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The Journal of Immunology, Vol 137, Issue 10 3240-3246, Copyright © 1986 by American Association of Immunologists
ARTICLES |
G Ortega, PE Korty, EM Shevach and TR Malek
In studies with alloantisera and monoclonal antibodies (mAb) a number of antigenic determinants have been defined that are the products of the Ly-6 locus on murine chromosome 2 and that are expressed primarily on B and T lymphoid cells. It remains controversial whether these antigenic determinants are encoded by a single gene or a multigene complex. We have characterized a new rat mAb, D7, which recognizes a cell surface antigen whose expression on nonactivated peripheral lymphocytes varies from strain to strain. The phenotype of the staining profile, i.e., high or low percentage of D7-positive cells, mapped to the Ly-6 locus as assayed by strain distribution studies, RI lines, and Ly-6 congenic strains. The binding of D7 to Ly-6.1-positive strains could be inhibited by mAb directed to the Ly-6E.1 specificity, whereas D7 could inhibit the binding of mAb specific for Ly-6A.2 to cells from Ly-6.2-positive strains. Coprecipitation studies followed by Western blot analysis confirmed that D7 reacts with both Ly-6E.1- and Ly-6A.2- bearing molecules. The most likely explanation for these findings is that Ly-6A.2 and Ly-6E.1 represent allelic specificities. Further dissection of the complexity of the Ly-6 antigen system and determination of its possible functional importance in lymphocyte activation should be greatly facilitated by the availability of xenogeneic mAb that recognize framework determinants on multiple Ly-6 products.
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