Fraxetin Suppresses Proliferation of Non-Small-Cell Lung Cancer Cells via Preventing Activation of Signal Transducer and Activator of Transcription 3.
Lung cancer represents the leading cause of cancer-associated mortality, and non-small-cell lung cancer (NSCLC) is the most frequent histologic sub-type. It is therefore urgent to develop novel agents for the treatment of NSCLC. Fraxetin (FXT) is a potent plant-derived product and has been recognized as a promising anticancer agent for breast cancer and osteosarcoma. However, the anti-cancer potential of FXT for NSCLC remains to be elucidated. Accordingly, in the present study, we evaluated the inhibitory effect of FXT on the proliferation and growth of NSCLC cells using six human NSCLC cell lines: A549, H460, HCC827, H1650, PC-9 and H1975. FXT exhibited significant inhibitory effects on the proliferation of these cancer cell lines. By contrast, no inhibitory effect was observed on the viability of non-cancer lung cell lines even at the highest concentration of FXT (100 μM). Among the NSCLC cell lines, HCC827 and H1650 cells showed the most sensitive to FXT. Accordingly, HCC827 and H1650 cells were used for the subsequent experiments. Flow cytometric analysis revealed that FXT caused a significant cell cycle arrest and pro-apoptotic effects. Mechanistically, FXT suppressed the IL-6-induced phosphorylation of tyrosine residue (Tyr705) of signal transducer and activator of transcription 3 (STAT3) probably by binding to STAT3. Molecular docking and molecular dynamic simulations studies indicated that FXT interacts with STAT3 through hydrogen bond and hydrophobic interaction. In conclusion, these findings suggest that FXT could be a promising lead compound to be used as a novel STAT3 inhibitor and potential antitumor agent for the treatment of NSCLC.
['Zhang|Yong|Y|', 'Wang|Li|L|', 'Deng|Yan|Y|', 'Zhao|Peizhu|P|', 'Deng|Wen|W|', 'Zhang|Jing|J|', 'Luo|Jie|J|', 'Li|Rongqing|R|']
D017209:Apoptosis D001665:Binding Sites D002289:Carcinoma, Non-Small-Cell Lung D059447:Cell Cycle Checkpoints D045744:Cell Line, Tumor D049109:Cell Proliferation D003374:Coumarins D006801:Humans D008175:Lung Neoplasms D008958:Models, Molecular D010766:Phosphorylation D050796:STAT3 Transcription Factor D014410:Tumor Stem Cell Assay D018909:src Homology Domains
fraxetin non-small-cell lung cancer signal transducer and activator of transcription 3 hydrogen bond and hydrophobic interaction coumarin