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3,3'-Diindolylmethane induces apoptosis in human cancer cells
1Department of Food Engineering and Biotechnology, Technion-Israel Institute of Technology, Haifa, Israel.
Abstract:
3,3'-Diindolylmethane is a dimer of indole-3-carbinol formed both in vivo and in vitro. In this study, human cancer cells MCF-7 (with wild-type p53), T47-D (mutant p53), and Saos-2 (deficient in p53 gene), were used to examine the anticancer activities of 3,3'-diindolylmethane. The dose-dependent growth inhibitory effect was found in all these cell lines. Exposure of the cells to 50 microM solution of 3,3'-diindolylmethane for 48 h, apoptosis (programmed cell death) was evidenced by the characteristic morphology of cell nuclei under fluorescence microscope and the DNA "ladder" in agarose gel electrophoresis. The percentage of apoptotic cells in each cell line was found to be 12% for MCF-7, 14% for T47D and 13% for Saos2 cells. Exposure of MCF-7 cells to 100 microM 3,3'-diindolylmethane for 24 h, 19% of apoptotic cells were detected by flow cytometry analysis. The lowest dose required for induction of apoptosis in MCF-7 cells was found to be 10 microM after 72 h incubation. Western blot showed that wild-type p53 protein was unchanged after MCF-7 cells had been exposed to 50 microM 3,3'-diindolylmethane for 8 h. This study provides evidences that 3,3'-diindolylmethane induces apoptosis in human cancer cells and that the induction of apoptosis is independent of p53 pathway.
Insights
3,3'-Diindolylmethane effectively inhibits human cancer cell growth and induces apoptosis, a programmed cell death process. This anticancer activity is independent of the p53 pathway in tested cell lines.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- 3,3 -Diindolylmethane (DIM) is a compound derived from indole-3-carbinol.
- DIM exhibits potential anticancer properties.
- The role of DIM in cancer cell apoptosis and its relation to the p53 pathway requires further investigation.
Purpose of the Study:
- To investigate the anticancer effects of 3,3 -Diindolylmethane on human cancer cell lines.
- To determine if DIM induces apoptosis in cancer cells.
- To examine the independence of DIM-induced apoptosis from the p53 pathway.
Main Methods:
- Utilized human cancer cell lines: MCF-7 (wild-type p53), T47-D (mutant p53), and Saos-2 (p53-deficient).
- Assessed growth inhibition and apoptosis induction using fluorescence microscopy, DNA agarose gel electrophoresis, and flow cytometry.
- Analyzed p53 protein levels via Western blot.
Main Results:
- 3,3 -Diindolylmethane demonstrated a dose-dependent growth inhibitory effect across all tested cancer cell lines.
- Apoptosis was observed in MCF-7, T47-D, and Saos-2 cells upon exposure to DIM, evidenced by characteristic nuclear morphology and DNA fragmentation.
- Flow cytometry confirmed apoptosis induction in MCF-7 cells, with the lowest effective dose identified at 10 microM after 72 hours.
- Western blot analysis indicated that wild-type p53 protein levels remained unchanged, suggesting p53-independent apoptosis.
Conclusions:
- 3,3 -Diindolylmethane possesses significant anticancer activity by inducing apoptosis in human cancer cells.
- The induction of apoptosis by 3,3 -Diindolylmethane is independent of the p53 signaling pathway.
- These findings highlight DIM as a potential therapeutic agent for various cancers, irrespective of their p53 status.