【摘要】 目的:研究低温热疗(≤42℃)对肺腺癌细胞株SPC A 1的放射增敏作用及其对生长周期的影响。　方法: 集落形成率实验观察低温热疗的放射增敏作用;流式细胞仪观察细胞生长周期的变化。　结果:单纯放射时细胞的 Do、Dq值分别为1.693、2.453Gy,放射合并41.5℃加热时Do、Dq值分别为1.390、1.426Gy,热增敏比为1.218。放 射及热放射后细胞周期出现了再分布。未处理组流式细胞仪检测到S期细胞比例为14.81%,照射6Gy后48、72h 分别为18.80%和31.91%;照射后立即41.5℃加热1h,48、72h的S期细胞分别为5.89%和9.08%。　结论:低 温热疗对肺腺癌细胞系有放射增敏作用,低温热疗能去除放射引起的细胞S期阻滞,其机制可能与加热抑制了肿 瘤细胞对放射所致亚致死损伤和潜在致死损伤的修复能力有关。更多还原

【Abstract】 Objective:To investigate the radiosensitization and the cell-cycle of mild hyperthermia(≤42℃)on human pulmonary adenocarcinoma cell line SPC-A-1 in vitro. Methods: The human pulmonary adenocarcinoma cell line SPC-A were treated with radiation and the combination of radiation with mild hyperthermia. Radiosensitivity was determined by clonogenic assay and quantified by calculating the thermal enhancement ratio (TER). Flow cytometry was used to observe the cell-cycle. Results: Do, Dq calculated from the dose-response curve for radiation combined with 41.5℃ were 1.390 Gy, 1.426 Gy, whereas 1.693 Gy, 2.453 Gy for radiation alone, respectively. TER was 1.218. The proportion of cells in S phase was found to be 14.81% in the radiation group. The values, after 48 hours and 72 hours, with 6Gy radiation combined immediate 41.5℃ one hour mild hyperthermia, were 5.89% and 9.08%, respectively, versus 18.8% and 31.91% with 6 Gy radiation alone. Conclusion:Radiosensitization of mild hyperthermia in SPC-A-1 cells associated with the hyper-radiosensitization of the cells in S phase.更多还原