Change of p53 protein in adaptable reaction of EL-4 cells induced by low dose ionizing radiation / 肿瘤

ABSTRACT

Objective: To investigate the expression of p53 protein in the adaptable reaction of EL-4 cells induced by low dose ionizing radiation (LDR), which may provide the experimental clues for studying the repair mechanism of DNA damage in the adaptable reaction of ELA cells induced by LDR. Methods: EL-4 cells were divided into control group, radiation groups (the radiation dosage was 1, 2, and 3 Gy), and adaptable radiation groups (75 mGy + 1 Gy, 75 mGy + 2 Gy, and 75 mGy + 3 Gy). The p53 mRNA and protein expression in EL-4 cells was measured by flow cytometry and RT-PCR methods, respectively. Results: The expression levels of p53 protein in the three adaptive radiation groups were significantly higher than the normal control group (P<0.01). Adaptive radiation at 75 mGy induced adaptable reaction of EL-4 cells and decreased the expression level of p53 protein compared with control group (P<0.01). The expression level of p53 mRNA showed the same change as its protein level in EL-4 cells. Conclusion: The expression level of p53 protein is decreased in the adaptive radiation group, which suggests that p53 might play important roles in the adaptable reaction of EL-4 cells induced by LDR.