Long-term cultivation of Chinese hamster fibroblasts V-79 RJK under elevated temperature results in karyotype destabilization

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• 作者：T. M. Grinchuk ; M. A. Shilina ; L. L. Alekseenko
• 关键词：heat shock proteins ; hyperthermia ; karyotype destabilization ; stress ; temperature resistance
• 刊名：Cell and Tissue Biology
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：9
• 期：2
• 页码：119-126
• 全文大小：405 KB
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  Vogel, J.L., Parsell, D.A.,
• 作者单位：T. M. Grinchuk (1)
  M. A. Shilina (1)
  L. L. Alekseenko (1)
  
  1. Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
  
• 刊物主题：Cell Biology;
• 出版者：Springer US
• ISSN：1990-5203

文摘

In this article, we show that long-term cultivation of Chinese hamster fibroblasts V-79 RJK at elevated temperature resulted in the selection of variants with genetic changes at the level of karyotype. Beginning at the first steps of thermoresistance (to a temperature of 40°C) selection, we identified a population of cells with changes in the karyotype (polyploidy, deletions, inversions, chromosomal translocations, cells with DM-chromosomes). Further cultivation was accompanied with selection of cells with breaks near centromeres and homogeneously staining regions on chromosomes. Nonspecific destabilization of the karyotype (at the initial stages of selection) was accompanied with increased gene expression of hsc70 (constitutive iso-form of heat shock protein of the HSP70 family) and pgp1 (p-glycoprotein membrane transporter). Expression of these genes returned to the basal level during long-term cultivation at the elevated temperature, but the cells retained karyotypic changes.