Study on norcantharidin-induced apoptosis in SMMC-7721 cells through mitochondrial pathways
Xian-qian Li1, Shi-he Shao, Gui-lian Fu
1Pathogenic Microorganism Department, Jiangsu University, Zhenjiang, China.
Objective:
To investigate the mechanism of norcantharidin (NCTD)-induced SMMC-7721 hepatoma cell apoptosis.
Methods:
SMMC-7721 cell growth inhibition was measured by the MTT method. Apoptosis was detected by Annexin V/propidium iodide staining. The mitochondrial membrane potential was measured by flow cytometry. Western blot analysis was used to evaluate the level of cytochrome c, caspase-3, AIF, Bcl-2 and Bax expression.
Results:
NCTD inhibited SMMC-7721 cell growth in a time- and dose-dependent manner. The cells treated with NCTD showed the loss of mitochondrial membrane potential. The activities of caspase-3, cytochrome c, AIF, and Bax were up-regulated after NCTD treatment at different doses. The expression of Bcl-2 was decreased after treatment with NCTD.
Conclusions:
NCTD could induce SMMC-7721 cell apoptosis. The activation of the mitochondrial pathway was involved in the process of NCTD-induced SMMC-7721 cell apoptosis.
Insights
Norcantharidin (NCTD) triggers apoptosis in SMMC-7721 hepatoma cells by activating the mitochondrial pathway. This involves decreased Bcl-2 expression and increased caspase-3 and cytochrome c activity, inhibiting cell growth.
Area of Science:
- Hepatocellular Carcinoma Research
- Molecular Biology
- Cancer Cell Death Mechanisms
Background:
- Hepatoma, specifically SMMC-7721 cell lines, presents a significant challenge in cancer therapy.
- Understanding the molecular mechanisms of cell death induction is crucial for developing novel anti-cancer agents.
- Norcantharidin (NCTD) is a derivative of cantharidin with potential anti-tumor properties.
Purpose of the Study:
- To elucidate the mechanism by which norcantharidin (NCTD) induces apoptosis in SMMC-7721 hepatoma cells.
- To investigate the role of the mitochondrial pathway in NCTD-mediated cell death.
Main Methods:
- Cell viability was assessed using the MTT assay.
- Apoptosis was quantified via Annexin V/propidium iodide staining and flow cytometry.
- Mitochondrial membrane potential was measured using flow cytometry.
- Western blot analysis was employed to determine the expression levels of key proteins including cytochrome c, caspase-3, AIF, Bcl-2, and Bax.
Main Results:
- Norcantharidin (NCTD) demonstrated a time- and dose-dependent inhibition of SMMC-7721 cell growth.
- Treatment with NCTD led to a significant loss of mitochondrial membrane potential.
- Upregulation of caspase-3, cytochrome c, AIF, and Bax was observed post-NCTD treatment.
- A notable decrease in Bcl-2 expression was detected following NCTD administration.
Conclusions:
- Norcantharidin (NCTD) effectively induces apoptosis in SMMC-7721 hepatoma cells.
- The mitochondrial pathway plays a critical role in the apoptotic process initiated by NCTD.
