Abstract
Objective
To investigate the effects of gambogic acid (GA) on the proliferation and apoptosis of Human lung adenocarcinoma A549 cells in vitro, as well as the regulation of steroid receptor coactivator-3 (SRC-3) to explore the relationship between them.
Methods
The effect of GA on the growth of A549 cells was studied by MTT assay. Apoptosis was detected through Hoechst 33258 staining. RT-PCR and Western blot technologies were applied to assess the expression of SRC-3, whereas, the localization of SRC-3 was determined by using confocal microscopy method.
Results
GA presented striking proliferation inhibition potency on A549 cells in vitro in a time- and dose-dependent manner, with the IC50 value for 24 h was 3.17±0.13 μmol/L. Hoechst 33258 staining showed that GA could induce apoptosis in A549 cells. Over-expression of SRC-3 was found in A549 cells, whereas the mRNA and protein expression levels of SRC-3 were significantly downregulated in A549 cells induced by GA in a dose-dependent manner. The disposition of SRC-3 was situated mainly at the nuclear.
Conclusion
GA may exert its strong anti-leukemia effects through the regulation of the expression of SRC-3. It may be a new target for the therapy of lung cancer.
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This work was supported by the National Natural Science Foundation of China (No. 30472267).
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Li, R., Chen, Y., Shu, Wx. et al. Effects of gambogic acid on regulation of steroid receptor coactivator-3 in lung adenocarcinoma A549 cells. Chin. J. Cancer Res. 21, 68–73 (2009). https://doi.org/10.1007/s11670-009-0068-x
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DOI: https://doi.org/10.1007/s11670-009-0068-x