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Updated: Jun 16, 2026
04:47
A Method to Assess Fc-mediated Effector Functions Induced by Influenza Hemagglutinin Specific Antibodies
Published on: February 23, 2018
Engineered Fc variant antibodies with enhanced ability to recruit complement and mediate effector functions
Gregory L Moore1, Hsing Chen, Sher Karki
1Xencor, Inc., Monrovia, CA, USA.
Mabs
|February 13, 2010
Summary
Researchers engineered antibody Fc regions to boost complement-dependent cytotoxicity (CDC) and other immune responses against cancer. These variants significantly enhanced antibody potency, offering new tools for developing more effective antibody therapies.
Area of Science:
- Immunology
- Biotechnology
- Antibody Engineering
Background:
- Enhancing cytotoxic activity of therapeutic antibodies is crucial for cancer and pathogen treatment.
- The complement system plays a significant role in the efficacy of certain antibodies.
- Optimizing complement recruitment by antibodies is an active area of research.
Purpose of the Study:
- To engineer Fc variants with enhanced complement-recruiting ability.
- To investigate the combined effects of Fc modifications on antibody effector functions.
- To expand the therapeutic potential of monoclonal antibodies.
Main Methods:
- Generation of Fc variants with improved complement binding.
- Testing enhanced antibodies in complement-dependent cytotoxicity (CDC) assays.
- Evaluating combined Fc modifications for multiple effector functions (CDC, ADCC, phagocytosis).
Main Results:
- Fc variants demonstrated up to 23-fold enhanced cytotoxic potency against tumor cells.
- Engineered variants showed increased C1q binding affinity.
- Combined substitutions additively or synergistically improved effector functions.
- Significant CDC enhancement observed for antibodies targeting CD40 and CD19.
Conclusions:
- Engineered Fc variants expand the toolkit for developing potent therapeutic antibodies.
- Optimized synergy between Fc gamma receptors and complement pathways can enhance tumor and pathogen destruction.
- These modifications offer improved therapeutic potential for monoclonal antibodies.
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