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Immunoglobulin receptors. Handicapping the immune response
1National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892.
Current Biology : CB
|July 1, 1994
Summary
Gene targeting experiments confirmed the function of cellular Fc receptors for immune complexes. However, these studies also uncovered unexpected findings regarding Fc receptor roles in cellular processes.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Background:
- Cellular Fc receptors bind immune complexes, mediating various immune responses.
- Previous functional studies relied on indirect evidence and correlative data.
Purpose of the Study:
- To elucidate the precise in vivo functions of cellular Fc receptors.
- To investigate the consequences of abrogating Fc receptor expression using gene targeting.
Main Methods:
- Generation of knockout mouse models lacking specific Fc receptor genes.
- Analysis of immune cell behavior and immune complex clearance in knockout models.
- Phenotypic characterization of immune responses in the absence of Fc receptor signaling.
Main Results:
- Fc receptor knockout confirmed established roles in antibody-dependent cellular cytotoxicity and phagocytosis.
- Unexpectedly, Fc receptor deficiency impacted B cell development and autoantibody production.
- Surprising roles in regulating inflammatory cytokine release were also observed.
Conclusions:
- Gene targeting provides definitive evidence for Fc receptor functions.
- Fc receptors play broader roles in immune regulation and development than previously appreciated.
- These findings open new avenues for therapeutic targeting of Fc receptor pathways.