The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 150, 517-530, Copyright © 1979 by Rockefeller University Press

ARTICLES

Ability of antigen-specific helper cells to effect a class-restricted increase in total Ig-secreting cells in spleens after immunization with the antigen

YJ Rosenberg and JM Chiller

Immunization with antigens stimulates not only B lymphocytes secreting specific antibody but, in addition, results in the generation of very large numbers of splenic Ig-secreting cells which lack specificity for that antigen. The present report examined the nature of the antigens capable of eliciting this effect and the mechanisms whereby B cells could be nonspecifically activated. It is shown that the ability of T- dependent, but not T-independent antigens, to induce such increases requires the participation of T helper cells specific for the antigen so that any one antigen results in the activation of only a proportion of total B cells. Analysis of this nonspecific plaque-forming-cell response reveals that B cell activation is not random but occurs in a class-restricted manner. The magnitude of the increase and the isotype produced are shown to be characteristic of the immunizing antigen. Based on the data presented, the apparent nonspecific T-B collaboration can best be explained by invoking a second Ig-specific helper mechanism in which helper cells capable of recognizing determinants on Ig molecules, e.g. isotype or idiotype, cause the stimulation of B cells of any specificity providing they express that determinant.
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