The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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The Journal of Experimental Medicine, Vol 137, 301-316, Copyright © 1973 by The Rockefeller University Press

ARTICLE

BINDING OF ANTIGEN BY IMMUNOCYTES : I. EFFECT OF LIGAND VALENCE ON BINDING AFFINITY OF MOPC 315 CELLS FOR DNP CONJUGATES



Jean-Claude Bystryn 1, Gregory W. Siskind 1, and Jonathan W. Uhr 1

1 From the Department of Dermatology, New York University School of Medicine, New York 10016, the Division of Allergy and Immunology, Cornell University Medical College, New York 10021, and the Department of Microbiology, University of Texas Southwestern Medical School, Dallas, Texas 75235

The binding of antigen to cells with antibody on their surface has been studied in a model system consisting of murine myeloma cells (MOPC 315) and DNP conjugates. Specific binding occurred between the DNP groups of DNP conjugates and cell surface immunoglobulin.

Using this model, the binding affinities of multivalent and univalent DNP conjugates were measured directly by equilibrium-binding techniques and indirectly by displacement of bound conjugate with univalent hapten. With both approaches the multivalent conjugate was shown to bind to cells with an avidity 100–300 fold greater than the univalent hapten. Nonspecific binding of unrelated protein and repeated washing of cells was found to markedly dedecrease the specific binding of univalent conjugates, presumably because the relatively weak bonds dissociate readily.

 Submitted on September 19, 1972


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