still suffer from relapse, leading to an unsatisfactory outcome. To discover the new effective anti-leukemia compounds, we synthesized a series of dianilinopyrimidines and evaluated the anti-leukemia activities of those compounds by using leukemia cell lines (HEL, Jurkat, and K562). The results showed that the dianilinopyrimidine analog H-120 predominantly displayed the highest cytotoxic potential in HEL cells. It remarkably induced apoptosis of HEL cells by activating the apoptosis-related proteins (cleaved caspase-3, cleaved caspase-9 and cleaved poly ADP-ribose polymerase (PARP)), increasing apoptosis protein Bad expression, and decreasing the expression of anti-apoptotic proteins (Bcl-2 and Bcl-xL). Furthermore, it induced cell cycle arrest in G2/M; concomitantly, we observed the activation of p53 and a reduction in phosphorylated cell division cycle 25C (p-CDC25C) / Cyclin B1 levels in treated cells. Additionally, the mechanism study revealed that H-120 decreased these phosphorylated signal transducers and activators of transcription 3, rat sarcoma, phosphorylated cellular RAF proto-oncogene serine / threonine kinase, phosphorylated mitogen-activated protein kinase kinase, phosphorylated extracellular signal-regulated kinase, and cellular myelocytomatosis oncogene (p-STAT3, Ras, p-C-Raf, p-MEK, p-MRK, and c-Myc) protein levels in HEL cells. Using the cytoplasmic and nuclear proteins isolation assay, we found for the first time that H-120 can inhibit the activation of STAT3 and c-Myc and block STAT3 phosphorylation and dimerization. Moreover, H-120 treatment effectively inhibited the disease progression of erythroleukemia mice by promoting erythroid differentiation into the maturation of erythrocytes and activating the immune cells. Significantly, H-120 also improved liver function in erythroleukemia mice. Therefore, H-120 may be a potential chemotherapeutic drug for leukemia patients.
Insights
A novel compound, H-120, effectively combats leukemia by inducing cancer cell death and halting cell cycle progression. This dianilinopyrimidine analog shows promise as a potential chemotherapeutic agent for leukemia treatment.
Area of Science:
- Oncology
- Molecular Biology
- Drug Discovery
Background:
- Leukemia relapse remains a significant challenge despite advancements in chemotherapy.
- There is a critical need for novel anti-leukemia compounds to improve patient outcomes.
Purpose of the Study:
- To synthesize and evaluate novel dianilinopyrimidine analogs for anti-leukemia activity.
- To investigate the mechanism of action of the most potent analog, H-120, in leukemia cells.
Main Methods:
- Synthesis of a series of dianilinopyrimidines.
- In vitro evaluation of anti-leukemia activity using HEL, Jurkat, and K562 cell lines.
- Apoptosis assays, cell cycle analysis, Western blotting, and protein isolation assays.
- In vivo study in erythroleukemia mouse models.
Main Results:
- Dianilinopyrimidine analog H-120 exhibited significant cytotoxic potential against HEL cells.
- H-120 induced apoptosis by modulating key apoptosis-related proteins and cell cycle arrest at G2/M.
- H-120 inhibited STAT3 and c-Myc activation, phosphorylation, and dimerization.
- In vivo, H-120 suppressed erythroleukemia progression, promoted erythroid differentiation, and improved liver function.
Conclusions:
- H-120 demonstrates potent anti-leukemia effects through apoptosis induction and cell cycle arrest.
- H-120's mechanism involves the inhibition of STAT3 and c-Myc signaling pathways.
- H-120 shows therapeutic potential in preclinical models, suggesting its promise as a novel leukemia chemotherapeutic agent.
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