A subpopulation of normal human peripheral B lymphcytes that bind IgE

The Journal of Clinical Investigation
A Gonzalez-Molina, H L Spiegelberg

Abstract

Isolated normal human peripheral lymphocytes were analyzed for their ability to bind IgE as shown by rosette formation with aldehydefixed ox red cells coated with an IgE myeloma protein (Eo'-IgE) as indicator cells. An average of 4.3% of the cells in the lymphocyte preparations of 12 donors formed Eo'-IgE rosettes. The lymphocyte preparations contained an average of 0.36% basophils which also formed Eo'-IgE' rosettes, suggestiing that about 4% of the lymphocytes bound IgE. The rosette formation was inhibited by IgE myeloma protiens or IgE Fc fragments but not by IgE Fab fragments or Ig of the other classes. On the average, the lymphocytes of the 12 donors contained 70.5% cells forming spontaneous rosettes with sheep erythrocytes (E), 10.6% cells having surface immunoglobulin (SIg), and 15.5% bunding IgG as shown by rosette formation with IgG-coated ox red cells (EoA). Fractionation of the lymphocytes into populations rich in spontaneously E-rosetting cells and cells with SIg indicated that the majority of the lymphocytes forming Eo'-IgE rosettes belonged to the SIg-positive lymphocytes. Analyses of lymphocyte populations lacking cells forming EoA rosettes and of rosetting with mixed indicator cells both demonstrated that over 9...Continue Reading

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