Objective: To study the effects of acetaminophen (ACE) combined with radiation on the progeny of the human glioma cell line SHG-44, and to investigate if ACE may be an useful therapeutic radiosensitivity agent in t...Objective: To study the effects of acetaminophen (ACE) combined with radiation on the progeny of the human glioma cell line SHG-44, and to investigate if ACE may be an useful therapeutic radiosensitivity agent in the treatment of recurrent human glioma. Methods: A randomized, controlled experiment, was performed at the Department of Radiology Laboratory, the First Hospital Affiliated to Soochow University, between September 2004 and January 2006. Brain glioma SHG-44 cells were divided into three groups: SHG-44, SHG-44-10, and SHG-44-10 + ACE cells groups. The SHG-44-10 cells group was irradiated with dose of 10 Gy by a linear accelerator (6 MVX). It was passaged for 15 generations and cultured in RPMI-1640 culture media. Then SHG-44-10 + ACE cells group was treated with ACE. Measures: Community re-double time, mean lethal dose (DO), extrapolation number (N), fraction surviving fraction irradiated by 2 Gy dose (SF2), quasi-threshold dose (Dq), and cell cycle. Results: The SF2 of the SHG-44, SHG-44-10, and SHG-44-10 + ACE cells groups were 70.8%, 80.6% and 45.2%, respectively, with significance (P = 0.040). The SHG-44-10 and SHG-44-10 + ACE cells groups were irradiated with 8 Gy. After 12 hours, the G2/M ratio of the SHG-44-10 and SHG-44-10 + ACE cells groups were indicating significantly higher ratio compared to pre-irradiated groups (P 〈 0.01). After 24 hours, the G2/M ratio of the SHG-44-10 cells group decreased rapidly, while the ratio of the SHG-44-10 + ACE cells group still maintained in high level. Conclusion: In the present study, Subtoxic dose of ACE increased the radiosensitivity of the progeny of irradiated human glioma cell. ACE may be an useful radiosensitivity agent in the treatment of recrudescent human malignant glioma.展开更多
文摘目的研究人参皂苷Rh2(GS-Rh2)下调Wnt/β-catenin信号通路调控SHG44细胞的增殖和凋亡。方法体外培养SHG44细胞,以5、10、20、40、80μg/m L的GS-Rh2作用24 h和48 h,MTT法检测细胞增殖情况,流式细胞技术检测细胞凋亡情况,RT-PCR检测细胞Wnt-1,β-catenin m RNA表达的变化,Western blot检测GS-Rh2对SHG44细胞Wnt-1、β-catenin蛋白表达的变化。结果与空白对照组比较,5、10、20、40、80μg/m L GS-Rh2作用24 h和48 h时,SHG44细胞增殖抑制率依次升高(P<0.05),SHG44细胞总凋亡率依次增大(P<0.05);与空白对照组比较,5、10、20、40、80μg/m L GS-Rh2作用24 h和48 h时,SHG44细胞Wnt-1、β-catenin m RNA和蛋白水平依次降低(P<0.05)。结论 GS-Rh2具有一定的抗肿瘤活性,可抑制SHG44细胞增殖、诱导其凋亡,且具有剂量依赖性,其作用机制可能与下调Wnt/β-catenin信号通路有关。
文摘Objective: To study the effects of acetaminophen (ACE) combined with radiation on the progeny of the human glioma cell line SHG-44, and to investigate if ACE may be an useful therapeutic radiosensitivity agent in the treatment of recurrent human glioma. Methods: A randomized, controlled experiment, was performed at the Department of Radiology Laboratory, the First Hospital Affiliated to Soochow University, between September 2004 and January 2006. Brain glioma SHG-44 cells were divided into three groups: SHG-44, SHG-44-10, and SHG-44-10 + ACE cells groups. The SHG-44-10 cells group was irradiated with dose of 10 Gy by a linear accelerator (6 MVX). It was passaged for 15 generations and cultured in RPMI-1640 culture media. Then SHG-44-10 + ACE cells group was treated with ACE. Measures: Community re-double time, mean lethal dose (DO), extrapolation number (N), fraction surviving fraction irradiated by 2 Gy dose (SF2), quasi-threshold dose (Dq), and cell cycle. Results: The SF2 of the SHG-44, SHG-44-10, and SHG-44-10 + ACE cells groups were 70.8%, 80.6% and 45.2%, respectively, with significance (P = 0.040). The SHG-44-10 and SHG-44-10 + ACE cells groups were irradiated with 8 Gy. After 12 hours, the G2/M ratio of the SHG-44-10 and SHG-44-10 + ACE cells groups were indicating significantly higher ratio compared to pre-irradiated groups (P 〈 0.01). After 24 hours, the G2/M ratio of the SHG-44-10 cells group decreased rapidly, while the ratio of the SHG-44-10 + ACE cells group still maintained in high level. Conclusion: In the present study, Subtoxic dose of ACE increased the radiosensitivity of the progeny of irradiated human glioma cell. ACE may be an useful radiosensitivity agent in the treatment of recrudescent human malignant glioma.