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The Journal of Immunology, Vol 144, Issue 1 239-243, Copyright © 1990 by American Association of Immunologists

ARTICLES

Interactions between murine B lymphocyte surface membrane molecules. Loaded but not free receptors for complement and the Fc portion of IgG co-cap independently with cross-linked surface Ig

GC Tsokos, T Kinoshita, G Thyphronitis, AD Patel, HB Dickler and FD Finkelman
Department of Medicine, National Institute of Diabetes, Digestive, and Kidney Diseases, Bethesda, MD.

We have investigated the possible physical interactions between CR, receptors for the Fc gamma R and surface Ig (sIg) on the surface membrane of murine B lymphocytes. We used the rat mAb to murine CR, 8C12, and 7G6, as CR ligands, and soluble Ag-antibody complexes as FcR ligands; and F(ab')2 fragments of rabbit antibodies specific for mouse IgM and IgD as sIg ligands. We have found that: 1) sIg, CR, and Fc gamma R are not directly linked, because capping of any one did not affect the expression of the others; 2) the mAb 8C12 and 7G6 failed by themselves to cross-link CR; 3) soluble Ag-antibody complexes crosslinked some, Fc gamma R on a minority of Fc gamma R+ lymphocytes; 4) once loaded with anti-CR mAb, CR co-capped with sIg when sIg was cross-linked; 5) once loaded with Ag-antibody complexes, Fc gamma R also co-capped with sIg when sIg was sIg was cross-linked; 6) loading of Fc gamma R did not affect the co-capping of surface CR with cross- linked sIg and conversely, loading of CR did not affect the co-capping of Fc gamma R with cross-linked sIg; only loaded CR or Fc gamma R co- capped with sIg regardless of the status of the other surface molecule; 7) neither loaded nor free CR co-capped with cross-linked Fc gamma R, and neither loaded nor free Fc gamma R co-capped with cross-linked CR. These results demonstrate that both Fc gamma R and CR independently become associated with sIg when either receptor is loaded and sIg is cross-linked.


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