Abstract
Bufalin, a naturally occurring small-molecule compound from Traditional Chinese Medicine (TCM) Chansu showed inhibitory effects against human prostate, hepatocellular, endometrial and ovarian cancer cells, and leukemia cells. However, whether or not bufalin has inhibitory activity against the proliferation of human non–small cell lung cancer (NSCLC) cells is unclear. The aim of this study is to study the effects of bufalin on the proliferation of NSCLC and its molecular mechanisms of action. The cancer cell proliferation was measured by MTT assay. The apoptosis and cell cycle distribution were analyzed by flow cytometry. The protein expressions and phosphorylation in the cancer cells were detected by Western blot analysis. In the present study, we have demonstrated that bufalin suppressed the proliferation of human NSCLC A549 cell line in time- and dose-dependent manners. Bufalin induced the apoptosis and cell cycle arrest by affecting the protein expressions of Bcl-2/Bax, cytochrome c, caspase-3, PARP, p53, p21WAF1, cyclinD1, and COX-2 in A549 cells. In addition, bufalin reduced the protein levels of receptor expressions and/or phosphorylation of VEGFR1, VEGFR2, EGFR and/or c-Met in A549 cells. Furthermore, bufalin inhibited the protein expressions and phosphorylation of Akt, NF-κB, p44/42 MAPK (ERK1/2) and p38 MAPK in A549 cells. Our results suggest that bufalin inhibits the human lung cancer cell proliferation via VEGFR1/VEGFR2/EGFR/c-Met–Akt/p44/42/p38-NF-κB signaling pathways; bufalin may have a wide therapeutic and/or adjuvant therapeutic application in the treatment of human NSCLC.
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Abbreviations
- BF:
-
Bufalin
- MAPKs:
-
Mitogen-activated protein kinases
- ERK½:
-
Extracellular signal-regulated kinase ½
- NF-κB:
-
Nuclear factor κB
- VEGFR:
-
Vascular endothelial growth factor receptor
- EGFR:
-
Epidermal growth factor receptor
- LY:
-
Ly294002
- Bay:
-
Bay 11-7082
- SB:
-
SB203580
- PD:
-
PD98059
- PARP:
-
Poly(ADP-ribose) polymerase
- Cyto C:
-
Cytochrome c
- COX-2:
-
Cyclooxygenase-2
- NSCLC:
-
Non–small cell lung cancer
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Acknowledgments
The authors would like to extend our thanks to Drs. Jianyuan Li and Shaohua Jin for FACS analysis. This work is supported in part by grants from the Ministry of Education of the People’s Republic of China to G.Z, from the Ministry of Human Resources and Social Security of the People’s Republic of China to G.Z, Projects of Yantai University to GZ, Project from the National Natural Science Foundation of China to GZ (No. 30973553), and grants from the Department of Science and Technology of Shandong Province to GZ (Y2008C71; 2009GG10002087).
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The authors declare no conflict of interest.
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Yongtao Jiang and Ying Zhang contributed equally to this work.
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Jiang, Y., Zhang, Y., Luan, J. et al. Effects of bufalin on the proliferation of human lung cancer cells and its molecular mechanisms of action. Cytotechnology 62, 573–583 (2010). https://doi.org/10.1007/s10616-010-9310-0
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DOI: https://doi.org/10.1007/s10616-010-9310-0