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CUTTING EDGE |
2 in B Cell Development and Function1





*
Department of Molecular Genetics, Institute for Liver Research, Kansai Medical University, Moriguchi, Japan;
Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan;
First Department of Pathology, Kansai Medical University, Moriguchi, Japan; and
§
Department of Biomolecular Sciences, Fukushima Medical College, Fukushima, Japan
Cross-linking of the B cell Ag receptor (BCR) induces the
tyrosine phosphorylation of multiple cellular
substrates, including phospholipase C (PLC)-
2, which is involved in
the activation of the phosphatidylinositol pathway. To assess the
importance of PLC-
2 in murine lymphopoiesis, the PLC-
2 gene was
inducibly ablated by using IFN-regulated Cre recombinase. Mice with a
neonatally induced loss of PLC-
2 function displayed reduced numbers
of mature conventional B cells and peritoneal B1 cells and defective
responses in vitro to BCR stimulation and in vivo to immunization with
thymus-independent type II Ags. In contrast, T cell development and
TCR-mediated proliferation were normal. Taken together, PLC-
2 is a
critical component of BCR signaling pathways and is required to promote
B cell development.
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