title: [Detecting DNA damage of human lymphocytes exposed to 1,2-DCE with γH2AX identified antibody using flow cytometer assay].
abstract: 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. Lymphocytes 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 than the (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 significant compared with the negative control group (P < 0.05, P < 0.01).
  
  
  CONCLUSIONS
  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.
authors.affiliation: The Institute of Occupational and Environmental Health, Zhejiang University, Hangzhou 310058, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Ying-yan
authors.initials: YY
authors.lastname: Guo
authors.forename: Wei
authors.initials: W
authors.lastname: Wu
authors.forename: Ji-li
authors.initials: JL
authors.lastname: Bai
authors.forename: Zhi-qiang
authors.initials: ZQ
authors.lastname: Xuan
authors.forename: Jun
authors.initials: J
authors.lastname: Yang
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
mesh_terms: D000328:Adult; D002470:Cell Survival; D020552:Comet Assay; D004249:DNA Damage; D005025:Ethylene Dichlorides / Q000633:toxicity*; D005260:Female; D005434:Flow Cytometry / Q000379:methods*; D006801:Humans; D018655:Lymphocyte Count; D008214:Lymphocytes / Q000187:drug effects*; D008297:Male; D016273:Occupational Exposure
chemical_list: D005025:Ethylene Dichlorides; C024565:ethylene dichloride