The Journal of Experimental Medicine
Cytokines Montreal 2008
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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/02/551/12 $2.00
Volume 185 February 1997 551-562

Viral Superantigen Drives Extrafollicular and Follicular B Cell Differentiation Leading to Virus-specific Antibody Production

By Sanjiv A. Luther,* Adam Gulbranson-Judge,§ Hans Acha-Orbea,*Dagger and Ian C.M. MacLennan§

From the * Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, 1066 Epalinges, Switzerland; the Dagger  Institute of Biochemistry, University of Lausanne, 1066 Epalinges, Switzerland; and the § Department of Immunology, University of Birmingham Medical School, Birmingham, B15 2TT, United Kingdom

Mouse mammary tumor virus (MMTV[SW]) encodes a superantigen expressed by infected B cells. It evokes an antibody response specific for viral envelope protein, indicating selective activation of antigen-specific B cells. The response to MMTV(SW) in draining lymph nodes was compared with the response to haptenated chicken gamma globulin (NP-CGG) using flow cytometry and immunohistology. T cell priming occurs in both responses, with T cells proliferating in association with interdigitating dendritic cells in the T zone. T cell proliferation continues in the presence of B cells in the outer T zone, and B blasts then undergo exponential growth and differentiation into plasma cells in the medullary cords. Germinal centers develop in both responses, but those induced by MMTV(SW) appear later and are smaller. Most T cells activated in the T zone and germinal centers in the MMTV(SW) response are superantigen specific and these persist for weeks in lymph nodes draining the site MMTV(SW) injection; this contrasts with the selective loss of superantigen-specific T cells from other secondary lymphoid tissues. The results indicate that this viral superantigen, when expressed by professional antigen-presenting cells, drives extrafollicular and follicular B cell differentiation leading to virus-specific antibody production.


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