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The Journal of Immunology, Vol 132, Issue 4 1712-1716, Copyright © 1984 by American Association of Immunologists

ARTICLES

mIgM:mIgD ratios on B cells: mean mIgD expression exceeds mIgM by 10- fold on most splenic B cells

WL Havran, DL DiGiusto and JC Cambier

The relative frequency of mIgM and mIgD molecules on B cell surfaces is important in determining, in large part, the isotype involvement in antigen binding and signal transduction. Although it is generally assumed that on most mature B cells, mIgM and mIgD occur in roughly equal quantities, no formal analysis of this question has been reported. In this report, we describe such an analysis based on the quantitation of anti-Fab or anti-kappa specific immunofluorescence of splenic B cells before or after capping with rabbit anti-IgD or anti- IgM antibodies or both. The results indicate that, whereas mean expression of IgD exceeds IgM on splenocytes by threefold, members of the major B cell subpopulation (60 to 70% of cells) express 10-fold more IgD than IgM.


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