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J. Exp. Med., Volume 188, Number 7, October 5, 1998 1333-1342

The Inositol Polyphosphate 5-Phosphatase Ship Is a Crucial Negative Regulator of B Cell Antigen Receptor Signaling

By Qiurong Liu,* Antonio J. Oliveira-Dos-Santos,* Sanjeev Mariathasan,Dagger Denis Bouchard,* Jamie Jones,* Renu Sarao,* Ivona Kozieradzki,* Pamela S. Ohashi,Dagger §parallel Josef M. Penninger,*Dagger § and Daniel J. Dumont*Dagger

From the * Amgen Institute, Toronto, Ontario, Canada M5G 2C1; the Dagger  Department of Medical Biophysics and the § Department of Immunology, University of Toronto, Ontario, Canada M5G 2M9; and the parallel  Ontario Cancer Institute, Toronto, Ontario, Canada M5G 2M9

Ship is an Src homology 2 domain containing inositol polyphosphate 5-phosphatase which has been implicated as an important signaling molecule in hematopoietic cells. In B cells, Ship becomes associated with Fcgamma receptor IIB (Fcgamma RIIB), a low affinity receptor for the Fc portion of immunoglobulin (Ig)G, and is rapidly tyrosine phosphorylated upon B cell antigen receptor (BCR)-Fcgamma RIIB coligation. The function of Ship in lymphocytes was investigated in Ship-/- recombination-activating gene (Rag)-/- chimeric mice generated from gene-targeted Ship-/- embryonic stem cells. Ship-/-Rag-/- chimeras showed reduced numbers of B cells and an overall increase in basal serum Ig. Ship-/- splenic B cells displayed prolonged Ca2+ influx, increased proliferation in vitro, and enhanced mitogen-activated protein kinase (MAPK) activation in response to BCR-Fcgamma RIIB coligation. These results demonstrate that Ship plays an essential role in Fcgamma RIIB-mediated inhibition of BCR signaling, and that Ship is a crucial negative regulator of Ca2+ flux and MAPK activation.

Key words: inositol phosphataseFcgamma receptor IIB inhibitory signalsignal transductionB cell antigen receptor signalinggene targeting


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