Six monoclonal antibodies were prepared that recognize a broadly expressed antigen composed of noncovalently associated 95 kDa and 180 kDa subunits. Antibodies MEM-25, MEM-83 and MEM-95 are shown to react with a determinant(s) present on the isolated larger subunit identified as the CD11a glycoprotein, MEM-48 reacts with the isolated smaller subunit which is identical to the CD18 glycoprotein. Antibodies MEM-30 and MEM-94 recognize probably a determinant in the CD11a/CD18 complex (i.e., LFA-1 antigen) dependent on association of the constituent chains. Cytotoxic activity of NK cells in inhibited by antibodies MEM-25, MEM-95 and less strongly by MEM-30 and MEM-94.
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