Biotechnology and Bioprocess Engineering:BBE

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Permanent Mycoplasma Removal Removel from Tissue Culture Cells: A Genetic Approach

  • Motr, Gabriele (Biomedical Research Center, Hyland Immuno Division, Heathcare, Baxter Healthcare.) ;
  • Preininger, Alexandra (Biomedical Research Center, Hyland Immuno Division, Heathcare, Baxter Healthcare.) ;
  • Himmelspach, Michele (Biomedical Research Center, Hyland Immuno Division, Heathcare, Baxter Healthcare.) ;
  • Plaimauer, Barbara (Biomedical Research Center, Hyland Immuno Division, Heathcare, Baxter Healthcare.) ;
  • Arbesser, Christine (Biomedical Research Center, Hyland Immuno Division, Heathcare, Baxter Healthcare.) ;
  • York, Heinz (Biomedical Research Center, Hyland Immuno Division, Heathcare, Baxter Healthcare.) ;
  • Dorner, Friedrich (Biomedical Research Center, Hyland Immuno Division, Heathcare, Baxter Healthcare.) ;
  • Schlokat, Use (Biomedical Research Center, Hyland Immuno Division, Heathcare, Baxter Healthcare.)
  • Published : 2000.04.01
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Abstract

Mycopasma contamination of tissue culture cells easily evades detection and, thus, represents a continous therat to cell biologists. In case where infected cell can not simply be replaced, attempts have to be made to eradicate mycoplacma from the tissue culture cells. A variety of anti-microbial agents have been shown to be toxic to mycoplasma strains ; however, cell associated mycoplasma are often protected from antibiotics at concentrations shown to be effective in vitro. Antibiotic concentrations high enough to be lethal to cell as sociated mycoplasmas frequently are also detrimentrations to the host cells, while moderately increased antibiotic levels tolerated by the host cells often lead to only temporary growth suppression and/or to the emergence of mycoplasma strains resistanct even to high concentrations of the antibiotis applied. Hare, a genetic approach for the elimination of mycoplasma from tissue culture cells that overcomes thens limitations is described. By expression of a selection marker conferring resistance to an otherwise toxic agent, Acholeplasma laidlawii infected BHK-21 cells used as the model system were enabled to temporarily tolerate antibiotic concentrations high enough to be lethal to cell associated mycopalsma while leaving the host cells unharmed. Upon successful mycoplasma eradicated, cultvation of the cured host cells in the absence of the selective agent yielded revertant cell clones that had regained susceptibillity to the toxic agent. Cressation of the selection marker expression was shown to result from the loss of the selection marker DNA, which is a consequence of the fact that the stable and permanent integration of foreign DNA in eucaryotic cell chrosomes is highly inefficient. Thus, the cells were cured from mycoplasma yet remained biochemically unaltered.

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