Abstract
To investigate the effects of adenovirus melanoma differentiation associated gene-7 (mda-7)/IL-24 on the growth and apoptosis of human breast cancer cells. Human breast cancer cells of the lines MCF-7 and MD-MBA-453 were cultured and transfected with purified adenovirus mda-7/IL-24. 48 h later, Western blotting was used to detect the protein expression of mda-7/IL-24 in the MCF-7 cells. The growth of Ad-mda-7/IL-24 in the MCF-7 cells was assayed by crystal violet staining and MTT method. The apoptotic effect of Ad-mda-7/IL-24 in the MCF-7 and MDA-MB-453 cells was detected by Hoechst staining and annexin V method. Nude mice were inoculated with MCF-7 cells and randomly divided into 2 groups to be injected with Ad-mda-7/IL-24 of PBS. The size of tumor was observed. Western blotting showed that mda-7/IL-24 was expressed in the transfected MCF-7 cells. Crystal violet staining and MTT method showed that Ad-mda-7/IL-24 dose and time-dependently inhibited the growth of the MCF-7 and MDA-MB-453 cells. Hochst staining and annexin V test indicated obvious apoptosis of the breast cancer cells. The size of tumor of the nude mice injected with Ad-mda-7/IL-24 was significantly smaller than that of the control mice. Ad-mda-7/IL-24 effectively inhibits the growth of breast cancer cells and induces its apoptosis.
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