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Prostate cancer is enumerated as one of the most prevalent cancers in men, with a mortality rate of 18%. Chemotherapy is considered as a common strategy for cancer treatment; however, toxic side effects and drug resistance associated with chemotherapy are major drawbacks with this approach. It is well known that a diet rich in flavonoids can reduce the incidence of many types of cancer in a significant manner, and it was proved that methoxy flavones have greater bioavailability compared to the nonmethylated ones. Calycopterin is a tetramethoxy avone which was demonstrated to have anti-proliferative effects on colon, gastric, and osteosarcoma cancer cells. Therefore, in the current study, we have evaluated the apoptotic effects of this flavonoid on two prostate cancer cell lines in-vitro . The MTT assay revealed that after 48 h treatment with this flavonoid, cell viability reduced to 50% compared to the control group. However, calycopterin treatment of healthy HUVEC did not cause any significant reduction in cell viability. Moreover, the clonogenic assay demonstrated that after 14 days, colony size and numbers reduced significantly in calycopterin treated cells. In addition, the percentage of the sub-G1 population in calycopterin-treated cells augmented significantly compared to untreated group. Also, calycopterin-treated cells demonstrated shiny condensed nuclei with fragmented DNA indicative of apoptosis. Finally, a significant reduction in the migration ability was observed in both lines subjected to calycopterin after 48 h. To conclude, our results demonstrated the apoptotic and anti-metastatic effects of calycopterin in both hormone-dependent and independent prostate cancer cell lines.

Flavonoid Calycopterin Induces Apoptosis in Human Prostate Cancer Cells In-vitro.