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J. Exp. Med., Volume 187, Number 5, March 2, 1998 807-811

BRIEF DEFINITIVE REPORT:
Inhibition of the B Cell by CD22: A Requirement for Lyn

By Kenneth G.C. Smith,* David M. Tarlinton,Dagger Gina M. Doody,* Margaret L. Hibbs,§ and Douglas T. Fearon*

From the * Wellcome Trust Immunology Unit, Department of Medicine, University of Cambridge School of Clinical Medicine, Cambridge, England CB2 2SP; the Dagger  Walter and Eliza Hall Institute of Medical Research, Royal Melbourne Hospital, Parkville, Victoria 3050, Australia; and the § Ludwig Institute for Cancer Research, Tumour Biology Branch, Royal Melbourne Hospital, Victoria 3050, Australia

Mice in which the Lyn, Cd22, or Shp-1 gene has been disrupted have hyperactive B cells and autoantibodies. We find that in the absence of Lyn, the ability of CD22 to become tyrosine phosphorylated after ligation of mIg, to recruit SHP-1, and to suppress mIg-induced elevation of intracellular [Ca2+] is lost. Therefore, Lyn is required for the SHP-1-mediated B cell suppressive function of CD22, accounting for similarities in the phenotypes of these mice.


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