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The Journal of Immunology, Vol 142, Issue 8 2714-2720, Copyright © 1989 by American Association of Immunologists

ARTICLES

Expression of CD1 and class I MHC antigens by human thymocytes

ML Blue, H Levine, JF Daley, KR Branton Jr and SF Schlossman
Division of Tumor Immunology, Dana Farber Cancer Institute, Boston, MA.

The acquisition of surface class I MHC molecules is associated with the maturation of thymocytes. Here, surface expression of class I MHC and CD1, which represents a family of MHC-related molecules, was analyzed on various human immature and mature thymocyte subpopulations. Class I expression was inversely related to the expression of CD1. The majority of CD4+ CD8+ cortical type thymocytes expressed low levels of class I MHC Ag, the previously described CD4+ CD8+ thymocyte subpopulation with low CD8 expression exhibited intermediate levels of class I MHC, whereas most of the single positive CD4 and CD8 thymocytes displayed high levels of class I MHC. Biochemical comparison of CD1 and class I showed that thymic class I molecules were post-translationally modified by phosphorylation, whereas CD1 was not phosphorylated. Furthermore, our studies suggested that in addition to CD1/CD8 complexes, thymocytes bear CD8/class I complexes. Chemical cross-linking and peptide mapping studies clearly identified the CD8-associated protein on thymic clones as the class I MHC molecule.


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