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J. Exp. Med., Volume 186, Number 11, December 1, 1997 1809-1818

A Common Inhibitory Receptor for Major Histocompatibility Complex Class I Molecules on Human Lymphoid and Myelomonocytic Cells

By Marco Colonna,* Francisco Navarro,Dagger Teresa Bellón,Dagger Manuel Llano,Dagger Pilar García,Dagger Jacqueline Samaridis,* Lena Angman,* Marina Cella,* and Miguel López-BotetDagger

From the * Basel Institute for Immunology, Basel CH-4005, Switzerland; and Dagger  Hospital Universitario de la Princesa, 28006 Madrid, Spain

Natural killer (NK) cell-mediated lysis is negatively regulated by killer cell inhibitory receptors specific for major histocompatibility complex (MHC) class I molecules. In this study, we characterize a novel inhibitory MHC class I receptor of the immunoglobulin-superfamily, expressed not only by subsets of NK and T cells, but also by B cells, monocytes, macrophages, and dendritic cells. This receptor, called Ig-like transcript (ILT)2, binds MHC class I molecules and delivers a negative signal that inhibits killing by NK and T cells, as well as Ca2+ mobilization in B cells and myelomonocytic cells triggered through the B cell antigen receptor and human histocompatibility leukocyte antigens (HLA)-DR, respectively. In addition, myelomonocytic cells express receptors homologous to ILT2, which are characterized by extensive polymorphism and might recognize distinct HLA class I molecules. These results suggest that diverse leukocyte lineages have adopted recognition of self-MHC class I molecules as a common strategy to control cellular activation during an immune response.


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