Document Type : Short Communications
Department of Applied Cell Sciences, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran.
Gene Therapy Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
Cell-based Therapies Research Center, Digestive Disease Research Institute, Shariati Hospital, Tehran University of Medical Science, Tehran, Iran.
Background: Preclinical development of new drugs for cancer immunotherapy requires preconditioning total body irradiation (TBI) of mice to be humanized via hematopoietic stem cell transplantation. To assess the effect of preconditioning TBI, we detected the reactive oxygen species (ROS), Annexin V, propidium iodide (PI) level in bone marrow samples by flow cytometer. Methods: We divided all NOG mice between irradiated (n = 20) and control groups (n = 10) for two time points. Irradiated mice were exposed to 3.5 Gy of radiation. After sacrificing BM samples were collected, the flow cytometric percentage of ROS, Annexin V, and PI markers were investigated on days 2 and 14 after exposure. Results: At the first time point, the level of ROS was higher in the irradiated group than in the control group, and this difference was statistically significant (P < 0.05). Also, at the second time point, the mean differences of all markers in the irradiated group were significantly compared to the control group (P < 0.05). Conclusion: Thus, in NOG mice, the measurement of ROS level is helpful to the assessment of preconditioning TBI.