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Journal of Environmental Pathology, Toxicology and Oncology
IF: 1.241 5-Year IF: 1.349 SJR: 0.519 SNIP: 0.613 CiteScore™: 1.61

ISSN Print: 0731-8898
ISSN Online: 2162-6537

Journal of Environmental Pathology, Toxicology and Oncology

DOI: 10.1615/JEnvironPatholToxicolOncol.2013007280
pages 189-203

Biochanin A Enhances the Radiotoxicity in Colon Tumor Cells In Vitro

Abhay Puthli
Department of Life Sciences, University of Mumbai, Mumbai, India; Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Mumbai, India
Reeta Tiwari
Department of Life Sciences, University of Mumbai, Mumbai, India; Radiological Physics & Advisory Division, Bhabha Atomic Research Centre, Mumbai, India
Kaushala Prasad Mishra
Department of Life Sciences, University of Mumbai, Mumbai, India; Nehru Gram Bharati University, Allahabad, UP, India; Foundation for Education and Research, India and BM International Research Centre, Mumbai, India

ABSTRACT

Herbs and other plant-based compounds have increasingly been recognized as useful for the prevention and treatment of cancer. There exists enormous scope for screening and evaluation of herbal/plant products to develop an effective radiosensitizer and radioprotector that is relevant for cancer therapy. Anticancer agents that can effectively trigger the process of cell death in tumor cells need to be developed. This study describes the effect of the flavonoid biochanin A (BCA), administered alone or in combination with gamma radiation, on the growth of radioresistant human colon cancer HT29 cells in vitro. Proliferation studies were carried out using MTT assay with increasing concentration of BCA (1−100 µM) followed by gamma irradiation at a dose of 2 Gy. Induced reactive oxygen species, mitochondrial membrane potential, lipid peroxidation, and caspase-3 activation were measured by fluorescence assays and the magnitude of induced apoptosis in cells was evaluated by flow cytometry. Cellular DNA damage was determined by comet assay. Combined treatment caused a significant decrease in cell proliferation, a substantial increase in the generation of reactive oxygen species, enhanced lipid peroxidation, and increased mitochondrial membrane potential in treated HT29 cells compared with controls. Significantly enhanced apoptosis and DNA damage were found with a combination of drug and radiation treatments. Furthermore, it was found that combined treatment yielded an additive increase of caspase-3 in these cells. Our findings indicate that BCA acts as a remarkable pro-oxidant, significantly enhancing the radiotoxicity of colon cancer cells in vitro.


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