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      저자 : Alireza Nikoofar (검색결과 1 건)
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        Caffeic Acid Phenethyl Ester Increases Radiosensitivity of Estrogen Receptor- Positive and -Negative Breast Cancer Cells by Prolonging Radiation-Induced DNA Damage

        Nastaran Masoudi Khoram,Bahareh Bigdeli,Alireza Nikoofar,Bahram Goliaei 한국유방암학회 2016 Journal of breast cancer Vol.19 No.1

        Purpose: Breast cancer is an important cause of death among women. The development of radioresistance in breast cancer leads to recurrence after radiotherapy. Caffeic acid phenethyl ester (CAPE), a polyphenolic compound of honeybee propolis, is known to have anticancer properties. In this study, we examined whether CAPE enhanced the radiation sensitivity of MDAMB- 231 (estrogen receptor-negative) and T47D (estrogen receptor- positive) cell lines. Methods: The cytotoxic effect of CAPE on MDA-MB-231 and T47D breast cancer cells was evaluated by performing an 3-(4,5-dimethylthiazol-2-yl)-2,5 diphenyltetrazolium bromide (MTT) assay. To assess clonogenic ability, MDAMB- 231 and T47D cells were treated with CAPE (1 μM) for 72 hours before irradiation, and then, a colony assay was performed. A comet assay was used to determine the number of DNA strand breaks at four different times. Results: CAPE decreased the viability of both cell lines in a dose- and time-dependent manner. In the clonogenic assay, pretreatment of cells with CAPE before irradiation significantly reduced the surviving fraction of MDA-MB-231 cells at doses of 6 and 8 Gy. A reduction in the surviving fraction of T47D cells was observed relative to MDA-MB-231 at lower doses of radiation. Additionally, CAPE maintained radiation-induced DNA damage in T47D cells for a longer period than in MDA-MB-231 cells. Conclusion: Our results indicate that CAPE impairs DNA damage repair immediately after irradiation. The induction of radiosensitivity by CAPE in radioresistant breast cancer cells may be caused by prolonged DNA damage.

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