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Monoclonal antibodies to murine CD40 define two distinct functional epitopes
A W Heath1, W W Wu, M C Howard
1DNAX Research Institute, Palo Alto, CA 94304.
European Journal of Immunology
|August 1, 1994
Summary
Researchers developed two rat monoclonal antibodies targeting distinct epitopes on murine CD40. These antibodies, 1C10 and 4F11, exhibit unique functional properties, impacting B cell proliferation and antigen expression, suggesting distinct roles for CD40 epitopes in B cell biology.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- CD40 is a crucial co-stimulatory receptor on B cells involved in immune responses.
- Understanding CD40 epitopes is essential for developing targeted immunotherapies.
- Previous studies have not fully elucidated the functional differences between CD40 epitopes.
Purpose of the Study:
- To generate and characterize novel monoclonal antibodies against murine CD40.
- To investigate the distinct epitopes on CD40 and their functional implications.
- To explore the role of these epitopes in B cell activation and proliferation.
Main Methods:
- Generation of rat IgG2a monoclonal antibodies against murine CD40.
- Binding assays using recombinant CD40 and L cells.
- Immunoprecipitation of CD40 from murine splenic B cells.
- Functional assays including B cell proliferation, antigen upregulation, and growth arrest rescue.
Main Results:
- Two antibodies, 1C10 and 4F11, were generated, recognizing distinct CD40 epitopes.
- 1C10 directly induced B cell proliferation and antigen upregulation.
- 4F11 synergized with other stimuli to promote B cell proliferation and rescue from growth arrest.
- Antibodies did not cross-block each other's binding, confirming distinct epitopes.
Conclusions:
- Murine CD40 possesses at least two functionally distinct epitopes.
- These epitopes mediate different aspects of B cell activation and survival.
- The findings have implications for designing targeted therapies modulating CD40 signaling.