Cytotechnology

, Volume 14, Issue 3, pp 205–218 | Cite as

Cell cycle kinetics of the accumulation of heavy and light chain immunoglobulin proteins in a mouse hybridoma cell line

  • Sandra J. Kromenaker
  • Friedrich Srienc
Article

Abstract

Rates of accumulation of immunoglobulin proteins have been determined using flow cytometry and population balance equations for exponentially growing murine hybridoma cells in the individual G1, S and G2+M cell cycle phases. A producer cell line that secretes monoclonal antibodies, and a nonproducer clone that synthesizes only κ-light chains were analyzed. The pattern for the kinetics of total intracellular antibody accumulation during the cell cycle is very similar to the previously described pattern for total protein accumulation (Kromenaker & Srienc 1991). The relative mean rate of heavy chain accumulation during the S phase was approximately half the relative mean rate of light chain accumulation during this cell cycle phase. This indicates an unbalanced synthesis of heavy and light chains that becomes most pronounced during this cell cycle phase. The nonproducer cells have on average an intracellular light chain content that is 42% lower than that of the producer cells. The nonproducer cells in the G1 phase with low light chain content did not have a significantly higher rate of light chain accumulation relative to other G1 phase nonproducer cells. This is in sharp contrast to what was observed for the G1 phase producer cells. In addition, although the relative mean rate of accumulation of light chain was negative for G2+M phase nonproducer cells, the magnitude of this relative mean rate was less than half that observed for the producer cells in this cell cycle phase. This suggests that the mechanisms that regulate the transport of fully assembled antibody molecules through the secretion pathway differ from those which regulate the secretion of free light chains. The results reported here indicate that there is a distinct pattern for the cell cycle dynamics of antibody synthesis and secretion in hybridomas. These results are consistent with a model for the dynamics of secretion which suggests that the rate of accumulation of secreted proteins will be greatest for newborn cells due to an interruption of the secretion pathway during mitosis.

Key words

Cell cycle flow cytometry heavy chain hybridoma light chain monoclonal antibody population balance 

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Sandra J. Kromenaker
    • 1
  • Friedrich Srienc
    • 1
  1. 1.Department of Chemical Engineering and Materials Science and Institute for Advanced Studies in Biological Process TechnologyUniversity of MinnesotaMinneapolis/St. PaulUSA

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