1，2-二氯乙烷对淋巴细胞DNA损伤的γH2AX识别抗体流式细胞术检测

Detecting DNA damage of human iymphocytes exposed to 1, 2-DCE with TH2AX identified antibody using flow cytometer assay

目的探讨γH2AX识别抗体流式细胞术（FCM）检测1，2-二氯乙烷（1，2-DCE）接触工人外周血淋巴细胞DNA损伤的可行性及1，2-DCE对健康人外周血淋巴细胞DNA的损伤。方法提取某制鞋厂接触1，2-DCE的工人21例（接触组）和该厂未接触l，2-DCE的工人27例（内对照组）及某海岛非职业接触有害因素居民28例（外对照组）的外周血淋巴细胞，采用FCM法检测淋巴细胞DNA损伤情况；用不同浓度（5、10、20和30μmol／L）的l，2-DCE分别对健康人外周血淋巴细胞体外染毒0．5、1．0h，采用FCM法检测淋巴细胞DNA损伤情况：结果接触组工人DNA损伤率（4．05％±2．55％）明显高于内对照组工人（1．97％±1．40％）和外对照组人群（0．23％±0．13％），内对照组明显高于外对照组，差异均有统计学意义（P〈0．01或P〈0．05）；接触组工人外周血淋巴细胞的几何平均荧光强度（3．33±3．01）与内对照组（2．07±0．58）比较，差异有统计学意义（P〈0．05）。接触组不同工龄工人DNA损伤率和外周血淋巴细胞的几何平均荧光强度比较，差异均无统计学意义（P〉0．05）。体外染毒0．5h时，20、30μmol／L染毒组外周血淋巴细胞的几何平均荧光强度与阴性对照组比较，差异有统计学意义（P〈0．01）。体外染毒1．0h时，20、30μmol／L染毒组的DNA损伤率与阴性对照组比较，差异有统计学意义（P〈O．05，P〈0．01），10、20、30μmol/L染毒组外周血淋巴细胞的几何平均荧光强度与阴性对照组比较，差异均有统计学意义（P〈0．05，P〈0．01）。结论1，2-DCE具有遗传损伤作用，FCM法是一种检测外周血淋巴细胞DNA损伤的有效方法。

Objective To study DNA damage of human peripheral blood lymphocytes exposed to 1,2- dichloroethane （1,2-DCE） with flow cytometry （FCM） assay. Methods The lymphocytes were obtained from 21 workers who are occupationally exposed to 1, 2-DCE （exposed group ） and 27 workers who were not exposed to 1,2-DCE in the same factory （inner control） and 28 island residents who had never been occupationally exposed to adverse factors （external control）. FCM assay was adopted to detect DNA damage of the lymphocytes of each group. Lympbocytes of the health people were incubated with 1 ,2 - DCE at different doses, and FCM assay was used to detect DNA damage. Results DNA damage rate （%） of the exposed group of exposed workers （4.05%±2.55%） was significantly higher than the inner control group of workers （ 1.97%± 1.40%） and external control groups of island residents （0.23%±0.13% ）, and the DNA damage of inner control was higher than the external control, all the differences were statistically significant （P〈0.01 or P〈0.05 ）.The geometric mean fluorescence intensity of the workers in the exposed group （3.33±3.01） was significantly higher thanthe （2.07±0.58） only （P〈0.05）. There was no significant difference in the DNA damage rate as well as the geometric mean fluorescence intensity among the exposed group of workers with different years of working period （P〉0.05）. In vitro, the fluorescence intensity at the dose of 20,30 μmol/L for 0.5 h exposure showed statistical significance compared with the negative control group （P〈0.01）. The DNA damage rate at the dose of 20, 30 μmol/L for 1.0 h exposure was statistically significant compared with the negative control group （P〈0.05,P〈 0.01 ）; The fluorescence intensity at the dose of 10,20,30 μmol/L for 1.0 h exposure was statistically significantcompared with the negative control group（P〈0.05,P〈0.01 ）. Conclusion 1 ,2-DEC can cause DNA damage. And γH2AX FCM assay can be a sensitive, objective and effective method of detecting DNA damage of peripheral blood lymphocytes.