Abstract
Natural killer (NK) cells form part of the vertebrate defence against viruses and tumours, but show only limited specificity. The molecule(s) recognized by NK cells on target cells are at present unknown. Major histocompatibility complex (MHC) class I antigen concentration on target cells is inversely correlated with NK cell lysis. Here we show that MHC class I-unassociated beta 2-microglobulin (beta 2-m) expression is involved in NK cell-target cell interaction. Two human MHC class I negative cell lines, Daudi and K562, are differentially susceptible to NK cell lysis. Daudi cells are beta 2-m-negative and resistant to NK lysis, K562 are beta 2-m-positive and highly susceptible to lysis by NK cells. Interferon (IFN) treatment augments beta 2-m expression and NK lysis of K562, but not in Daudi cells. NK cell lysis of K562, but not YAC-1 cells, can be inhibited by monoclonal anti-human beta 2-m antibody. Furthermore, susceptibility of mouse embryo fibroblasts (MEF) to NK lysis can be increased by infection with recombinant vaccinia virus expressing the human beta 2-m gene.
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