tailieunhanh - Báo cáo khoa học: " The radiosensitizer 2-benzoyl-3-phenyl-6,7-dichloroquinoxaline 1,4-dioxide induces DNA damage in EMT-6 mammary carcinoma cells"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: " The radiosensitizer 2-benzoyl-3-phenyl-6,7-dichloroquinoxaline 1,4-dioxide induces DNA damage in EMT-6 mammary carcinoma cells. | Radiation Oncology BioMed Central Open Access The radiosensitizer 2-benzoyl-3-phenyl-6 7-dichloroquinoxaline 1 4-dioxide induces DNA damage in EMT-6 mammary carcinoma cells Joelle Haykal1 Fady Geara2 Makhluf J Haddadin3 Colin A Smith1 and Hala Gali-Muhtasib 1 Address Department of Biology American University of Beirut Beirut Lebanon 2Department of Radiation Oncology American University of Beirut Beirut Lebanon and 3Department of Chemistry American University of Beirut Beirut Lebanon Email Joelle Haykal - jmh05@ Fady Geara - fg00@ Makhluf J Haddadin - haddadin@ Colin A Smith - cs10@ Hala Gali-Muhtasib - amro@ Corresponding author Published 14 July 2009 Received 12 March 2009 Radiation Oncology 2009 4 25 doi 1748-717X-4-25 Accepted 14 July 2009 This article is available from http content 4 1 25 2009 Haykal et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract Background DCQ 2-benzoyl-3-phenyl-6 7-dichloroquinoxaline 1 4-dioxide a synthetic quinoxaline 1 4-dioxide enhances the cytotoxic effect of ionizing radiation IR in vivo and in vitro. We sought to clarify whether increased radiation-induced DNA damage decreased rate of damage repair and the generation of reactive oxygen species ROS contribute to DCQ enhancement of IR. Methods Murine mammary adenocarcinoma EMT-6 cells were treated with DCQ for 4 h before exposure to 10 Gy IR. Treated cells were monitored for modulations in cell cycle induction of DNA damage and generation of ROS. Results Combined DCQ and IR treatments DCQ IR induced rapid cell-cycle arrests in EMT-6 cells particularly in S and G2 M phases. Alkaline comet assays revealed high levels of DNA damage in cells after exposure to

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