title: Establishment of a tetraploid cell line from mouse H-1 (ES) cells highly polyploidized with demecolcine.
abstract: OBJECTIVE
  Establishment of tetraploid ES cells.
  
  
  METHODS
  Mouse H-1 (ES) cells were polyploidized by demecolcine and released from the drug.
  
  
  RESULTS
  A tetraploid cell line (4nH1 cells) was established from mouse H-1 (ES) cells (2nH1 cells) highly polyploidized by treatment with demecolcine. Cell cycle parameters of 4nH1 cells were almost the same as those of 2nH1 cells, suggesting that the rate of DNA synthesis was about twice that of the diploid cells. Mode of chromosome number of 4nH1 cells was 76, about twice that of 2nH1 cells. Cell volume of 4nH1 cells was about twice of that of diploid cells, indicating that 4nH1 cells contained about twice as much total intracellular material as 2nH1 cells. Morphology of the 4nH1 cells was flagstone-like, thus differing from that of the spindle-shaped 2nH1 cells, suggesting that the transformation had occurred during the diploid-tetraploid transition. 4nH1 cells exhibited alkaline phosphatase activity and formed teratocarcinomas, implying that they would be pluripotent.
  
  
  CONCLUSIONS
  A pluripotent tetraploid cell line (4nH1 cells) was established.
authors.affiliation: Division of Cell Medicine, Research Institute of Medical Science, Kanazawa Medical University, Uchinada, Ishikawa 920-0293, Japan. fujikawa@kanazawa-med.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Fujikawa-Yamamoto
authors.forename: M
authors.initials: M
authors.lastname: Miyagoshi
authors.forename: H
authors.initials: H
authors.lastname: Yamagishi
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic; D018929:Cell Culture Techniques / Q000379:methods*; D002460:Cell Line; D003703:Demecolcine; D053595:Embryonic Stem Cells / Q000166:cytology*; D051379:Mice; D008809:Mice, Inbred C3H; D039904:Pluripotent Stem Cells / Q000166:cytology*; D011123:Polyploidy; D033581:Stem Cell Transplantation; D018243:Teratocarcinoma
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D003703:Demecolcine