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A Receptor for IgA on Human T Lymphocytes

From the Metabolism Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20014, and Walter Reed Army Research Institute, Walter Reed Medical Center, Washington, D. C. 20012

Abstract

Receptors for IgA antibody-antigen complexes were demonstrated on 2 to 18% (mean 6.7%) of human peripheral blood T cells. The proportion of cells bearing detectable IgA receptors was low in freshly prepared T cells and increased in number after 18 to 24 hr of culture similar to the time course of appearance of the T_µ receptor. These T receptors were shown to be distinctly different from Fc-IgM and Fc-IgG receptors on T cells by blocking studies with purified IgA, IgG, and IgM.

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