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. 1994 Mar 1;179(3):1011–1015. doi: 10.1084/jem.179.3.1011

Ly-49 mediates EL4 lymphoma adhesion to isolated class I major histocompatibility complex molecules

PMCID: PMC2191421  PMID: 8113669

Abstract

Ly-49 is a recently identified cell surface molecule expressed on a subpopulation of natural killer (NK) cells and certain T lymphomas. It has been suggested, based on gene transfection and antibody blocking studies, that Ly-49 is a negative regulator of NK lytic activity, possibly through an interaction with target cell class I molecules. However, it has not been demonstrated that class I molecules indeed serve as ligands for Ly-49. We have found that T lymphomas expressing Ly-49 bind isolated class I major histocompatibility complex (MHC) molecules but not class II molecules immobilized on plastic. Adhesion to class I molecules was not found with T lymphomas lacking Ly-49 expression. The Ly-49 expressing EL4 lymphoma bound Dd, Dk, and Kb, but not Kd, Kk, or Db, thus demonstrating a restricted pattern of class I adhesion. The observed cell adhesion was class I density dependent, and binding to Dd and Dk was extensively inhibited by the A1 monoclonal antibody directed against Ly-49. These results provide direct evidence for Ly-49 serving as a receptor for a subset of class I MHC molecules.

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Selected References

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