Get access

Enhancing Effect of Low Culture Temperature on Specific Antibody Productivity of Recombinant Chinese Hamster Ovary Cells: Clonal Variation

Authors

  • Sung Kwan Yoon,

    1. Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 371–1 Kusong-Dong, Yusong-Gu, Daejon 305–701, Korea
    Search for more papers by this author
  • Sun Ok Hwang,

    1. Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 371–1 Kusong-Dong, Yusong-Gu, Daejon 305–701, Korea
    Search for more papers by this author
  • Gyun Min Lee

    Corresponding author
    1. Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 371–1 Kusong-Dong, Yusong-Gu, Daejon 305–701, Korea
    • Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 371–1 Kusong-Dong, Yusong-Gu, Daejon 305–701, Korea. Fax: 82–42–869–2610
    Search for more papers by this author

Abstract

To understand the different responses of recombinant Chinese hamster ovary (rCHO) cells to low culture temperature regarding specific productivity ( q), 12 parental clones and their corresponding amplified clones producing a humanized antibody were cultivated at 32 and 37 °C. The specific growth rate of all clones, including both parental and amplified clones, decreased by 30–63% at 32 °C, compared to rates at 37°C. In contrast, their specific antibody productivity ( qAb) was significantly enhanced at 32 °C. Furthermore, the degree of qAb enhancement at 32 °C varied a lot from 4- to 25-fold among the parental clones. At 32 °C, most of the amplified clones, regardless of methotrexate (MTX) levels, also showed enhanced qAb but to a lesser extent than their parental clones. However, clone 14 amplified at 0.32 μM MTX (clone 14–0.32) and clone 20 amplified at 1 μM MTX (clone 20–1.00), unlike their parental clones, did not show enhanced qAb at 32 °C. Thus, it was found that the enhancing effect of low culture temperature on q of rCHO cells depends on clones. Taken together, the results obtained here emphasize the importance of clonal selection for the successful application of low culture temperature to the enhanced foreign protein production in rCHO cells.

Get access to the full text of this article

Ancillary