The Journal of Experimental Medicine
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Journal of Experimental Medicine, Vol 143, 1122-1130, Copyright © 1976 by Rockefeller University Press

ARTICLES

The class of surface immunoglobulin on cells carrying IgG memory in rat thoracic duct lymph: the size of the subpopulation mediating IgG memory

DW Mason

The fluorescence activated cell sorter was used to determine the class of immunoglobulin on the thoracic duct lymphocytes (TDL) which carried IgG memory. Although only about 3% of all TDL carried membrane IgG these cells accounted for most, if not all, of the adoptive IgG anti- DNP response. It is concluded that both CR+ and CR- cells mediating IgG memory in rat TDL bear the same class of membrane immunoglobulin as that secreted by their differentiated progeny. The class of membrane immunoglobulin on CR+ and CR- rat TDL was also examined. It was found that IgM+ cells, which made up over 80% of all Ig+ cells, were virtually all CR+. In contrast, the few percent of IgG+ and IgA+ cells present were to be found in both subpopulations. There was no evidence of a large population of B cells bearing exclusively heavy chains other than IgA, IgG, of IgM. The observation that some IgG+ cells as well as IgM+ cells possess a receptor for C3 appears to rule out the hypothesis that this receptor is involved in blocking a switch from IgM to IgG synthesis.
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