The characterization and quantitation of glycomic changes in CHO cells during a bioreactor campaign

Samnang Tep*, Marina Hincapie, William S. Hancock

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Within the biotechnology industry there is a continuous drive to better and more fully understand the biopharmaceutical process in order to achieve better process control. A method to monitor and quantitate glycomic changes that occur in CHO cells during a bioreactor campaign could help to address this. The goal of the method presented here is to provide data that may help to understand the changes in glycosylation that are occurring, within the cell, to proteins other than the expressed biotherapeutic. The method involves the lysing of cells to gain access to intracellular proteins. The expressed biotherapeutic is specifically removed by affinity chromatography, while the remaining proteins are subjected to deglycosylation by treatment with PNGase F. The released glycans are derivatized with isotopic tags, and quantitative analysis by MALDI-TOF MS is performed. The MALDI-TOF MS method allows for the simultaneous analysis of both neutral and sialylated glycans, displays a linear dynamic range over two orders of magnitude for both neutral and sialylated glycans and achieves sub-picomolar sensitivity. This method may yield valuable information that gives further insight into the inner-workings of CHO cells, potentially taking another step towards fully understanding and controlling the biopharmaceutical process.

Original languageEnglish
Pages (from-to)3007-3017
Number of pages11
JournalBiotechnology and Bioengineering
Volume109
Issue number12
DOIs
Publication statusPublished - Dec 2012

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Keywords

  • CHO
  • Glycomics
  • Isotopic label
  • MALDI-TOF MS

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