K Fujikawa-Yamamoto1, M Miyagoshi, X Luo, H Yamagishi. 1. Division of Cell Medicine, Research Institute of Medical Science, Kanazawa Medical University, Uchinada, Ishikawa, Japan. fujikawa@kanazawa-med.ac.jp
Abstract
OBJECTIVES: DNA content of diploid H1 (ES) cells (2H1 cells) has been shown to be stable in long-term culture; however, tetraploid and octaploid H1 (ES) cells (4H1 and 8H1 cells, respectively) were DNA-unstable. Pentaploid H1 (ES) cells (5H1 cells) established recently have been found to be DNA-stable; how, then is cell DNA stability determined? To discuss ploidy stability, decaploid H1 (ES) cells (10H1 cells) were established from 5H1 cells and examined for DNA stability. MATERIALS AND METHODS: 5H1 cells were polyploidized using demecolcine (DC) and 10H1 cells were obtained by one-cell cloning. RESULTS: Number of chromosomes of 10H1 cells was 180 and durations of their G(1), S, and G(2)/M phases were 3, 7 and 6 h respectively. Volume of 10H1 cells was double that of 5H1 cells and morphology of 10H1 cells was flagstone-like in shape. 10H1 cells exhibited alkaline phosphatase activity and their DNA content decayed in 91 days of culture. 10H1 cells injected into mouse abdomen formed solid tumours that contained several kinds of differentiated cells with lower DNA content, suggesting that 10H1 cells were pluripotent and DNA-unstable. Loss of DNA stability was explained using a hypothesis concerning DNA structure of polyploid cells as DNA reconstructed through ploidy doubling was arranged in mirror symmetry in a new configuration. CONCLUSION: In the pentaploid-decaploid transition of H1 cells, cell cycle parameters and pluripotency were retained, but morphology and DNA stability were altered.
OBJECTIVES: DNA content of diploid H1 (ES) cells (2H1 cells) has been shown to be stable in long-term culture; however, tetraploid and octaploid H1 (ES) cells (4H1 and 8H1 cells, respectively) were DNA-unstable. Pentaploid H1 (ES) cells (5H1 cells) established recently have been found to be DNA-stable; how, then is cell DNA stability determined? To discuss ploidy stability, decaploid H1 (ES) cells (10H1 cells) were established from 5H1 cells and examined for DNA stability. MATERIALS AND METHODS: 5H1 cells were polyploidized using demecolcine (DC) and 10H1 cells were obtained by one-cell cloning. RESULTS: Number of chromosomes of 10H1 cells was 180 and durations of their G(1), S, and G(2)/M phases were 3, 7 and 6 h respectively. Volume of 10H1 cells was double that of 5H1 cells and morphology of 10H1 cells was flagstone-like in shape. 10H1 cells exhibited alkaline phosphatase activity and their DNA content decayed in 91 days of culture. 10H1 cells injected into mouse abdomen formed solid tumours that contained several kinds of differentiated cells with lower DNA content, suggesting that 10H1 cells were pluripotent and DNA-unstable. Loss of DNA stability was explained using a hypothesis concerning DNA structure of polyploid cells as DNA reconstructed through ploidy doubling was arranged in mirror symmetry in a new configuration. CONCLUSION: In the pentaploid-decaploid transition of H1 cells, cell cycle parameters and pluripotency were retained, but morphology and DNA stability were altered.
Authors: A A Kruglova; E A Kizilova; A I Zhelezova; M M Gridina; A N Golubitsa; O L Serov Journal: Cell Tissue Res Date: 2008-10-22 Impact factor: 5.249
Authors: Natalia M Matveeva; Inna E Pristyazhnyuk; Symbat A Temirova; Alexey G Menzorov; Anna Vasilkova; Alexander G Shilov; Austin Smith; Oleg L Serov Journal: Mol Reprod Dev Date: 2005-07 Impact factor: 2.609