title: Octaploid Meth-A cells are established from a highly polyploidized cell population.
abstract: Tetraploid Meth-A cells were polyploidized by demecolcin, an inhibitor of spindle fibre formation in M phase, and then released from the drug 1, 2, 3 and 4 days after the addition. Octaploid cells were successfully established from cell populations including hexadecaploid cells produced by 2, 3 and 4 days of exposure to demecolcin. One-day-treated cells were polyploidized octaploid cells, but they returned to tetraploid cells. All of the octaploid Meth-A cells showed essentially the same features. The octaploid Meth-A cells had eight homologous chromosomes and double the DNA content of the parent tetraploid cells. The doubling time of octaploid Meth-A cells was 30.2 h, somewhat longer than the 28.3 and 24.0 h of tetraploid and diploid cells, respectively. The fractions of cells in the G1, S and G2/M phases were essentially the same in diploid, tetraploid and octaploid Meth-A cells. The cell volume of octaploid Meth-A cells was about two times that of the tetraploid cells. It was concluded that octaploid Meth-A cells were established from transient hexadecaploid cells produced by the polyploidization of tetraploid cells that had been established from diploid cells.
authors.affiliation: Division of Basic Science, Research Institute of Medical Science, Kanazawa Medical University, Ishikawa, Japan. fujikawa@kanazawa-med.ac.jp
authors.forename: Kohzaburo
authors.initials: K
authors.lastname: Fujikawa-Yamamoto
authors.forename: Hiroko
authors.initials: H
authors.lastname: Yamagishi
authors.forename: Minoru
authors.initials: M
authors.lastname: Miyagoshi
mesh_terms: D000818:Animals; D002453:Cell Cycle; D002455:Cell Division; D004273:DNA, Neoplasm / Q000032:analysis / Q000737:chemistry; D003703:Demecolcine / Q000633:toxicity; D007621:Karyotyping; D008748:Methylcholanthrene / Q000633:toxicity; D051379:Mice; D008957:Models, Genetic; D011123:Polyploidy; D012509:Sarcoma / Q000235:genetics / Q000473:pathology; D014407:Tumor Cells, Cultured
chemical_list: D004273:DNA, Neoplasm; D008748:Methylcholanthrene; D003703:Demecolcine