title: [Biological properties of Caski cell lines induced by exposing to the space environment].
abstract: OBJECTIVE
  To investigate the biological properties of Caski cell lines induced by exposing to the space environment.
  
  
  METHODS
  Caski cells were carried in "Shen Zhou IV" airship. After 7 days of spaceflight, cells survived and were monocoloned, and the experimental methods such as cell morphological observation, the cell proliferation assay, flow cytometry cell cycle analysis, the soft agar assay, and tumorigenesis assay were used to analyze cell growth characteristics and malignant phenotypes.
  
  
  RESULTS
  Altogether 1440 strains subclonal cell lines were established and 4 strains were screened. Compared with the control group, mutated cells appeared to have multiple cell morphological changes. Strains numbered 44F10 and 17E3 were screened due to their increased cell proliferation and tumorigenesis, and their cell cycles were induced to progress from G(1) to S phase, while strains 48A9 and 31F2 were opposite to 44F10 and 17E3 in cytological events. The average population double time of ground nomal control group, ground simulant control group, strains numbered 44F10, 17E3, 48A9 and 31F2 groups were 56.54, 58.44, 52.96, 51.46, 101.76 and 88.47h, respectively; compared with the control group, the average double time of strains numbered 44F10 and 17E3 was decline, but with no statistical significance. However, compared with the control groups, the average double time of 48A9 and 31F2 was significant increased (P<0.05). The colony formation rates were 9.7%, 9.3%, 14.7%, 12.1%, 0 and 0.1%, respectively, and the difference between the ground control groups and the other groups was significant (P<0.01); 6 groups of above-mentioned Caski cells were inoculated subcutaneously in Babl/c nude mice respectively. Forty-seven days later, the formed tumors in the nude mice were statistically analyzed and tested. The average weight of tumors of the above-mentioned groups was 0.066, 0.066, 0.175, 0.249, 0.011 and 0.018g. The difference between the ground control groups and other groups was significant (P<0.05).
  
  
  CONCLUSIONS
  Spaceflight may affect the physiological characteristics of tumor cells and the variation is complicated.
authors.affiliation: Cancer Research Institute of Central South University,Changsha 410078, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Yang
authors.forename: Guan-cheng
authors.initials: GC
authors.lastname: Li
authors.forename: Yue-hui
authors.initials: YH
authors.lastname: Li
authors.forename: Jin-yue
authors.initials: JY
authors.lastname: Hu
authors.forename: Yan
authors.initials: Y
authors.lastname: Xiao
authors.forename: Zhi-jie
authors.initials: ZJ
authors.lastname: Zhang
mesh_terms: D000818:Animals; D002453:Cell Cycle; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D005260:Female; D006801:Humans; D051379:Mice; D008807:Mice, Inbred BALB C; D008819:Mice, Nude; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000473:pathology; D013026:Space Flight; D014183:Transplantation, Heterologous; D002583:Uterine Cervical Neoplasms / Q000473:pathology*; D014893:Weightlessness