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Updated: Jul 16, 2026
Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation
Published on: March 5, 2018
Chemical caspase inhibitors enhance cell culture viabilities and protein titer
Nilou Arden1, Shin-Hyung Ahn, Wayne Vaz
1Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
Abstract:
Mammalian cell cultures are integral to the production of therapeutic and diagnostic proteins. A common problem encountered in culturing these cell lines, however, is a loss in viability at later stages of the cell culture process. In this study the effects of three newly synthesized chemical caspase inhibitors were investigated for their capacity to inhibit cell death. Findings show that these protease inhibitors were successful in prolonging cellular viabilities among anchorage-dependent CHO-K1 and HEK-293 cells lines. Cells treated with one inhibitor, 7312, performed as well or better when compared with the commercially known caspase inhibitor, zVAD.fmk. Suspension CHO cells producing an IgG were used to investigate the capacity of 7312 to improve protein production. Treatment of cells with 7312 increased integrated cell densities by 33% with treated cells having a higher maximum cell density and higher viability. As a result, monoclonal antibody titers increased by 20% and higher in spinner flask experiments. Increasing productivity in mammalian cell cultures has key implications for the pharmaceutical and biotechnology sectors, which are presently focused on developing methods to enhance cell performance in bioreactor environments.
Insights
Newly synthesized caspase inhibitors enhance mammalian cell culture viability and protein production. Chemical inhibitor 7312 improved cell densities and monoclonal antibody titers, offering pharmaceutical and biotechnology benefits.
Area of Science:
- Biotechnology
- Cell Biology
- Bioprocessing
Background:
- Mammalian cell cultures are crucial for producing therapeutic and diagnostic proteins.
- Cell viability loss in later culture stages is a significant challenge.
- Enhancing cell performance in bioreactors is a key focus for the pharmaceutical and biotechnology industries.
Purpose of the Study:
- To investigate the efficacy of three novel chemical caspase inhibitors in preventing cell death.
- To evaluate the impact of these inhibitors on cell viability and protein production in mammalian cell lines.
- To compare the performance of a novel inhibitor (7312) against a commercial standard (zVAD.fmk).
Main Methods:
- Treatment of anchorage-dependent CHO-K1 and HEK-293 cell lines with synthesized caspase inhibitors.
- Assessment of cellular viabilities and comparison with a commercial caspase inhibitor (zVAD.fmk).
- Culturing suspension CHO cells producing IgG with inhibitor 7312 to measure integrated cell densities and monoclonal antibody titers.
Main Results:
- The synthesized protease inhibitors successfully prolonged cellular viabilities in CHO-K1 and HEK-293 cells.
- Inhibitor 7312 demonstrated comparable or superior performance to zVAD.fmk in maintaining cell viability.
- Treatment with 7312 increased integrated cell densities by 33% and enhanced monoclonal antibody titers by over 20% in suspension CHO cells.
Conclusions:
- Novel chemical caspase inhibitors, particularly 7312, effectively enhance cell viability and productivity in mammalian cell cultures.
- These findings have significant implications for improving protein production efficiency in the pharmaceutical and biotechnology sectors.
- The use of inhibitor 7312 presents a promising strategy for optimizing cell performance in bioreactor environments.
