The Journal of Experimental Medicine
Randox clinical diagnostic solutions
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Journal of Experimental Medicine, Vol 173, 487-489, Copyright © 1991 by Rockefeller University Press


ARTICLES

Efficient and selective presentation of antigen-antibody complexes by rheumatoid factor B cells

E Roosnek and A Lanzavecchia
Basel Institute for Immunology, Switzerland.

Using Epstein-Barr virus B cell clones and antigen-specific T cell clones, we asked how antigen-antibody complexes are handled by B cells. We found that the only B cells capable of efficient presentation of antigen-antibody complexes are those that bind the complexes via membrane immunoglobulin, i.e., rheumatoid factor-producing B cells and, to a lower extent, antigen-specific B cells. On the contrary, nonspecific B cells, although capable of binding antigen-antibody complexes, fail to present them to T cells. Thus, rheumatoid factor B cells can present any antigen in the context of an immune complex and be triggered by T cells specific for a variety of foreign antigens. These results demonstrate a mechanism of intermolecular help that may be responsible for the production of rheumatoid factor and possibly of other types of autoantibodies.
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