The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 144, 414-427, Copyright © 1976 by Rockefeller University Press

ARTICLES

Expression of Ia antigens on hapten-specific B cells. I. Delineation of B-cell subpopulations

JL Press, NR Klinman and HO McDevitt

The nonimmune adult spleen contains at least two B-cell subpopulations. The majority of primary B cells express cell surface Ia determinants and have the capacity to give rise to IgG antibody-producing clones after T-cell dependent antigenic stimulation. There is also a small subpopulation of primary B cells which are, by definition, Ia negative, since their activity is not eliminated by negative selection with anti- Ia serum and complement. The Ia-negative B cells give rise to clones that produce only IgM antibody. These B-cell subsets may form a continuum in B-cell maturation, or they may exist as discrete B-cell lineages. Since the cellular expression of Ia antigens appears to correlate with the ability of the B cell to generate IgG-producing clones, it is speculated that Ia molecules may have a role in the IgM to IgG B-cell switch mechanism.
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