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A black raspberry extract inhibits proliferation and regulates apoptosis in cervical cancer cells
Zhaoxia Zhang1, Thomas J Knobloch, Leigh G Seamon
1College of Public Health, The Ohio State University, Columbus, OH, USA.
Objective:
Cervical cancer is the second most common female cancer worldwide, and it remains a challenge to manage preinvasive and invasive lesions. Food-based cancer prevention entities, such as black raspberries and their derivatives, have demonstrated a marked ability to inhibit preclinical models of epithelial cancer cell growth and tumor formation. Here, we extend the role of black raspberry-mediated chemoprevention to that of cervical carcinogenesis.
Methods:
Three human cervical cancer cell lines, HeLa (HPV16-/HPV18+, adenocarcinoma), SiHa (HPV16+/HPV18-, squamous cell carcinoma) and C-33A (HPV16-/HPV18-, squamous cell carcinoma), were treated with a lyophilized black raspberry ethanol extract (RO-ET) at 25, 50, 100 or 200μg/ml for 1, 3 and 5days, respectively. Cell proliferation was measured by WST1 (tetrazolium salt cleavage) assays. Flow cytometry (propidium iodide and Annexin V staining) and fluorescence microscopy analysis were used to measure apoptotic cell changes.
Results:
We found that non-toxic levels of RO-ET significantly inhibited the growth of human cervical cancer cells, in a dose-dependent and time-dependent manner to a maximum of 54%, 52% and 67%, respectively (p<0.05). Furthermore, cell growth inhibition was persistent following short-term withdrawal of RO-ET from the culture medium. Flow cytometry and fluorescence microscopy demonstrated RO-ET-induced apoptosis in all cell lines.
Conclusion:
Black raspberries and their bioactive components represent promising candidates for future phytochemical-based mechanistic pathway-targeted cancer prevention strategies.
Insights
Black raspberries inhibit human cervical cancer cell growth and induce apoptosis. This study suggests black raspberries are promising for phytochemical-based cancer prevention strategies.
Area of Science:
- Oncology
- Phytochemistry
- Cancer Biology
Background:
- Cervical cancer is a significant global health challenge.
- Black raspberries show promise in inhibiting epithelial cancer cell growth.
- This research explores black raspberry chemoprevention for cervical carcinogenesis.
Purpose of the Study:
- To investigate the effects of black raspberry extract on human cervical cancer cells.
- To determine if black raspberries can inhibit cervical cancer cell growth and induce apoptosis.
Main Methods:
- Three human cervical cancer cell lines (HeLa, SiHa, C-33A) were treated with black raspberry ethanol extract (RO-ET).
- Cell proliferation was assessed using WST1 assays.
- Apoptosis was measured via flow cytometry and fluorescence microscopy.
Main Results:
- Non-toxic RO-ET levels significantly inhibited cervical cancer cell growth in a dose- and time-dependent manner (up to 67%).
- Inhibition persisted after short-term withdrawal of RO-ET.
- RO-ET induced apoptosis in all tested cell lines.
Conclusions:
- Black raspberries and their components show potential for targeted cancer prevention.
- Phytochemical-based strategies using black raspberries warrant further investigation for cervical cancer prevention.
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