LI Meng-xia,WANG Dong,XIANG De-bing,ZHANG Yun-song,YANG Yu-xin,LONG Zai-yun.Mitochondrial translocation of DNA damage and repair protein APE1 in human osteosarcoma cell after ionizing radiation[J].J Amry Med Univ (J Third Mil Med Univ),2007,29(15):1458-1461.
LI Meng-xia,WANG Dong,XIANG De-bing,ZHANG Yun-song,YANG Yu-xin,LONG Zai-yun.Mitochondrial translocation of DNA damage and repair protein APE1 in human osteosarcoma cell after ionizing radiation[J].J Amry Med Univ (J Third Mil Med Univ),2007,29(15):1458-1461.DOI:
Objective To investigate mitochondrial localization of apurinic/aprimidinic endonuclease/redox factor-1 (APE1) in human osteosarcoma cells after ionizing radiation (IR)
shedding light on further study of the role of mitochondrial DNA repair in resistance to radiotherapy for osteosarcoma. Methods The mitochondrial localization of APE1 in untreated human osteoblast sarcoma (HOS) cells and HOS cells exposed to 12 Gy X-ray was observed by laser confocal microscopy
then confirmed by Western blot. Results APE1 in untreated HOS cells and HOS cells exposed to 12 Gy X-ray for 1
2
3 h could translocate to mitochondria
and the cytoplasm/nucleus fluorescent intensity values were (0.78±0.04)
(1.04±0.03)
(1.14±0.05)
(1.80±0.38)
respectively. Mitochondrial APE1 protein increasing in time course was also confirmed by Western blot. Conclusion APE1 can shift from nuclus to mitochondria at early stage after IR treatment
and increase within time-course
suggesting APE1 may play a crucial role in mitochondrial DNA repair of osteosarcoma cells after IR.