Necrotic Effect versus Apoptotic Nature of Camptothecin in Human Cervical Cancer Cells
Abbas Zare-Mirakabadi1, Ali Sarzaeem2, Saeed Moradhaseli1
1Dept. of Venomous Animals and Antivenom Production, Razi Vaccine and Serum Research Institute, Karaj, Iran.
Background:
Functional defects in mitochondria are involved in the induction of cell death in cancer cells. The process of programmed cell death may occur through the mechanisms of apoptosis. Several potential lead molecules such as Camptothecin (CPT) and its analogues have been isolated from plants with anticancer effect. The aim of the present study was to understand the necrotic effect versus apoptotic nature of CPT in HeLa cancer cells.
Methods:
The anti-proliferative activity of CPT was estimated through 3-(4, 5- Dimethyl Thiazol-2-yl)-2, 5-diphenyl Tetrazolium bromide (MTT) assay and DNA fragmentation analysis using gel electrophoresis. Lactate Dehydrogenase (LDH) activity and cell morphology were assessed under control and CPT exposed conditions to evaluate the necrotic effect of CPT.
Results:
The results showed that CPT inhibited the proliferation of HeLa cells in a dose-dependent manner with an Inhibitory Concentration 50% (IC50) of 0.08±0.012 µg/ml. However the significant (p<0.05) increase happens in LDH activity at concentrations 1×10(-1)µg/ml and above. Morphological changes showed that CPT in low concentrations induced an apoptotic mechanism of cell death, such as cell shrinkage and characteristic rounding of dying cells, while at high concentrations showed necrosis changes. The characteristic DNA ladder formation of CPT-treated cells in agarose gel electrophoresis confirmed the results obtained by light microscopy and LDH assay.
Conclusion:
Camptothecin as an anticancer drug may have anti-proliferative effect on HeLa cancer cells in low concentrations, through its nature of induction of apoptosis. The border line between necrotic effect and apoptotic nature of CPT in HeLa cancer cells has been found to be at concentration of 1×10(-1) µg/ml.
Insights
Camptothecin (CPT) inhibits HeLa cancer cell proliferation. Low CPT concentrations induce apoptosis, while high concentrations cause necrosis, with a transition point at 1×10(-1) µg/ml.
Area of Science:
- Biochemistry
- Cell Biology
- Pharmacology
Background:
- Mitochondrial dysfunction is implicated in cancer cell death, potentially via apoptosis.
- Camptothecin (CPT) and its analogues are plant-derived compounds with anticancer properties.
- Understanding CPT's mechanism of action in cancer cells is crucial for drug development.
Purpose of the Study:
- To investigate the apoptotic versus necrotic effects of Camptothecin (CPT) in HeLa cancer cells.
- To determine the dose-dependent activity of CPT on cancer cell proliferation and death.
- To identify the concentration threshold distinguishing CPT-induced apoptosis from necrosis.
Main Methods:
- Cell proliferation was assessed using the MTT assay.
- DNA fragmentation and Lactate Dehydrogenase (LDH) activity were measured to evaluate cell death.
- Cell morphology was analyzed under light microscopy to distinguish between apoptosis and necrosis.
Main Results:
- CPT inhibited HeLa cell proliferation in a dose-dependent manner, with an IC50 of 0.08±0.012 µg/ml.
- LDH activity significantly increased at CPT concentrations of 1×10(-1) µg/ml and above, indicating cell damage.
- Low CPT concentrations induced apoptotic morphology (cell shrinkage), while high concentrations led to necrotic changes, confirmed by DNA laddering.
Conclusions:
- CPT exhibits anti-proliferative effects on HeLa cells, primarily through apoptosis induction at lower concentrations.
- The transition from CPT-induced apoptosis to necrosis in HeLa cells occurs around 1×10(-1) µg/ml.
- CPT's dual effect on cell death mechanisms warrants further investigation for cancer therapy.
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