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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Antileukemia activity of MSFTZ-a novel flavanone analog.
Anti-cancer Drugs 2006 July
A newly synthesized flavanone derivative, (+/-)-(3aRS,4SR)-2-(2-chloro-4-methyl- sulfonylphenyl)-4'-chloro-3a,4-diethoxy-flavane[4,3-d]-Delta-1,2,3-thiadiazoline (MSFTZ), was investigated for its antileukemia activity and molecular mechanisms. Cytotoxicity assay confirmed the high antiproliferative efficiency of MSFTZ in six leukemia cell lines (including two drug-resistant cell lines), with 50% inhibition of cell viability values ranging from 1.0 to 9.2 micromol/l. The results of flow cytometry assay showed that the percentage of apoptotic HL-60 cells was 68.3% after 48 h treatment with MSFTZ, suggesting that the activation of the apoptosis pathway was an anticancer property of MSFTZ. Furthermore, the protein changes related to apoptosis were investigated. Exposure of HL-60 cells to MSFTZ induced pro-caspase-9 and pro-caspase-3 cleavage, X-linked inhibitor of apoptosis protein and Bcl-X(L) downregulation, and poly(ADP-ribose) polymerase degradation. Treatment of cells with MSFTZ resulted in a time-dependent reduction in phosphorylation (activation) of extracellular signal-regulated kinase 1/2 and an increase in phosphorylation (activation) of Jun N-terminal kinase. Taken together, our results demonstrated that activation of mitogen-activated protein kinase and apoptotic cascade is involved in MSFTZ-induced antileukemia activity. All data suggest that MSFTZ is a promising chemotherapy drug.
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