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The CD85 molecule was originally defined at the Fifth Workshop on Leucocyte Antigens in 1993 by two monoclonal antibodies, VMP55 and GHI/75. This cell-surface glycoprotein is expressed on B cells, monocytes, and subpopulations of T and natural killer (NK) cells, and particularly high levels are expressed by normal and neoplastic plasma cells and by hairy cell leukemia B cells. We affinity purified the CD85 antigen and obtained tryptic peptide sequence which indicated that this molecule might be ILT2, a recently described inhibitory major histocompatibility complex class I receptor of the immunoglobulin superfamily. This was confirmed by showing that both of the original anti-CD85 mAbs stained ILT2 transfectants. The cell signaling role demonstrated for ILT2 is consistent with the previously reported involvement of CD85 in T cell activation.

Type

Journal article

Journal

J Leukoc Biol

Publication Date

06/1999

Volume

65

Pages

841 - 845

Keywords

Antibodies, Monoclonal, Antigens, CD, B-Lymphocytes, Humans, Leukocyte Immunoglobulin-like Receptor B1, Receptors, Immunologic, Sequence Homology, Amino Acid