Increased sensitivity of rosetting assay for Fc receptors obtained by using non-hemagglutinating monoclonal antibodies

J Immunol Methods. 1980;34(1):1-10. doi: 10.1016/0022-1759(80)90218-5.


The sensitivity of the conventional EA (Fc) rosetting assay for detecting Fc receptors could be significantly increased by coating sheep erythrocytes (SRBC) with high concentrations of a preparation of homogeneous monoclonal IgG2b anti-SRBC antibodies. This was made possible by virtue of the fact that the monoclonal antibody preparation used was completely incapable of directly hemagglutinating SRBC, although it possessed a high titer as assessed by direct hemolysis or direct hemagglutination. The monoclonal IgG2b- coated SRBC indicator cells were compared to SRBC coated with subhemagglutinating amounts of the IgG fraction of a hemagglutinating rabbit anti-SRBC antiserum: at high coupling concentrations, the monoclonal antibody-coupled SRBC gave consistently higher percentages of Fc rosettes, a large proportion of which were large and multi-layered, when various lymphoid cell populations and a variety of Fc receptor-positive cultured tumor cell line populations were tested. The increased sensitivity of the Fc rosette attained by this method may depend on the nature of the monoclonal anti-SRBC reagent used. Thus, indicator cells prepared by incubation with high concentrations of IgG1 subclass-specific non-hemagglutinating monoclonal anti-SRBC antibodies always gave significantly lower percentages of Fc rosettes than conventionally prepared indicator cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Antibodies*
  • Antibody Formation
  • Clone Cells / immunology
  • Erythrocytes / immunology
  • Goats
  • Hemagglutination Tests
  • Leukemia L1210 / immunology
  • Mice
  • Mice, Inbred DBA
  • Neoplasms, Experimental / immunology*
  • Rabbits
  • Receptors, Fc*
  • Rosette Formation*
  • Sheep


  • Antibodies
  • Receptors, Fc