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[RP105 and B cell apoptosis]
Y Miura1, Y Yamashita, K Miyake
1Department of Immunology, Saga Medical School.
Abstract:
The RP105 is a novel, murine B cell surface molecule that is expressed on mature B cells but not on pre-B or T cells. The RP105 is a 150 kDa type I transmembrane protein, and a member of the leucine-rich repeat protein family. Tandem repeats of a leucine-rich motif in the extracellular domain are thought to be involved in processes such as cell adhesion or receptor-ligand interactions. An antibody against RP105 protects B cells from irradiation- or dexamethasone-induced apoptosis, and drives them to proliferate. B cells activated by RP105-ligation arrest their growth and undergo apoptosis when the antigen receptor is engaged. Thus, RP105 is a signal transduction molecule and seems to have a role in regulation of B cell growth and death.
Insights
RP105, a novel B cell surface molecule, regulates B cell growth and death. Antibodies against RP105 protect B cells from apoptosis and promote proliferation, indicating its role in immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Cell Biology
Context:
- RP105 is a newly identified molecule on the surface of B cells.
- It belongs to the leucine-rich repeat protein family and functions as a type I transmembrane protein.
- Its extracellular domain features tandem repeats involved in cell adhesion and receptor-ligand interactions.
Purpose:
- To investigate the function of RP105 in B cell regulation.
- To determine the effects of RP105 ligation on B cell survival and proliferation.
Summary:
- RP105 is expressed on mature B cells but not on pre-B or T cells.
- Antibodies targeting RP105 prevent apoptosis induced by irradiation or dexamethasone and stimulate B cell proliferation.
- Activation via RP105 leads to growth arrest and apoptosis upon engagement of the antigen receptor, highlighting its role as a signal transduction molecule.
Impact:
- RP105 plays a crucial role in regulating B cell homeostasis.
- Understanding RP105 function could lead to new therapeutic strategies for B cell-related disorders.
- This research provides insights into the complex signaling pathways governing B cell fate.