, Volume 25, Issue 1, pp 17-23

First online:

Anti-apoptotic genes, bag-1 and bcl-2, enabled hybridoma cells to survive under treatment for arresting cell cycle

  • Satoshi Terada
  • , Katsuyuki Fukuoka
  • , Tetsuo Fujita
  • , Tomoaki Komatsu
  • , Shinichi Takayama
  • , John C. Reed
  • , Eiji Suzuki

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Hybridoma 2E3-O cells were transfected with bcl-2 alone or with bcl-2 and bag-1 in combination. The bcl-2/bag-1 transfectant survived maintaining viability above 75% for almost 5 days when the cells were treated with excess (30 mM) thymidine for arresting cell cycle, whereas the mock transfectant survived for only 2 days, and the bcl-2 alone transfectant lived for 4 days. Owing to this extended viable culture period, the bcl-2/bag-1 transfectant produced twofold amount of antibody in comparison with the mock transfectant in non-proliferating state prepared by the excess thymidine treatment. When their proliferation was arrested by serum limitation, the bcl-2/bag-1 transfectant and the bcl-2 alone transfectant survived for 3 days maintaining viability above 75% while the mock transfectant survived only 1 day. The bcl-2/bag-1 transfectans produced the antibody at the rate three times as high as the bcl-2 alone transfectant and the mock transfectant in non-proliferating state established by serum limitation. Such genetic engineering of hybridoma cells for improving survival in the non-proliferating state will be useful for using nutrients in culture medium efficiently to produce antibody, since nutrients could be diverted from cell proliferation to antibody production in such non-proliferating viable cell culture.

anti-apoptotic bag-1 bcl-2 cell cycle arrest excess thymidine serum limitation