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Specificity of the passive antibody-induced suppression of the humoral immune response of mice to surface antigens on human cells

, : Specificity of the passive antibody-induced suppression of the humoral immune response of mice to surface antigens on human cells. Immunology 54(2): 223-231

The effect of passively administered antibody on the humoral immune response of BALB/c mice to antigenic determinants on human cells has been examined. Antiserum raised by immunizing mice with the human leukaemic cell line K562, which lacks HLA-A,B,C antigens, was administered to mice, together with the HLA-A,B,C-positive cell line, BALM-1. The antibody response to the unique antigen was assessed by measuring the ability of the resultant antiserum to inhibit the binding to BALM-1 cells of a labelled monoclonal antibody, 7B6, which is specific for a monomorphic HLA-A,B,C determinant. As an indication of the immune response to antigens common to K562 and BALM-1, the ability of the same antiserum to inhibit the binding of monoclonal antibody 6B1, which detects an epitope common to both cell lines, was measured. Passive antibody to K562 blocked the immune response of mice to the common antigen on BALM-1 cells. However, the response to the antigen not recognized by the passive antibody was unaffected, even though the two antigens were present on the same immunizing cell. Thus, the effect of passive antibody was 'determinant specific'. Similar results were obtained, irrespective of whether the i.v. or i.p. route of immunization was used, and whether the passive antibody was adsorbed onto the immunizing cells prior to injection, or administered separately. The blocking of the immune response did not depend on simple masking of the antigenic determinants by the passive antibody, since non-saturating amounts of antibody were effective. In addition, blocking activity was dependent on antibody class and on an intact Fc region. The latter considerations also imply that the outcome of passive antibody administration in this system was determined by factors other than the ability of the antigen-antibody complexes to interact directly with B cells, and indicate the importance of antigen processing and/or a mechanism such as antigen-reactive cell opsonization.

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Accession: 041408351

PMID: 2578428

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