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Proteomic Profiling of Macrophages by 2D Electrophoresis
Published on: November 4, 2014
Profiling of host cell proteins by two-dimensional difference gel electrophoresis (2D-DIGE): Implications for
Mi Jin1, Nicolas Szapiel, Jennifer Zhang
1Bristol-Myers Squibb Company, Syracuse, New York 13057, USA.
Biotechnology and Bioengineering
|September 10, 2009
Summary
Host cell proteins (HCPs) are critical impurities in biologic drugs. Cell viability significantly impacts HCP profiles, and comparative proteomic profiling using 2D-DIGE aids downstream process design and immunoassay development.
Area of Science:
- Biopharmaceutical manufacturing
- Proteomics and analytical chemistry
Background:
- Host cell proteins (HCPs) are major impurities in biologic drugs derived from cell cultures.
- Monitoring and removing HCPs is crucial for drug safety and efficacy.
- Understanding HCP composition variability is essential for optimizing downstream processing.
Purpose of the Study:
- To investigate the impact of upstream process parameters on HCP profiles in CHO cell cultures.
- To evaluate the suitability of null cell cultures for generating HCP immunoassay reagents.
- To demonstrate the utility of 2D-DIGE for comparative HCP analysis.
Main Methods:
- Two-dimensional difference gel electrophoresis (2D-DIGE) was employed for comparative proteomic profiling of HCPs.
- HCPs from CHO cell cultures were analyzed under various upstream conditions (media, bioreactor control, feeding, duration, viability).
- HCP profiles from production and null cell cultures were compared.
Main Results:
- Cell viability was identified as the most significant factor influencing HCP profiles.
- 2D-DIGE revealed that HCPs from production cell cultures are well-represented in null cell cultures.
- The study confirmed the suitability of null cell lines for generating HCP immunoassay reagents.
Conclusions:
- Cell viability is a critical parameter affecting HCP composition in biopharmaceutical production.
- 2D-DIGE provides valuable insights into HCP heterogeneity, complementing traditional immunoassays.
- Null cell cultures are suitable for developing robust HCP immunoassays.
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