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Evaluating the bottlenecks of recombinant IgM production in mammalian cells

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Abstract

Despite the fact, that monoclonal antibodies are the fastest growing group of biopharmaceuticals in development, this is not true for the IgM class, which remains as enigmatic as ever. While more examples of usefulness of IgMs for medical applications are emerging, their recombinant production is still not common. In our study, stable monoclonal IgM producing CHO DG44 and HEK 293 cell lines, expressing two model IgM molecules (IgM-617 and IgM-012) were established. Recombinant cell lines were compared in regard of specific productivity, specific growth rate, maximal achieved antibody titer, gene copy numbers and transcription levels of transgene. IgM-617 cell lines were identified as high while IgM-012 clones were low producers. Although differences in gene copy numbers as well as in transcription levels were observed, they did not seem to be a limitation. Levels of relevant endoplasmic reticulum-stress related proteins were analyzed and no indications of unfolded protein response were detected. This could indicate that the difference in the intrinsic protein stability of our model proteins (as was previously observed on purified samples) might cause lower yields of IgM-012. Transcriptomics and/or proteomics follow up studies might be necessary for identification of potential bottlenecks in IgM producing cell lines.

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Acknowledgments

Funded by the PhD program “BioToP - Biomolecular Technology of Proteins” (Austrian Science Funds, FWF Project W1224). We thank Emilio Casanova (Ludwig Boltzmann Institute for Cancer Research, Vienna) for critical reading.

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Authors and Affiliations

  1. Department of Biotechnology, Vienna Institute of BioTechnology (BOKU – VIBT), University of Natural Resources and Life Sciences, Muthgasse 11, 1190, Vienna, Austria

    Veronika Chromikova, Alexander Mader, Willibald Steinfellner & Renate Kunert

  2. Department of Biotechnology, Vienna Institute of BioTechnology (BOKU – VIBT), University of Natural Resources and Life Sciences, Muthgasse 18, 1190, Vienna, Austria

    Alexander Mader

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  1. Veronika Chromikova
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Correspondence to Alexander Mader.

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Chromikova, V., Mader, A., Steinfellner, W. et al. Evaluating the bottlenecks of recombinant IgM production in mammalian cells. Cytotechnology 67, 343–356 (2015). https://doi.org/10.1007/s10616-014-9693-4

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  • DOI: https://doi.org/10.1007/s10616-014-9693-4

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