Apigenin Induces Apoptosis through a Mitochondria/Caspase-Pathway in Human Breast Cancer MDA-MB-453 Cells
1Plant Resources Research Institute, Duksung Women's University, 419 Ssangmun-dong, Tobong-ku, Seoul 132-714, South Korea.
Abstract:
In this study, we investigated the mechanistic role of the caspase cascade in extrinsic and intrinsic apoptosis induced by apigenin, which has been targeted as a candidate in the development of noncytotoxic anticancer medicines. Treatment with apigenin (1-100 microM) significantly inhibited the proliferation of MDA-MB-453 human breast cancer cells in a dose- and time-dependent manner with IC(50) values of 59.44 and 35.15 microM at 24 and 72 h, respectively. This inhibition resulted in the induction of apoptosis and the release of cytochrome c in cells exposed to apigenin at its 72 h IC(50). Subsequently, caspase-9, which acts in mitochondria-mediated apoptosis, was cleaved by apigenin. In addition, apigenin activated caspase-3, which functions downstream of caspase-9. The apigenin-induced activation of caspase-3 was accompanied by the cleavage of capases-6, -7, and -8. These results are supported by evidence showing that the activity patterns of caspases-3, -8, and -9 were similar. The present study supports the hypothesis that apigenin-induced apoptosis involves the activation of both the intrinsic and extrinsic apoptotic pathways.
Insights
Apigenin, a potential anticancer drug, triggers programmed cell death (apoptosis) in breast cancer cells. It activates both intrinsic and extrinsic cell death pathways by cleaving key caspases.
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Apigenin is investigated as a non-cytotoxic anticancer agent.
- Understanding its mechanism in apoptosis is crucial for drug development.
Purpose of the Study:
- To elucidate the role of the caspase cascade in apigenin-induced apoptosis.
- To determine if apigenin activates both intrinsic and extrinsic apoptotic pathways.
Main Methods:
- Treatment of MDA-MB-453 human breast cancer cells with varying concentrations of apigenin.
- Assessment of cell proliferation inhibition and apoptosis induction.
- Analysis of caspase cleavage and cytochrome c release.
Main Results:
- Apigenin inhibited breast cancer cell proliferation in a dose- and time-dependent manner.
- Apigenin induced apoptosis, cytochrome c release, and cleavage of caspase-9.
- Apigenin activated caspase-3, leading to the cleavage of caspases-6, -7, and -8, indicating activation of both intrinsic and extrinsic pathways.
Conclusions:
- Apigenin-induced apoptosis in breast cancer cells involves the caspase cascade.
- Apigenin activates both the intrinsic and extrinsic apoptotic pathways, supporting its potential as an anticancer therapeutic.
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