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SHIP recruitment attenuates Fc gamma RIIB-induced B cell apoptosis.
R N Pearse1, T Kawabe, S Bolland
1Laboratory of Molecular Genetics and Immunology, The Rockefeller University, New York, New York 10021, USA.
Immunity
|July 14, 1999
Summary
The inhibitory Fc gamma receptor IIB (Fc gammaRIIB) can trigger B cell apoptosis independently of the B cell receptor (BCR). SHIP recruitment is crucial for Fc gammaRIIB function, impacting B cell selection in germinal centers.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Fc gamma receptor IIB (Fc gammaRIIB) is a key inhibitory receptor on B cells.
- It regulates B cell activation by interacting with the B cell receptor (BCR).
- Fc gammaRIIB signaling involves the recruitment of SH2-containing inositol phosphatase (SHIP).
Purpose of the Study:
- To investigate the independent signaling capacity of Fc gammaRIIB.
- To determine the role of SHIP in Fc gammaRIIB-mediated apoptosis.
- To elucidate the function of Fc gammaRIIB in B cell selection within germinal centers.
Main Methods:
- Investigating Fc gammaRIIB signaling pathways.
- Utilizing SHIP deletion and Fc gammaRIIB mutation models.
- Analyzing B cell apoptosis and selection mechanisms.
Main Results:
- Fc gammaRIIB can induce apoptosis independently of BCR co-ligation, requiring only its transmembrane domain.
- Impaired SHIP recruitment leads to enhanced Fc gammaRIIB-induced apoptosis.
- Fc gammaRIIB plays a role in the negative selection of B cells with low-affinity BCRs in germinal centers.
Conclusions:
- Fc gammaRIIB is an active mediator of B cell negative selection.
- SHIP-modulated signaling pathways involving Fc gammaRIIB and BCR are critical for B cell selection.
- Understanding Fc gammaRIIB function is vital for B cell immunology and autoimmune disease research.