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BioMed Research International
Volume 2015, Article ID 465105, 6 pages
Research Article

3,3′-Diindolylmethane: A Promising Sensitizer of γ-Irradiation

Department of Blood Biopharmaceuticals and Viral Detection, Institute of Transfusion Medicine, The Academy of Military Medical Sciences, Beijing 100850, China

Received 15 July 2015; Revised 8 October 2015; Accepted 11 October 2015

Academic Editor: Stephen H. Safe

Copyright © 2015 Wenjing Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. Radiotherapy is an effective treatment modality in the clinical treatment of breast cancer. The present work investigated the effect of 3,3′-diindolylmethane (DIM) on γ-irradiation sensitizing human breast carcinoma. Methods. Cell survival, intracellular ROS levels, cell cycle distribution, cell apoptosis, and expression of proteins related to apoptosis were measured with MTT assays, flow cytometry, and Western blot analysis, respectively. Results. In vitro DIM plus γ-irradiation arrested the activity of G2/M phase cell cycle, increased intracellular ROS level, significantly suppressed PARP (poly ADP-ribose polymerase), and enhanced γ-irradiation-induced apoptosis, thereby inhibiting the proliferation of MCF-7 cells. Conclusion. These data provide a rationale for the use of DIM as a promising sensitizer of γ-irradiation.