The Journal of Experimental Medicine, Vol 139, 969-982,
Copyright © 1974 by The Rockefeller University Press
EFFECT OF B-CELL MITOGENS ON LYMPHOCYTE SUBPOPULATIONS POSSESSING C'3 AND Fc RECEPTORS
Göran Möller 1
1 From the Division of Immunobiology, Karolinska Institutet, Wallenberglaboratory, Lilla Freskati, 104 05 Stockholm 50, Sweden
By the use of a rosette method allowing the detection at the cellular level of lymphocytes simultaneously binding Fc- and C'3-sensitized red cells it was found that about 70% of the rosette-forming cells from spleens of nude and normal mice possessed receptors for both Fc and C'3, whereas 30% only had Fc receptors. Very few, if any, lymphocytes possessed only C'3 receptors.
The B-cell mitogens, purified-protein derivative of tuberculin (PPD), lipopolysaccharide from Escherichia coli (LPS), and pneumococcal polysaccharide type SIII (SIII), induced marked changes of these receptor-bearing lymphocytes. PPD caused a rapid loss of cells capable of binding C'3 and a concomitant increase of only Fc-binding cells, which was detected after only 24 h. LPS and SIII induced analogous changes, but they were not detected until 48 h and were not complete until after 72 h. It is suggested that immature lymphocytes possess both Fc and C'3 receptors and lose the latter receptor upon differentiation induced by B-cell mitogens PPD. and LPS would affect different populations of B cells, PPD-activating cells that have already reached a higher differentiation stage, whereas LPS and SIII would activate more immature B cells.
Submitted on November 6, 1973
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