Carcinogenesis, Teratogenesis & Mutagenesis ›› 2021, Vol. 33 ›› Issue (2): 89-94.doi: 10.3969/j.issn.1004-616x.2021.02.002

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Induction of pyroptosis by X-rays in human umbilical vein endothelial cells

LI Chen, TIAN Mei, QI Xuesong, WANG Chunyan, QU Gonglin, SHAO Shuai, WANG Chengfang, GOU Qiao   

  1. National Institute for Radiological Protection, Chinese Center for Disease Control and Prevention, Key Laboratory of Radiological Protection and Nuclear Emergency, China CDC, Beijing 100088, China
  • Received:2020-11-23 Revised:2021-03-15 Online:2021-03-30 Published:2021-04-12

Abstract: OBJECTIVE: To investigate the effects of X-ray irradiation on pyroptosis of human umbilical vein endothelial cells (HUVEC). METHODS: Pyroptosis is an inflammatory programmed cell death process. Cells were irradiated with a single dose of 10 Gy X-ray. In order to investigate the occurrence of X-ray induced pyroptosis,levels of IL-1 β,IL-6,TNF-α and IL-18 which were secreted by HUVEC cells from 0 to 72 h after the radiation were determined using the ELISA assay. Caspase-1 which is cleaved to the activated state is a key step of pyroptosis. Therefore,the activated levels of Caspase-1 were detected using Western blot at 6-48 h after the single dose of 10 Gy X-ray irradiation. Morphological changes of HUVECs were detected using transmission electron microscopy (TEM) at 72 h after the irradiation. Flow cytometry (FCM) was used to detect the changes of pyroptosis after a single dose and a small dose of multiple exposures (2.5 Gy/d×4 d). RESULTS: Compared with the control group,the levels of IL-1 β,IL-6,TNF-α and IL-18 in HUVEC cells 0-72 h after the radiation were significantly higher (P<0.05) and the levels of activated Caspase-1 at 6-48 h after the radiation was increased (P<0.05). The cell volumes were increased with swelling. The percentages of pyroptoti cells after the single and multiple exposures were significantly higher than that of the control group (P<0.01). In addition,the pyroptotic death rates after the single dose was twice as high as that after the multiple doses (P<0.01). CONCLUSION: X-ray exposure induced pyroptosis in HUVEC cells. Under the same total dose,the damage levels from the single dose exposure were significantly higher than that from the multiple exposures.

Key words: X-ray, HUVEC, pyroptosis, Caspase-1

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